* Re: [Bug 190191] New: kswapd0 spirals out of control
[not found] <bug-190191-27@https.bugzilla.kernel.org/>
@ 2017-01-05 19:42 ` Andrew Morton
2017-01-06 10:18 ` Michal Hocko
0 siblings, 1 reply; 2+ messages in thread
From: Andrew Morton @ 2017-01-05 19:42 UTC (permalink / raw)
To: linux-mm; +Cc: bugzilla-daemon, dh
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
On Mon, 12 Dec 2016 19:38:23 +0000 bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=190191
>
> Bug ID: 190191
> Summary: kswapd0 spirals out of control
> Product: Memory Management
> Version: 2.5
> Kernel Version: 4.8.0+
> Hardware: i386
> OS: Linux
> Tree: Mainline
> Status: NEW
> Severity: high
> Priority: P1
> Component: Other
> Assignee: akpm@linux-foundation.org
> Reporter: dh@kernel.usrbin.org
> Regression: No
I'd say "Regression: yes".
Additional details at the link. There's no indication which commit(s)
broke it.
> Created attachment 247481
> --> https://bugzilla.kernel.org/attachment.cgi?id=247481&action=edit
> config for 4.7
>
> I'm currently running 4.7.10 with no problems, but when i tried to upgrade to
> 4.8.0 (and just now, 4.9.0) i encountered a problem that makes my system
> unusable.
>
> When running certain jobs, kswapd0 will consume more and more cpu cycles until
> `top' lists it at 100% and everything else slows to a crawl and makes the
> system almost completely unresponsive.
>
> The main time i notice this is when running big rsync jobs between my
> computers, which i do regularly (masochistic homebrew packaging system, don't
> ask).
>
> `free' never indicates any swap usage while this is going on; the systems have
> 4GB and 8GB of memory respectively and neither is getting filled up.
>
> I've never seen this problem before and i've been running self-compiled kernels
> early in the 2.x days.
>
> `echo 1 > /proc/sys/vm/drop_caches' works to clear the logjam, but then it just
> happens again in short order.
>
> I'm attaching my .config for 4.7 and 4.9, in case this has something to do with
> my configuration options.
>
> Sorry this isn't very precise, but i'm not sure how to further debug this and
> don't have a strong enough understanding of the systems involved to know what
> to provide. If i can try anything to help pinpoint the issue, please let me
> know!
>
> --
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> You are the assignee for the bug.
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^ permalink raw reply [flat|nested] 2+ messages in thread