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Groups > linux.kernel > #1536775

Re: bio linked list corruption.

From Vegard Nossum <vegard.nossum@gmail.com>
Newsgroups linux.kernel
Subject Re: bio linked list corruption.
Date 2016-12-06 09:50 +0100
Message-ID <sLjBL-8aU-21@gated-at.bofh.it> (permalink)
References (14 earlier) <sL5Iu-7AR-11@gated-at.bofh.it> <sL6XT-81-3@gated-at.bofh.it> <sL7TY-KS-7@gated-at.bofh.it> <sL8dj-QU-19@gated-at.bofh.it> <sL99o-1pH-39@gated-at.bofh.it>
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On 5 December 2016 at 22:33, Vegard Nossum <vegard.nossum@gmail.com> wrote:
> On 5 December 2016 at 21:35, Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
>> Note for Ingo and Peter: this patch has not been tested at all. But
>> Vegard did test an earlier patch of mine that just verified that yes,
>> the issue really was that wait queue entries remained on the wait
>> queue head just as we were about to return and free it.
>
> The second patch has been running for 1h+ without any problems of any
> kind. I should typically have seen 2 crashes by now. I'll let it run
> overnight to be sure.

Alright, so nearly 12 hours later I don't see either the new warning
or the original crash at all, so feel free to add:

Tested-by: Vegard Nossum <vegard.nossum@oracle.com>.

That said, my 8 VMs had all panicked in some way due to OOMs (which is
new since v4.8), although some got page allocation stalls for >20s and
died because "khugepaged blocked for more than 120 seconds", others
got "Out of memory and no killable processes".


Vegard

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Thread

Re: bio linked list corruption. Vegard Nossum <vegard.nossum@gmail.com> - 2016-12-05 00:10 +0100
  Re: bio linked list corruption. Vegard Nossum <vegard.nossum@gmail.com> - 2016-12-05 18:20 +0100
    Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-12-05 18:30 +0100
    Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-12-05 19:00 +0100
      Re: bio linked list corruption. Vegard Nossum <vegard.nossum@gmail.com> - 2016-12-05 20:20 +0100
        Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-12-05 21:20 +0100
          Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-12-05 21:40 +0100
            Re: bio linked list corruption. Vegard Nossum <vegard.nossum@gmail.com> - 2016-12-05 22:40 +0100
              Re: bio linked list corruption. Vegard Nossum <vegard.nossum@gmail.com> - 2016-12-06 09:50 +0100
            Re: bio linked list corruption. Peter Zijlstra <peterz@infradead.org> - 2016-12-06 09:20 +0100
              Re: bio linked list corruption. Ingo Molnar <mingo@kernel.org> - 2016-12-06 09:40 +0100
              Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-12-06 18:00 +0100
        Re: bio linked list corruption. Vegard Nossum <vegard.nossum@gmail.com> - 2016-12-05 21:20 +0100
  Re: bio linked list corruption. Andy Lutomirski <luto@kernel.org> - 2016-12-05 19:20 +0100
    Re: bio linked list corruption. Vegard Nossum <vegard.nossum@gmail.com> - 2016-12-05 19:30 +0100
    Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-12-05 19:30 +0100

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