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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Rune Torgersen <runet@innovsys.com>
Cc: Scott Wood <scottwood@freescale.com>,
	linuxppc-dev@ozlabs.org, Nathan Lynch <ntl@pobox.com>
Subject: RE: Kernel oops while duming user core.
Date: Sun, 03 Feb 2008 18:34:24 +1100	[thread overview]
Message-ID: <1202024064.7208.6.camel@pasglop> (raw)
In-Reply-To: <DCEAAC0833DD314AB0B58112AD99B93B03EE4A90@ismail.innsys.innovsys.com>


On Thu, 2008-01-31 at 16:10 -0600, Rune Torgersen wrote:
> Scott Wood wrote:
> > Scott Wood wrote:
> >> Nathan Lynch wrote:
> >>> Is the crashing program multithreaded?  The first report had firefox
> >>> triggering the oops.
> >> 
> >> OK, I've got a test program that triggers it now.  I'll see if I can
> >> figure out what's going on.
> > 
> > The problem seems to be that update_mmu_cache() is called on a guard
> > page with no access rights. 
> > 
> > Changing update_mmu_cache() to always call flush_dcache_icache_page()
> > fixes it, though a better performing fix would probably be to add an
> > exception table entry for the dcbst.
> 
> I can confirm that this seems to fix it.

Might be better to avoid the flush when the page isn't readable ?

Ben.

  reply	other threads:[~2008-02-03  7:35 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-31 13:45 Kernel oops while duming user core Rune Torgersen
2008-01-31 16:15 ` Nathan Lynch
2008-01-31 16:26   ` Rune Torgersen
2008-01-31 17:40     ` Rune Torgersen
2008-01-31 19:15       ` Kumar Gala
2008-01-31 19:18         ` Rune Torgersen
2008-01-31 20:16       ` Scott Wood
2008-01-31 20:19         ` Rune Torgersen
2008-01-31 20:38         ` Rune Torgersen
2008-01-31 20:41         ` Nathan Lynch
2008-01-31 20:45           ` Rune Torgersen
2008-01-31 20:55           ` Scott Wood
2008-01-31 21:58             ` Scott Wood
2008-01-31 22:10               ` Rune Torgersen
2008-02-03  7:34                 ` Benjamin Herrenschmidt [this message]
2008-02-04 18:23                   ` Kernel oops while dumping " Scott Wood
2008-01-31 19:15     ` Kernel oops while duming " Kumar Gala
2008-01-31 19:23       ` Rune Torgersen
2008-01-31 19:54         ` Nathan Lynch
2008-02-01 17:38   ` Scott Wood
2008-02-02 12:05     ` Clemens Koller

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