linux-kernel - Re: BUG: unable to handle kernel NULL pointer deref, bisected to 746650160

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Message-ID: <20150417153116.5f97e007@goldlack.schiller106>
Date:	Fri, 17 Apr 2015 15:31:16 +0200
From:	Torsten Luettgert <ml-lkml@...a.eu>
To:	Christoph Hellwig <hch@....de>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: BUG: unable to handle kernel NULL pointer deref, bisected to
 746650160

On Mon, 13 Apr 2015 20:28:29 +0200
Torsten Luettgert <ml-lkml@...a.eu> wrote:

> On Mon, 13 Apr 2015 19:41:05 +0200
> Christoph Hellwig <hch@....de> wrote:
> 
> > Can you run gdb on your vmlinux file and send the output of the
> > following command in gdb
> > 
> > l *(scsi_dma_unmap+0x54)
> 
> Thanks for looking into it! Here is what gdb says: [...]

Hello Christoph,

do you think it could be a compiler problem? I still can't imagine why
only 2 people have seen this (at least it wasn't just me), but it
_always_ hits with newer kernels on that node.

Right now, I'm trying the problematic release, compiled with a newer
gcc (4.9.2-6 from Fedora, while using 4.4.7-11 from rhel6
before). It has only been running a few hours yet, so I can't tell if
it's good.

Regards,
Torsten
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