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    SubjectRe: Current mainline git (24e700e291d52bd2) hangs when building e.g. perf
    On 2017.09.05 at 10:53 +0200, Peter Zijlstra wrote:
    > On Tue, Sep 05, 2017 at 09:27:38AM +0200, Markus Trippelsdorf wrote:
    > > Current mainline git (24e700e291d52bd2) hangs when building software
    > > concurrently (for example perf).
    > > The issue is not 100% reproducible (sometimes building perf succeeds),
    > > so bisecting will not work.
    >
    > Sadly I cannot reproduce, I had:
    >
    > while :; do make clean; make; done
    >
    > running on tools/perf for a while, and now have:
    >
    > while :; do make O=defconfig-build clean; make O=defconfig-build -j80; done
    >
    > running, all smooth sailing, although there's the hope that the moment I
    > hit send on this email the box comes unstuck.
    >
    > > Magic SysRq key doesn't work and there is nothing in the logs.
    > > Enabling CONFIG_PROVE_LOCKING makes the issue go away.
    >
    > SysRq not working is suspicious.. and I take it the NMI watchdog also
    > isn't firing?

    Yes.

    > > Any ideas on how to debug this further?
    >
    > So you have a (real) serial line on that box?

    Sadly, no. But hopefully somebody else (with a proper kernel debugging
    setup) will reproduce the issue soon.

    --
    Markus

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