double free corruption?

Folks

i received the follow message from backend ,it's this
a bug?

best regards
and happy new year
MDC

pd: any clue are welcomed.

*** glibc detected *** postgres: postgres richelet
201.235.11.133(2504) SELECT: double free or corruption
(!prev): 0x0845d7e8 ***
======= Backtrace: =========
/lib/libc.so.6[0xb7e0e930]
/lib/libc.so.6(__libc_free+0x89)[0xb7e0ff99]
postgres: postgres richelet 201.235.11.133(2504)
SELECT[0x82b1c0b]
postgres: postgres richelet 201.235.11.133(2504)
SELECT(MemoryContextDelete+0x42)[0x82b2152]
postgres: postgres richelet 201.235.11.133(2504)
SELECT(MemoryContextDeleteChildren+0x28)[0x82b2198]
postgres: postgres richelet 201.235.11.133(2504)
SELECT(MemoryContextDelete+0x12)[0x82b2122]
postgres: postgres richelet 201.235.11.133(2504)
SELECT(MemoryContextDeleteChildren+0x28)[0x82b2198]
postgres: postgres richelet 201.235.11.133(2504)
SELECT(AtAbort_Portals+0x6f)[0x82b281f]
postgres: postgres richelet 201.235.11.133(2504)
SELECT[0x80adef3]
postgres: postgres richelet 201.235.11.133(2504)
SELECT(AbortCurrentTransaction+0x25)[0x80ae115]
postgres: postgres richelet 201.235.11.133(2504)
SELECT(PostgresMain+0x25c6)[0x81f7226]
postgres: postgres richelet 201.235.11.133(2504)
SELECT[0x81ca226]
postgres: postgres richelet 201.235.11.133(2504)
SELECT(PostmasterMain+0x81d)[0x81caf0d]
postgres: postgres richelet 201.235.11.133(2504)
SELECT(main+0x1c7)[0x8182e67]
/lib/libc.so.6(__libc_start_main+0xd8)[0xb7dc0838]
postgres: postgres richelet 201.235.11.133(2504)
SELECT[0x807fa81]
======= Memory map: ========
08048000-0836a000 r-xp 00000000 03:03 715320
/usr/local/pgsql/bin/postgres
0836a000-08373000 rw-p 00321000 03:03 715320
/usr/local/pgsql/bin/postgres
08373000-0846d000 rw-p 08373000 00:00 0
[heap]
b5f00000-b5f21000 rw-p b5f00000 00:00 0
b5f21000-b6000000 ---p b5f21000 00:00 0
b60c4000-b60ce000 r-xp 00000000 03:03 744303
/usr/lib/gcc/i686-pc-linux-gnu/4.1.2/libgcc_s.so.1
b60ce000-b60cf000 rw-p 00009000 03:03 744303
/usr/lib/gcc/i686-pc-linux-gnu/4.1.2/libgcc_s.so.1
b60d7000-b60d9000 r-xp 00000000 03:03 708661
/usr/lib/gconv/ISO8859-1.so
b60d9000-b60db000 rw-p 00001000 03:03 708661
/usr/lib/gconv/ISO8859-1.so
b60db000-b60e3000 r-xp 00000000 03:03 527740
/usr/local/pgsql/lib/fuzzystrmatch.so
b60e3000-b60e4000 rw-p 00007000 03:03 527740
/usr/local/pgsql/lib/fuzzystrmatch.so
b60e4000-b6146000 rw-p b60e4000 00:00 0
b6146000-b6154000 r-xp 00000000 03:03 709308
/lib/libresolv-2.5.so
b6154000-b6156000 rw-p 0000d000 03:03 709308
/lib/libresolv-2.5.so
b6156000-b6158000 rw-p b6156000 00:00 0
b6158000-b615c000 r-xp 00000000 03:03 709745
/lib/libnss_dns-2.5.so
b615c000-b615e000 rw-p 00003000 03:03 709745
/lib/libnss_dns-2.5.so
b615e000-b6166000 r-xp 00000000 03:03 708470
/lib/libnss_files-2.5.so
b6166000-b6168000 rw-p 00007000 03:03 708470
/lib/libnss_files-2.5.so
b6169000-b6170000 r--s 00000000 03:03 6427
/usr/lib/gconv/gconv-modules.cache
