Fix the number of lwlocks needed by the "fast path" lock . It needs

one lock per backend or auxiliary process - the need for a lock for each
aux processes was not accounted for in NumLWLocks(). No-one noticed,
because the three locks needed for the three aux processes fit into the
few extra lwlocks we allocate for 3rd party modules that don't call
RequestAddinLWLocks() (NUM_USER_DEFINED_LWLOCKS, 4 by default).

diff --git a/src/backend/storage/lmgr/lwlock.c b/src/backend/storage/lmgr/lwlock.c
index 8fae67ebbb5d50ce4355f54df02e0d1dacb554aa..079eb29163e75e271a746bb8808da99fa4575ac3 100644 (file)
--- a/src/backend/storage/lmgr/lwlock.c
+++ b/src/backend/storage/lmgr/lwlock.c
@@ -167,8 +167,8 @@ NumLWLocks(void)
    /* bufmgr.c needs two for each shared buffer */
    numLocks += 2 * NBuffers;
 
-   /* lock.c needs one per backend */
-   numLocks += MaxBackends;
+   /* proc.c needs one for each backend or auxiliary process */
+   numLocks += MaxBackends + NUM_AUXILIARY_PROCS;
 
    /* clog.c needs one per CLOG buffer */
    numLocks += NUM_CLOG_BUFFERS;