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    SubjectRe: Perf hotplug lockup in v4.9-rc8
    On Wed, Dec 07, 2016 at 02:30:58PM +0000, Mark Rutland wrote:
    > On Wed, Dec 07, 2016 at 01:52:17PM +0000, Mark Rutland wrote:
    > > Hi all
    > >
    > > Jeremy noticed a kernel lockup on arm64 when the perf tool was used in
    > > parallel with hotplug, which I've reproduced on arm64 and x86(-64) with
    > > v4.9-rc8. In both cases I'm using defconfig; I've tried enabling lockdep
    > > but it was silent for arm64 and x86.
    > >
    > > I haven't yet tested earlier kernels and I'm not sure how long this has
    > > been around for; I'm currently building a v4.8 defconfig to compare
    > > with. In the meantime, info dump below.
    >
    > On v4.8 it hangs on x86, but my SSH session survived. Log below; I'll
    > give v4.7 a go...

    It seems the lockup has been around at least since v4.6, so I'll give up
    trying to find a point when it didn't exist.

    Peter had some ideas over IRC, so I'll give those a go atop of v4.9-rc8.

    Thanks,
    Mark.

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