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    SubjectRe: frequent lockups in 3.18rc4
    On 12/11/2014 05:57 PM, Sasha Levin wrote:
    > On 12/11/2014 05:36 PM, Linus Torvalds wrote:
    >> > On Thu, Dec 11, 2014 at 1:52 PM, Sasha Levin <sasha.levin@oracle.com> wrote:
    >>>> >> >
    >>>> >> > Is it possible that Dave and myself were seeing the same problem after
    >>>> >> > all?
    >> > Could be. You do have commonalities, even if the actual symptoms then
    >> > differ. And while it looked different when you could trigger it with
    >> > 3.16 but DaveJ couldn't, that's up in the air now that I doubt that
    >> > 3.16 really is ok for DaveJ after all..
    >> >
    >> > And you might have a better luck bisecting it, since you seem to be
    >> > able to trigger your RCU lockup much more quickly (and apparently
    >> > reliably? Correct?)
    > Right, and it reproduces in 3.10 as well, so it's not really a new thing.
    >
    > What's odd is that I don't remember seeing this bug so long in the past,
    > I'll try bisecting trinity rather than the kernel - it's the only other
    > thing that changed.

    So I checked out trinity from half a year ago, and could not reproduce the
    stall any more. Not on v3.16 nor on the current -next.

    I ran bisection on trinity, rather than the kernel, and got the following
    result:

    commit f2be2d5ffe4bf896eb5418972013822a2bef0cee
    Author: Dave Jones <davej@redhat.com>
    Date: Mon Aug 4 19:55:17 2014 -0400

    begin some infrastructure to use a bunch of test files for fsx like ops.

    I've been running trinity f2be2d5ff^ on -next for two hours now, and there's
    no sign of a lockup. Previously it took ~10 minutes trigger.


    Thanks,
    Sasha


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