From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: "Ortwin Glück" <odi@odi.ch>, linux-kernel@vger.kernel.org
Subject: Re: freeze when strace X
Date: Wed, 9 Jun 2010 21:53:50 +0100 [thread overview]
Message-ID: <20100609205350.GA28383@srcf.ucam.org> (raw)
In-Reply-To: <alpine.LFD.2.00.1006092232180.2933@localhost.localdomain>
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@srcf.ucam.org
prev parent reply other threads:[~2010-06-09 20:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-09 18:38 freeze when strace X Ortwin Glück
2010-06-09 19:52 ` Matthew Garrett
2010-06-09 20:02 ` Ortwin Glück
2010-06-09 20:06 ` Matthew Garrett
2010-06-09 20:26 ` Ortwin Glück
2010-06-09 20:47 ` Thomas Gleixner
2010-06-09 20:53 ` Matthew Garrett [this message]
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