Re: [bug report v4.8] fs/locks.c: kernel oops during posix lock stress test

From	Will Deacon <will.deacon@arm.com>
Newsgroups	linux.kernel
Subject	Re: [bug report v4.8] fs/locks.c: kernel oops during posix lock stress test
Date	2016-12-01 12:40 +0100
Message-ID	<sJxSx-3eG-5@gated-at.bofh.it> (permalink)
References	<sIkE1-4Vh-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Mon, Nov 28, 2016 at 11:10:14AM +0800, Ming Lei wrote:
> When I run stress-ng via the following steps on one ARM64 dual
> socket system(Cavium Thunder), the kernel oops[1] can often be
> triggered after running the stress test for several hours(sometimes
> it may take longer):
> 
> - git clone git://kernel.ubuntu.com/cking/stress-ng.git
> - apply the attachment patch which just makes the posix file
> lock stress test more aggressive
> - run the test via '~/git/stress-ng$./stress-ng --lockf 128 --aggressive'
> 
> 
> From the oops log, looks one garbage file_lock node is got
> from the linked list of 'ctx->flc_posix' when the issue happens.
> 
> BTW, the issue isn't observed on single socket Cavium Thunder yet,
> and the same issue can be seen on Ubuntu Xenial(v4.4 based kernel)
> too.

FWIW, I've been running this on Seattle for 24 hours with your patch applied
and not seen any problems yet. That said, Thomas did just fix an rt_mutex
race which only seemed to pop up on Thunder, so you could give those
patches a try.

  https://lkml.kernel.org/r/20161130205431.629977871@linutronix.de

Will

Thread

[bug report v4.8] fs/locks.c: kernel oops during posix lock stress test Ming Lei <ming.lei@canonical.com> - 2016-11-28 04:20 +0100
  Re: [bug report v4.8] fs/locks.c: kernel oops during posix lock  stress test Will Deacon <will.deacon@arm.com> - 2016-11-28 12:00 +0100
  Re: [bug report v4.8] fs/locks.c: kernel oops during posix lock  stress test Jeff Layton <jlayton@poochiereds.net> - 2016-11-28 14:50 +0100
    Re: [bug report v4.8] fs/locks.c: kernel oops during posix lock  stress test Ming Lei <ming.lei@canonical.com> - 2016-11-29 02:20 +0100
    Re: [bug report v4.8] fs/locks.c: kernel oops during posix lock  stress test Ming Lei <ming.lei@canonical.com> - 2016-12-08 17:20 +0100
  Re: [bug report v4.8] fs/locks.c: kernel oops during posix lock  stress test Will Deacon <will.deacon@arm.com> - 2016-12-01 12:40 +0100
    Re: [bug report v4.8] fs/locks.c: kernel oops during posix lock  stress test Ming Lei <ming.lei@canonical.com> - 2016-12-06 11:00 +0100

csiph-web