Re: Broken nilfs2 filesystem

[Vyacheslav Dubeyko <slava-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>]

On Wed, 2013-05-29 at 23:37 +0900, Ryusuke Konishi wrote:
> I don't know whether this may be a hint of this trouble, but according
> to the system log, page_buffers() of nilfs_end_page_io() seems to hit
> an Oops due to an invalid page address "0x36cd":
> 

Yes. There are two possible way to be in nilfs_end_page_io(): (1)
nilfs_segctor_complete_write(); (2) nilfs_abort_logs(). Currently, I
suspect the nilfs_abort_logs() because of compiler optimization. But now
I haven't evidence of it. And it needs to investigate issue more deeply
for stating something definitely, I think.

With the best regards,
Vyacheslav Dubeyko.

> May 22 18:53:31 riven kernel: [ 3821.605568] BUG: unable to handle kernel paging request at 00000000000036cd
> May 22 18:53:31 riven kernel: [ 3821.605577] IP: [<ffffffffa027f1a2>] nilfs_end_page_io+0x12/0xc0 [nilfs2]
> May 22 18:53:31 riven kernel: [ 3821.605591] PGD 19636d067 PUD 19636e067 PMD 0 
> May 22 18:53:31 riven kernel: [ 3821.605597] Oops: 0000 [#1] PREEMPT SMP 
> <snip>
> May 22 18:53:31 riven kernel: [ 3821.605829] Code: ff ff ff 48 81 c4 88 00 00 00 5b 41 5c 5d c3 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 55 48 85 ff 48 89 e5 53 48 89 fb 74 4e <48> 8b 07 f6 c4 08 0f 84 8c 00 00 00 48 8b 47 30 48 8b 00 f6 c4 
> May 22 18:53:31 riven kernel: [ 3821.605873] RIP  [<ffffffffa027f1a2>] nilfs_end_page_io+0x12/0xc0 [nilfs2]
> May 22 18:53:31 riven kernel: [ 3821.605881]  RSP <ffff8801960f7b30>
> May 22 18:53:31 riven kernel: [ 3821.605884] CR2: 00000000000036cd
> 
> where the instruction sequence of "<48> 8b 07 f6 c4 08" is "mov
> (%rdi),%rax; test $0x8, %ah", and corresponds to the part testing
> PagePrivate(page) in page_buffers() macro called within
> nilfs_end_page_io() routine:
> 
>       if (buffer_nilfs_node(page_buffers(page)) && !PageWriteback(page)) {
> 
> This cannot happen, but there may be something we missed.
> 
> 
> Regards,
> Ryusuke Konishi


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