[BUGS] BUG #14835: Postgres crashed

The following bug has been logged on the website:

Bug reference:      14835
Logged by:          Nicola Contu
Email address:      nicola.contu@gmail.com
PostgreSQL version: 9.6.5
Operating system:   Centos 6.9
Description:

Hello,
after upgrading to postgres 9.6.5 in the last 3weeks we had the db crashing
three times for the same reason :

SELECT: double free or corruption (!prev): 0x0000000001f4b440 ***
======= Backtrace: =========
/lib64/libc.so.6[0x3eee675dee]
/lib64/libc.so.6[0x3eee678c80]


======= Memory map: ========
00400000-009ff000 r-xp 00000000 fd:00 6431324
/usr/local/pgsql9.6.5/bin/postgres
00bfe000-00c0b000 rw-p 005fe000 fd:00 6431324
/usr/local/pgsql9.6.5/bin/postgres
00c0b000-00c5c000 rw-p 00000000 00:00 0
01dd5000-01e17000 rw-p 00000000 00:00 0
01e17000-0abf7000 rw-p 00000000 00:00 0
3441000000-3441016000 r-xp 00000000 fd:00 7602384
/lib64/libgcc_s-4.4.7-20120601.so.1
3441016000-3441215000 ---p 00016000 fd:00 7602384
/lib64/libgcc_s-4.4.7-20120601.so.1
3441215000-3441216000 rw-p 00015000 fd:00 7602384
/lib64/libgcc_s-4.4.7-20120601.so.1
3eee200000-3eee220000 r-xp 00000000 fd:00 7602252 /lib64/ld-2.12.so
(deleted)
3eee41f000-3eee421000 r--p 0001f000 fd:00 7602252 /lib64/ld-2.12.so
(deleted)
3eee421000-3eee422000 rw-p 00021000 fd:00 7602252 /lib64/ld-2.12.so
(deleted)
3eee422000-3eee423000 rw-p 00000000 00:00 0
3eee600000-3eee78a000 r-xp 00000000 fd:00 7602254 /lib64/libc-2.12.so
(deleted)
3eee78a000-3eee98a000 ---p 0018a000 fd:00 7602254 /lib64/libc-2.12.so
(deleted)
3eee98a000-3eee98e000 r--p 0018a000 fd:00 7602254 /lib64/libc-2.12.so
(deleted)
3eee98e000-3eee990000 rw-p 0018e000 fd:00 7602254 /lib64/libc-2.12.so
(deleted)
3eee990000-3eee994000 rw-p 00000000 00:00 0
3eeea00000-3eeea02000 r-xp 00000000 fd:00 7602600 /lib64/libdl-2.12.so
(deleted)
3eeea02000-3eeec02000 ---p 00002000 fd:00 7602600 /lib64/libdl-2.12.so
(deleted)
3eeec02000-3eeec03000 r--p 00002000 fd:00 7602600 /lib64/libdl-2.12.so
(deleted)
3eeec03000-3eeec04000 rw-p 00003000 fd:00 7602600 /lib64/libdl-2.12.so
(deleted)
3eeee00000-3eeee17000 r-xp 00000000 fd:00 7602273 /lib64/libpthread-2.12.so
(deleted)
3eeee17000-3eef017000 ---p 00017000 fd:00 7602273 /lib64/libpthread-2.12.so
(deleted)
3eef017000-3eef018000 r--p 00017000 fd:00 7602273 /lib64/libpthread-2.12.so
(deleted)
3eef018000-3eef019000 rw-p 00018000 fd:00 7602273 /lib64/libpthread-2.12.so
(deleted)
3eef019000-3eef01d000 rw-p 00000000 00:00 0
3eef600000-3eef683000 r-xp 00000000 fd:00 7602307 /lib64/libm-2.12.so
(deleted)
3eef683000-3eef882000 ---p 00083000 fd:00 7602307 /lib64/libm-2.12.so
(deleted)
3eef882000-3eef883000 r--p 00082000 fd:00 7602307 /lib64/libm-2.12.so
(deleted)
3eef883000-3eef884000 rw-p 00083000 fd:00 7602307 /lib64/libm-2.12.so
(deleted)
3eefa00000-3eefa07000 r-xp 00000000 fd:00 7602317 /lib64/librt-2.12.so
(deleted)
3eefa07000-3eefc06000 ---p 00007000 fd:00 7602317 /lib64/librt-2.12.so
(deleted)
3eefc06000-3eefc07000 r--p 00006000 fd:00 7602317 /lib64/librt-2.12.so
(deleted)
3eefc07000-3eefc08000 rw-p 00007000 fd:00 7602317 /lib64/librt-2.12.so
(deleted)
7fb338000000-7fb338021000 rw-p 00000000 00:00 0
7fb338021000-7fb33c000000 ---p 00000000 00:00 0
7fb33fe6b000-7fb340b2d000 rw-p 00000000 00:00 0
7fb345603000-7fb345609000 r-xp 00000000 fd:00 5771504
/usr/local/pgsql9.6.5/lib/fuzzystrmatch.so
7fb345609000-7fb345808000 ---p 00006000 fd:00 5771504
/usr/local/pgsql9.6.5/lib/fuzzystrmatch.so
7fb345808000-7fb345809000 rw-p 00005000 fd:00 5771504
/usr/local/pgsql9.6.5/lib/fuzzystrmatch.so
7fb345809000-7fb34688d000 rw-p 00000000 00:00 0
7fb34708e000-7fb347577000 rw-p 00000000 00:00 0
7fb347577000-7fb347584000 r-xp 00000000 fd:00 7602223
/lib64/libnss_files-2.12.so (deleted)
7fb347584000-7fb347783000 ---p 0000d000 fd:00 7602223
/lib64/libnss_files-2.12.so (deleted)
7fb347783000-7fb347784000 r--p 0000c000 fd:00 7602223
/lib64/libnss_files-2.12.so (deleted)
7fb347784000-7fb347785000 rw-p 0000d000 fd:00 7602223
/lib64/libnss_files-2.12.so (deleted)
7fb347794000-7fb5555e0000 rw-s 00000000 00:04 3756858110 /dev/zero
(deleted)
7fb5555e0000-7fb55b475000 r--p 00000000 fd:00 5656397
/usr/lib/locale/locale-archive (deleted)
7fb55b475000-7fb55b47a000 rw-p 00000000 00:00 0
7fb55b47e000-7fb55b47f000 rw-p 00000000 00:00 0
7fb55b47f000-7fb55b486000 r--s 00000000 fd:00 5651539
/usr/lib64/gconv/gconv-modules.cache
7fb55b486000-7fb55b488000 rw-s 00000000 00:10 3756858114
/dev/shm/PostgreSQL.353302406
7fb55b488000-7fb55b489000 rw-s 00000000 00:04 87130112 /SYSV0052e2c1
(deleted)
7fb55b489000-7fb55b48a000 rw-p 00000000 00:00 0
7ffd1618d000-7ffd161a2000 rw-p 00000000 00:00 0 [stack]
7ffd161e4000-7ffd161e5000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]

Is this a bug?

Can you help us on this?
Thank you


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