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Commit0aa1e9a

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Fix possible crash due to incorrect allocation context.
Commitaf33039 aimed to reduceleakage from tqueue.c, which is good. Unfortunately, by changing thememory context in which all of gather_readnext() executes, it alsochanged the context in which ExecShutdownGatherWorkers executes, whichis not good, because that function eventually causes a call toExecParallelRetrieveInstrumentation, which proceeds to allocateplanstate->worker_instrument in a short-lived context, causing acrash.Rushabh Lathia, reviewed by Amit Kapila and by me.
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‎src/backend/executor/execParallel.c‎

Lines changed: 11 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -500,6 +500,7 @@ ExecParallelRetrieveInstrumentation(PlanState *planstate,
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intn;
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intibytes;
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intplan_node_id=planstate->plan->plan_node_id;
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MemoryContextoldcontext;
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/* Find the instumentation for this node. */
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for (i=0;i<instrumentation->num_plan_nodes;++i)
@@ -514,10 +515,19 @@ ExecParallelRetrieveInstrumentation(PlanState *planstate,
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for (n=0;n<instrumentation->num_workers;++n)
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InstrAggNode(planstate->instrument,&instrument[n]);
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517-
/* Also store the per-worker detail. */
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/*
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* Also store the per-worker detail.
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*
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* Worker instrumentation should be allocated in the same context as
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* the regular instrumentation information, which is the per-query
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* context. Switch into per-query memory context.
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*/
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oldcontext=MemoryContextSwitchTo(planstate->state->es_query_cxt);
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ibytes=mul_size(instrumentation->num_workers,sizeof(Instrumentation));
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planstate->worker_instrument=
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palloc(ibytes+ offsetof(WorkerInstrumentation,instrument));
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MemoryContextSwitchTo(oldcontext);
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planstate->worker_instrument->num_workers=instrumentation->num_workers;
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memcpy(&planstate->worker_instrument->instrument,instrument,ibytes);
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