[pgpool-general: 8037] Re: PgPool-II 4.2.7: several segfaults on CentOS 8
Muhammad Usama
m.usama at gmail.com
Thu Mar 3 11:40:37 JST 2022
> On 03-Mar-2022, at 4:51 AM, Tatsuo Ishii <ishii at sraoss.co.jp> wrote:
>
> Not sure at this moment because the cause of the segfault is not known
> yet. Also it's not known how to reproduce the segfault. So I think
> more investigation is needed.
Hi,
I have identified the issue and will push the fix in few hours after testing. I don’t think upgrading to 4.3 will help in this case
Thanks
>
>> Thanks!
>> In the meantime, do you think that upgrading to 4.3 could solve the problem?
>>
>> Thank you
>>
>>> Il giorno mer 2 mar 2022 alle ore 14:51 Tatsuo Ishii <ishii at sraoss.co.jp>
>>> ha scritto:
>>>
>>> Ok, It seems the segfault occured in watchdog.
>>>
>>> Usama,
>>> Can you please take a look at this?
>>>
>>> Best reagards,
>>> --
>>> Tatsuo Ishii
>>> SRA OSS, Inc. Japan
>>> English: http://www.sraoss.co.jp/index_en.php
>>> Japanese:http://www.sraoss.co.jp
>>>
>>> From: shacky <shacky83 at gmail.com>
>>> Subject: Re: [pgpool-general: 8031] Re: PgPool-II 4.2.7: several segfaults
>>> on CentOS 8
>>> Date: Wed, 2 Mar 2022 12:57:50 +0100
>>> Message-ID: <CAPz3gm=
>>> wPi_FqSJpnN99gKFBtg0Lg-0x7RiqAPdytfqra8saYQ at mail.gmail.com>
>>>
>>>> Here is the complete bt output:
>>>>
>>> ===================================================================================================
>>>> DEV root at proxy2-dev ~# 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:
>>>> <http://www.gnu.org/software/gdb/bugs/>.
>>>> Find the GDB manual and other documentation resources online at:
>>>> <http://www.gnu.org/software/gdb/documentation/>.
>>>>
>>>> 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
>>>> (gdb) bt
>>>> #0 __strlen_sse2 () at ../sysdeps/x86_64/multiarch/../strlen.S:120
>>>> #1 0x00007fe9b70ac0af in _IO_vfprintf_internal (s=s at entry
>>> =0x7ffdb575f7c0,
>>>> format=format at entry=0x55d3177fd2a8 "STATE MACHINE INVOKED WITH EVENT =
>>> %s
>>>> Current State = %s",
>>>> ap=ap at entry=0x7ffdb575f9b0) at vfprintf.c:1638
>>>> #2 0x00007fe9b7164bfd in ___vsnprintf_chk (s=s at entry=0x55d3177fd6b8
>>> "STATE
>>>> MACHINE INVOKED WITH EVENT = it has found us again", maxlen=<optimized
>>>> out>, maxlen at entry=1024,
>>>> flags=flags at entry=1, slen=slen at entry=18446744073709551615,
>>>> format=format at entry=0x55d3177fd2a8 "STATE MACHINE INVOKED WITH EVENT =
>>> %s
>>>> Current State = %s",
>>>> args=args at entry=0x7ffdb575f9b0) at vsnprintf_chk.c:63
>>>> #3 0x000055d316dc9013 in vsnprintf (__ap=0x7ffdb575f9b0,
>>>> __fmt=0x55d3177fd2a8 "STATE MACHINE INVOKED WITH EVENT = %s Current
>>> State =
>>>> %s", __n=1024,
>>>> __s=0x55d3177fd6b8 "STATE MACHINE INVOKED WITH EVENT = it has found
>>> us
>>>> again") at /usr/include/bits/stdio2.h:80
>>>> #4 pvsnprintf (buf=0x55d3177fd6b8 "STATE MACHINE INVOKED WITH EVENT = it
