Re: Help with systemd/cgroup task limits in koji

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On Thu, Feb 23, 2023 at 11:11:49AM +0100, Florian Weimer wrote:
> * Giuseppe Scrivano:
> 
> > Florian Weimer <fweimer@xxxxxxxxxx> writes:
> >> It could be an old kernel bug:
> >>
> >>   Task exit is signaled before task resource deallocation, leading to
> >>   bogus EAGAIN errors
> >>   <https://bugzilla.kernel.org/show_bug.cgi?id=154011>
> >>
> >> There have been recent namespace optimizations which introduce a similar
> >> pattern there.  While they improve throughput in many cases, continuous
> >> allocation and deallocation can now fail, even though the program logic
> >> ensures that resources are never exceeded.
> >>
> >> Guiseppe, any suggestions how to debug this?
> >
> > the only optimization I am aware of that could cause a similar issue is
> > the delayed IPC namespace cleanup.  That would cause the IPC namespace
> > creation to fail though, not posix_spawn.
> >
> > If you believe the failure can be related to reaching the pids limit for
> > the cgroup, could you please check the actual limit inside the
> > container?  You could check the value of /sys/fs/cgroup/pids.max inside
> > the container (assuming cgroupv2 and a cgroup namespace for the container).
> >
> > Please let me know if that helps.
> 
> (replying for the benefit of the list)

Than: could you try some chromium builds with a cat of that value at
various points? (ie, prep, build, etc?)

kevin
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