Weird deadlock when shutting down
in [Kernel]
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From: Johannes Berg on 20 Feb 2010 09:00 On Sat, 2010-02-20 at 21:44 +0800, Américo Wang wrote: > That message is displayed before shutting down the devices. > > To verify, you can add some printk() in the end of > __cpufreq_remove_dev(), or enable CONFIG_CPU_FREQ_DEBUG. That is already enabled. johannes -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Américo Wang on 21 Feb 2010 05:00 On Sat, Feb 20, 2010 at 9:57 PM, Johannes Berg <johannes(a)sipsolutions.net> wrote: > On Sat, 2010-02-20 at 21:44 +0800, Américo Wang wrote: > >> That message is displayed before shutting down the devices. >> >> To verify, you can add some printk() in the end of >> __cpufreq_remove_dev(), or enable CONFIG_CPU_FREQ_DEBUG. > > That is already enabled. > Ok, I got it. Could you test the patch below? Thanks! -----------------> Signed-off-by: WANG Cong <xiyou.wangcong(a)gmail.com>
From: Johannes Berg on 21 Feb 2010 05:20 On Sun, 2010-02-21 at 17:51 +0800, Américo Wang wrote: > On Sat, Feb 20, 2010 at 9:57 PM, Johannes Berg > <johannes(a)sipsolutions.net> wrote: > > On Sat, 2010-02-20 at 21:44 +0800, Américo Wang wrote: > > > >> That message is displayed before shutting down the devices. > >> > >> To verify, you can add some printk() in the end of > >> __cpufreq_remove_dev(), or enable CONFIG_CPU_FREQ_DEBUG. > > > > That is already enabled. > > > > Ok, I got it. > > Could you test the patch below? Thanks! No change, sorry, still hangs right after "Disabling non-boot CPUs ..." before the machine turns off. johannes
From: Johannes Berg on 21 Feb 2010 05:50 Incidentally, the machine also freezes hard without any output at all if I "echo 0 > /sys/.../cpu1/online". johannes
From: Xiaotian Feng on 21 Feb 2010 06:00
On Sun, Feb 21, 2010 at 6:43 PM, Johannes Berg <johannes(a)sipsolutions.net> wrote: > Incidentally, the machine also freezes hard without any output at all if > I "echo 0 > /sys/.../cpu1/online". It might be nothing related with cpufreq. I think there's something wrong during the _cpu_down path. put more debug printks into _cpu_down(), if we can find kernel is stuck in which place in _cpu_down, it would be helpful. > > johannes > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |