[pgpool-general: 8032] Re: PgPool-II 4.2.7: several segfaults on CentOS 8

Wed Mar 2 13:04:57 JST 2022

Can you please share the result of gdb command "bt"?  Otherwise we
cannot figure out which place of pgpool is related to the problem.
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp

> This is the coredump of the segmentation fault happened on proxy2-dev:
> 
> ===================================================================================================
> DEV root at proxy2-dev /v/l/s/coredump# gdb /usr/bin/pgpool
> /root/pgpool-coredumps/core.pgpool.26.e120553488834d47bff3c72a21a9bba1.694540.1646129274000000
> GNU gdb (GDB) Red Hat Enterprise Linux 8.2-16.el8
> Copyright (C) 2018 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
>>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
> Type "show copying" and "show warranty" for details.
> This GDB was configured as "x86_64-redhat-linux-gnu".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
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> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from /usr/bin/pgpool...Reading symbols from
> /usr/lib/debug/usr/bin/pgpool-4.2.5-1pgdg.rhel8.x86_64.debug...done.
> done.
> 
> warning: Can't open file (null) during file-backed mapping note processing
> [New LWP 694540]
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
> Core was generated by `pgpool: watchdog                                '.
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0  __strlen_sse2 () at ../sysdeps/x86_64/multiarch/../strlen.S:120
> 120 movdqu (%rax), %xmm4
> ===================================================================================================
> 
> Thanks.
> 
> Il giorno mar 1 mar 2022 alle ore 17:39 shacky <shacky83 at gmail.com> ha
> scritto:
> 
>> Hi,
>> I am experiencing many segfaults on PgPool-II 4.2.7 installed on two
>> different environments (production and test).
>>
>> Each environment is composed by three different PgPool-II nodes configured
>> in a PgPool-II watchdog cluster, and I am experiencing segfaults on every 6
>> PgPool-II nodes.
>>
>> The 6 PgPool-II nodes are distributed on 4 different physical servers, so
>> it's very unlikely that it's due to some hardware problems.
>>
>> These are the snippets of the segfaults notifications:
>>
>> ===================================================================================================
>> DEV root at proxy1-dev ~# dmesg|grep pgpool
>> [   15.970081] pgpool[834]: segfault at 8 ip 00007fb6069f5d8a sp
>> 00007fff848e7448 error 4 in libc-2.28.so[7fb60695c000+1bc000]
>> [   17.672642] pgpool[1336]: segfault at 8 ip 00007fb6069f5d8a sp
>> 00007fff848e73e8 error 4 in libc-2.28.so[7fb60695c000+1bc000]
>>
>> DEV root at proxy2-dev ~# dmesg|grep pgpool
>> [ 2109.530239] pgpool[848]: segfault at 8 ip 00007f372d024d8a sp
>> 00007ffe5126c7d8 error 4 in libc-2.28.so[7f372cf8b000+1bc000]
>> [ 4752.698303] pgpool[22406]: segfault at 8 ip 00007fe9b70f3d8a sp
>> 00007ffdb575f298 error 4 in libc-2.28.so[7fe9b705a000+1bc000]
>> [ 4761.219745] pgpool[22450]: segfault at 8 ip 00007fe9b70f3d8a sp
>> 00007ffdb575f238 error 4 in libc-2.28.so[7fe9b705a000+1bc000]
>> [7089616.463274] pgpool[22568]: segfault at 8 ip 00007fe9b70f3d8a sp
>> 00007ffdb575f208 error 4 in libc-2.28.so[7fe9b705a000+1bc000]
>> [7090394.285732] pgpool[661708]: segfault at 8 ip 00007fe9b70f3d8a sp
>> 00007ffdb575f208 error 4 in libc-2.28.so[7fe9b705a000+1bc000]
>> [7090504.438435] pgpool[661929]: segfault at 8 ip 00007fe9b70f3d8a sp
>> 00007ffdb575f208 error 4 in libc-2.28.so[7fe9b705a000+1bc000]
>> [7090528.565248] pgpool[661991]: segfault at 8 ip 00007fe9b70f3d8a sp
>> 00007ffdb575f238 error 4 in libc-2.28.so[7fe9b705a000+1bc000]
