@paride I'm seeing cca 20 wakeups/s in eventstat and strace shows some
nanosleeps and epoll_waits which I think is the modern equivalent of
pselect6.
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@Tomas: what can you reproduce exactly? The rapid system wakeup events
or the strace output with the pselect6 calls specifically?
@Colin: how did you capture that strace? On my Hirsute system I tried
$ sudo strace -fp -s 1000
and I can see a lot of events but not the pselect6 calls, see [1]
It's definitely reproducible with the latest 1.4.3~ds1-1 in Debian so I
don't think it's likely to be fixed in other versions either.
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https://bugs.launchpad.net/bugs/1826684
Title:
Hi Colin,
Sorry for the long delay, but could you please try to update to version
1.3.3-0ubuntu1~19.10.2 available in eoan-updates (or move to Focal) and
confirm if this new version is still affected by this bug? I tried to
reproduce it using a container and I have not faced the issue you
Hrm, can't find the debug symbols package for containderd, attached gdb
to the busy thread and observed:
0x555dbb5d3913 in runtime.futex ()
(gdb) where
#0 0x555dbb5d3913 in runtime.futex ()
#1 0x555dbb59f650 in runtime.futexsleep ()
#2 0x555dbcfa5010 in runtime.sched ()
#3
Ubuntu Eoan, containerd 1.2.6-0ubuntu1
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https://bugs.launchpad.net/bugs/1826684
Title:
containerd is polling on a pselect every 20,000 nanoseconds causing
rapid system wakeup events
This should probably be reported upstream at
https://github.com/containerd/containerd/issues, although it's possible
that there is some flag or other we could be passing when building that
affects this behaviour.
It's not obvious to me how containerd is calling pselect6. Can you get a
backtrace
** Summary changed:
- containerd is polling on a pselect ever 20,000 nanoseconds causing rapid
system wakeup events
+ containerd is polling on a pselect every 20,000 nanoseconds causing rapid
system wakeup events
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