[pgpool-general: 8095] Re: PgPool 4.3.1 segfaults
Tatsuo Ishii
ishii at sraoss.co.jp
Sun Apr 24 08:57:17 JST 2022
Hi Vitaly,
Glad to hear that.
Thank you for the feedback!
> Hello Tatsuo Ishii,
>
> I haven't seen any segfault messages in the log since my last message.
> I think the problem was solved by this patch.
>
> Thank you.
>
> чт, 21 апр. 2022 г. в 02:22, Tatsuo Ishii <ishii at sraoss.co.jp>:
>
>> Hello,
>>
>> Thank you for testing. I am looking forward to hearing from you.
>>
>> > Hello Tatsuo Ishii,
>> >
>> > Thanks for your reply.
>> > I've rebuilt the rpm package with applied patch and updated my test
>> stand.
>> > I'm going to wait a few days and see the result.
>> >
>> > With best regards, Vitaly.
>> >
>> > ср, 20 апр. 2022 г. в 07:27, Tatsuo Ishii <ishii at sraoss.co.jp>:
>> >
>> >> It seems similar issue as this:
>> >> https://www.pgpool.net/pipermail/pgpool-general/2022-April/008131.html
>> >>
>> >> If so, a fix has been already committed.
>> >>
>> >>
>> >>
>> https://git.postgresql.org/gitweb/?p=pgpool2.git;a=commit;h=1c7603bf1979e416230d006ef8e71810b98f15c4
>> >>
>> >> You can try it (rebuilding pgpool from the source code) or wait till
>> >> next minor release (scheduled on May 19th, 2022).
>> >>
>> >> Best reagards,
>> >> --
>> >> Tatsuo Ishii
>> >> SRA OSS, Inc. Japan
>> >> English: http://www.sraoss.co.jp/index_en.php
>> >> Japanese:http://www.sraoss.co.jp
>> >>
>> >> > Hello PgPool Team,
>> >> >
>> >> > I've seen repeated segfaults in our test environment.
>> >> >
>> >> > Environment:
>> >> > 1. 2 app servers with stand alone pgpool on each server.
>> >> > 2. 2 DB servers with PostgreSQL 14 on it with streaming replication.
>> >> > 3. All servers - hardware servers in Hezner.
>> >> >
>> >> > My PgPool was installed from PgPool RPM repository:
>> >> > $ rpm -qa | grep pgpool
>> >> > pgpool-II-release-4.3-1.noarch
>> >> > pgpool-II-pg14-4.3.1-1pgdg.rhel7.x86_64
>> >> > pgpool-II-pg14-debuginfo-4.3.1-1pgdg.rhel7.x86_64
>> >> >
>> >> > Main strange issue - We saw segfaults only on the second application
>> >> node.
>> >> > Main difference with nodes - kernel version:
>> >> > node1: Linux app1.dev-cluster.local 3.10.0-1127.18.2.el7.x86_64 #1 SMP
>> >> Sun
>> >> > Jul 26 15:27:06 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
>> >> > node2: Linux app2.dev-cluster.local 3.10.0-862.11.6.el7.x86_64 #1 SMP
>> Tue
>> >> > Aug 14 21:49:04 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
>> >> > and sysctl.conf:
>> >> > node1:
>> >> > # Redirect 10k RPS
>> >> > # Default 128
>> >> > net.core.somaxconn = 10240
>> >> > # Default 1000
>> >> > net.core.netdev_max_backlog = 10240
>> >> >
>> >> > node2:
>> >> > # the kernel's socket backlog limit
>> >> > net.core.somaxconn = 1024
>> >> > # maximum size of the receive queue
>> >> > net.core.netdev_max_backlog=3000
>> >> >
>> >> > pgpool.conf:
>> >> > backend_clustering_mode = 'streaming_replication'
>> >> > socket_dir = '/var/run/pgpool'
>> >> > pcp_socket_dir = '/var/run/pgpool'
>> >> > backend_hostname0 = '10.10.10.2'
>> >> > backend_port0 = 5432
>> >> > backend_weight0 = 1
>> >> > backend_data_directory0 = '/var/lib/pgsql/14/data'
>> >> > backend_flag0 = 'ALLOW_TO_FAILOVER'
>> >> > backend_application_name0 = 'hezner-db1'
>> >> > backend_hostname1 = '10.10.10.1'
>> >> > backend_port1 = 5432
