Public bug reported:
Summary
The nginx-extras package version 1.24.0-2ubuntu7.10 (Noble) ships a bundled
nchan module that causes nginx workers to segfault with signal 11 immediately
on startup, even when nchan is not configured in any site.
Steps to reproduce
1. Install nginx-extras on Ubuntu 24.04
2. Ensure /etc/nginx/modules-enabled/50-mod-nchan.conf is present (default
after install)
3. Do NOT add any nchan_* directives to any site config
4. Start or restart nginx
5. Observe workers crashing with signal 11 in /var/log/nginx/error.log
Expected behaviour
Modules included in nginx-extras should be compatible with the nginx binary
in the same package version. A loaded-but-unconfigured module should not crash
workers.
Actual behaviour
Every nginx worker exits on signal 11 seconds after startup:
[alert] worker process XXXX exited on signal 11
Impact
- All HTTP/2 connections are dropped on each worker crash
- Site appears completely down to users
- The previous version (1.24.0-2ubuntu7.9) had no such issue — this is a
regression introduced in 2ubuntu7.10
Workaround
Remove /etc/nginx/modules-enabled/50-mod-nchan.conf to stop loading the nchan
module.
System info
- Ubuntu 24.04 LTS (Noble)
- nginx 1.24.0-2ubuntu7.10
- nginx-extras 1.24.0-2ubuntu7.10
- Upgraded automatically via unattended-upgrades
** Affects: nginx (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2156016
Title:
nginx-extras 1.24.0-2ubuntu7.10 ships nchan module that segfaults
nginx workers on load
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