linux-kernel - Re: freeze when strace X

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Message-ID: <20100609205350.GA28383@srcf.ucam.org>
Date:	Wed, 9 Jun 2010 21:53:50 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Ortwin Glück <odi@....ch>,
	linux-kernel@...r.kernel.org
Subject: Re: freeze when strace X

On Wed, Jun 09, 2010 at 10:47:23PM +0200, Thomas Gleixner wrote:
> On Wed, 9 Jun 2010, Matthew Garrett wrote:
> > strace needs to output text via X, which generates output which needs to 
> > be output via X... and you'll tend to deadlock. If X is holding any 
> > interesting kernel locks at that point then it wouldn't surprise me if 
> > the machine ends up dead.
> 
> Nothing to do with kernel locks. strace hooks into the syscall and
> intercepts the data, so X is stopped at that point. Now try to send
> output to a program which you stopped yourself :)

Oh, yeah, and ctrl+alt+fwhatever is handled by X.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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