>> >> > backend_weight1 = 1
>> >> > backend_data_directory1 = '/var/lib/pgsql/14/data'
>> >> > backend_flag1 = 'ALLOW_TO_FAILOVER'
>> >> > backend_application_name1 = 'hezner-db2'
>> >> > enable_pool_hba = on
>> >> > pool_passwd = 'pool_passwd'
>> >> > num_init_children = 600
>> >> > max_pool = 1
>> >> > child_max_connections = 1
>> >> > connection_cache = off
>> >> > load_balance_mode = off
>> >> > sr_check_period = 0
>> >> > sr_check_user = 'postgres'
>> >> > sr_check_database = 'postgres'
>> >> > health_check_period = 3
>> >> > health_check_timeout = 1
>> >> > health_check_user = 'postgres'
>> >> > health_check_max_retries = 3
>> >> > health_check_retry_delay = 1
>> >> > connect_timeout = 1000
>> >> > failover_command = '/etc/pgpool-II/failover.sh %d %h %p %D %m %H %M
>> %P %r
>> >> > %R %N %S'
>> >> > failover_on_backend_error = off
>> >> > failover_on_backend_shutdown = off
>> >> > hostname0 = ''
>> >> > wd_ipc_socket_dir = '/var/run/pgpool'
>> >> >
>> >> > For last day (time in JST):
>> >> > [Tue Apr 19 01:10:03 2022] pgpool[12136]: segfault at 14 ip
>> >> > 0000000000435935 sp 00007ffd4836f920 error 6 in pgpool[400000+21a000]
>> >> > [Tue Apr 19 01:28:02 2022] pgpool[23275]: segfault at 14 ip
>> >> > 000000000043532e sp 00007ffd4836f920 error 6 in pgpool[400000+21a000]
>> >> > [Tue Apr 19 01:45:31 2022] pgpool[32436]: segfault at 14 ip
>> >> > 000000000043532e sp 00007ffd4836f920 error 6 in pgpool[400000+21a000]
>> >> > [Tue Apr 19 06:14:26 2022] pgpool[4583]: segfault at 14 ip
>> >> 000000000043532e
>> >> > sp 00007ffd4836f920 error 6 in pgpool[400000+21a000]
>> >> > [Tue Apr 19 07:05:02 2022] pgpool[27061]: segfault at 14 ip
>> >> > 0000000000435935 sp 00007ffd4836f920 error 6 in pgpool[400000+21a000]
>> >> > [Tue Apr 19 12:04:56 2022] pgpool[21666]: segfault at 14 ip
>> >> > 000000000043532e sp 00007ffd4836f920 error 6 in pgpool[400000+21a000]
>> >> > [Tue Apr 19 16:24:56 2022] pgpool[26156]: segfault at 14 ip
>> >> > 000000000043532e sp 00007ffd4836f920 error 6 in pgpool[400000+21a000]
>> >> > [Tue Apr 19 18:27:02 2022] pgpool[21477]: segfault at 14 ip
>> >> > 0000000000435935 sp 00007ffd4836f920 error 6 in pgpool[400000+21a000]
>> >> > [Tue Apr 19 21:10:05 2022] pgpool[10103]: segfault at 14 ip
>> >> > 0000000000435935 sp 00007ffdfc6a0e00 error 6 in pgpool[400000+21a000]
>> >> > [Wed Apr 20 02:51:23 2022] pgpool[16108]: segfault at 14 ip
>> >> > 000000000043532e sp 00007ffdfc6a0e00 error 6 in pgpool[400000+21a000]
>> >> > [Wed Apr 20 02:55:45 2022] pgpool[16874]: segfault at 14 ip
>> >> > 000000000043532e sp 00007ffdfc6a0e00 error 6 in pgpool[400000+21a000]
>> >> >
>> >> > I got only the last 3 core dumps. They were the same.
>> >> > The last core dump:
>> >> > GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-114.el7
>> >> > Copyright (C) 2013 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".
>> >> > For bug reporting instructions, please see:
>> >> > <http://www.gnu.org/software/gdb/bugs/>...
>> >> > Reading symbols from /usr/bin/pgpool...Reading symbols from
>> >> > /usr/lib/debug/usr/bin/pgpool.debug...done.
>> >> > done.
>> >> > [New LWP 16874]
>> >> > [Thread debugging using libthread_db enabled]
>> >> > Using host libthread_db library "/lib64/libthread_db.so.1".
>> >> > Core was generated by `pgpool: wait for connection request
>> '.
