linux-kernel - Re: kdump broken on 2.6.37-rc4

Open Source and information security mailing list archives

Message-ID: <20101203175401.GE28603@hmsreliant.think-freely.org>
Date:	Fri, 3 Dec 2010 12:54:01 -0500
From:	Neil Horman <nhorman@...hat.com>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	Maxim Uvarov <muvarov@...il.com>, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: kdump broken on 2.6.37-rc4

On Fri, Dec 03, 2010 at 06:11:48PM +0100, Stanislaw Gruszka wrote:
> On Fri, Dec 03, 2010 at 06:46:09PM +0300, Maxim Uvarov wrote:
> > 2010/12/3 Stanislaw Gruszka <sgruszka@...hat.com>:
> > > On my T-60 laptop, i686 system with 2.6.37-rc4 kernel,
> > > "echo c > /proc/sysrq-trigger" just hung the system. Kdump
> > > works on 2.6.36. Is this known issue? If not, what info
> > > I should provide to solve it (I think the easiest way
> > > to solve the problem would be bisect) ?
> > >
> > > Stanislaw
> > >
> > 
> > I tested x86 QEMU yesterday with the latest git. It worked.
> > Might be something target specific.., What does console print?
> 
> Here is the photo 
> http://people.redhat.com/sgruszka/20101203_005.jpg
> 
> There are two BUGs, first "sleeping function called from invalid
> context" and then "unable to handle null pointer dereference".
> 
The warning about sleeping is an artifact of the fact that we panic the box with
irqs disabled I think (although I would think the fault handler would have
re-enabled them properly).  Not sure what the NULL pointer is from
Neil

> Stanislaw
> 
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