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全球速看：记一次 rr 和硬件断点解决内存踩踏问题
在日常的调试过程中，我们总会遇到一些有趣的 bug，在本文我就遇到了一个有意思的查询结果不一致问题。
故事的开始
我们在测试 NebulaGraph 的 MATCH语句的时候发现一个很神奇的事情：
(资料图片仅供参考)
(root@nebula) [gdlancer]> match (v1)-[e*1..1]->(v2) where id(v1) in [1, 2, 3, 4] and (v2)-[e*1..1]->(v1) return e;+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+| e |+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+| [[:Rel_5 2->2 @0 {Rel_5_0_Bool: true, Rel_5_1_Bool: true, Rel_5_2_Double: 0.533698, Rel_5_3_String: "Stephen Curry", Rel_5_4_Double: 0.162998}]] || [[:Rel_1 2->2 @0 {Rel_1_0_Int: 3, Rel_1_1_Int: 5, Rel_1_2_Int: 81, Rel_1_3_Double: 0.975062, Rel_1_4_Bool: true, Rel_1_5_Int: 59}]] || [[:Rel_0 2->2 @0 {Rel_0_0_Bool: true, Rel_0_1_String: "Kevin Durant", Rel_0_2_String: "Joel Embiid", Rel_0_3_Int: 96, Rel_0_4_Double: 0.468568, Rel_0_5_Int: 98, Rel_0_6_Int: 77}]] || [[:Rel_2 2->2 @0 {Rel_2_0_Int: 38, Rel_2_1_Double: 0.120953, Rel_2_2_String: "Null1", Rel_2_3_Bool: false, Rel_2_4_Bool: true, Rel_2_5_Int: 6, Rel_2_6_String: "Tracy McGrady"}]] || [[:Rel_3 2->2 @0 {Rel_3_0_String: "Aron Baynes", Rel_3_1_String: "LeBron James", Rel_3_2_Double: 0.831096, Rel_3_3_Int: 11}]] || [[:Rel_4 2->2 @0 {Rel_4_0_Bool: true, Rel_4_1_String: "Kevin Durant", Rel_4_2_Double: 0.71757, Rel_4_3_String: "Marc Gasol", Rel_4_4_Double: 0.285247, Rel_4_5_String: "Cory Joseph"}]] |+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+Got 6 rows (time spent 146.7ms/168.31625ms)Tue, 03 Jan 2023 14:10:03 CST(root@nebula) [gdlancer]> match (v1)-[e*1..1]->(v2) where id(v1) in [1, 2, 3, 4] and (v2)-[e*1..1]->(v1) return e;+---+| e |+---++---+Empty set (time spent 30.67ms/58.220042ms)Tue, 03 Jan 2023 14:10:05 CST同样的语句，两次查询的结果集居然不一样！
开始 Debug
profile 出问题的语句：
(root@nebula) [gdlancer]> profile match (v1)-[e*1..1]->(v2) where id(v1) in [1, 2, 3, 4] and (v2)-[e*1..1]->(v1) return e;+---+| e |+---++---+Empty set (time spent 18.755ms/79.84375ms)Execution Plan (optimize time 1656 us)-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------| id | name | dependencies | profiling data | operator info |-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------| 12 | Project | 11 | ver: 0, rows: 0, execTime: 17us, totalTime: 19us | outputVar: { || | | | | "colNames": [ || | | | | "e" || | | | | ], || | | | | "type": "DATASET", || | | | | "name": "__Project_12" || | | | | } || | | | | inputVar: __Filter_11 || | | | | columns: [ || | | | | "$e" || | | | | ] |-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------| 11 | Filter | 10 | ver: 0, rows: 0, execTime: 26us, totalTime: 29us | outputVar: { || | | | | "colNames": [ || | | | | "v1", || | | | | "e", || | | | | "v2" || | | | | ], || | | | | "type": "DATASET", || | | | | "name": "__Filter_11" || | | | | } || | | | | inputVar: __PatternApply_10 || | | | | condition: ((id($v1)==1) OR (id($v1)==2) OR (id($v1)==3) OR (id($v1)==4)) || | | | | isStable: false |-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------| 10 | PatternApply | 6,9 | ver: 0, rows: 0, execTime: 84us, totalTime: 87us | outputVar: { || | | | | "colNames": [ || | | | | "v1", || | | | | "e", || | | | | "v2" || | | | | ], || | | | | "type": "DATASET", || | | | | "name": "__PatternApply_10" || | | | | } || | | | | inputVar: { || | | | | "rightVar": "__AppendVertices_9", || | | | | "leftVar": "__Project_6" || | | | | } || | | | | keyCols: [ || | | | | "id($-.v2)", || | | | | "id($-.v1)" || | | | | ] |-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------| 6 | Project | 5 | ver: 0, rows: 18, execTime: 103us, totalTime: 106us | outputVar: { || | | | | "colNames": [ || | | | | "v1", || | | | | "e", || | | | | "v2" || | | | | ], || | | | | "name": "__Project_6", || | | | | "type": "DATASET" || | | | | } || | | | | inputVar: __AppendVertices_5 || | | | | columns: [ || | | | | "$-.v1 AS v1", || | | | | "[__VAR_2 IN $-.e WHERE is_edge($__VAR_2)] AS e", || | | | | "$-.v2 AS v2" || | | | | ] |-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------| 5 | AppendVertices | 4 | { | outputVar: { || | | | ver: 0, rows: 18, execTime: 438us, totalTime: 1613us | "colNames": [ || | | | resp[2]: { | "v1", || | | | "exec": "308(us)", | "e", || | | | "host": "store1:9779", | "v2" || | | | "total": "1114(us)" | ], || | | | } | "name": "__AppendVertices_5", || | | | total_rpc: 1350(us) | "type": "DATASET" || | | | resp[0]: { | } || | | | "exec": "356(us)", | inputVar: __Traverse_4 || | | | "host": "store3:9779", | space: 8 || | | | "total": "1248(us)" | dedup: true || | | | } | limit: -1 || | | | resp[1]: { | filter: || | | | "exec": "323(us)", | orderBy: [] || | | | "host": "store2:9779", | src: none_direct_dst($-.e) || | | | "total": "966(us)" | props: [ || | | | } | { || | | | } | "tagId": 13, || | | | | "props": [ || | | | | "_tag" || | | | | ] || | | | | }, || | | | | { || | | | | "tagId": 12, || | | | | "props": [ || | | | | "_tag" || | | | | ] || | | | | }, || | | | | { || | | | | "props": [ || | | | | "_tag" || | | | | ], || | | | | "tagId": 11 || | | | | }, || | | | | { || | | | | "tagId": 9, || | | | | "props": [ || | | | | "_tag" || | | | | ] || | | | | }, || | | | | { || | | | | "tagId": 10, || | | | | "props": [ || | | | | "_tag" || | | | | ] || | | | | }, || | | | | { || | | | | "props": [ || | | | | "_tag" || | | | | ], || | | | | "tagId": 14 || | | | | }, || | | | | { || | | | | "props": [ || | | | | "_tag" || | | | | ], || | | | | "tagId": 15 || | | | | } || | | | | ] || | | | | exprs: || | | | | vertex_filter: || | | | | if_track_previous_path: true |-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------| 4 | Traverse | 2 | { | outputVar: { || | | | ver: 0, rows: 18, execTime: 597us, totalTime: 2943us | "colNames": [ || | | | step[1]: [ | "v1", || | | | { | "e" || | | | "exec": "811(us)", | ], || | | | "host": "store2:9779", | "name": "__Traverse_4", || | | | "storage_detail": { | "type": "DATASET" || | | | "GetNeighborsNode": "551(us)", | } || | | | "HashJoinNode": "415(us)", | inputVar: __Dedup_2 || | | | "RelNode": "551(us)", | space: 8 || | | | "SingleEdgeNode": "391(us)" | dedup: true || | | | }, | limit: -1 || | | | "total": "2139(us)", | filter: || | | | "total_rpc_time": "2328(us)", | orderBy: [] || | | | "vertices": 2 | src: $-._vid || | | | }, | edgeTypes: [] || | | | { | edgeDirection: OUT_EDGE || | | | "exec": "769(us)", | vertexProps: || | | | "host": "store1:9779", | edgeProps: [ || | | | "storage_detail": { | { || | | | "GetNeighborsNode": "259(us)", | "type": 21, || | | | "HashJoinNode": "177(us)", | "props": [ || | | | "RelNode": "259(us)", | "_src", || | | | "SingleEdgeNode": "161(us)" | "_type", || | | | }, | "_rank", || | | | "total": "1938(us)", | "_dst", || | | | "total_rpc_time": "2328(us)", | "Rel_5_0_Bool", || | | | "vertices": 1 | "Rel_5_1_Bool", || | | | }, | "Rel_5_4_Double", || | | | { | "Rel_5_3_String", || | | | "exec": "699(us)", | "Rel_5_2_Double" || | | | "host": "store6:9779", | ] || | | | "storage_detail": { | }, || | | | "GetNeighborsNode": "161(us)", | { || | | | "HashJoinNode": "152(us)", | "props": [ || | | | "RelNode": "162(us)", | "_src", || | | | "SingleEdgeNode": "142(us)" | "_type", || | | | }, | "_rank", || | | | "total": "1735(us)", | "_dst", || | | | "total_rpc_time": "2328(us)", | "Rel_1_0_Int", || | | | "vertices": 1 | "Rel_1_3_Double", || | | | } | "Rel_1_2_Int", || | | | ] | "Rel_1_4_Bool", || | | | } | "Rel_1_5_Int", || | | | | "Rel_1_1_Int" || | | | | ], || | | | | "type": 17 || | | | | }, || | | | | { || | | | | "type": 16, || | | | | "props": [ || | | | | "_src", || | | | | "_type", || | | | | "_rank", || | | | | "_dst", || | | | | "Rel_0_6_Int", || | | | | "Rel_0_0_Bool", || | | | | "Rel_0_3_Int", || | | | | "Rel_0_2_String", || | | | | "Rel_0_4_Double", || | | | | "Rel_0_1_String", || | | | | "Rel_0_5_Int" || | | | | ] || | | | | }, || | | | | { || | | | | "type": 18, || | | | | "props": [ || | | | | "_src", || | | | | "_type", || | | | | "_rank", || | | | | "_dst", || | | | | "Rel_2_3_Bool", || | | | | "Rel_2_1_Double", || | | | | "Rel_2_4_Bool", || | | | | "Rel_2_5_Int", || | | | | "Rel_2_2_String", || | | | | "Rel_2_6_String", || | | | | "Rel_2_0_Int" || | | | | ] || | | | | }, || | | | | { || | | | | "type": 19, || | | | | "props": [ || | | | | "_src", || | | | | "_type", || | | | | "_rank", || | | | | "_dst", || | | | | "Rel_3_0_String", || | | | | "Rel_3_3_Int", || | | | | "Rel_3_1_String", || | | | | "Rel_3_2_Double" || | | | | ] || | | | | }, || | | | | { || | | | | "props": [ || | | | | "_src", || | | | | "_type", || | | | | "_rank", || | | | | "_dst", || | | | | "Rel_4_0_Bool", || | | | | "Rel_4_2_Double", || | | | | "Rel_4_5_String", || | | | | "Rel_4_1_String", || | | | | "Rel_4_4_Double", || | | | | "Rel_4_3_String" || | | | | ], || | | | | "type": 20 || | | | | } || | | | | ] || | | | | statProps: || | | | | exprs: || | | | | random: false || | | | | steps: 1..1 || | | | | vertex filter: || | | | | edge filter: || | | | | if_track_previous_path: false || | | | | first step filter: || | | | | tag filter: |-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------| 2 | Dedup | 1 | ver: 0, rows: 4, execTime: 16us, totalTime: 18us | outputVar: { || | | | | "colNames": [ || | | | | "_vid" || | | | | ], || | | | | "type": "DATASET", || | | | | "name": "__Dedup_2" || | | | | } || | | | | inputVar: __VAR_1 |-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------| 1 | PassThrough | 3 | ver: 0, rows: 0, execTime: 14us, totalTime: 19us | outputVar: { || | | | | "colNames": [ || | | | | "_vid" || | | | | ], || | | | | "type": "DATASET", || | | | | "name": "__VAR_1" || | | | | } || | | | | inputVar: |-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------| 3 | Start | | ver: 0, rows: 0, execTime: 2us, totalTime: 29us | outputVar: { || | | | | "colNames": [], || | | | | "type": "DATASET", || | | | | "name": "__Start_3" || | | | | } |-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------| 9 | AppendVertices | 8 | ver: 0, rows: 0, execTime: 46us, totalTime: 50us | outputVar: { || | | | | "colNames": [ || | | | | "v2", || | | | | "e", || | | | | "v1" || | | | | ], || | | | | "type": "DATASET", || | | | | "name": "__AppendVertices_9" || | | | | } || | | | | inputVar: __Traverse_8 || | | | | space: 8 || | | | | dedup: true || | | | | limit: -1 || | | | | filter: || | | | | orderBy: [] || | | | | src: none_direct_dst($-.e) || | | | | props: [ || | | | | { || | | | | "props": [ || | | | | "_tag" || | | | | ], || | | | | "tagId": 13 || | | | | }, || | | | | { || | | | | "props": [ || | | | | "_tag" || | | | | ], || | | | | "tagId": 12 || | | | | }, || | | | | { || | | | | "tagId": 11, || | | | | "props": [ || | | | | "_tag" || | | | | ] || | | | | }, || | | | | { || | | | | "tagId": 9, || | | | | "props": [ || | | | | "_tag" || | | | | ] || | | | | }, || | | | | { || | | | | "tagId": 10, || | | | | "props": [ || | | | | "_tag" || | | | | ] || | | | | }, || | | | | { || | | | | "tagId": 14, || | | | | "props": [ || | | | | "_tag" || | | | | ] || | | | | }, || | | | | { || | | | | "tagId": 15, || | | | | "props": [ || | | | | "_tag" || | | | | ] || | | | | } || | | | | ] || | | | | exprs: || | | | | vertex_filter: || | | | | if_track_previous_path: true |-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------| 8 | Traverse | 7 | { | outputVar: { || | | | ver: 0, rows: 0, execTime: 4867us, totalTime: 9173us | "colNames": [ || | | | step[2]: [ | "v2", || | | | { | "e" || | | | "exec": "488(us)", | ], || | | | "host": "store2:9779", | "type": "DATASET", || | | | "storage_detail": { | "name": "__Traverse_8" || | | | "GetNeighborsNode": "371(us)", | } || | | | "HashJoinNode": "261(us)", | inputVar: __Argument_7 || | | | "RelNode": "371(us)", | space: 8 || | | | "SingleEdgeNode": "243(us)" | dedup: true || | | | }, | limit: -1 || | | | "total": "1509(us)", | filter: || | | | "total_rpc_time": "1948(us)", | orderBy: [] || | | | "vertices": 2 | src: id($-.v2) || | | | }, | edgeTypes: [] || | | | { | edgeDirection: OUT_EDGE || | | | "exec": "331(us)", | vertexProps: || | | | "host": "store3:9779", | edgeProps: [ || | | | "storage_detail": { | { || | | | "GetNeighborsNode": "86(us)", | "type": 21, || | | | "HashJoinNode": "63(us)", | "props": [ || | | | "RelNode": "86(us)", | "_src", || | | | "SingleEdgeNode": "54(us)" | "_type", || | | | }, | "_rank", || | | | "total": "1208(us)", | "_dst", || | | | "total_rpc_time": "1948(us)", | "Rel_5_0_Bool", || | | | "vertices": 1 | "Rel_5_1_Bool", || | | | }, | "Rel_5_4_Double", || | | | { | "Rel_5_3_String", || | | | "exec": "686(us)", | "Rel_5_2_Double" || | | | "host": "store5:9779", | ] || | | | "storage_detail": { | }, || | | | "GetNeighborsNode": "311(us)", | { || | | | "HashJoinNode": "254(us)", | "props": [ || | | | "RelNode": "311(us)", | "_src", || | | | "SingleEdgeNode": "237(us)" | "_type", || | | | }, | "_rank", || | | | "total": "1532(us)", | "_dst", || | | | "total_rpc_time": "1948(us)", | "Rel_1_0_Int", || | | | "vertices": 2 | "Rel_1_3_Double", || | | | }, | "Rel_1_2_Int", || | | | { | "Rel_1_4_Bool", || | | | "exec": "467(us)", | "Rel_1_5_Int", || | | | "host": "store6:9779", | "Rel_1_1_Int" || | | | "storage_detail": { | ], || | | | "GetNeighborsNode": "173(us)", | "type": 17 || | | | "HashJoinNode": "124(us)", | }, || | | | "RelNode": "173(us)", | { || | | | "SingleEdgeNode": "115(us)" | "type": 16, || | | | }, | "props": [ || | | | "total": "1368(us)", | "_src", || | | | "total_rpc_time": "1948(us)", | "_type", || | | | "vertices": 1 | "_rank", || | | | }, | "_dst", || | | | { | "Rel_0_6_Int", || | | | "exec": "494(us)", | "Rel_0_0_Bool", || | | | "host": "store1:9779", | "Rel_0_3_Int", || | | | "storage_detail": { | "Rel_0_2_String", || | | | "GetNeighborsNode": "238(us)", | "Rel_0_4_Double", || | | | "HashJoinNode": "147(us)", | "Rel_0_1_String", || | | | "RelNode": "239(us)", | "Rel_0_5_Int" || | | | "SingleEdgeNode": "137(us)" | ] || | | | }, | }, || | | | "total": "1246(us)", | { || | | | "total_rpc_time": "1948(us)", | "type": 18, || | | | "vertices": 1 | "props": [ || | | | } | "_src", || | | | ] | "_type", || | | | step[3]: [ | "_rank", || | | | { | "_dst", || | | | "exec": "643(us)", | "Rel_2_3_Bool", || | | | "host": "store5:9779", | "Rel_2_1_Double", || | | | "storage_detail": { | "Rel_2_4_Bool", || | | | "GetNeighborsNode": "432(us)", | "Rel_2_5_Int", || | | | "HashJoinNode": "296(us)", | "Rel_2_2_String", || | | | "RelNode": "433(us)", | "Rel_2_6_String", || | | | "SingleEdgeNode": "272(us)" | "Rel_2_0_Int" || | | | }, | ] || | | | "total": "1556(us)", | }, || | | | "total_rpc_time": "1913(us)", | { || | | | "vertices": 3 | "type": 19, || | | | }, | "props": [ || | | | { | "_src", || | | | "exec": "581(us)", | "_type", || | | | "host": "store6:9779", | "_rank", || | | | "storage_detail": { | "_dst", || | | | "GetNeighborsNode": "255(us)", | "Rel_3_0_String", || | | | "HashJoinNode": "162(us)", | "Rel_3_3_Int", || | | | "RelNode": "256(us)", | "Rel_3_1_String", || | | | "SingleEdgeNode": "151(us)" | "Rel_3_2_Double" || | | | }, | ] || | | | "total": "1612(us)", | }, || | | | "total_rpc_time": "1913(us)", | { || | | | "vertices": 1 | "type": 20, || | | | }, | "props": [ || | | | { | "_src", || | | | "exec": "373(us)", | "_type", || | | | "host": "store2:9779", | "_rank", || | | | "storage_detail": { | "_dst", || | | | "GetNeighborsNode": "124(us)", | "Rel_4_0_Bool", || | | | "HashJoinNode": "93(us)", | "Rel_4_2_Double", || | | | "RelNode": "124(us)", | "Rel_4_5_String", || | | | "SingleEdgeNode": "84(us)" | "Rel_4_1_String", || | | | }, | "Rel_4_4_Double", || | | | "total": "1285(us)", | "Rel_4_3_String" || | | | "total_rpc_time": "1913(us)", | ] || | | | "vertices": 1 | } || | | | }, | ] || | | | { | statProps: || | | | "exec": "502(us)", | exprs: || | | | "host": "store7:9779", | random: false || | | | "storage_detail": { | steps: 4..3 || | | | "GetNeighborsNode": "157(us)", | vertex filter: || | | | "HashJoinNode": "132(us)", | edge filter: || | | | "RelNode": "157(us)", | if_track_previous_path: false || | | | "SingleEdgeNode": "123(us)" | first step filter: || | | | }, | tag filter: || | | | "total": "1295(us)", | || | | | "total_rpc_time": "1913(us)", | || | | | "vertices": 1 | || | | | } | || | | | ] | || | | | step[1]: [ | || | | | { | || | | | "exec": "522(us)", | || | | | "host": "store3:9779", | || | | | "storage_detail": { | || | | | "GetNeighborsNode": "361(us)", | || | | | "HashJoinNode": "272(us)", | || | | | "RelNode": "361(us)", | || | | | "SingleEdgeNode": "253(us)" | || | | | }, | || | | | "total": "1534(us)", | || | | | "total_rpc_time": "1702(us)", | || | | | "vertices": 2 | || | | | }, | || | | | { | || | | | "exec": "445(us)", | || | | | "host": "store2:9779", | || | | | "storage_detail": { | || | | | "GetNeighborsNode": "185(us)", | || | | | "HashJoinNode": "77(us)", | || | | | "RelNode": "185(us)", | || | | | "SingleEdgeNode": "69(us)" | || | | | }, | || | | | "total": "1296(us)", | || | | | "total_rpc_time": "1702(us)", | || | | | "vertices": 1 | || | | | }, | || | | | { | || | | | "exec": "529(us)", | || | | | "host": "store1:9779", | || | | | "storage_detail": { | || | | | "GetNeighborsNode": "245(us)", | || | | | "HashJoinNode": "155(us)", | || | | | "RelNode": "245(us)", | || | | | "SingleEdgeNode": "146(us)" | || | | | }, | || | | | "total": "1276(us)", | || | | | "total_rpc_time": "1702(us)", | || | | | "vertices": 1 | || | | | } | || | | | ] | || | | | } | |-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------| 7 | Argument | | ver: 0, rows: 4, execTime: 0us, totalTime: 55us | outputVar: { || | | | | "colNames": [ || | | | | "v2" || | | | | ], || | | | | "type": "DATASET", || | | | | "name": "__Argument_7" || | | | | } || | | | | inputVar: __Project_6 |-----+----------------+--------------+------------------------------------------------------+----------------------------------------------------------------------------Tue, 03 Jan 2023 15:54:06 CST我们发现执行计划中编号 8 的节点对应的 step range 明显是错的：steps: 4..3（结合语句中的 e*1..1，正确值应该是 1..1）。