>> >> > Program terminated with signal 11, Segmentation fault.
>> >> > #0 0x000000000043532e in do_child (fds=fds at entry=0x17593e0) at
>> >> > protocol/child.c:333
>> >> > 333 proc_info->wait_for_connect = 0;
>> >> > Missing separate debuginfos, use: debuginfo-install
>> >> > audit-libs-2.8.4-4.el7.x86_64 cyrus-sasl-lib-2.1.26-23.el7.x86_64
>> >> > glibc-2.17-260.el7_6.3.x86_64 keyutils-libs-1.5.8-3.el7.x86_64
>> >> > krb5-libs-1.15.1-19.el7.x86_64 libcap-ng-0.7.5-4.el7.x86_64
>> >> > libcom_err-1.42.9-12.el7_5.x86_64 libgcc-4.8.5-36.el7.x86_64
>> >> > libmemcached-1.0.16-5.el7.x86_64 libselinux-2.5-14.1.el7.x86_64
>> >> > libstdc++-4.8.5-36.el7.x86_64 nspr-4.19.0-1.el7_5.x86_64
>> >> > nss-3.36.0-5.el7_5.x86_64 nss-softokn-freebl-3.36.0-5.el7_5.x86_64
>> >> > nss-util-3.36.0-1.el7_5.x86_64 openldap-2.4.44-15.el7_5.x86_64
>> >> > openssl-libs-1.0.2k-21.el7_9.x86_64 pam-1.1.8-22.el7.x86_64
>> >> > pcre-8.32-17.el7.x86_64 postgresql14-libs-14.2-1PGDG.rhel7.x86_64
>> >> > zlib-1.2.7-18.el7.x86_64
>> >> > (gdb) bt full
>> >> > #0 0x000000000043532e in do_child (fds=fds at entry=0x17593e0) at
>> >> > protocol/child.c:333
>> >> > sp = <optimized out>
>> >> > saddr = {addr = {ss_family = 0, __ss_padding = '\000' <repeats
>> >> 117
>> >> > times>, __ss_align = 0}, salen = 128}
>> >> > local_sigjmp_buf = {{__jmpbuf = {24482792,
>> 7991924142289912070,
>> >> > 211, 0, 139985774064536, 1, -7993048770381283066,
>> 7991923603094831366},
>> >> > __mask_was_saved = 1, __saved_mask = {__val = {0, 140728838264384,
>> >> > 139985973211296, 140728838264848, 5212294,
>> >> 140728838264400,
>> >> > 139985969563067, 42949672960, 680, 140728838264368, 0, 5085120, 0,
>> >> > 140724603453444, 3440, 5085122}}}}
>> >> > backend = 0x0
>> >> > now = {tv_sec = 1650390758, tv_usec = 681992}
>> >> > tz = {tz_minuteswest = 0, tz_dsttime = 0}
>> >> > connections_count = 0
>> >> > psbuf =
>> >> >
>> >>
>> "|\022y\001\000\000\000\000\370\026j\374\375\177\000\000\b\026j\374\375\177\000\000|\022y\001\000\000\000\000\020\027j\374\375\177\000\000
>> >> > \027j\374\375\177\000\000\002@
>> >>
>> \021\006Q\177\000\000W\323\377\005Q\177\000\000\001\200\255\373\000\000\377\000}\022y\001\000\000\000\000}\022y\001\000\000\000\000|\022y\001\000\000\000\000|\022y\001\000\000\000\000|\022y\001\000\000\000\000|\022y\001\070\067\066\063`\025j\374\375\177\000\000:xu\001\000\000\000\000`\025j\374\375\177\000\000\300\227M\000\000\000\000\000
>> >> >
>> >>
>> \027j\374\375\177\000\000\001\000\000\000\000\000\000\000\335\003\000\000\000\000\000\000:xu\001\000\000\000\000\065\022\n\006Q\177\000\000\001\200\255\373\060\060\060\060"...
