From: Sergei Shtylyov <sshtylyov@ru•mvista.com>
To: Charles Krinke <ckrinke@istor•com>
Cc: Chris Carlson <ccarlson@istor•com>,
Kevin Smith <ksmith@istor•com>,
linuxppc-embedded@ozlabs•org
Subject: Re: Exception in kernel mode
Date: Thu, 15 Mar 2007 18:52:45 +0300 [thread overview]
Message-ID: <45F96BCD.4050401@ru.mvista.com> (raw)
In-Reply-To: <9F3F0A752CAEBE4FA7E906CC2FBFF57C06A197@MERCURY.inside.istor.com>
Hello.
Charles Krinke wrote:
> I have a PPC8241 which does an
> Oops: Exception in kernel mode, sig: 4 [#1]
> PREEMPT
> NIP: 00000900 LR: C00E579C CTR: 00003A55
> When doing a 'tar -xvzf'. The NIP is pointing at the decrementer
> interrupt, I believe.
> As I understand the decrementer, this is basically the timer tick in the
> ppc and goes off every n ms continuously.
> A tar is going to be concerned with date/time stamps on files, so it has
> some interaction with the clock algorithms.
> It seems to me that the decrementer should be able to go off at any time
> during kernel operation, so maybe the "Exception in kernel mode" is
> pointing us in an unusual direction.
Obviously, you've got an exception in the decrementer exception handler
itself -- and this was something like program check exception, judging on the
signal you've got (SIGILL).
> So, with that said:
> "What might be the causes of such an exception from the decrementer in a
> 2.6.17.11 ppc8241 kernel?"
> "Where should one concentrate ones efforts in figuring this out?"
Hrm, looks like some CPU errata maybe...
WBR, Sergei
next prev parent reply other threads:[~2007-03-15 15:53 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-14 21:42 U-boot with flat device tree Benedict, Michael
2007-03-14 22:46 ` Kim Phillips
[not found] ` <CF7E46FCFF66AD478BB72724345289EC27953F@twx-exch01.twacs.local>
[not found] ` <20070314180112.15492178.kim.phillips@freescale.com>
2007-03-14 23:42 ` Benedict, Michael
2007-03-15 15:41 ` Exception in kernel mode Charles Krinke
2007-03-15 15:52 ` Sergei Shtylyov [this message]
2007-03-15 18:19 ` Charles Krinke
2007-03-15 18:23 ` Sergei Shtylyov
2007-03-15 18:55 ` Charles Krinke
2007-03-15 19:28 ` Kumar Gala
2007-03-15 19:56 ` Charles Krinke
2007-03-15 21:17 ` Charles Krinke
2007-03-15 23:44 ` Kumar Gala
2007-03-16 14:45 ` Charles Krinke
2007-03-16 15:33 ` Kumar Gala
2007-03-16 16:05 ` Charles Krinke
2007-03-15 23:50 ` u-boot+linux for ML403 board Leonid
2007-03-15 16:37 ` U-boot with flat device tree Jon Loeliger
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