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Avoid infinite loop in InvalidateBuffer if we ourselves are holding

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a pin on the victim buffer.
This commit is contained in:
Tom Lane 2005-03-18 05:25:23 +00:00
parent afb66ad8dd
commit cef01c3355
1 changed files with 4 additions and 1 deletions
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5
src/backend/storage/buffer/bufmgr.c
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.186 2005/03/04 20:21:06 tgl Exp $ * $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.187 2005/03/18 05:25:23 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -551,6 +551,9 @@ retry:
{ {
UnlockBufHdr_NoHoldoff(buf); UnlockBufHdr_NoHoldoff(buf);
LWLockRelease(BufMappingLock); LWLockRelease(BufMappingLock);
/* safety check: should definitely not be our *own* pin */
if (PrivateRefCount[buf->buf_id] != 0)
elog(ERROR, "buffer is pinned in InvalidateBuffer");
WaitIO(buf); WaitIO(buf);
goto retry; goto retry;
} }