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SubjectRe: Regression in v3.4-rc0 " BUG: soft lockup - CPU#0 stuck for 29s! [migration/0:6]..[<ffffffff810d3b8b>] stop_machine_cpu_stop+0x7b/0xf"
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On Wed, 2012-03-21 at 16:57 +0100, Peter Zijlstra wrote:
> On Wed, 2012-03-21 at 11:26 -0400, Konrad Rzeszutek Wilk wrote:
> > On Tue, Mar 20, 2012 at 07:53:22PM -0400, Konrad Rzeszutek Wilk wrote:
> > > Seeing this in v3.4-rc0 tree and didn't see that with v3.3:
> >
> > Hey Peter,
> >
> > Git bisection points this to the fault of
> > 5fbd036b552f633abb394a319f7c62a5c86a9cd7 " sched: Cleanup cpu_active madness"
> >
> > thoughts? (also attaching the .config)
>
> Argh.. so when is this? boot? No that's somewhat unexpected. I have one
> report of funnies during a hotplug bash that I'm looking into, but I
> haven't actually been able to reproduce that report myself either.

is arch/x86/xen/smp.c:cpu_bringup() missing a call to
notify_cpu_starting() before doing set_cpu_online()?

Also, shouldn't that also take the ipi_call_lock() around setting the
cpu online?


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