下面，我们通过 rr 录下一次错误的执行过程，然后在设置 MatchStepRange的地方（src/graph/planner/match/MatchPathPlanner.cpp:282）下断点：
[New Thread 34.61][Switching to Thread 34.47]Thread 3 hit Breakpoint 3, nebula::graph::MatchPathPlanner::rightExpandFromNode (this=0x18e60dc5c58, startIndex=0, subplan=...) at /data/src/nebula-comm/src/graph/planner/match/MatchPathPlanner.cpp:282282 traverse->setStepRange(edge.range);(rr) bt#0 nebula::graph::MatchPathPlanner::rightExpandFromNode (this=0x18e60dc5c58, startIndex=0, subplan=...) at /data/src/nebula-comm/src/graph/planner/match/MatchPathPlanner.cpp:282#1 0x00000000033198dd in nebula::graph::MatchPathPlanner::expandFromNode (this=0x18e60dc5c58, startIndex=0, subplan=...) at /data/src/nebula-comm/src/graph/planner/match/MatchPathPlanner.cpp:169#2 0x000000000331937b in nebula::graph::MatchPathPlanner::expand (this=0x18e60dc5c58, startFromEdge=false, startIndex=0, subplan=...) at /data/src/nebula-comm/src/graph/planner/match/MatchPathPlanner.cpp:158#3 0x00000000033185ca in nebula::graph::MatchPathPlanner::transform (this=0x18e60dc5c58, bindWhere=0x69433b909880, nodeAliasesSeen=...) at /data/src/nebula-comm/src/graph/planner/match/MatchPathPlanner.cpp:78#4 0x0000000003305b16 in nebula::graph::MatchClausePlanner::transform (this=0x69433bbd64b0, clauseCtx=0x7f25a94881c0) at /data/src/nebula-comm/src/graph/planner/match/MatchClausePlanner.cpp:33#5 0x0000000003302a11 in nebula::graph::MatchPlanner::genPlan (this=0x69433b9998b0, clauseCtx=0x7f25a94881c0) at /data/src/nebula-comm/src/graph/planner/match/MatchPlanner.cpp:42#6 0x0000000003303030 in nebula::graph::MatchPlanner::connectMatchPlan (this=0x69433b9998b0, queryPlan=..., matchCtx=0x7f25a94881c0) at /data/src/nebula-comm/src/graph/planner/match/MatchPlanner.cpp:63#7 0x0000000003302101 in nebula::graph::MatchPlanner::genQueryPartPlan (this=0x69433b9998b0, qctx=0x7f25a94672a0, queryPlan=..., queryPart=...) at /data/src/nebula-comm/src/graph/planner/match/MatchPlanner.cpp:137#8 0x0000000003301e84 in nebula::graph::MatchPlanner::transform (this=0x69433b9998b0, astCtx=0x7f25a95eb700) at /data/src/nebula-comm/src/graph/planner/match/MatchPlanner.cpp:33#9 0x00000000032e40b1 in nebula::graph::Planner::toPlan (astCtx=0x7f25a95eb700) at /data/src/nebula-comm/src/graph/planner/Planner.cpp:38#10 0x00000000030d6b7e in nebula::graph::Validator::toPlan (this=0x69433bbd0f80) at /data/src/nebula-comm/src/graph/validator/Validator.cpp:401#11 0x00000000030d5b93 in nebula::graph::Validator::validate (this=0x69433bbd0f80) at /data/src/nebula-comm/src/graph/validator/Validator.cpp:364#12 0x0000000003114880 in nebula::graph::SequentialValidator::validateImpl (this=0x69433bbd0c00) at /data/src/nebula-comm/src/graph/validator/SequentialValidator.cpp:40#13 0x00000000030d58e7 in nebula::graph::Validator::validate (this=0x69433bbd0c00) at /data/src/nebula-comm/src/graph/validator/Validator.cpp:354#14 0x00000000030d4c8f in nebula::graph::Validator::validate (sentence=0x69433bc58870, qctx=0x7f25a94672a0) at /data/src/nebula-comm/src/graph/validator/Validator.cpp:285#15 0x0000000002ff4841 in nebula::graph::QueryInstance::validateAndOptimize (this=0x69433bc07640) at /data/src/nebula-comm/src/graph/service/QueryInstance.cpp:102#16 0x0000000002ff3920 in nebula::graph::QueryInstance::execute (this=0x69433bc07640) at /data/src/nebula-comm/src/graph/service/QueryInstance.cpp:42#17 0x0000000002fe9219 in nebula::graph::QueryEngine::execute (this=0x69433bc603c0, rctx=...) at /data/src/nebula-comm/src/graph/service/QueryEngine.cpp:57#18 0x0000000002f6145f in nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1::operator()(nebula::StatusOr >) (this=0x7f25a9452460, ret=...) at /data/src/nebula-comm/src/graph/service/GraphService.cpp:183#19 0x0000000002f60626 in folly::futures::detail::wrapInvoke >, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(folly::Try > >&&, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&)::{lambda()#1}::operator()() const (this=0x18e60dc8120) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:98#20 0x0000000002f605bf in folly::futures::detail::InvokeResultWrapper::wrapResult >, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(folly::Try > >&&, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&)::{lambda()#1}>(folly::futures::detail::wrapInvoke >, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(folly::Try > >&&, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&)::{lambda()#1}) (fn=...) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:90#21 0x0000000002f6057c in folly::futures::detail::wrapInvoke >, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(folly::Try > >&&, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&) ( t=..., f=...) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:108#22 0x0000000002f604cf in folly::Future > >::thenValue, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&) &&::{lambda(folly::Executor::KeepAlive&&, folly::Try > >&&)#1}::operator()(folly::Executor::KeepAlive&&, folly::Try > >&&) (this=0x7f25a9452460, t=...) