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LLVMJIT: Release JIT context after running ExprContext shutdown callbacks.

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Due to inlining it previously was possible that an ExprContext's
shutdown callback pointed to a JITed function. As the JIT context
previously was shut down before the shutdown callbacks were called,
that could lead to segfaults.  Fix the ordering.

Reported-By: Dmitry Dolgov
Author: Andres Freund
Discussion: https://postgr.es/m/CA+q6zcWO7CeAJtHBxgcHn_hj+PenM=tvG0RJ93X1uEJ86+76Ug@mail.gmail.com
Backpatch: 11-, where JIT compilation was added
This commit is contained in:
Andres Freund 2018-07-25 16:31:49 -07:00
parent bcafa263ec
commit 3acc4acd9b
2 changed files with 13 additions and 10 deletions
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5
src/backend/executor/execMain.c
View File

@ -47,7 +47,6 @@
#include "commands/trigger.h"
#include "executor/execdebug.h"
#include "foreign/fdwapi.h"
#include "jit/jit.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "optimizer/clauses.h"
@ -498,10 +497,6 @@ standard_ExecutorEnd(QueryDesc *queryDesc)
UnregisterSnapshot(estate->es_snapshot);
UnregisterSnapshot(estate->es_crosscheck_snapshot);
/* release JIT context, if allocated */
if (estate->es_jit)
jit_release_context(estate->es_jit);
/*
* Must switch out of context before destroying it
*/

18
src/backend/executor/execUtils.c
View File

@ -45,6 +45,7 @@
#include "access/relscan.h"
#include "access/transam.h"
#include "executor/executor.h"
#include "jit/jit.h"
#include "mb/pg_wchar.h"
#include "nodes/nodeFuncs.h"
#include "parser/parsetree.h"
@ -174,11 +175,11 @@ CreateExecutorState(void)
*
* Release an EState along with all remaining working storage.
*
* Note: this is not responsible for releasing non-memory resources,
* such as open relations or buffer pins. But it will shut down any
* still-active ExprContexts within the EState. That is sufficient
* cleanup for situations where the EState has only been used for expression
* evaluation, and not to run a complete Plan.
* Note: this is not responsible for releasing non-memory resources, such as
* open relations or buffer pins. But it will shut down any still-active
* ExprContexts within the EState and deallocate associated JITed expressions.
* That is sufficient cleanup for situations where the EState has only been
* used for expression evaluation, and not to run a complete Plan.
*
* This can be called in any memory context ... so long as it's not one
* of the ones to be freed.
@ -204,6 +205,13 @@ FreeExecutorState(EState *estate)
/* FreeExprContext removed the list link for us */
}
/* release JIT context, if allocated */
if (estate->es_jit)
{
jit_release_context(estate->es_jit);
estate->es_jit = NULL;
}
/*
* Free the per-query memory context, thereby releasing all working
* memory, including the EState node itself.