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Commit4616d57

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committed
Fix all the server-side SIGQUIT handlers (grumble ... why so many identical
copies?) to ensure they really don't run proc_exit/shmem_exit callbacks,as was intended. I broke this behavior recently by installing atexitcallbacks without thinking about the one case where we truly don't wantto run those callback functions. Noted in an example from Dave Page.
1 parentabc9245 commit4616d57

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6 files changed

+76
-34
lines changed

6 files changed

+76
-34
lines changed

‎src/backend/access/transam/xlog.c

Lines changed: 14 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.339 2009/05/14 21:28:35 tgl Exp $
10+
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.340 2009/05/15 15:56:39 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -7790,14 +7790,22 @@ startupproc_quickdie(SIGNAL_ARGS)
77907790
PG_SETMASK(&BlockSig);
77917791

77927792
/*
7793-
* DO NOT proc_exit() -- we're here because shared memory may be
7794-
* corrupted, so we don't want to try to clean up our transaction. Just
7795-
* nail the windows shut and get out of town.
7796-
*
7793+
* We DO NOT want to run proc_exit() callbacks -- we're here because
7794+
* shared memory may be corrupted, so we don't want to try to clean up our
7795+
* transaction. Just nail the windows shut and get out of town. Now that
7796+
* there's an atexit callback to prevent third-party code from breaking
7797+
* things by calling exit() directly, we have to reset the callbacks
7798+
* explicitly to make this work as intended.
7799+
*/
7800+
on_exit_reset();
7801+
7802+
/*
77977803
* Note we do exit(2) not exit(0).This is to force the postmaster into a
77987804
* system reset cycle if some idiot DBA sends a manual SIGQUIT to a random
77997805
* backend. This is necessary precisely because we don't clean up our
7800-
* shared memory state.
7806+
* shared memory state. (The "dead man switch" mechanism in pmsignal.c
7807+
* should ensure the postmaster sees this as a crash, too, but no harm
7808+
* in being doubly sure.)
78017809
*/
78027810
exit(2);
78037811
}

‎src/backend/postmaster/autovacuum.c

Lines changed: 14 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -55,7 +55,7 @@
5555
*
5656
*
5757
* IDENTIFICATION
58-
* $PostgreSQL: pgsql/src/backend/postmaster/autovacuum.c,v 1.94 2009/03/31 22:12:48 tgl Exp $
58+
* $PostgreSQL: pgsql/src/backend/postmaster/autovacuum.c,v 1.95 2009/05/15 15:56:39 tgl Exp $
5959
*
6060
*-------------------------------------------------------------------------
6161
*/
@@ -1337,14 +1337,22 @@ avl_quickdie(SIGNAL_ARGS)
13371337
PG_SETMASK(&BlockSig);
13381338

13391339
/*
1340-
* DO NOT proc_exit() -- we're here because shared memory may be
1341-
* corrupted, so we don't want to try to clean up our transaction. Just
1342-
* nail the windows shut and get out of town.
1343-
*
1340+
* We DO NOT want to run proc_exit() callbacks -- we're here because
1341+
* shared memory may be corrupted, so we don't want to try to clean up our
1342+
* transaction. Just nail the windows shut and get out of town. Now that
1343+
* there's an atexit callback to prevent third-party code from breaking
1344+
* things by calling exit() directly, we have to reset the callbacks
1345+
* explicitly to make this work as intended.
1346+
*/
1347+
on_exit_reset();
1348+
1349+
/*
13441350
* Note we do exit(2) not exit(0).This is to force the postmaster into a
13451351
* system reset cycle if some idiot DBA sends a manual SIGQUIT to a random
13461352
* backend. This is necessary precisely because we don't clean up our
1347-
* shared memory state.
1353+
* shared memory state. (The "dead man switch" mechanism in pmsignal.c
1354+
* should ensure the postmaster sees this as a crash, too, but no harm
1355+
* in being doubly sure.)
13481356
*/
13491357
exit(2);
13501358
}

‎src/backend/postmaster/bgwriter.c

Lines changed: 14 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -37,7 +37,7 @@
3737
*
3838
*
3939
* IDENTIFICATION
40-
* $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.57 2009/03/26 22:26:06 petere Exp $
40+
* $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.58 2009/05/15 15:56:39 tgl Exp $
4141
*
4242
*-------------------------------------------------------------------------
4343
*/
@@ -798,14 +798,22 @@ bg_quickdie(SIGNAL_ARGS)
798798
PG_SETMASK(&BlockSig);
799799

800800
/*
801-
* DO NOT proc_exit() -- we're here because shared memory may be
802-
* corrupted, so we don't want to try to clean up our transaction. Just
803-
* nail the windows shut and get out of town.
804-
*
801+
* We DO NOT want to run proc_exit() callbacks -- we're here because
802+
* shared memory may be corrupted, so we don't want to try to clean up our
803+
* transaction. Just nail the windows shut and get out of town. Now that
804+
* there's an atexit callback to prevent third-party code from breaking
805+
* things by calling exit() directly, we have to reset the callbacks
806+
* explicitly to make this work as intended.
807+
*/
808+
on_exit_reset();
809+
810+
/*
805811
* Note we do exit(2) not exit(0).This is to force the postmaster into a
806812
* system reset cycle if some idiot DBA sends a manual SIGQUIT to a random
807813
* backend. This is necessary precisely because we don't clean up our
808-
* shared memory state.
814+
* shared memory state. (The "dead man switch" mechanism in pmsignal.c
815+
* should ensure the postmaster sees this as a crash, too, but no harm
816+
* in being doubly sure.)
809817
*/
810818
exit(2);
811819
}

