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Fix valgrind failure

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Buildfarm member skink reports that the new REPACK code is trying to
write uninitialized bytes to disk, which correspond to padding space in
the SerializedSnapshotData struct.  Silence that by initializing the
memory in SerializeSnapshot() to all zeroes.

Co-authored-by: Srinath Reddy Sadipiralla <srinath2133@gmail.com>
Co-authored-by: Álvaro Herrera <alvherre@kurilemu.de>
Discussion: https://postgr.es/m/1976915.1775537087@sss.pgh.pa.us
This commit is contained in:
Álvaro Herrera 2026-04-07 11:13:16 +02:00
parent 8c3e22a8f8
commit 5bcc3fbd19
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2 changed files with 2 additions and 2 deletions
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2
src/backend/commands/repack_worker.c
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@ -342,8 +342,8 @@ export_initial_snapshot(Snapshot snapshot, DecodingWorkerShared *shared)
/* To make restoration easier, write the snapshot size first. */
BufFileWrite(file, &snap_size, sizeof(snap_size));
BufFileWrite(file, snap_space, snap_size);
pfree(snap_space);
BufFileClose(file);
pfree(snap_space);
/* Increase the counter to tell the backend that the file is available. */
SpinLockAcquire(&shared->mutex);

2
src/backend/utils/time/snapmgr.c
View file

@ -1735,7 +1735,7 @@ EstimateSnapshotSpace(Snapshot snapshot)
void
SerializeSnapshot(Snapshot snapshot, char *start_address)
{
SerializedSnapshotData serialized_snapshot;
SerializedSnapshotData serialized_snapshot = {0};
Assert(snapshot->subxcnt >= 0);