b6170000-b61a3000 r--p 00000000 03:03 8975
/usr/lib/locale/es_AR/LC_CTYPE
b61a3000-b61a8000 r--p 00000000 03:03 16329
/usr/lib/locale/es_AR/LC_COLLATE
b61a8000-b7daa000 rw-s 00000000 00:08 114456
/SYSV0052e2c1 (deleted)
b7daa000-b7dab000 rw-p b7daa000 00:00 0
b7dab000-b7ecd000 r-xp 00000000 03:03 709248
/lib/libc-2.5.so
b7ecd000-b7ece000 r--p 00122000 03:03 709248
/lib/libc-2.5.so
b7ece000-b7ed0000 rw-p 00123000 03:03 709248
/lib/libc-2.5.so
b7ed0000-b7ed3000 rw-p b7ed0000 00:00 0
b7ed3000-b7ef6000 r-xp 00000000 03:03 709734
/lib/libm-2.5.so
b7ef6000-b7ef8000 rw-p 00022000 03:03 709734
/lib/libm-2.5.so
b7ef8000-b7efa000 r-xp 00000000 03:03 709751
/lib/libdl-2.5.so
b7efa000-b7efc000 rw-p 00001000 03:03 709751
/lib/libdl-2.5.so
b7efc000-b7f01000 r-xp 00000000 03:03 709885
/lib/libcrypt-2.5.so
b7f01000-b7f03000 rw-p 00004000 03:03 709885
/lib/libcrypt-2.5.so
b7f03000-b7f2b000 rw-p b7f03000 00:00 0
b7f2d000-b7f2e000 r-xp 00000000 03:03 715438
/usr/local/pgsql/lib/utf8_and_iso8859_1.so
b7f2e000-b7f2f000 rw-p 00000000 03:03 715438
/usr/local/pgsql/lib/utf8_and_iso8859_1.so
b7f2f000-b7f30000 r--p 00000000 03:03 206641
/usr/lib/locale/es_AR/LC_TIME
b7f30000-b7f31000 r--p 00000000 03:03 16760
/usr/lib/locale/es_AR/LC_NUMERIC
b7f31000-b7f32000 r--p 00000000 03:03 206642
/usr/lib/locale/es_AR/LC_MONETARY
b7f32000-b7f33000 r--p 00000000 03:03 16336
/usr/lib/locale/es_AR/LC_MESSAGES/SYS_LC_MESSAGES
b7f33000-b7f4d000 r-xp 00000000 03:03 709923
/lib/ld-2.5.so
b7f4d000-b7f4e000 r--p 00019000 03:03 709923
/lib/ld-2.5.so
b7f4e000-b7f4f000 rw-p 0001a000 03:03 709923
/lib/ld-2.5.so
bfdc4000-bfdda000 rw-p bfdc4000 00:00 0
[stack]
ffffe000-fffff000 r-xp 00000000 00:00 0
[vdso]
LOG: server process (PID 15558) was terminated by
signal 6: Aborted
LOG: terminating any other active server processes
WARNING: terminating connection because of crash of
another server process
DETAIL: The postmaster has commanded this server
process to roll back the current transaction and exit,
because another server process exited abnormally and
possibly corrupted shared memory.
HINT: In a moment you should be able to reconnect to
the database and repeat your command.
WARNING: terminating connection because of crash of
another server process
DETAIL: The postmaster has commanded this server
process to roll back the current transaction and exit,
because another server process exited abnormally and
possibly corrupted shared memory.
HINT: In a moment you should be able to reconnect to
the database and repeat your command.
LOG: all server processes terminated; reinitializing
LOG: database system was interrupted; last known up
at 2007-12-28 09:20:37 ART
LOG: database system was not properly shut down;
automatic recovery in progress
LOG: record with zero length at 0/20AC262C
LOG: redo is not required
LOG: autovacuum launcher started
LOG: database system is ready to accept connections

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