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Commit1358466

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Fix bootstrap.c so that database startup process and bgwriter properly release
LWLocks during a panic exit. This avoids the possible self-deadlock pointedout by Qingqing Zhou. Also, I noted that an error during LoadFreeSpaceMap()or BuildFlatFiles() would result in exit(0) which would leave the postmasterthinking all is well. Added a critical section to ensure such errors don'tallow startup to proceed.Backpatched to 8.1. The 8.0 code is a bit different and I'm not sure if theproblem exists there; given we've not seen this reported from the field, I'mgoing to be conservative about backpatching any further.
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‎src/backend/bootstrap/bootstrap.c

Lines changed: 24 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/bootstrap/bootstrap.c,v 1.215 2006/05/10 23:18:39 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/bootstrap/bootstrap.c,v 1.216 2006/06/08 23:55:48 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -55,6 +55,7 @@ extern char *optarg;
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staticvoidusage(void);
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staticvoidbootstrap_signals(void);
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staticvoidShutdownDummyProcess(intcode,Datumarg);
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statichashnode*AddStr(char*str,intstrlength,intmderef);
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staticForm_pg_attributeAllocateAttribute(void);
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staticintCompHash(char*str,intlen);
@@ -395,6 +396,9 @@ BootstrapMain(int argc, char *argv[])
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/* finish setting up bufmgr.c */
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InitBufferPoolBackend();
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/* register a shutdown callback for LWLock cleanup */
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on_shmem_exit(ShutdownDummyProcess,0);
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}
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/*
@@ -417,8 +421,14 @@ BootstrapMain(int argc, char *argv[])
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caseBS_XLOG_STARTUP:
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bootstrap_signals();
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StartupXLOG();
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/*
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* These next two functions don't consider themselves critical,
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* but we'd best PANIC anyway if they fail.
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*/
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START_CRIT_SECTION();
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LoadFreeSpaceMap();
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BuildFlatFiles(false);
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END_CRIT_SECTION();
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proc_exit(0);/* startup done */
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caseBS_XLOG_BGWRITER:
@@ -552,6 +562,19 @@ bootstrap_signals(void)
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}
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}
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/*
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* Begin shutdown of a dummy process. This is approximately the equivalent
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* of ShutdownPostgres() in postinit.c. We can't run transactions in a
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* dummy process, so most of the work of AbortTransaction() is not needed,
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* but we do need to make sure we've released any LWLocks we are holding.
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* (This is only critical during an error exit.)
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*/
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staticvoid
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ShutdownDummyProcess(intcode,Datumarg)
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{
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LWLockReleaseAll();
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}
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/* ----------------
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*error handling / abort routines
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* ----------------

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