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Old 09-28-2011, 09:07 AM
Jonathan Nieder
 
Default Bug#643629: linux-image-2.6.39-bpo.2-amd64: BUG at fs/jbd2/transaction.c:1086

Hi Nico,

nico wrote:

> kernel BUG at [...]/fs/jbd2/transaction.c:1086!
[...]
> Call Trace:
> [<ffffffffa059b82d>] ? ocfs2_journal_dirty+0x47/0x58 [ocfs2]
> [<ffffffffa057e3b1>] ? __ocfs2_add_entry+0x78d/0x88d [ocfs2]
> [<ffffffffa03a1cb4>] ? jbd2_journal_put_journal_head+0x19/0x4e [jbd2]
> [<ffffffffa039b9b4>] ? jbd2_journal_get_write_access+0x2d/0x38 [jbd2]
> [<ffffffffa05a5e37>] ? ocfs2_link+0x55e/0x7ac [ocfs2]
> [<ffffffffa058fd4e>] ? ocfs2_permission+0xec/0xf9 [ocfs2]
> [<ffffffff81104701>] ? vfs_link+0xc3/0x126
> [<ffffffff81107084>] ? sys_linkat+0x11d/0x179
> [<ffffffff810ff09c>] ? sys_newstat+0x24/0x2d
> [<ffffffff81339392>] ? system_call_fastpath+0x16/0x1b
> Code: 48 8b 13 f7 c2 00 00 10 00 75 f3 f0 0f ba 2b 14 19 d2 85 d2 75 e8 83 7d 10 00 75 19 c7 45 10 01 00 00 00 41 8b 55 08 85 d2 7f 04 <0f> 0b eb fe ff ca 41 89 55 08 48 39 45 28 75 11 83 7d 0c 01 75
> RIP [<ffffffffa039b05e>] jbd2_journal_dirty_metadata+0x5d/0xe3 [jbd2]

The tripped assertion is

if (jh->b_modified == 0) {
/*
* This buffer's got modified and becoming part
* of the transaction. This needs to be done
* once a transaction -bzzz
*/
jh->b_modified = 1;
J_ASSERT_JH(jh, handle->h_buffer_credits > 0);
handle->h_buffer_credits--;
}

Is this reproducible? If so, could you try a 3.x kernel from sid or
experimental? (There have been some fixes for bugs like this in ext3
and ext4 but I don't see any similar change to ocfs2. Even so, it
seems worth a try before contacting upstream about this.)

Thanks,
Jonathan



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Old 09-28-2011, 09:35 AM
Jonathan Nieder
 
Default Bug#643629: linux-image-2.6.39-bpo.2-amd64: BUG at fs/jbd2/transaction.c:1086

(just cc-ing the bug log)
Nico Giefing wrote:

> I'm not sure if its possible to try a 3.x kernel, i have to check that.
> its "not" reproduable, the symptoms happened now the second time, which are:
> no access to the file system and not killable processes.
>
> i will restart now the machine and let you know if 3.x is possible.

Thanks, Nico.

Jonathan



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