Public bug reported:
Hi there,
We have a frequent issue with apt-cacher-ng where it runs out of file
descriptors. This manifests as the following in the logs:
Tue May 19 06:04:14 2026|Error creating pipe file descriptors
Tue May 19 06:04:15 2026|PANIC! Error creating download job for
repo.mysql.com/apt/ubuntu/dists/noble/InRelease
After investigating this we've found that when a number of machines
attempt to connect to apt-cacher it will fail to properly close some
proportion of the TCP connections that get opened. Specifically, they
will get stuck in the `CLOSE_WAIT` state. These phantom connections
start to accumulate, and eventually result in the process running out of
file descriptors.
As a work around we've ended up increasing the file limit for the
process, but this is not ideal.
It would be good to try and get this resolved, and I'm happy to provide
more information if needed.
Cheers,
Luke
Installed version from dpkg:
ii apt-cacher-ng 3.7.4-1ubuntu5
amd64 caching proxy server for software repositories
** Affects: apt-cacher-ng (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2158593
Title:
apt-cacher-ng fd exhaustion due to unclosed TCP connections
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