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Reset CurrentMemoryContext to TopMemoryContext at the beginning of error 

cleanup, ie, as soon as we have caught the longjmp.  This ensures that
current context will be a valid context throughout error cleanup.  Before
it was possible that current context was pointing at a context that would
get deleted during cleanup, leaving any subsequent pallocs in deep
trouble.  I was able to provoke an Assert failure when compiled with
asserts + -DCLOBBER_FREED_MEMORY, if I did something that would cause
an error to be reported by the backend large-object code, because indeed
that code operates in a context that gets deleted partway through xact
abort --- and CurrentMemoryContext was still pointing at it!  Boo hiss.
This commit is contained in:
Tom Lane 2000-04-30 21:29:23 +00:00
parent e0095c6c42
commit f6a3b87c7b
1 changed files with 4 additions and 4 deletions
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8
src/backend/tcop/postgres.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.153 2000/04/28 05:07:34 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.154 2000/04/30 21:29:23 tgl Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@ -127,7 +127,6 @@ bool ExitAfterAbort = false;
extern int NBuffers;
static bool EchoQuery = false; /* default don't echo */
time_t tim;
char pg_pathname[MAXPGPATH];
FILE *StatFp = NULL;
@ -1453,7 +1452,7 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
if (!IsUnderPostmaster)
{
puts("\nPOSTGRES backend interactive interface ");
puts("$Revision: 1.153 $ $Date: 2000/04/28 05:07:34 $\n");
puts("$Revision: 1.154 $ $Date: 2000/04/30 21:29:23 $\n");
}
/*
@ -1473,7 +1472,8 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
if (sigsetjmp(Warn_restart, 1) != 0)
{
time(&tim);
/* Make sure we are in a valid memory context */
MemoryContextSwitchTo(TopMemoryContext);
if (Verbose)
TPRINTF(TRACE_VERBOSE, "AbortCurrentTransaction");