gdb /usr/local/pgsql/bin/postgres your_core_file
If it's needed, change path to postgres file.
In gdb, type
# bt
and send output
sure, here you have:
$ gdb /home/pgdba/work/bin/postgres /home/pgdba/data/core
GNU gdb 6.3-debian
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-linux"...Using host libthread_db library "/lib/tls/libthread_db.so.1".
Core was generated by `postgres: trader_ru_tomcat tra'.
Program terminated with signal 11, Segmentation fault.
warning: current_sos: Can't read pathname for load map: Input/output error
Reading symbols from /usr/lib/i686/cmov/libssl.so.0.9.7...done.
Loaded symbols for /usr/lib/i686/cmov/libssl.so.0.9.7
Reading symbols from /usr/lib/i686/cmov/libcrypto.so.0.9.7...done.
Loaded symbols for /usr/lib/i686/cmov/libcrypto.so.0.9.7
Reading symbols from /lib/tls/libcrypt.so.1...done.
Loaded symbols for /lib/tls/libcrypt.so.1
Reading symbols from /lib/tls/libdl.so.2...done.
Loaded symbols for /lib/tls/libdl.so.2
Reading symbols from /lib/tls/libm.so.6...done.
Loaded symbols for /lib/tls/libm.so.6
Reading symbols from /lib/tls/libc.so.6...done.
Loaded symbols for /lib/tls/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/tls/libnss_files.so.2...done.
Loaded symbols for /lib/tls/libnss_files.so.2
Reading symbols from /home/pgdba/work/lib/postgresql/tsearch2.so...done.
Loaded symbols for /home/pgdba/work/lib/postgresql/tsearch2.so
#0 0xb7ce4a85 in memmove () from /lib/tls/libc.so.6
(gdb) bt
#0 0xb7ce4a85 in memmove () from /lib/tls/libc.so.6
#1 0x080bc224 in PageDeletePostingItem (page=0xb28039a0 "\020", offset=53719) at gindatapage.c:291
#2 0x080bf558 in ginDeletePage (gvs=0xbfc2ab80, deleteBlkno=29194, leftBlkno=29059, parentBlkno=70274, myoff=351, isParentRoot=0 '\0') at ginvacuum.c:268
#3 0x080bf95c in ginScanToDelete (gvs=0xbfc2ab80, blkno=29194, isRoot=0 '\0', parent=0xb2df39a0, myoff=351) at ginvacuum.c:412
#4 0x080bf8f2 in ginScanToDelete (gvs=0xbfc2ab80, blkno=99489, isRoot=0 '\0', parent=0xb2b359a0, myoff=2) at ginvacuum.c:399
#5 0x080bf8f2 in ginScanToDelete (gvs=0xbfc2ab80, blkno=43, isRoot=1 '\001', parent=0xb28019a0, myoff=0) at ginvacuum.c:399
#6 0x080bfa83 in ginVacuumPostingTree (gvs=0xbfc2ab80, rootBlkno=43) at ginvacuum.c :446
#7 0x080bffd0 in ginbulkdelete (fcinfo=0xb2804768) at ginvacuum.c:638
#8 0x08259717 in FunctionCall4 (flinfo=0xfffffff6, arg1=2994751336, arg2=2994751336, arg3=2994751336, arg4=2994751336) at fmgr.c:1206
#9 0x08097005 in index_bulk_delete (info=0xbfc2af10, stats=0xb2804768, callback=0xb2804768, callback_state=0xb2804768) at indexam.c:573
#10 0x08143d42 in vacuum_index (vacpagelist=0xb2804768, indrel=0xa788c6a8, num_tuples=1675710, keep_tuples=0) at vacuum.c:3029
#11 0x08140c00 in full_vacuum_rel ( vacstmt=0x83f74c0) at vacuum.c:1172
#12 0x08140a21 in vacuum_rel (relid=2994751336, vacstmt=0x83f74c0, expected_relkind=114 'r') at vacuum.c:1086
#13 0x08140127 in vacuum (vacstmt=0x83f74c0, relids=0x4601) at vacuum.c:397
#14 0x081da588 in PortalRunUtility (portal=0x841c160, query=0x83f7510, dest=0x83f73b8, completionTag=0xbfc2b2a0 "") at pquery.c:1063
#15 0x081da833 in PortalRunMulti (portal=0x841c160, dest=0x83f73b8, altdest=0x83f73b8, completionTag=0xbfc2b2a0 "") at pquery.c:1131
#16 0x081d9f7b in PortalRun (portal=0x841c160, count=2147483647, dest=0x83f73b8, altdest=0x83f73b8, completionTag=0xbfc2b2a0 "") at pquery.c:700
#17 0x081d526d in exec_simple_query (query_string=0x83f71a8 "VACUUM FULL verbose analyze adverts;") at postgres.c:939
#18 0x081d8725 in PostgresMain (argc=4, argv=0x836c368, username=0x836c328 "trader_ru_tomcat") at postgres.c:3419
#19 0x081b0216 in BackendRun (port=0x839b858) at postmaster.c:2909
#20 0x081af9ef in BackendStartup (port=0x839b858) at postmaster.c:2536
#21 0x081adaba in ServerLoop () at postmaster.c:1206
#22 0x081acf5a in PostmasterMain (argc=1, argv=0x836a508) at postmaster.c:958
#23 0x0816b3d4 in main (argc=1, argv=0x836a508) at main.c:188
(gdb)
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