Can confirm, this bug is still a reality in Ubuntu 20.04 (focal) and is triggered by two reloads in a row.
root@nginx:~# ps aux|grep nginx root 3356067 0.0 0.1 71600 9788 ? Ss 15:46 0:00 nginx: master process /usr/sbin/nginx -g daemon on; master_process on; www-data 3356068 0.0 0.1 73012 15348 ? S 15:46 0:00 nginx: worker process www-data 3356069 0.0 0.1 73012 15348 ? S 15:46 0:00 nginx: worker process www-data 3356070 0.0 0.1 73012 15348 ? S 15:46 0:00 nginx: worker process www-data 3356071 0.0 0.1 73012 15348 ? S 15:46 0:00 nginx: worker process www-data 3356072 0.0 0.1 73012 15348 ? S 15:46 0:00 nginx: worker process www-data 3356073 0.0 0.1 73012 15348 ? S 15:46 0:00 nginx: worker process www-data 3356074 0.0 0.1 73012 15348 ? S 15:46 0:00 nginx: worker process www-data 3356075 0.0 0.1 73012 15348 ? S 15:46 0:00 nginx: worker process root 3356102 0.0 0.0 8900 676 pts/0 S+ 15:46 0:00 grep --color=auto nginx root@nginx:~# service nginx reload root@nginx:~# ps aux|grep nginx root 3356067 0.2 0.3 81404 28848 ? Ss 15:46 0:00 nginx: master process /usr/sbin/nginx -g daemon on; master_process on; www-data 3356266 0.0 0.2 81644 22608 ? S 15:46 0:00 nginx: worker process www-data 3356267 0.0 0.2 81644 22608 ? S 15:46 0:00 nginx: worker process www-data 3356268 0.0 0.2 81644 22608 ? S 15:46 0:00 nginx: worker process www-data 3356269 0.0 0.2 81644 22608 ? S 15:46 0:00 nginx: worker process www-data 3356270 0.0 0.2 81644 22608 ? S 15:46 0:00 nginx: worker process www-data 3356271 0.0 0.2 81644 22608 ? S 15:46 0:00 nginx: worker process www-data 3356272 0.0 0.2 81644 22608 ? S 15:46 0:00 nginx: worker process www-data 3356273 0.0 0.2 81644 22608 ? S 15:46 0:00 nginx: worker process root 3356296 0.0 0.0 17196 7168 ? R 15:46 0:00 /usr/bin/pgrep nginx root 3356309 0.0 0.0 8900 736 pts/0 S+ 15:46 0:00 grep --color=auto nginx root@nginx:~# service nginx reload root@nginx:~# ps aux|grep nginx root 3356355 0.0 0.0 8900 736 pts/0 S+ 15:46 0:00 grep --color=auto nginx At the time of the second reload, the following segfault is logged in /var/log/kern.log: May 4 15:46:50 onl-paylb02-p kernel: [4141537.262674] nginx[3356067]: segfault at 51 ip 00007f6b7d1535c9 sp 00007ffe634334d0 error 4 in libperl.so.5.30.0[7f6b7d0eb000+166000] May 4 15:46:50 onl-paylb02-p kernel: [4141537.262681] Code: 00 0f b6 40 30 49 c1 ed 03 49 29 c5 0f 84 17 01 00 00 48 8b 76 10 48 8b 52 10 4c 8d 3c fe 4c 8d 0c c2 84 c9 0f 84 c7 02 00 00 <49> 83 39 00 0f 85 ad 03 00 00 49 83 c1 08 49 83 ed 01 49 8d 74 1d -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to perl in Ubuntu. https://bugs.launchpad.net/bugs/1897561 Title: libperl.so.5.30.0 causes nginx to segfault Status in perl package in Ubuntu: Confirmed Bug description: [Steps to reproduce] 1) launch a focal container $ lxc launch images:ubuntu/focal focal-1897561 2) enter the container $ lxc shell focal-1897561 3) install libnginx-mod-http-perl # apt-get install -y nginx-core libnginx-mod-http-perl 4) check nginx journal # journalctl -fu nginx & 5) reload nginx 2-3 times # systemctl reload nginx Eventually you will see this from the journal: Oct 13 17:13:34 focal-1897561 systemd[1]: Reloaded A high performance web server and a reverse proxy server. Oct 13 17:13:35 focal-1897561 systemd[1]: nginx.service: Main process exited, code=dumped, status=11/SEGV Oct 13 17:13:35 focal-1897561 systemd[1]: nginx.service: Killing process 588 (nginx) with signal SIGKILL. Oct 13 17:13:35 focal-1897561 systemd[1]: nginx.service: Killing process 589 (nginx) with signal SIGKILL. Oct 13 17:13:35 focal-1897561 systemd[1]: nginx.service: Killing process 588 (nginx) with signal SIGKILL. Oct 13 17:13:35 focal-1897561 systemd[1]: nginx.service: Killing process 589 (nginx) with signal SIGKILL. Oct 13 17:13:35 focal-1897561 systemd[1]: nginx.service: Failed with result 'core-dump'. [Workaround] If libnginx-mod-http-perl is not needed, purging it and restarting nginx sidesteps the problem. [Original bug description] Ubuntu 20.04 LTS Looks that Perl 5.30 has bug that causes nginx to die, usually occurs after "service nginx reload" This looks like nginx, but it really is perl issue: https://github.com/Perl/perl5/issues/17154 Fix done in 5.32 (Perl5 commit ffffbf0) and people are asking backport to 5.30 to get fix also to nginx. Error: Sep 28 07:39:43 host kernel: [1340832.811014] nginx[3253005]: segfault at 10 ip 00007fbf3220d593 sp 00007ffd6bba6260 error 4 in libperl.so.5.30.0[7fbf321a5000+166000] Symptom: Nginx terminates --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu27.9 Architecture: amd64 CasperMD5CheckResult: skip DistroRelease: Ubuntu 20.04 Package: perl 5.30.0-9build1 PackageArchitecture: amd64 ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44 Tags: focal uec-images Uname: Linux 5.4.0-42-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: N/A _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/perl/+bug/1897561/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
