[pgpool-general: 8090] Re: PgPool 4.3.1 segfaults
Tatsuo Ishii
ishii at sraoss.co.jp
Wed Apr 20 13:27:06 JST 2022
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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