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| author | Robert Haas <rhaas@postgresql.org> | 2017-01-05 12:27:09 -0500 |
|---|---|---|
| committer | Robert Haas <rhaas@postgresql.org> | 2017-01-05 12:27:09 -0500 |
| commit | 175ff6598e014b2fe84c06fa443161294fc2eed0 (patch) | |
| tree | dd690b09d8b6a8cce138a4c988446c5aab1254bd /src/backend/storage | |
| parent | 82f8107b92c9104ec9d9465f3f6a4c6dab4c124a (diff) | |
Fix possible crash reading pg_stat_activity.
With the old code, a backend that read pg_stat_activity without ever
having executed a parallel query might see a backend in the midst of
executing one waiting on a DSA LWLock, resulting in a crash. The
solution is for backends to register the tranche at startup time, not
the first time a parallel query is executed.
Report by Andreas Seltenreich. Patch by me, reviewed by Thomas Munro.
Diffstat (limited to 'src/backend/storage')
| -rw-r--r-- | src/backend/storage/lmgr/lwlock.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/backend/storage/lmgr/lwlock.c b/src/backend/storage/lmgr/lwlock.c index f4be4b4a7a6..1cf06848bb6 100644 --- a/src/backend/storage/lmgr/lwlock.c +++ b/src/backend/storage/lmgr/lwlock.c @@ -508,6 +508,8 @@ RegisterLWLockTranches(void) LWLockRegisterTranche(LWTRANCHE_LOCK_MANAGER, "lock_manager"); LWLockRegisterTranche(LWTRANCHE_PREDICATE_LOCK_MANAGER, "predicate_lock_manager"); + LWLockRegisterTranche(LWTRANCHE_PARALLEL_QUERY_DSA, + "parallel_query_dsa"); /* Register named tranches. */ for (i = 0; i < NamedLWLockTrancheRequests; i++) |