‎src/backend/postmaster/walwriter.c

Lines changed: 14 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -34,7 +34,7 @@
3434
*
3535
*
3636
* IDENTIFICATION
37-
* $PostgreSQL: pgsql/src/backend/postmaster/walwriter.c,v 1.5 2009/01/01 17:23:46 momjian Exp $
37+
* $PostgreSQL: pgsql/src/backend/postmaster/walwriter.c,v 1.6 2009/05/15 15:56:39 tgl Exp $
3838
*
3939
*-------------------------------------------------------------------------
4040
*/
@@ -288,14 +288,22 @@ wal_quickdie(SIGNAL_ARGS)
288288
PG_SETMASK(&BlockSig);
289289

290290
/*
291-
* DO NOT proc_exit() -- we're here because shared memory may be
292-
* corrupted, so we don't want to try to clean up our transaction. Just
293-
* nail the windows shut and get out of town.
294-
*
291+
* We DO NOT want to run proc_exit() callbacks -- we're here because
292+
* shared memory may be corrupted, so we don't want to try to clean up our
293+
* transaction. Just nail the windows shut and get out of town. Now that
294+
* there's an atexit callback to prevent third-party code from breaking
295+
* things by calling exit() directly, we have to reset the callbacks
296+
* explicitly to make this work as intended.
297+
*/
298+
on_exit_reset();
299+
300+
/*
295301
* Note we do exit(2) not exit(0).This is to force the postmaster into a
296302
* system reset cycle if some idiot DBA sends a manual SIGQUIT to a random
297303
* backend. This is necessary precisely because we don't clean up our
298-
* shared memory state.
304+
* shared memory state. (The "dead man switch" mechanism in pmsignal.c
305+
* should ensure the postmaster sees this as a crash, too, but no harm
306+
* in being doubly sure.)
299307
*/
300308
exit(2);
301309
}

‎src/backend/storage/ipc/ipc.c

Lines changed: 5 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -13,7 +13,7 @@
1313
*
1414
*
1515
* IDENTIFICATION
16-
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipc.c,v 1.103 2009/05/05 20:06:07 tgl Exp $
16+
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipc.c,v 1.104 2009/05/15 15:56:39 tgl Exp $
1717
*
1818
*-------------------------------------------------------------------------
1919
*/
@@ -166,7 +166,8 @@ proc_exit_prepare(int code)
166166
/* do our shared memory exits first */
167167
shmem_exit(code);
168168

169-
elog(DEBUG3,"proc_exit(%d)",code);
169+
elog(DEBUG3,"proc_exit(%d): %d callbacks to make",
170+
code,on_proc_exit_index);
170171

171172
/*
172173
* call all the registered callbacks.
@@ -193,7 +194,8 @@ proc_exit_prepare(int code)
193194
void
194195
shmem_exit(intcode)
195196
{
196-
elog(DEBUG3,"shmem_exit(%d)",code);
197+
elog(DEBUG3,"shmem_exit(%d): %d callbacks to make",
198+
code,on_shmem_exit_index);
197199

198200
/*
199201
* call all the registered callbacks.

‎src/backend/tcop/postgres.c

Lines changed: 15 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.565 2009/01/07 19:35:43 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.566 2009/05/15 15:56:39 tgl Exp $
1212
*
1313
* NOTES
1414
* this is the "main" module of the postgres backend and
@@ -2495,14 +2495,22 @@ quickdie(SIGNAL_ARGS)
24952495
" database and repeat your command.")));
24962496

24972497
/*
2498-
* DO NOT proc_exit() -- we're here because shared memory may be
2499-
* corrupted, so we don't want to try to clean up our transaction. Just
2500-
* nail the windows shut and get out of town.
2501-
*
2498+
* We DO NOT want to run proc_exit() callbacks -- we're here because
2499+
* shared memory may be corrupted, so we don't want to try to clean up our
2500+
* transaction. Just nail the windows shut and get out of town. Now that
2501+
* there's an atexit callback to prevent third-party code from breaking
2502+
* things by calling exit() directly, we have to reset the callbacks
2503+
* explicitly to make this work as intended.
2504+
*/
2505+
on_exit_reset();
2506+
2507+
/*
25022508
* Note we do exit(2) not exit(0).This is to force the postmaster into a
25032509
* system reset cycle if some idiot DBA sends a manual SIGQUIT to a random
25042510
* backend. This is necessary precisely because we don't clean up our
2505-
* shared memory state.
2511+
* shared memory state. (The "dead man switch" mechanism in pmsignal.c
2512+
* should ensure the postmaster sees this as a crash, too, but no harm
2513+
* in being doubly sure.)
25062514
*/
25072515
exit(2);
25082516
}
@@ -2554,7 +2562,7 @@ die(SIGNAL_ARGS)
25542562
void
25552563
authdie(SIGNAL_ARGS)
25562564
{
2557-
exit(1);
2565+
proc_exit(1);
25582566
}
25592567

25602568
/*

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