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Date: Tue, 24 Apr 2007 13:33:59 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Jeremy Fitzhardinge <jeremy@...p.org> Cc: Prarit Bhargava <prarit@...hat.com>, Rick Lindsley <ricklind@...ibm.com>, john stultz <johnstul@...ibm.com>, Linux Kernel <linux-kernel@...r.kernel.org>, Eric Dumazet <dada1@...mosbay.com>, virtualization@...ts.osdl.org, Chris Lalancette <clalance@...hat.com>, Paul Mackerras <paulus@...ba.org>, Martin Schwidefsky <schwidefsky@...ibm.com>, Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: [patch 1/4] Ignore stolen time in the softlockup watchdog On Tue, 24 Apr 2007 13:24:24 -0700 Jeremy Fitzhardinge <jeremy@...p.org> wrote: > Jeremy Fitzhardinge wrote: > > Andrew Morton wrote: > > > >> Well, it _is_ mysterious. > >> > >> Did you try to locate the code which failed? I got lost in macros and > >> include files, and gave up very very easily. Stop hiding, Ingo. > >> > >> > > > > OK, I've managed to reproduce it. Removing the local_irq_save/restore > > from sched_clock() makes it go away, as I'd expect (otherwise it would > > really be magic). But given that it never seems to touch the softlockup > > during testing, I have no idea what difference it makes... > > And sched_clock's use of local_irq_save/restore appears to be absolutely > correct, so I think it must be triggering a bug in either the self-tests > or lockdep itself. It's weird. And I don't think the locking selftest code calls sched_clock() (or any other time-related thing) at all, does it? > The only way I could actually extract the test code itself was to run > the whole thing through cpp+indent, but it doesn't shed much light. > > It's also not clear to me if there are 6 independent failures, or if > they're a cascade. Oh well. I'll restore the patches and when people hit problems we can blame Ingo! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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