>>
>> DEV root at proxy3-dev ~# dmesg|grep pgpool
>> [ 2085.795853] pgpool[879]: segfault at 8 ip 00007f9f45e57d8a sp
>> 00007ffc605d6678 error 4 in libc-2.28.so[7f9f45dbe000+1bc000]
>> [7088526.747095] pgpool[20105]: segfault at 8 ip 00007f9f45e57d8a sp
>> 00007ffc605d65e8 error 4 in libc-2.28.so[7f9f45dbe000+1bc000]
>> [7088528.639860] pgpool[946407]: segfault at 8 ip 00007f9f45e57d8a sp
>> 00007ffc605d6618 error 4 in libc-2.28.so[7f9f45dbe000+1bc000]
>> [7089324.627060] pgpool[946415]: segfault at 8 ip 00007f9f45e57d8a sp
>> 00007ffc605d6618 error 4 in libc-2.28.so[7f9f45dbe000+1bc000]
>> [7089384.787587] pgpool[946506]: segfault at 8 ip 00007f9f45e57d8a sp
>> 00007ffc605d6618 error 4 in libc-2.28.so[7f9f45dbe000+1bc000]
>> [7089580.047313] pgpool[946521]: segfault at 8 ip 00007f9f45e57d8a sp
>> 00007ffc605d6618 error 4 in libc-2.28.so[7f9f45dbe000+1bc000]
>> [7089591.340077] pgpool[946547]: segfault at 8 ip 00007f9f45e57d8a sp
>> 00007ffc605d6618 error 4 in libc-2.28.so[7f9f45dbe000+1bc000]
>> [7089597.788270] pgpool[946556]: segfault at 8 ip 00007f9f45e57d8a sp
>> 00007ffc605d6618 error 4 in libc-2.28.so[7f9f45dbe000+1bc000]
>> [7089614.064323] pgpool[946565]: segfault at 8 ip 00007f9f45e57d8a sp
>> 00007ffc605d6618 error 4 in libc-2.28.so[7f9f45dbe000+1bc000]
>> [7090492.104936] pgpool[946574]: segfault at 8 ip 00007f9f45e57d8a sp
>> 00007ffc605d65e8 error 4 in libc-2.28.so[7f9f45dbe000+1bc000]
>> [7090575.965820] pgpool[946743]: segfault at 8 ip 00007f9f45e57d8a sp
>> 00007ffc605d6618 error 4 in libc-2.28.so[7f9f45dbe000+1bc000]
>>
>> PROD root at proxy1-prod ~# dmesg|grep pgpool
>> [    6.631205] pgpool[814]: segfault at 8 ip 00007fe9729dbd8a sp
>> 00007ffe7174ae88 error 4 in libc-2.28.so[7fe972942000+1bc000]
>> [   17.054962] pgpool[1288]: segfault at 8 ip 00007fe9729dbd8a sp
>> 00007ffe7174ae28 error 4 in libc-2.28.so[7fe972942000+1bc000]
>> [868124.710835] pgpool[1415]: segfault at 8 ip 00007fe9729dbd8a sp
>> 00007ffe7174ae28 error 4 in libc-2.28.so[7fe972942000+1bc000]
>> [868127.082112] pgpool[1632535]: segfault at 8 ip 00007fe9729dbd8a sp
>> 00007ffe7174ae28 error 4 in libc-2.28.so[7fe972942000+1bc000]
>>
>> PROD root at proxy2-prod ~# dmesg|grep pgpool
>> [   16.783629] pgpool[835]: segfault at 8 ip 00007f5f87877d8a sp
>> 00007ffe3d47eb08 error 4 in libc-2.28.so[7f5f877de000+1bc000]
>> [   21.012660] pgpool[1381]: segfault at 8 ip 00007f5f87877d8a sp
>> 00007ffe3d47eaa8 error 4 in libc-2.28.so[7f5f877de000+1bc000]
>> [ 1978.102123] pgpool[1400]: segfault at 8 ip 00007f5f87877d8a sp
>> 00007ffe3d47eaa8 error 4 in libc-2.28.so[7f5f877de000+1bc000]
>>
>> PROD root at proxy3-prod ~# dmesg|grep pgpool
>> [   13.567572] pgpool[826]: segfault at 8 ip 00007f4359c84d8a sp
>> 00007fff04ddf008 error 4 in libc-2.28.so[7f4359beb000+1bc000]
>> [   15.559884] pgpool[1384]: segfault at 8 ip 00007f4359c84d8a sp
>> 00007fff04ddefa8 error 4 in libc-2.28.so[7f4359beb000+1bc000]
>> [1094174.197742] pgpool[1398]: segfault at 8 ip 00007f4359c84d8a sp
>> 00007fff04ddef78 error 4 in libc-2.28.so[7f4359beb000+1bc000]
>>
>> ===================================================================================================
>>
>> The operating system is CentOS 8 (fully updated) with these PgPool-II
>> packages installed:
>>
>> ===================================================================================================
>> PROD root at proxy3 ~# rpm -qa|grep -i pgpool
>> pgpool-II-pg12-4.2.7-1pgdg.rhel8.x86_64
>> pgpool-II-release-4.2-1.noarch
>>
>> ===================================================================================================
>>
>> Could you help me to understand what's going on, please?
>>
>> Thank you very much!
>> Bye
>>