I found an issue with the image I've been cloning test VMs from which
may have affected test results. I've got my own kernel builds set up now
and am rerunning the bisect. Will let you know what I find.
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So, I've had an exciting evening armed with ftrace and a kernel
debugger. I'm questioning my own sanity a bit here, but I'm fairly sure
at this point that setting ftrace going and loading the kernel debugging
module (I'm using kgdboe here because I'm on AWS) stop whatever the
issue is from happenin
I can't reproduce with the older version of udev either. However, I
think this is still a kernel issue, apparently triggered by an
interaction with a recent change in udev. Finding the change to udev
that causes this could be instructive for figuring out what the
underlying kernel issue is, but I d
For clarity here: I have not tested 15.04 and I can entirely believe
that the issue doesn't appear on that version. I'm testing the specified
kernel versions on Ubuntu 15.10 and the issue is reliably reproducible.
It doesn't seem to depend on whether swap is enabled or how full the RAM
is; large (~
I've found that how easy it is to reproduce varies somewhat - some
versions it's triggered at almost any file manipulation, others I've had
to copy a couple of large files around at the same time or otherwise
increase disk access while moving large files - but I can reproduce it
absolutely consiste
Crashed again.
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https://bugs.launchpad.net/bugs/1518457
Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
In Progress
Bug description:
As per bug 72189
Crashed again.
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Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
In Progress
Bug description:
As per bug 72189
Crashed again.
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Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
In Progress
Bug description:
As per bug 72189
Crashed again.
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Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
In Progress
Bug description:
As per bug 72189
Crashed again.
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https://bugs.launchpad.net/bugs/1518457
Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
In Progress
Bug description:
As per bug 72189
Crashed again.
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Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
In Progress
Bug description:
As per bug 72189
That version has also crashed.
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Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
In Progress
Bug description:
Same crash on that version.
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Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
In Progress
Bug description:
As
It's crashing on boot with this version. It's related to paging, so it
might be relevant to the issue, so I've attached the full dmesg and
here's the actual crash:
[3.716345] BUG: unable to handle kernel paging request at 60ffc0002370
[3.720056] IP: [] mem_cgroup_move_account+0xd1/0x25
No bug in that version.
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https://bugs.launchpad.net/bugs/1518457
Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
In Progress
Bug description:
As per
Bug is present in this version.
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https://bugs.launchpad.net/bugs/1518457
Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
In Progress
Bug description:
No bug in that version.
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https://bugs.launchpad.net/bugs/1518457
Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
In Progress
Bug description:
As per
Bug is present in this version.
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Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
Triaged
Bug description:
As
No bug on that version.
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https://bugs.launchpad.net/bugs/1518457
Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
Triaged
Bug description:
As per bug
No bug on that version.
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Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
Triaged
Bug description:
As per bug
3.12 final doesn't exhibit the issue either.
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Title:
kswapd0 100% CPU usage
Status in linux package in Ubuntu:
Triaged
Bug descr
Okay, I cloned my server and tried kernel versions. The latest version
which does _not_ exhibit the issue is 3.12.51. The first which does is
3.13-rc1.
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This was a clean build, so I don't have any information about previous
versions unfortunately. (The previous server, which didn't have this
issue, was different AWS hardware and the previous Ubuntu version.)
I've tested with the latest mainline kernel and this is still occurring.
** Changed in: l
Public bug reported:
As per bug 721896 and various others:
I'm on an AWS t2.micro instance (Xeon E5-2670, 991MiB of memory).
Occasionally (about once a day), kswapd0 falls into a busy loop and
spins on 100% CPU usage indefinitely. This can be provoked by
copying/writing large files (e.g. dding a
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