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    SubjectRe: soft lockup when passing vvar address to write(2)
    On Thu, Mar 3, 2016 at 2:58 PM, Rasmus Villemoes
    <linux@rasmusvillemoes.dk> wrote:
    > Looking up the vvar mapping and dumping its contents sometimes results
    > in a soft lockup. On 4.5-rc6+ (master from earlier today) it seems to be
    > a little harder to trigger than on the 4.2something Ubuntu kernel I
    > first saw it on, but in both cases it's easy to reproduce (10s of
    > iterations at most) by running the below program in a loop.
    >

    I can't reproduce this. Do you have a .config or some other hint?

    Can you also give me the contents of
    /sys/devices/system/clocksource/clocksource0/current_clocksource and
    the output from 'dmesg |grep -i hpet'? And is this in a VM or on a
    native boot?

    My best guess is that you have a particularly buggy hpet.

    --Andy

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