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Date: Mon, 15 Nov 2010 20:54:39 +0100
From: Markus Trippelsdorf <markus@trippelsdorf.de>
To: Christoph Lameter <cl@linux.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        "Theodore Ts'o" <tytso@mit.edu>, linux-ext4@vger.kernel.org
Subject: Re: BUG: Bad page state in process (current git)
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On 2010.11.15 at 13:38 +0100, Markus Trippelsdorf wrote:
> On 2010.11.12 at 13:20 +0100, Markus Trippelsdorf wrote:
> > 
> > Yes. Fortunately the BUG is gone since I pulled the upcoming drm fixes
> 
> No. I happend again today (with those fixes already applied):
> 
> BUG: Bad page state in process knode  pfn:7f0a8
> page:ffffea0001bca4c0 count:0 mapcount:0 mapping:          (null) index:0x0
> page flags: 0x4000000000000008(uptodate)
> Pid: 18310, comm: knode Not tainted 2.6.37-rc1-00549-gae712bf-dirty #16
> Call Trace:
>  [<ffffffff810a9022>] ? bad_page+0x92/0xe0
>  [<ffffffff810aa240>] ? get_page_from_freelist+0x4b0/0x570
>  [<ffffffff8102e50e>] ? apic_timer_interrupt+0xe/0x20
>  [<ffffffff810aa413>] ? __alloc_pages_nodemask+0x113/0x6b0
>  [<ffffffff810a2dd4>] ? file_read_actor+0xc4/0x190
>  [<ffffffff810a4a70>] ? generic_file_aio_read+0x560/0x6b0
>  [<ffffffff810bdf8d>] ? handle_mm_fault+0x6bd/0x970
>  [<ffffffff8104b1d0>] ? do_page_fault+0x120/0x410
>  [<ffffffff810c3d85>] ? do_brk+0x275/0x360
>  [<ffffffff81452d8f>] ? page_fault+0x1f/0x30
> Disabling lock debugging due to kernel taint

And another one. But this time it seems to point to ext4:

BUG: Bad page state in process rm  pfn:52e54
page:ffffea0001222260 count:0 mapcount:0 mapping:          (null) index:0x0
page flags: 0x4000000000000008(uptodate)
Pid: 2084, comm: rm Not tainted 2.6.37-rc1-00549-gae712bf-dirty #23
Call Trace:
 [<ffffffff810a9022>] ? bad_page+0x92/0xe0
 [<ffffffff810aa240>] ? get_page_from_freelist+0x4b0/0x570
 [<ffffffff81142ae6>] ? ext4_ext_put_in_cache+0x46/0x90
 [<ffffffff810aa413>] ? __alloc_pages_nodemask+0x113/0x6b0
 [<ffffffff8118f0c7>] ? number.clone.2+0x2b7/0x2f0
 [<ffffffff810a38d5>] ? find_get_page+0x75/0xb0
 [<ffffffff810a4011>] ? find_or_create_page+0x51/0xb0
 [<ffffffff810ff4d7>] ? __getblk+0xd7/0x260
 [<ffffffff8113158f>] ? ext4_getblk+0x8f/0x1e0
 [<ffffffff811316ed>] ? ext4_bread+0xd/0x70
 [<ffffffff811369f4>] ? htree_dirblock_to_tree+0x34/0x190
 [<ffffffff8113870f>] ? ext4_htree_fill_tree+0x9f/0x250
 [<ffffffff810e109d>] ? do_filp_open+0x12d/0x5e0
 [<ffffffff811289ed>] ? ext4_readdir+0x14d/0x5a0
 [<ffffffff810e4e80>] ? filldir+0x0/0xd0
 [<ffffffff810e50a8>] ? vfs_readdir+0xa8/0xd0
 [<ffffffff810e4e80>] ? filldir+0x0/0xd0
 [<ffffffff810e51b1>] ? sys_getdents+0x81/0xf0
 [<ffffffff8102dc2b>] ? system_call_fastpath+0x16/0x1b
Disabling lock debugging due to kernel taint

I don't know. Could a possible bug in linux/fs/ext4/page-io.c be
responsible for something like this?

-- 
Markus