From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: Kernel boot hangs on commit "switch fput to task_work_add"
Date: Sat, 14 Jul 2012 15:14:15 +0100
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Cc: linux-fsdevel@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
To: Fengguang Wu <wfg@linux.intel.com>
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On Sat, Jul 14, 2012 at 09:58:49PM +0800, Fengguang Wu wrote:
> > Hi Al, here I got the output for
> > 
> > (qemu) sendkey alt-sysrq-l
> > (qemu) sendkey alt-sysrq-t
> 
> I repeated that several times and here are the results.
> 
> (qemu) sendkey alt-sysrq-l
> (qemu) sendkey alt-sysrq-l
> (qemu) sendkey alt-sysrq-l
> (qemu) sendkey alt-sysrq-t
> (qemu) sendkey alt-sysrq-t
> (qemu) quit
> 
> The user space shutdown is polling on something, which prevents the
> system from reboot..

Which userland it is?