Re: Broken nilfs2 filesystem

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

On Thu, 2013-05-30 at 15:55 +0900, Ryusuke Konishi wrote:
> On Thu, 30 May 2013 10:13:05 +0400, Vyacheslav Dubeyko wrote:
> > 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()
> 
> That sounds a likely cause.
> 
> Can you test nilfs_abort_logs by injecting a random fault in some easy
> way ?
> 

Yes, sure. Now I am thinking about proper place for such injection. I'll
share results of such attempt.

With the best regards,
Vyacheslav Dubeyko.

> Regards,
> Ryusuke Konishi
> 
> 
> > 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
> > 
> > 
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in
> > the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> --
> To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html


--
To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html