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Message-ID: <18344.50892.5633.905311@notabene.brown> Date: Wed, 6 Feb 2008 07:27:56 +1100 From: Neil Brown <neilb@...e.de> To: Robin Lee Powell <rlpowell@...italkingdom.org> Cc: Nick Piggin <nickpiggin@...oo.com.au>, linux-kernel@...r.kernel.org Subject: Re: Monthly md check == hung machine; how do I debug? On Tuesday February 5, rlpowell@...italkingdom.org wrote: > > I was able to solve the problem, however, like so: > > 132c133 > < # CONFIG_PREEMPT_NONE is not set > --- > > CONFIG_PREEMPT_NONE=y > 134,135c135,136 > < CONFIG_PREEMPT=y > < CONFIG_PREEMPT_BKL=y > --- > > # CONFIG_PREEMPT is not set > > # CONFIG_PREEMPT_BKL is not set > This suggests that there is some sort of race. Given that I've never hit it on SMP machines, it is probably a very small window that opens immediately after some event that triggers kernel preemption. The only "mdadm --monitor" does in the kernel is read /proc/mdstat and maybe make some GET_ARRAY_INFO/ GET_DISK_INFO ioctl calls. They don't do much more than grab the reconfig_mutex..... What sort of hardware do you have? x86? SMP or uni-processor? Also, exactly what kernel are you running? I might see if I can reproduce it... so if you can send me the broken .config, that might help too. Thanks, NeilBrown -- 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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