We are seeing what looks like the same regression, but with another
dynamic module: ngx_http_uploadprogress_module.
Environment:
- Ubuntu 24.04
- nginx / nginx-extras 1.24.0-2ubuntu7.10
- package/module involved: libnginx-mod-http-uploadprogress /
ngx_http_uploadprogress_module.so
Symptoms:
- Static video files started to fail during download/playback.
- Firefox reports NS_ERROR_NET_PARTIAL_TRANSFER.
- curl also shows partial transfers / connection reset while downloading the
same files.
- nginx workers repeatedly crash with signal 11.
Important detail:
The uploadprogress directives were not actually used in our nginx
configuration. The module was only loaded dynamically from
/etc/nginx/modules-enabled/.
Backtrace from the nginx worker core dump pointed to
ngx_http_uploadprogress_module.so, with the crash going through
ngx_strncasecmp() and ngx_http_core_rewrite_phase().
Workaround:
Disabling the dynamic module fixed the issue immediately:
mv /etc/nginx/modules-enabled/50-mod-http-uploadprogress.conf \
/etc/nginx/modules-enabled/50-mod-http-uploadprogress.conf.disabled
nginx -t
systemctl reload nginx
After unloading ngx_http_uploadprogress_module, nginx workers stopped
crashing and video/static file transfers completed normally again.
This suggests that the regression is not limited to the module already
mentioned in this bug. At least ngx_http_uploadprogress_module can also
trigger nginx worker segfaults with nginx/nginx-extras
1.24.0-2ubuntu7.10 on Ubuntu 24.04.
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https://bugs.launchpad.net/bugs/2155992
Title:
headers-more dynamic module crash
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