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:991#23 0x0000000002f6046e in folly::futures::detail::CoreCallbackState > >::thenValue, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&) &&::{lambda(folly::Executor::KeepAlive&&, folly::Try > >&&)#1}>::invoke, folly::Try > > >(folly::Executor::KeepAlive&&, folly::Try > >&&) (this=0x7f25a9452460, args=..., args=...) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:144#24 0x0000000002f603cb in folly::futures::detail::detail_msvc_15_7_workaround::invoke >, folly::Future > >::thenValue, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::alloc--Type for more, q to quit, c to continue without paging--qQuit(rr) p edge.range$1 = (nebula::MatchStepRange *) 0x69433b948320(rr) p *edge.range$2 = {min_ = 1, max_ = 1}(rr) cContinuing.Thread 3 hit Breakpoint 3, nebula::graph::MatchPathPlanner::rightExpandFromNode (this=0x18e60dc61f8, startIndex=0, subplan=...) at /data/src/nebula-comm/src/graph/planner/match/MatchPathPlanner.cpp:282282 traverse->setStepRange(edge.range);(rr) p edge.range$3 = (nebula::MatchStepRange *) 0x69433b9998a0(rr) p *edge.range$4 = {min_ = 4, max_ = 3}(rr) p &edge.range->min_$5 = (size_t *) 0x69433b9998a0 (rr) watch *((size_t *) 0x69433b9998a0)Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)(rr) 我们发现第二次设置的 MatchStepRange(4..3)显然已经出错。
我们在 &edge.range→min_这个地址（0x69433b9998a0）下个硬件断点，重新运行程序。
我们观察到 0x69433b9998a0 这个地址一直被反复的释放直到它被分配给一个 MatchStepRange对象：
0x0000000003319f1d 282 traverse->setStepRange(edge.range);The program being debugged has been started already.Start it from the beginning? (y or n) yStarting program: /root/src/nebula-comm/build-debug/bin/nebula-graphdProgram stopped.0x00007f25a9200100 in ?? () from /lib64/ld-linux-x86-64.so.2(rr) cContinuing.[New Thread 34.39][New Thread 34.35][New Thread 34.36][New Thread 34.37][New Thread 34.38][Switching to Thread 34.39]Thread 2 hit Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)Old value = New value = 00x0000000070000002 in syscall_traced ()(rr) cContinuing.[New Thread 34.56][New Thread 34.57][New Thread 34.40][New Thread 34.41][New Thread 34.42][New Thread 34.43][New Thread 34.44][New Thread 34.45][New Thread 34.46][New Thread 34.47][New Thread 34.48][New Thread 34.49][New Thread 34.50][New Thread 34.51][New Thread 34.52][New Thread 34.53][New Thread 34.54][New Thread 34.55][New Thread 34.58][New Thread 34.59][New Thread 34.60][New Thread 34.61][Switching to Thread 34.57]Thread 8 hit Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)Old value = 0New value = 128849018911__memmove_avx_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:315315 ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S: No such file or directory.(rr) cContinuing.Thread 8 hit Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)Old value = 128849018911New value = 0__memset_avx2_unaligned_erms () at ../sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S:260260 ../sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S: No such file or directory.(rr)Continuing.Thread 8 hit Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)Old value = 0New value = 139799731034544std::_Hashtable, std::allocator >, std::pair, std::allocator > const, long>, std::allocator, std::allocator > const, long> >, std::__detail::_Select1st, std::equal_to, std::allocator > >, std::hash, std::allocator > >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits >::_M_insert_bucket_begin (this=0x7f25a94ed9a0, __bkt=0, __node=0x7f25a94e1a80) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/hashtable.h:16191619 {(rr)Continuing.Thread 8 hit Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)Old value = 139799731034544New value = 0__memset_avx2_unaligned_erms () at ../sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S:260260 ../sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S: No such file or directory.(rr)Continuing.Thread 8 hit Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)Old value = 0New value = 89457155694696std::_Hashtable, std::allocator > > >, std::allocator, std::allocator > > > >, std::__detail::_Select1st, std::equal_to, std::hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits >::_M_insert_bucket_begin (this=0x515c5dfce058, __bkt=0, __node=0x69433bc58e70) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/hashtable.h:16191619 {(rr)Continuing.Thread 8 hit Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)Old value = 89457155694696New value = 1157374833350240x0000000004066efa in std::_Hashtable, std::allocator > > >, std::allocator, std::allocator > > > >, std::__detail::_Select1st, std::equal_to, std::hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits >::_M_insert_bucket_begin (this=0x515c5dfce058, __bkt=1, __node=0x69433b94d570) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/hashtable.h:16161616 _H1, _H2, _Hash, _RehashPolicy, _Traits>::(rr)Continuing.Thread 8 hit Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)Old value = 115737483335024New value = 00x0000000003153d10 in std::__shared_ptr::__shared_ptr (this=0x69433b9998a0) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/shared_ptr_base.h:11191119 : _M_ptr(0), _M_refcount()(rr)Continuing.Thread 8 hit Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)Old value = 0New value = 139799732183408std::swap (__a=@0x515c5dfcd878: 0x0, __b=@0x69433b9998a0: 0x7f25a9606170) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/move.h:196196 }(rr)Continuing.Thread 8 hit Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)Old value = 139799732183408New value = 0__memset_avx2_unaligned_erms () at ../sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S:260260 ../sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S: No such file or directory.