Am Montag, dem 12.04.2021 um 21:13 +0200 schrieb Eduard Bloch:
> Hallo,
> * Christian Meyer [Sun, Apr 11 2021, 01:26:01PM]:
> > Package: apt-cacher-ng
> > Version: 3.6.3-1
> > Severity: important
> > X-Debbugs-Cc: c2h...@web.de
>
> What you describe here does, all in one, not make much sense. Too
> many symptoms coming together which are not adding up. Are you sure
> that there is no bad memory or system instability involved?

Until now I have no hint to that direction, but I will test memory and
/ or replace the machine.

> Please send the output of
> journalctl -b0 -u apt-cacher-ng

For today (and cron driven restarts on errors every 3 minutes) it is:

Apr 13 07:57:37 121-My apt-cacher-ng[202463]: [warn] Epoll ADD(1) on fd
13 failed. Old events were 0; read change was 1 (add); write change was
0 (none); close change was 0 (none): Bad file descriptor
Apr 13 08:00:02 121-My systemd[1]: Stopping Apt-Cacher NG software
download proxy...
Apr 13 08:00:02 121-My systemd[1]: apt-cacher-ng.service: Succeeded.
Apr 13 08:00:02 121-My systemd[1]: Stopped Apt-Cacher NG software
download proxy.
Apr 13 08:00:02 121-My systemd[1]: apt-cacher-ng.service: Consumed
55.182s CPU time.
Apr 13 08:00:02 121-My systemd[1]: Starting Apt-Cacher NG software
download proxy...
Apr 13 08:00:02 121-My systemd[1]: Started Apt-Cacher NG software
download proxy.
Apr 13 08:00:40 121-My apt-cacher-ng[389015]: [warn] Epoll ADD(1) on fd
13 failed. Old events were 0; read change was 1 (add); write change was
0 (none); close change was 0 (none): Bad file descriptor
Apr 13 08:03:02 121-My systemd[1]: Stopping Apt-Cacher NG software
download proxy...
Apr 13 08:03:02 121-My systemd[1]: apt-cacher-ng.service: Succeeded.
Apr 13 08:03:02 121-My systemd[1]: Stopped Apt-Cacher NG software
download proxy.
Apr 13 08:03:02 121-My systemd[1]: apt-cacher-ng.service: Consumed
2.402s CPU time.
Apr 13 08:03:02 121-My systemd[1]: Starting Apt-Cacher NG software
download proxy...
Apr 13 08:03:02 121-My systemd[1]: Started Apt-Cacher NG software
download proxy.
Apr 13 10:42:12 121-My apt-cacher-ng[391899]: [warn] Epoll ADD(1) on fd
13 failed. Old events were 0; read change was 1 (add); write change was
0 (none); close change was 0 (none): Bad file descriptor
Apr 13 10:43:25 121-My apt-cacher-ng[391899]: [warn] Epoll ADD(1) on fd
13 failed. Old events were 0; read change was 1 (add); write change was
0 (none); close change was 0 (none): Bad file descriptor
Apr 13 10:45:02 121-My systemd[1]: Stopping Apt-Cacher NG software
download proxy...
Apr 13 10:45:02 121-My systemd[1]: apt-cacher-ng.service: Succeeded.
Apr 13 10:45:02 121-My systemd[1]: Stopped Apt-Cacher NG software
download proxy.
Apr 13 10:45:02 121-My systemd[1]: apt-cacher-ng.service: Consumed
56.112s CPU time.
Apr 13 10:45:02 121-My systemd[1]: Starting Apt-Cacher NG software
download proxy...
Apr 13 10:45:02 121-My systemd[1]: Started Apt-Cacher NG software
download proxy.
Apr 13 11:36:26 121-My apt-cacher-ng[414217]: [warn] Epoll ADD(1) on fd
13 failed. Old events were 0; read change was 1 (add); write change was
0 (none); close change was 0 (none): Bad file descriptor
Apr 13 11:39:02 121-My systemd[1]: Stopping Apt-Cacher NG software
download proxy...
Apr 13 11:39:02 121-My systemd[1]: apt-cacher-ng.service: Succeeded.
Apr 13 11:39:02 121-My systemd[1]: Stopped Apt-Cacher NG software
download proxy.
Apr 13 11:39:02 121-My systemd[1]: apt-cacher-ng.service: Consumed 2min
47.837s CPU time.
Apr 13 11:39:02 121-My systemd[1]: Starting Apt-Cacher NG software
download proxy...
Apr 13 11:39:02 121-My systemd[1]: Started Apt-Cacher NG software
download proxy.


> and also please set debug=7 in acng.conf or similar conf file.

I did so an now I'm waiting for new errors.

> If that's a crash, please install systemd-coredump service and we can
> debug the corefiles later.


> Oh, that's probably our "nice" apt hiding the actual error string and
> showing this dummy instead. It should match some error in the error
> log,
> though.
>
> This doesn't make sense. ACNG does not render this message string
> explicitly.
> Is there some proxy server involved?


Yes, there is an elderly squid upstream proxy:
Proxy: http://user:pass@myProxy:8080
and I
ReuseConnections: 0

These are tho only modifications of the config-file



> > my workaround is to automatically restart the service by a cronjob
> > (and after that /usr/lib/apt-cacher-ng/expire-caller.pl) when this
> > line is seen.
>
> And now that is getting really odd. Do you have some kind of
> application
> firewall installed, like apparmor?

I didn't install (or configure) it by hand, but obviously it is pulled
in by $something in Bullseye:

At least 'dpkg -i apparmor' says something like:

ii  apparmor                2.13.6-10    amd64        user-space parser
utility for AppArmor
un  apparmor-profiles-extra <keine>      <keine>      (keine
Beschreibung vorhanden)
un  apparmor-utils          <keine>      <keine>      (keine
Beschreibung vorhanden)


> We can have an interactive Jitsi session if you prefer to get this
> solved in realtime and it can be made reproducible somehow.

Thanks for your offer.
Actually I don't see a way to reproduce it by demand.

I will have a look at the memory (memtest) and report the 'debug: 7'
output in apt-cacher-ng.err

Christian

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