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Date:	Mon, 14 Jan 2008 09:22:42 -0800
From:	David Daney <ddaney@avtrex.com>
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To:	Noah Meyerhans <frodo@morgul.net>
Cc:	linux-mips@linux-mips.org
Subject: Re: memory related kernel bug on cobalt raq2
References: <20080114153114.GN3899@morgul.net>
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Noah Meyerhans wrote:
> Hi all.  I know this has come up in the past, but in case it's helpful, I
> figured I'd report that the kernel bug previously reported at (at least)
> http://www.linux-mips.org/archives/linux-mips/2007-10/msg00093.html is still
> present in current git kernels (more recently observed in
> 2.6.24-rc7-raq2-gaeb7040e-dirty).  Here's the kernel output:
> 
> Kernel bug detected[#1]:
> Cpu 0
> $ 0   : 00000000 b000ec00 00000001 00000004
> $ 4   : 81107760 7fb60f09 0000000e 83fb6000
> $ 8   : 00000f09 7fb60f09 800f5fe8 00000000
> $12   : 00000000 00000000 83ea6cc0 004038b4
> $16   : 81107760 0000000e 83fb6000 7fb60f09
> $20   : 803c0000 8fdf2cc0 00000000 86015e28
> $24   : 00000006 8008d480
> $28   : 86014000 86015de0 86015e2c 8008b2cc
> Hi    : 00000000
> Lo    : 00000000
> epc   : 8008af9c kmap_coherent+0xc/0xe0     Not tainted
> ra    : 8008b2cc copy_from_user_page+0xb0/0xe4
> Status: b000ec03    KERNEL EXL IE
> Cause : 00800034
> PrId  : 000028a0 (Nevada)
> Process cat (pid: 5739, threadinfo=86014000, task=804b9178)
> Stack : 8fdf2cc0 7fb60f09 83fb6000 0000000e 0000000e 7fb60f09 83fb6000 00000000
>         0000000e 800e0484 8fc75178 804b9178 000800d0 00000000 883bbf09 0000000e
>         86015e2c 86015e28 8fe0dbfc 81107760 8fdf2cf4 00000000 8fdf2cc0 00000000
>         0000000e 83fb6000 00000400 8fc75178 00001000 0052c7c8 00000000 80133f5c
>         8fc75178 8fa26704 83fb6000 86015f18 00000000 0052c7c8 8fc75178 83fb6000
>         ...
> Call Trace:
> [<8008af9c>] kmap_coherent+0xc/0xe0
> [<8008b2cc>] copy_from_user_page+0xb0/0xe4
> [<800e0484>] access_process_vm+0x178/0x21c
> [<80133f5c>] proc_pid_cmdline+0xa4/0x14c
> [<80136300>] proc_info_read+0x104/0x144
> [<800f5a7c>] vfs_read+0xc0/0x160
> [<800f603c>] sys_read+0x54/0xa0
> [<80088cac>] stack_done+0x20/0x3c
> 

Yes, this would seem to be the same problem as:

http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=20071211221327.GB2150%40paradigm.rfc822.org

There is a similar problem in  2.6.23.

David Daney