From: Blaisorblade <blaisorblade@yahoo.it>
To: user-mode-linux-devel@lists.sourceforge.net
Cc: Jeff Dike <jdike@addtoit.com>, Damon LaCrosse <arid@inbox.ru>,
user-mode-linux-user@lists.sourceforge.net
Subject: Re: [uml-devel] Is this a known printk bug?
Date: Thu, 26 Oct 2006 02:07:41 +0200 [thread overview]
Message-ID: <200610260207.41671.blaisorblade@yahoo.it> (raw)
In-Reply-To: <20061025155953.GB4996@ccure.user-mode-linux.org>
On Wednesday 25 October 2006 17:59, Jeff Dike wrote:
> On Tue, Oct 24, 2006 at 01:01:00PM +0200, Damon LaCrosse wrote:
> > On certain situations where printk are embedded in spinlock protected
> > regions (i.e. "spin_lock(); for () { printk(); } spin_unlock(); }") I
> > often experience uml lockups like this one:
>
> Yeah, known bug. We are using spinlocks improperly in the console
> subsystem.
Disable spinlock debugging and this bug will not show up; disabling these two
ones is sufficient:
CONFIG_DEBUG_SPINLOCK=y
CONFIG_DEBUG_SPINLOCK_SLEEP=y
I'm fighting this one very actively and having interesting results (not all
misuses have been fixed and patches are not yet perfect, but it'll work well
soon I hope).
--
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade
http://www.user-mode-linux.org/~blaisorblade
Chiacchiera con i tuoi amici in tempo reale!
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prev parent reply other threads:[~2006-10-26 0:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-24 11:01 [uml-devel] Is this a known printk bug? Damon LaCrosse
2006-10-25 15:59 ` Jeff Dike
2006-10-26 0:07 ` Blaisorblade [this message]
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