(rr)Continuing.[Switching to Thread 34.47]Thread 16 hit Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)Old value = 0New value = 98202129293344__memmove_avx_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:315315 ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S: No such file or directory.(rr)Continuing.Thread 16 hit Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)Old value = 98202129293344New value = 10x00000000031e675d in std::make_unique (__args=...) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/unique_ptr.h:857857 { return unique_ptr<_Tp>(new _Tp(std::forward<_Args>(__args)...)); }(rr) bt#0 0x00000000031e675d in std::make_unique (__args=...) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/unique_ptr.h:857#1 0x00000000031e586a in nebula::MatchEdge::clone (this=0x69433b919530) at /data/src/nebula-comm/src/parser/MatchPath.h:128#2 0x00000000031e082d in nebula::MatchPath::clone (this=0x7f25a94d3b00) at /data/src/nebula-comm/src/parser/MatchPath.h:363#3 0x00000000031e0161 in nebula::graph::extractSinglePathPredicate (expr=0x595077086880, pathPreds=...) at /data/src/nebula-comm/src/graph/validator/MatchValidator.cpp:1122#4 0x00000000031e0b43 in nebula::graph::extractMultiPathPredicate (expr=0x595077085e60, pathPreds=...) at /data/src/nebula-comm/src/graph/validator/MatchValidator.cpp:1158#5 0x00000000031d87aa in nebula::graph::MatchValidator::validatePathInWhere (this=0x69433bbd0f80, wctx=..., availableAliases=..., paths=...) at /data/src/nebula-comm/src/graph/validator/MatchValidator.cpp:1182#6 0x00000000031cfddc in nebula::graph::MatchValidator::validateFilter (this=0x69433bbd0f80, filter=0x595077006eb0, whereClauseCtx=...) at /data/src/nebula-comm/src/graph/validator/MatchValidator.cpp:361#7 0x00000000031cdd60 in nebula::graph::MatchValidator::validateImpl (this=0x69433bbd0f80) at /data/src/nebula-comm/src/graph/validator/MatchValidator.cpp:66#8 0x00000000030d58e7 in nebula::graph::Validator::validate (this=0x69433bbd0f80) at /data/src/nebula-comm/src/graph/validator/Validator.cpp:354#9 0x0000000003114880 in nebula::graph::SequentialValidator::validateImpl (this=0x69433bbd0c00) at /data/src/nebula-comm/src/graph/validator/SequentialValidator.cpp:40#10 0x00000000030d58e7 in nebula::graph::Validator::validate (this=0x69433bbd0c00) at /data/src/nebula-comm/src/graph/validator/Validator.cpp:354#11 0x00000000030d4c8f in nebula::graph::Validator::validate (sentence=0x69433bc58870, qctx=0x7f25a94672a0) at /data/src/nebula-comm/src/graph/validator/Validator.cpp:285#12 0x0000000002ff4841 in nebula::graph::QueryInstance::validateAndOptimize (this=0x69433bc07640) at /data/src/nebula-comm/src/graph/service/QueryInstance.cpp:102#13 0x0000000002ff3920 in nebula::graph::QueryInstance::execute (this=0x69433bc07640) at /data/src/nebula-comm/src/graph/service/QueryInstance.cpp:42#14 0x0000000002fe9219 in nebula::graph::QueryEngine::execute (this=0x69433bc603c0, rctx=...) at /data/src/nebula-comm/src/graph/service/QueryEngine.cpp:57#15 0x0000000002f6145f in nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1::operator()(nebula::StatusOr >) (this=0x7f25a9452460, ret=...) at /data/src/nebula-comm/src/graph/service/GraphService.cpp:183#16 0x0000000002f60626 in folly::futures::detail::wrapInvoke >, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(folly::Try > >&&, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&)::{lambda()#1}::operator()() const (this=0x18e60dc8120) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:98#17 0x0000000002f605bf in folly::futures::detail::InvokeResultWrapper::wrapResult >, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(folly::Try > >&&, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&)::{lambda()#1}>(folly::futures::detail::wrapInvoke >, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(folly::Try > >&&, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&)::{lambda()#1}) (fn=...) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:90#18 0x0000000002f6057c in folly::futures::detail::wrapInvoke >, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(folly::Try > >&&, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&) ( t=..., f=...) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:108#19 0x0000000002f604cf in folly::Future > >::thenValue, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&) &&::{lambda(folly::Executor::KeepAlive&&, folly::Try > >&&)#1}::operator()(folly::Executor::KeepAlive&&, folly::Try > >&&) (this=0x7f25a9452460, t=...) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:991#20 0x0000000002f6046e in folly::futures::detail::CoreCallbackState > >::thenValue, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&) &&::{lambda(folly::Executor::KeepAlive&&, folly::Try > >&&)#1}>::invoke, folly::Try > > >(folly::Executor::KeepAlive&&, folly::Try > >&&) (this=0x7f25a9452460, args=..., args=...) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:144#21 0x0000000002f603cb in folly::futures::detail::detail_msvc_15_7_workaround::invoke >, folly::Future > >::thenValue, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&) &&::{lambda(folly::Executor::KeepAlive&&, folly::Try > >&&)#1}, void>, folly::futures::detail::CoreCallbackState&&, folly::Try > >&&)#1}>, nebula::StatusOr >, 0>(folly::futures::detail::tryExecutorCallableResult for more, q to quit, c to continue without paging--qQuit(rr) 可以看到出问题的 MatchStepRange在 src/parser/MatchPath.h:128通过 make_unique分配出的内存并初始化的：