>> >> > proc_info = <optimized out>
>> >> > walk = <optimized out>
>> >> > #1 0x000000000040b7e5 in fork_a_child (fds=0x17593e0, id=211) at
>> >> > main/pgpool_main.c:686
>> >> > pid = 0
>> >> > #2 0x000000000040c2a3 in reaper () at main/pgpool_main.c:2509
>> >> > new_pid = 0
>> >> > shutdown_system = 0 '\000'
>> >> > restart_child = 1 '\001'
>> >> > found = 1 '\001'
>> >> > process_health_check = 0 '\000'
>> >> > pid = 9100
>> >> > status = 256
>> >> > i = 211
>> >> > #3 0x0000000000412d7d in PgpoolMain
>> (discard_status=discard_status at entry
>> >> =0
>> >> > '\000', clear_memcache_oidmaps=clear_memcache_oidmaps at entry=0
>> '\000') at
>> >> > main/pgpool_main.c:477
>> >> > i = 2
>> >> > local_sigjmp_buf = {{__jmpbuf = {1, 7991926004629963014, 9898,
>> >> > 140728838265744, 5, 1, -7993048769884258042, 7991923584716177670},
>> >> > __mask_was_saved = 1, __saved_mask = {__val = {18446744066192964103,
>> 0,
>> >> > 139986006267048, 140728838265648, 140728838265632,
>> >> > 461466061, 4204876, 4294967295, 139985969301896, 139985969290592,
>> >> > 139986006197448, 5080360, 18446744073709551615, 0, 0, 4693792}}}}
>> >> > first = 0 '\000'
>> >> > #4 0x0000000000409b4a in main (argc=<optimized out>, argv=<optimized
>> >> out>)
>> >> > at main/main.c:365
>> >> > opt = <optimized out>
>> >> > debug_level = <optimized out>
>> >> > optindex = 0
>> >> > discard_status = 0 '\000'
>> >> > clear_memcache_oidmaps = 0 '\000'
>> >> > pcp_conf_file_path = "/etc/pgpool-II/pcp.conf", '\000'
>> <repeats
>> >> > 8169 times>
>> >> > conf_file_path = "/etc/pgpool-II/pgpool.conf", '\000' <repeats
>> >> 8166
>> >> > times>
>> >> > hba_file_path = "/etc/pgpool-II/pool_hba.conf", '\000'
>> <repeats
>> >> > 8164 times>
>> >> > pool_passwd_key_file_path = "/var/lib/pgsql/.pgpoolkey\000
>> >> >
>> >>
>> \000\000\000\000\000\002\000\000\000\006\000\000\000\270\r\006\000\000\000\000\000\270\r&\000\000\000\000\000\270\r&\000\000\000\000\000\340\001\000\000\000\000\000\000\340\001\000\000\000\000\000\000\b\000\000\000\000\000\000\000\004\000\000\000\004\000\000\000\310\001\000\000\000\000\000\000\310\001\000\000\000\000\000\000\310\001\000\000\000\000\000\000$\000\000\000\000\000\000\000$\000\000\000\000\000\000\000\004\000\000\000\000\000\000\000P\345td\004\000\000\000\340\321\005\000\000\000\000\000\340\321\005\000\000\000\000\000\340\321\005\000\000\000\000\000\344\004\000\000\000\000\000\000\344\004\000\000\000\000\000\000\004\000\000\000\000\000\000\000"...
>> >> > long_options = {{name = 0x4d87d6 "hba-file", has_arg = 1,
>> flag =
>> >> > 0x0, val = 97}, {name = 0x4d87df "debug", has_arg = 0, flag = 0x0,
>> val =
>> >> > 100}, {name = 0x4d87e5 "config-file", has_arg = 1, flag = 0x0, val =
>> >> 102},
>> >> > {name = 0x4d87f1 "key-file", has_arg = 1, flag = 0x0, val =
>> >> 107},
>> >> > {name = 0x4d87fa "pcp-file", has_arg = 1, flag = 0x0, val = 70},
>> {name =
>> >> > 0x4d8803 "help", has_arg = 0, flag = 0x0, val = 104}, {
>> >> > name = 0x4deab0 "mode", has_arg = 1, flag = 0x0, val =
>> 109},
>> >> > {name = 0x4d8808 "dont-detach", has_arg = 0, flag = 0x0, val = 110},
>> >> {name
>> >> > = 0x4d8814 "discard-status", has_arg = 0, flag = 0x0, val = 68}, {
>> >> > name = 0x4d8823 "clear-oidmaps", has_arg = 0, flag = 0x0,
>> >> val =
>> >> > 67}, {name = 0x4d8831 "debug-assertions", has_arg = 0, flag = 0x0,
>> val =
>> >> > 120}, {name = 0x4ed79c "version", has_arg = 0, flag = 0x0, val =
>> 118}, {
>> >> > name = 0x0, has_arg = 0, flag = 0x0, val = 0}}
>> >>
>>
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