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Re: 2.6.24-rc2 crash in kmap_coherent

To: Florian Lohoff <flo@rfc822.org>
Subject: Re: 2.6.24-rc2 crash in kmap_coherent
From: Ralf Baechle <ralf@linux-mips.org>
Date: Wed, 12 Dec 2007 12:06:10 +0000
Cc: linux-mips@linux-mips.org, David Daney <ddaney@avtrex.com>
In-reply-to: <20071211221327.GB2150@paradigm.rfc822.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20071211221327.GB2150@paradigm.rfc822.org>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.17 (2007-11-01)
On Tue, Dec 11, 2007 at 11:13:27PM +0100, Florian Lohoff wrote:

> Call Trace:
> [<ffffffff8801bcf0>] kmap_coherent+0x10/0x130
> [<ffffffff8801c010>] copy_from_user_page+0x40/0xb0
> [<ffffffff88079d10>] access_process_vm+0x168/0x1d8
> [<ffffffff880d9014>] proc_pid_cmdline+0xac/0x140
> [<ffffffff880db188>] proc_info_read+0x108/0x150
> [<ffffffff8808fbdc>] vfs_read+0xec/0x178
> [<ffffffff88090060>] sys_read+0x50/0x98
> [<ffffffff88019718>] handle_sys+0x118/0x134
> 
> 
> Code: 0002127a  00021000  30420001 <00028036> 8f820024  3c038843  24420001  
> af820024  dc62f390 

Hmm...  This suggests that 283abbaef425c1bf817ecbb456c413cab08b1434 is
not quite right.  It is making the assumption that a mapped page never has
PG_dcache_dirty set.

  Ralf

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