Public bug reported:
After the nginx security update on June 5th 2026 (1.24.0-2ubuntu7.10), nginx
worker
processes began segfaulting repeatedly on Ubuntu 24.04 Noble running
nginx-extras.
Environment:
- Ubuntu 24.04 Noble
- nginx-extras 1.24.0-2ubuntu7.10 (updated June 5th 2026)
- libnginx-mod-nchan 1:1.3.6+dfsg-4build1 (noble, not updated with nginx)
Symptom:
Nginx worker processes crash repeatedly with signal 11 (segfault), visible in
/var/log/nginx/error.log:
alert: worker process XXXX exited on signal 11 (core dumped)
The kernel log confirms the segfault location:
nginx[PID]: segfault at 19 ip 00005f1a33094623 sp 00007ffc6b3f1b18 error 4 in
nginx
This caused all nginx-proxied services to become intermittently
unreachable.
Root cause:
libnginx-mod-nchan was not updated alongside the June 5th nginx security
update,
causing an incompatibility between the new nginx version and the nchan module.
Fix:
Disabling or removing libnginx-mod-nchan stops the crashes immediately:
sudo mv /etc/nginx/modules-enabled/50-mod-nchan.conf /tmp/
sudo systemctl restart nginx
Or:
sudo apt remove libnginx-mod-nchan
nginx workers no longer segfault after nchan is disabled.
Workaround: remove or disable libnginx-mod-nchan until the package is updated
to be compatible with nginx 1.24.0-2ubuntu7.10.
** Affects: nginx (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2156306
Title:
nginx-extras segfaults after June 5th security update due to
incompatible libnginx-mod-nchan
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