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 ?
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
>
>
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