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Commit37236ca

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Fix missing initializations of MyProc.delayChkptEnd
This commit fixes an oversight introduced in10520f4, that has addeddelayChkptEnd to PGPROC to avoid ABI breakages on stable branches, wheretwo spots have missed to initialize this variable (delayChkpt wasswitched back from int to bool, and it was initialized as 0 so there wasno consequences for it):- InitProcess(), where the per-process data structures of a backend areinitialized.- InitAuxiliaryProcess(), same but for auxiliary processes.An interruption during relation truncation while this flag is set couldcause an assertion failure when a follow-up process does a relationtruncation while reusing the same PGPROC entry. A second effect couldbe incorrect checkpoint end delays.While on it, add an assertion in ProcArrayClearTransaction() fordelayChkptEnd to be in line with5788e25. This is needed only for v14.This issue affects v11~v14, but not v15~, as we use a single fieldcalled delayChkptFlags to delay checkpoints there.Author: suyu.cmj (mengjuan.cmj@alibaba-inc.com)Reviewed-by: Kyotaro Horiguchi, Michael PaquierDiscussion:https://postgr.es/m/9c3d2a49-db5f-43cb-840b-d58f9a684295.mengjuan.cmj@alibaba-inc.comBackpatch-through: 11
1 parenta9231fe commit37236ca

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2 files changed

+5
-2
lines changed

2 files changed

+5
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lines changed

‎src/backend/storage/ipc/procarray.c

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -644,6 +644,7 @@ ProcArrayClearTransaction(PGPROC *proc)
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/* redundant, but just in case */
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pgxact->vacuumFlags &= ~PROC_VACUUM_STATE_MASK;
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proc->delayChkpt= false;
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proc->delayChkptEnd= false;
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/* Clear the subtransaction-XID cache too */
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pgxact->nxids=0;

‎src/backend/storage/lmgr/proc.c

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -396,7 +396,8 @@ InitProcess(void)
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MyProc->roleId=InvalidOid;
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MyProc->tempNamespaceId=InvalidOid;
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MyProc->isBackgroundWorker=IsBackgroundWorker;
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MyProc->delayChkpt=0;
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MyProc->delayChkpt= false;
400+
MyProc->delayChkptEnd= false;
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MyPgXact->vacuumFlags=0;
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/* NB -- autovac launcher intentionally does not set IS_AUTOVACUUM */
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if (IsAutoVacuumWorkerProcess())
@@ -578,7 +579,8 @@ InitAuxiliaryProcess(void)
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MyProc->roleId=InvalidOid;
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MyProc->tempNamespaceId=InvalidOid;
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MyProc->isBackgroundWorker=IsBackgroundWorker;
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MyProc->delayChkpt=0;
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MyProc->delayChkpt= false;
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MyProc->delayChkptEnd= false;
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MyPgXact->vacuumFlags=0;
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MyProc->lwWaiting= false;
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MyProc->lwWaitMode=0;

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