Re: [PATCH][GIT PULL] tracing: Fix compile issue for trace_sched_wakeup.c

Jason Baron
2010-10-20T16:44:45Z

On Wed, Oct 20, 2010 at 05:40:45PM +0200, Ingo Molnar wrote:
> FYI, there's a new mystery hang (sometimes crash) that triggers in -tip - and which
> seems to be tracing related. See the crashlog below - config attached.
>
> It's not bisectable - small changes in the kernel make the bug come/go. (might be a
> race of some sorts)
>
> Thanks,
>
> Ingo
>

strange b/c it looks like we get though enabling/disabling the
tracepoitns individually, but then when we go to enable all the
tracepoints we hit this hang - perhaps, suggesting a race. Do we always
fail after "Testing all events:" is printed? Does the crash have any
more clues. I will try and re-produce this.

Also, I noticed some recent changes to text_poke_smp() usage of
stop_machine() on Oct. 14th. That's related to the area where this appears
to hang, so if things were working with this .config before then, that
might be a place to look. Adding Masami to the 'cc list.

thanks,

-Jason