>>>> has found us again", len=len at entry=1024,
>>>> fmt=fmt at entry=0x55d3177fd2a8 "STATE MACHINE INVOKED WITH EVENT = %s
>>>> Current State = %s", args=args at entry=0x7ffdb575f9b0) at
>>> utils/psprintf.c:126
>>>> #5 0x000055d316e11eab in appendStringInfoVA (str=str at entry
>>> =0x7ffdb575f990,
>>>> fmt=fmt at entry=0x55d3177fd2a8 "STATE MACHINE INVOKED WITH EVENT = %s
>>> Current
>>>> State = %s",
>>>> args=args at entry=0x7ffdb575f9b0) at stringinfo.c:138
>>>> #6 0x000055d316ddeabf in errmsg (fmt=fmt at entry=0x55d316f577d0 "STATE
>>>> MACHINE INVOKED WITH EVENT = %s Current State = %s") at
>>>> ../../src/utils/error/elog.c:665
>>>> #7 0x000055d316e30c4b in watchdog_state_machine
>>>> (event=event at entry=WD_EVENT_I_AM_APPEARING_FOUND,
>>>> wdNode=wdNode at entry=0x55d3177fbcf8, pkt=pkt at entry=0x0,
>>>> clusterCommand=clusterCommand at entry=0x0) at watchdog.c:5394
>>>> #8 0x000055d316e34a7b in cluster_service_message_processor
>>>> (pkt=0x55d317804898, wdNode=0x55d3177fbcf8) at watchdog.c:4030
>>>> #9 standard_packet_processor (wdNode=wdNode at entry=0x55d3177fbcf8,
>>>> pkt=pkt at entry=0x55d317804898) at watchdog.c:4202
>>>> #10 0x000055d316e312cd in watchdog_state_machine_nw_isolation
>>>> (clusterCommand=<optimized out>, pkt=<optimized out>, wdNode=<optimized
>>>> out>, event=<optimized out>)
>>>> at watchdog.c:6458
>>>> #11 watchdog_state_machine (event=event at entry=WD_EVENT_PACKET_RCV,
>>>> wdNode=wdNode at entry=0x55d3177fbcf8, pkt=pkt at entry=0x55d317804898,
>>>> clusterCommand=clusterCommand at entry=0x0)
>>>> at watchdog.c:5561
>>>> #12 0x000055d316e38514 in read_sockets (rmask=rmask at entry
>>> =0x7ffdb57604e0,
>>>> pending_fds_count=pending_fds_count at entry=1) at watchdog.c:8207
>>>> #13 0x000055d316e3b04f in watchdog_main () at watchdog.c:3500
>>>> #14 0x000055d316e3bb81 in fork_watchdog_child () at watchdog.c:1127
>>>> #15 initialize_watchdog () at watchdog.c:625
>>>> #16 0x000055d316d73088 in reaper () at main/pgpool_main.c:2428
>>>> #17 0x000055d316d79e28 in PgpoolMain (discard_status=<optimized out>,
>>>> clear_memcache_oidmaps=<optimized out>) at main/pgpool_main.c:473
>>>> #18 0x000055d316d7053c in main (argc=<optimized out>,
>>> argv=0x7ffdb576d1b8)
>>>> at main/main.c:365
>>>>
>>> ===================================================================================================
>>>>
>>>> Thank you!
>>>>
>>>> Il giorno mer 2 mar 2022 alle ore 05:05 Tatsuo Ishii <ishii at sraoss.co.jp
>>>>
>>>> ha scritto:
>>>>
>>>>> 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:
>>>>>> <http://www.gnu.org/software/gdb/bugs/>.
>>>>>> Find the GDB manual and other documentation resources online at:
>>>>>> <http://www.gnu.org/software/gdb/documentation/>.
>>>>>>
>>>>>> 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
>>>>>>>
>>>>>
>>>
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