Re: xfs_iunlink_remove: xfs_inotobp() returned error 22 -- debugging

符永涛
2013-04-20T04:11:18Z

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And glusterfs always uses hardlink for sel-heal too(a backend file has a
hardlink under a hidden directory which name is .glusterfs). So as you have
mentioned reduce di_nlink may also conflicts.

2013/4/20 符永涛 <yongtaofu@gmail.com>

> Hi Eric,
> I will enable them and run test again. I can only reproduce it with
> glusterfs rebalance. Glusterfs uses a mechanism it called syncop to unlink
> file. For rebalance it uses
> syncop_unlink(glusterfs/libglusterfs/src/syncop.c). In the glusterfs
> sync_task framework(glusterfs/libglusterfs/src/syncop.c) it uses
> "makecontext/swapcontext"<http://www.opengroup.org/onlinepubs/009695399/functions/makecontext.html>.
> Does it leads to racing unlink from different CPU core?
> Thank you.
>
>
> 2013/4/20 Eric Sandeen <sandeen@sandeen.net>
>
>> On 4/19/13 7:51 PM, 符永涛 wrote:
>> > After change mount option to sync shutdown still happens, and I got a
>> trace again, the inode 0x1c57d is abnormal.
>>
>> since this is a race on namespace operations, I wouldn't have expected
>> sync to matter.
>>
>> >
>> https://docs.google.com/file/d/0B7n2C4T5tfNCYW1jNWhBbXBYakE/edit?usp=sharing
>> > I have a question if the problem is hard to reproduce why I got 8 times
>> in a week only in a test cluster with 8 node?
>> > What's the problem?
>>
>> you must have something unique in your environment, and we don't know
>> what it is.
>>
>> To gather more information, can you also turn on tracepoints for:
>>
>> xfs_rename
>> xfs_create
>> xfs_link
>> xfs_remove
>>
>> in addition to xfs_iunlink and xfs_iunlink_remove,
>> and we'll see what that tells us.
>>
>> There are many paths that manipulate the di_nlink count, and something is
>> racing, but we don't yet know what two callchains they are.
>>
>> The above are all the callers that manipulate the link count, so they
>> will yield more information about who is manipulating the counts.
>>
>> Thanks,
>> -Eric
>>
>>
>
>
> --
> 符永涛
>

--
符永涛

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