119120 MatchEdge clone() const {121 auto me = MatchEdge();122 me.direction_ = direction_;123 me.alias_ = alias_;124 for (const auto& type : types_) {125 me.types_.emplace_back(std::make_unique(*DCHECK_NOTNULL(type)));126 }127 if (range_ != nullptr) {128 me.range_ = std::make_unique(*range_);129 }130 if (props_ != nullptr) {131 me.props_ = static_cast(props_->clone());132 }133 return me;134 }135136 private:137 Direction direction_;138 std::string alias_; 继续 continue 看这块内存上的数据什么时候被篡改成错误的值：
Continuing.Thread 16 hit Hardware watchpoint 4: *((size_t *) 0x69433b9998a0)Old value = 1New value = 00x0000000002ec2901 in std::__detail::_Hash_node_base::_Hash_node_base (this=0x69433b9998a0) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/hashtable_policy.h:218218 _Hash_node_base() noexcept : _M_nxt() { }(rr) bt#0 0x0000000002ec2901 in std::__detail::_Hash_node_base::_Hash_node_base (this=0x69433b9998a0) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/hashtable_policy.h:218#1 0x0000000002ed1191 in std::__detail::_Hash_node_value_base::_Hash_node_value_base (this=0x69433b9998a0) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/hashtable_policy.h:229#2 0x0000000002ed10c1 in std::__detail::_Hash_node::_Hash_node (this=0x69433b9998a0) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/hashtable_policy.h:279#3 0x0000000002ed0f9b in std::__detail::_Hashtable_alloc > >::_M_allocate_node (this=0x18e60dc63b8, __args=@0x18e60dc63a6: nebula::Expression::Kind::kVertex) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/hashtable_policy.h:2085#4 0x0000000002ed0cf3 in std::__detail::_AllocNode > >::operator() (this=0x18e60dc5ef8, __arg=@0x18e60dc63a6: nebula::Expression::Kind::kVertex) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/hashtable_policy.h:167#5 0x0000000002ed0bc2 in std::_Hashtable, std::__detail::_Identity, std::equal_to, std::hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits >::_M_insert > > > ( this=0x18e60dc63b8, __v=@0x18e60dc63a6: nebula::Expression::Kind::kVertex, __node_gen=..., __n_elt=1) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/hashtable.h:1852#6 0x0000000002ed06cd in std::__detail::_Insert_base, std::__detail::_Identity, std::equal_to, std::hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits >::insert (this=0x18e60dc63b8, __v=@0x18e60dc63a6: nebula::Expression::Kind::kVertex) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/hashtable_policy.h:824#7 0x0000000002ed042d in std::_Hashtable, std::__detail::_Identity, std::equal_to, std::hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits >::_Hashtable (this=0x18e60dc63b8, __f=0x18e60dc63a6, __l=0x18e60dc63a8, __bucket_hint=0, __h1=..., __h2=..., __h=..., __eq=..., __exk=..., __a=...) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/hashtable.h:1026#8 0x0000000002ed01bc in std::_Hashtable, std::__detail::_Identity, std::equal_to, std::hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits >::_Hashtable (this=0x18e60dc63b8, __l=..., __n=0, __hf=..., __eql=..., __a=...) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/hashtable.h:497#9 0x0000000002eae859 in std::unordered_set, std::equal_to, std::allocator >::unordered_set (this=0x18e60dc63b8, __l=..., __n=0, __hf=..., __eql=..., __a=...) at /usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/unordered_set.h:226#10 0x00000000031d2df0 in nebula::graph::MatchValidator::validateReturn (this=0x69433bbd0f80, ret=0x69433bc587b0, queryParts=..., retClauseCtx=...) at /data/src/nebula-comm/src/graph/validator/MatchValidator.cpp:471#11 0x00000000031ce962 in nebula::graph::MatchValidator::validateImpl (this=0x69433bbd0f80) at /data/src/nebula-comm/src/graph/validator/MatchValidator.cpp:117#12 0x00000000030d58e7 in nebula::graph::Validator::validate (this=0x69433bbd0f80) at /data/src/nebula-comm/src/graph/validator/Validator.cpp:354#13 0x0000000003114880 in nebula::graph::SequentialValidator::validateImpl (this=0x69433bbd0c00) at /data/src/nebula-comm/src/graph/validator/SequentialValidator.cpp:40#14 0x00000000030d58e7 in nebula::graph::Validator::validate (this=0x69433bbd0c00) at /data/src/nebula-comm/src/graph/validator/Validator.cpp:354#15 0x00000000030d4c8f in nebula::graph::Validator::validate (sentence=0x69433bc58870, qctx=0x7f25a94672a0) at /data/src/nebula-comm/src/graph/validator/Validator.cpp:285#16 0x0000000002ff4841 in nebula::graph::QueryInstance::validateAndOptimize (this=0x69433bc07640) at /data/src/nebula-comm/src/graph/service/QueryInstance.cpp:102#17 0x0000000002ff3920 in nebula::graph::QueryInstance::execute (this=0x69433bc07640) at /data/src/nebula-comm/src/graph/service/QueryInstance.cpp:42#18 0x0000000002fe9219 in nebula::graph::QueryEngine::execute (this=0x69433bc603c0, rctx=...) at /data/src/nebula-comm/src/graph/service/QueryEngine.cpp:57#19 0x0000000002f6145f in nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1::operator()(nebula::StatusOr >) (this=0x7f25a9452460, ret=...) at /data/src/nebula-comm/src/graph/service/GraphService.cpp:183#20 0x0000000002f60626 in folly::futures::detail::wrapInvoke >, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(folly::Try > >&&, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&)::{lambda()#1}::operator()() const (this=0x18e60dc8120) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:98#21 0x0000000002f605bf in folly::futures::detail::InvokeResultWrapper::wrapResult >, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(folly::Try > >&&, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&)::{lambda()#1}>(folly::futures::detail::wrapInvoke >, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(folly::Try > >&&, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&)::{lambda()#1}) (fn=...) