From: David Daney <ddaney@avtrex.com>
To: Ralf Baechle <ralf@linux-mips.org>
Cc: Giuseppe Sacco <giuseppe@eppesuigoccas.homedns.org>,
linux-mips@linux-mips.org
Subject: Re: kernel bug using 2.6.23-rc9
Date: Fri, 05 Oct 2007 08:57:24 -0700 [thread overview]
Message-ID: <47065EE4.8030402@avtrex.com> (raw)
In-Reply-To: <20071005122543.GB22239@linux-mips.org>
Ralf Baechle wrote:
> On Thu, Oct 04, 2007 at 02:49:13PM +0200, Giuseppe Sacco wrote:
>
>> Hi, while testing the latest kernel on SGI O2 I got may kernel bugs like
>> this:
>>
>> Kernel bug detected[#9]:
>> Cpu 0
>> $ 0 : 0000000000000000 ffffffff9001fce0 0000000000000001 0000000000000f18
>> $ 4 : 980000000111b4b8 000000007f955f18 ffffffff80400000 0000000000003fff
>> $ 8 : 00000000000050f1 000000007f955f18 9800000006073d68 9800000006073d60
>> $12 : 0000000000000010 ffffffff80000008 ffffffff80091680 0000000000000000
>> $16 : 980000000111b4b8 980000000768ddd0 000000000000000e 000000007f955f18
>> $20 : 9800000000581908 9800000007898080 9800000006073d68 9800000006073d60
>> $24 : 0000000000478284 000000002ac30580
>> $28 : 9800000006070000 9800000006073cd0 0000000000000000 ffffffff8001b390
>> Hi : 000000000000f2d3
>> Lo : 00000000000050f1
>> epc : ffffffff8001c800 kmap_coherent+0x10/0x118 Tainted: G D
>> ra : ffffffff8001b390 __flush_anon_page+0x70/0x90
>
> Very interesting. Can you describe me your setup or maybe even come up
> with a test case for this?
>
Perhaps: 'cat /proc/self/cmdline'
As we were hacking O_DIRECT support into 2.6.15, I found what seems like
a very similar situation.
It seems that all users of get_user_pages() *except*
/proc/*/[cmdline|environ] call get_user_pages() with addresses aligned
on page boundaries. I am not sure if that is the problem here, but it
seems similar.
David Daney.
next prev parent reply other threads:[~2007-10-05 15:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-04 12:49 kernel bug using 2.6.23-rc9 Giuseppe Sacco
2007-10-05 12:25 ` Ralf Baechle
2007-10-05 15:57 ` David Daney [this message]
2007-10-06 7:08 ` Giuseppe Sacco
2007-10-06 23:54 ` Ralf Baechle
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