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Date: Fri, 01 Jun 2007 23:23:20 +0200 From: Miklos Szeredi <miklos@...redi.hu> To: mingo@...e.hu CC: michal.k.k.piotrowski@...il.com, linux-kernel@...r.kernel.org Subject: Re: [1/3] 2.6.22-rc3: known regressions v2 > i have no better ideas that what you already tried - but unfortunately > the tracer makes the bug go away and the NMI watchdog crashes your box. > Btw., nmi_watchdog=2 might have a higher chance of surviving (it can > still lock up a T60 but with a lower likelyhood). Good tip, nmi_watchdog=2 worked. Unlike the previous freezes, after this one it didn't continue after some minutes. Don't know if that's because the NMI oopser changed something, or if this is a slightly different lockup... No serial port on this laptop, so screenshot done with digicam: http://www.kernel.org/pub/linux/kernel/people/mszeredi/freeze/nmioops.jpg Here are the transcribed stack traces: CPU1 process: strace _spin_lock task_rq_lock wait_task_inactive ptrace_check_attach sys_ptrace CPU0 process: fusexmp_fh (this is one of several similar threads being straced) _spin_lock_irq schedule ptrace_stop ptrace_notify syscall_trace syscall_trace_enter tracesys Both these seem to be spinning on rq->lock, but who is holding this lock? Miklos - 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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