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:90#22 0x0000000002f6057c in folly::futures::detail::wrapInvoke >, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(folly::Try > >&&, nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&) ( t=..., f=...) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:108#23 0x0000000002f604cf in folly::Future > >::thenValue, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1>(nebula::graph::GraphService::future_executeWithParameter(long, std::__cxx11::basic_string, std::allocator > const&, std::unordered_map, std::allocator >, nebula::Value, std::hash, std::allocator > >, std::equal_to, std::allocator > >, std::allocator, std::allocator > const, nebula::Value> > > const&)::$_1&&) &&::{lambda(folly::Executor::KeepAlive&&, folly::Try > >&&)#1}::operator()(folly::Executor::KeepAlive&&, folly::Try > >&&) (this=0x7f25a9452460, t=...) at /data/src/nebula-comm/build-debug/third-party/install/include/folly/futures/Future-inl.h:991--Type for more, q to quit, c to continue without paging--qQuit(rr) 非常神奇的是，这块内存在 src/graph/validator/MatchValidator.cpp:471中又分配给某个 hash 表了：
449 // Check validity of return clause. 450 // Disable return * without symbols, disable invalid expressions, check aggregate expression, 451 // rewrite expression to fit semantic, check available aliases, check columns, check limit and 452 // order by options. 453 Status MatchValidator::validateReturn(MatchReturn *ret, 454 const std::vector &queryParts, 455 ReturnClauseContext &retClauseCtx) { 456 YieldColumns *columns = retClauseCtx.qctx->objPool()->makeAndAdd(); 457 if (ret->returnItems()->allNamedAliases() && !queryParts.empty()) { 458 auto status = buildColumnsForAllNamedAliases(queryParts, columns); 459 if (!status.ok()) { 460 return status; 461 } 462 if (columns->empty() && !ret->returnItems()->columns()) { 463 return Status::SemanticError("RETURN * is not allowed when there are no variables in scope"); 464 } 465 } 466 std::vector exprs; 467 if (ret->returnItems()->columns()) { 468 exprs.reserve(ret->returnItems()->columns()->size()); 469 for (auto *column : ret->returnItems()->columns()->columns()) { 470 if (ExpressionUtils::hasAny(column->expr(), 471 {Expression::Kind::kVertex, Expression::Kind::kEdge})) { 472 return Status::SemanticError( 473 "keywords: vertex and edge are not supported in return clause `%s"", 474 column->toString().c_str()); 475 } 476 if (!retClauseCtx.yield->hasAgg_ && 477 ExpressionUtils::hasAny(column->expr(), {Expression::Kind::kAggregate})) { 478 retClauseCtx.yield->hasAgg_ = true; 479 } 480 column->setExpr(ExpressionUtils::rewriteAttr2LabelTagProp( 481 column->expr(), retClauseCtx.yield->aliasesAvailable)); 482 exprs.push_back(column->expr()); 483 columns->addColumn(column->clone().release()); 484 } 485 } 唯一的解释就是 MatchStepRange所在的内存被释放然后又分配出去了。重点关注 MatchStepRange内存的分配、释放过程，我们顺着 make_unique()分配 MatchStepRange的堆栈跟过去：
11711172 Status MatchValidator::validatePathInWhere(1173 WhereClauseContext &wctx,1174 const std::unordered_map &availableAliases,1175 std::vector &paths) {1176 auto expr = ExpressionUtils::flattenInnerLogicalExpr(wctx.filter);1177 auto *pool = qctx_->objPool();1178 ValidatePatternExpressionVisitor visitor(pool, vctx_);1179 expr->accept(&visitor);1180 std::vector pathPreds;1181 // FIXME(czp): Delete this function and add new expression visitor to cover all general cases1182 if (extractMultiPathPredicate(expr, pathPreds)) {1183 wctx.filter = nullptr;1184 } else {1185 // Flatten and fold the inner logical expressions that already have operands that can be1186 // compacted1187 wctx.filter =1188 ExpressionUtils::foldInnerLogicalExpr(ExpressionUtils::flattenInnerLogicalExpr(expr));1189 }1190 for (auto &pred : pathPreds) {1191 NG_RETURN_IF_ERROR(checkMatchPathExpr(pred, availableAliases));1192 // Build path alias1193 auto pathAlias = pred.toString();1194 pred.setAlias(new std::string(pathAlias));1195 paths.emplace_back();1196 NG_RETURN_IF_ERROR(validatePath(&pred, paths.back()));1197 NG_RETURN_IF_ERROR(buildRollUpPathInfo(&pred, paths.back()));1198 } MatchStepRange是 graph/validator/MatchValidator.cpp:1182这行代码触发分配的，保存在 pathPreds这个 vector 中。在 NebulaGraph 中不定长（变长）查询 :会触发 extractMultiPathPredicate()函数来分配 match path range，本文就是触发了 extractMultiPathPredicate()函数。
回到上面代码，这里就有个问题：pathPreds是个局部变量，validatePathInWhere()一旦执行结束它的内存就释放了，这当然包括 MatchStepRange这个 unique_ptr。再看 MatchStepRange这块内存是否在释放后还被其他地方被用到。查看代码我们发现 graph/validator/MatchValidator.cpp:1196这行代码的产生的调用链 validatePath()-> buildEdgeInfo()把 pred中的 MatchStepRange裸指针赋值出去了：
138 // Validate pattern from expression 139 Status MatchValidator::validatePath(const MatchPath *path, Path &pathInfo) { 140 // Pattern from expression won"t generate new variable 141 std::unordered_map dummy; 142 NG_RETURN_IF_ERROR(buildNodeInfo(path, pathInfo.nodeInfos, dummy)); 143 NG_RETURN_IF_ERROR(buildEdgeInfo(path, pathInfo.edgeInfos, dummy)); 144 NG_RETURN_IF_ERROR(buildPathExpr(path, pathInfo, dummy)); 145 pathInfo.isPred = path->isPredicate(); 146 pathInfo.isAntiPred = path->isAntiPredicate(); 147 148 return Status::OK(); 149 }... 263 // Build edges information by match pattern. 264 Status MatchValidator::buildEdgeInfo(const MatchPath *path, 265 std::vector &edgeInfos, 266 std::unordered_map &aliases) { 267 auto *sm = qctx_->schemaMng(); 268 auto steps = path->steps(); 269 edgeInfos.resize(steps); 270 271 for (auto i = 0u; i < steps; i++) { 272 auto *edge = path->edge(i); 273 auto &types = edge->types();... 298 AliasType aliasType = AliasType::kEdge; 299 auto *stepRange = edge->range(); 300 if (stepRange != nullptr) { 301 NG_RETURN_IF_ERROR(validateStepRange(stepRange)); 302 edgeInfos[i].range = stepRange; 看 src/graph/validator/MatchValidator.cpp:299，直接赋值了那块即将被释放的 MatchStepRange指针，这是一切悲剧的根源。
问题定位到了，也就好解决了。
谢谢你读完本文(///▽///)
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