Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1349724

Re: soft lockup when passing vvar address to write(2)

Show all headers | View raw

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

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

soft lockup when passing vvar address to write(2) Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2016-03-04 00:00 +0100
  Re: soft lockup when passing vvar address to write(2) Andy Lutomirski <luto@amacapital.net> - 2016-03-04 01:20 +0100
    Re: soft lockup when passing vvar address to write(2) Andy Lutomirski <luto@amacapital.net> - 2016-03-05 00:50 +0100
      Re: soft lockup when passing vvar address to write(2) Thomas Gleixner <tglx@linutronix.de> - 2016-03-05 09:30 +0100
        Re: soft lockup when passing vvar address to write(2) Ingo Molnar <mingo@kernel.org> - 2016-03-05 10:10 +0100
          Re: soft lockup when passing vvar address to write(2) Andy Lutomirski <luto@amacapital.net> - 2016-03-06 04:00 +0100

csiph-web