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

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Hi Ming,

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.

I've seen issues with the LSE atomics on the Thunder platform -- can you
try disabling those (CONFIG_ARM64_LSE_ATOMICS) and see if the problem
persists, please?

Will

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[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

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