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From: "Randy.Dunlap" <rdunlap@xenotime.net>
To: Ingo Molnar <mingo@elte.hu>
Cc: rmk+serial@arm.linux.org.uk, linux-kernel@vger.kernel.org
Subject: Re: soft lockup in serial8250_console_write(?)
Date: Tue, 14 Mar 2006 15:18:12 -0800	[thread overview]
Message-ID: <20060314151812.2779ed4b.rdunlap@xenotime.net> (raw)
In-Reply-To: <20060314214049.GA29536@elte.hu>

On Tue, 14 Mar 2006 22:40:49 +0100 Ingo Molnar wrote:

> 
> * Randy.Dunlap <rdunlap@xenotime.net> wrote:
> 
> > Hi,
> > 
> > (x86_64; 2.6.16-rc6; serial console configured but nothing connected 
> > to the serial port)
> > 
> > I'm seeing an occasional soft lockup, maybe in 
> > serial8250_console_write(). (drivers/serial/8250.c)
> > 
> > This function calls wait_for_xmitr() [inline], which in worst case can 
> > spin for 1.010 seconds.  Could this be the cause of a soft lockup?
> 
> hm, it shouldnt cause that. Could you try the attached patch [which is 
> the next-gen softlockup detector], do you get the message even with that 
> one applied?

5/5 good boots with your new patch.
5/5 soft lockups without it.

Is this scheduled for post-2.6.16 ?

Thanks,
---
~Randy

  reply	other threads:[~2006-03-14 23:16 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-03-14 21:41 Randy.Dunlap
2006-03-14 21:40 ` Ingo Molnar
2006-03-14 23:18   ` Randy.Dunlap [this message]
2006-03-14 23:25     ` Ingo Molnar
2006-03-14 23:45       ` Andrew Morton

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