Re: bio linked list corruption.

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: bio linked list corruption.
Date	2016-10-20 09:30 +0200
Message-ID	<sufXz-4qj-9@gated-at.bofh.it> (permalink)
References	(4 earlier) <stM9c-HJ-3@gated-at.bofh.it> <stMLT-1jl-5@gated-at.bofh.it> <su2xj-4eW-5@gated-at.bofh.it> <su3a2-4te-15@gated-at.bofh.it> <sufuy-3ZE-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, 20 Oct 2016, Ingo Molnar wrote:
> * Linus Torvalds <torvalds@linux-foundation.org> wrote:
> > So I don't think it's related. Yours looks like some subtle timer base
> > race. It smells like a locking problem with timers. I'm not seeing
> > what it might be, but it *might* have been fixed by doing the
> > TIMER_MIGRATING bit right in add_timer_on() (commit 22b886dd1018).

4.1 does not have the new fangled timer wheel. So 22b886dd1018 is
irrelevant.

> > Adding some timer people just in case, but I don't think your 4.1
> > report is related.

This looks like one of the classic issues where an enqueued timer gets
freed/reinitialized or otherwise manipulated. So yes, Ingos recommendation
for debugging is the right thing to do.

Thanks,

	tglx

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Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-19 00:50 +0200
  Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-19 01:40 +0200
    Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-19 02:20 +0200
      Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-19 02:30 +0200
        Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-21 00:50 +0200
      Re: bio linked list corruption. Andy Lutomirski <luto@kernel.org> - 2016-10-19 03:10 +0200
        Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-21 01:00 +0200
          Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-21 01:10 +0200
            Re: bio linked list corruption. Andy Lutomirski <luto@amacapital.net> - 2016-10-21 01:30 +0200
              Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-21 22:10 +0200
                Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-21 22:30 +0200
                Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-21 23:20 +0200
                Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-22 17:30 +0200
                Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-24 06:50 +0200
                Re: bio linked list corruption. Andy Lutomirski <luto@amacapital.net> - 2016-10-24 22:10 +0200
                Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-24 22:50 +0200
                Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-24 23:20 +0200
                Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-25 00:00 +0200
                Re: bio linked list corruption. Andy Lutomirski <luto@amacapital.net> - 2016-10-25 00:50 +0200
                Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-25 02:10 +0200
                Re: bio linked list corruption. Andy Lutomirski <luto@amacapital.net> - 2016-10-25 03:20 +0200
                Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-26 02:30 +0200
                Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-26 03:40 +0200
                Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-26 03:40 +0200
                Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-26 18:40 +0200
                Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-26 18:50 +0200
                Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-26 20:20 +0200
                Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-26 20:50 +0200
                Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-26 21:10 +0200
                Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-27 00:10 +0200
                Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-27 00:30 +0200
                Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-27 00:50 +0200
                Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-27 01:00 +0200
                Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-27 01:00 +0200
                Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-27 01:10 +0200
                Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-27 01:50 +0200
                Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-27 01:10 +0200
                Re: bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-27 01:10 +0200
          Re: bio linked list corruption. Andy Lutomirski <luto@amacapital.net> - 2016-10-21 01:10 +0200
    Re: bio linked list corruption. Philipp Hahn <pmhahn@pmhahn.de> - 2016-10-19 19:10 +0200
      Re: bio linked list corruption. Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-19 19:50 +0200
        Re: bio linked list corruption. Ingo Molnar <mingo@kernel.org> - 2016-10-20 09:00 +0200
          Re: bio linked list corruption. Thomas Gleixner <tglx@linutronix.de> - 2016-10-20 09:30 +0200

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