linux-kernel - Re: System hang from holding left shift key

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Date:	Tue, 4 Nov 2008 11:56:00 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Alan <alan@...rguk.ukuu.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: System hang from holding left shift key


> While absentmindedly holding down the left shift key as I was thinking about my
> next input, I froze the keyboard. After 3 seconds, the system sounded a high
> beep, and then a low beep after another 3 seconds. At that point, no key entry
> had any effect. From the beeps, one might conclude that the input buffer is
> full, but a CTRL/U did not clear it. Fortunately, a short press on the power
> button shut down the machine cleanly.
> 
> I don't know if this is a regression. I found it in v2.6.28-rc2, but the oldest
> kernel that I could test (v2.6.24) already has the problem.
> 
> When the beeps occur, a stack dump is as follows:

What kind of machine is that...? I can't reproduce it here, do I need
some accessibility options enabled?

									Pavel


> Pid: 2989, comm: Xorg Not tainted 2.6.28-rc2-Linus-00473-g67d1128-dirty #2
> Call Trace:
>   [<ffffffff803957ce>] kd_mksound+0x69/0xa9
>   [<ffffffff8039196c>] vt_ioctl+0x3c4/0x1744
>   [<ffffffff8038b097>] tty_ioctl+0x793/0x7fa
>   [<ffffffff8025c6c0>] ? trace_hardirqs_off+0xd/0xf
>   [<ffffffff8044f94a>] ? _spin_unlock_irqrestore+0x3d/0x4c
>   [<ffffffff802bf102>] vfs_ioctl+0x2f/0x7d
>   [<ffffffff802bf4fe>] do_vfs_ioctl+0x3ae/0x3e0
>   [<ffffffff8020c07c>] ? sysret_check+0x27/0x62
>   [<ffffffff802bf577>] sys_ioctl+0x47/0x6a
>   [<ffffffff8020c04b>] system_call_fastpath+0x16/0x1b
> 
> Thanks,
> 
> Larry
> 
> 
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