segfault in locking code

Hello,

I have a custom code in postgres which runs properly in some occasions and segfaults some times. The trace is as below :

Program received signal SIGSEGV, Segmentation fault.
0x081ae8c4 in LWLockRelease (lockid=664)
at ../../../../src/include/storage/s_lock.h:128
128 __asm__ __volatile__(

(gdb) where
#0 0x081ae8c4 in LWLockRelease (lockid=664)
at ../../../../src/include/storage/s_lock.h:128
#1 0x0808f820 in heap_fetch_tuple (relation=0xb5d986d8, snapshot=0xa298aa0,
buffer=305, tid=0xa23f600, tuple=0xa29db0c, pgstat_info=0xa29db30,
tupStat=0xbfac9374) at heapam.c:3404
#2 0x08144df2 in ExecNestLoop (node=0xa298f30) at nodeNestloop.c:452
#3 0x08136840 in ExecProcNode (node=0xa298f30) at execProcnode.c:352
#4 0x08135ba1 in ExecutorRun (queryDesc=0xa298ac8,
direction=ForwardScanDirection, count=0) at execMain.c:1162
#5 0x081b7e60 in PortalRunSelect (portal=0xa296a98,
forward=<value optimized out>, count=0, dest=0x82d3308) at pquery.c:794
#6 0x081b8a88 in PortalRun (portal=0xa296a98, count=2147483647,
dest=0x82d3308, altdest=0x82d3308, completionTag=0xbfac9608 "")
at pquery.c:646
#7 0x081b48fc in exec_simple_query (
query_string=0xa275b58 "select l_orderkey as a from tpcd.orders, tpcd.lineitem where o_orderkey=l_orderkey ;\n") at postgres.c:1003
#8 0x081b6371 in PostgresMain (argc=1, argv=0xa2379f0,
username=0xa238398 "suresh") at postgres.c:3221
#9 0x081532e3 in main (argc=2, argv=Cannot access memory at address 0xfffffffd
) at main.c:411

It segfaults in the locking _asm_ code. What could be the reason for this variable behavior ?

Thanks and regards,
Suresh

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