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SubjectRe: [tip:core/rcu] rcu: Fix holdoff for accelerated GPs for last non-dynticked CPU
On Wed, Mar 17, 2010 at 06:53:11PM +0100, Ingo Molnar wrote:
>
> * Ingo Molnar <mingo@elte.hu> wrote:
>
> > incidentally i have a RCU badness crash log from another box:
> >
> > [ 4.573332] initcall ipmi_init_msghandler_mod+0x0/0xd returned 0 after 0 usecs
> > [ 4.573332] calling init_ipmi_si+0x0/0x435 @ 1
> > [ 4.573332] IPMI System Interface driver.
> > [ 4.573340] [<ffffffff81022cdc>] no_context+0x1fc/0x20b
> > [ 4.576672] [<ffffffff81002a16>] ? ftrace_call+0x5/0x2b
> > [ 4.580021] [<ffffffff81022e77>] __bad_area_nosemaphore+0x18c/0x1af
> > [ 4.583338] [<ffffffff81002a16>] ? ftrace_call+0x5/0x2b
> > [ 4.586672] [<ffffffff81022ead>] bad_area_nosemaphore+0x13/0x15
> > [ 4.590005] [<ffffffff81023159>] do_page_fault+0x138/0x284
> > [ 4.593354] [<ffffffff81a632bf>] page_fault+0x1f/0x30
>
> I spent a few hours yesterday and today trying to track this down, but failed
> to bisect it. The crash is sporadic on many configs - which confused my
> bisection attempts. Sometimes it crashes only after 10 reboots. Was able to
> crash v2.6.30 as well, so it's an older bug. v2.6.29 was not testable on that
> box due to network driver problems so i stopped there.

OK, I give up...

What did you change about your testing? ;-)

Thanx, Paul


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