[ceph-users] CephFS: clients hanging on write with ceph-fuse

Gregory Farnum gfarnum at redhat.com
Thu Nov 2 21:29:59 PDT 2017


Either ought to work fine.

On Thu, Nov 2, 2017 at 4:58 PM Andras Pataki <apataki at flatironinstitute.org>
wrote:

> I'm planning to test the newer ceph-fuse tomorrow.  Would it be better to
> stay with the Jewel 10.2.10 client, or would the 12.2.1 Luminous client be
> better (even though the back-end is Jewel for now)?
>
>
> Andras
>
>
>
> On 11/02/2017 05:54 PM, Gregory Farnum wrote:
>
> Have you tested on the new ceph-fuse? This does sound vaguely familiar and
> is an issue I'd generally expect to have the fix backported for, once it
> was identified.
>
> On Thu, Nov 2, 2017 at 11:40 AM Andras Pataki <
> apataki at flatironinstitute.org> wrote:
>
>> We've been running into a strange problem with Ceph using ceph-fuse and
>> the filesystem. All the back end nodes are on 10.2.10, the fuse clients
>> are on 10.2.7.
>>
>> After some hours of runs, some processes get stuck waiting for fuse like:
>>
>> [root at worker1144 ~]# cat /proc/58193/stack
>> [<ffffffffa08cd241>] wait_answer_interruptible+0x91/0xe0 [fuse]
>> [<ffffffffa08cd653>] __fuse_request_send+0x253/0x2c0 [fuse]
>> [<ffffffffa08cd6d2>] fuse_request_send+0x12/0x20 [fuse]
>> [<ffffffffa08d69d6>] fuse_send_write+0xd6/0x110 [fuse]
>> [<ffffffffa08d84d5>] fuse_perform_write+0x2f5/0x5a0 [fuse]
>> [<ffffffffa08d8a21>] fuse_file_aio_write+0x2a1/0x340 [fuse]
>> [<ffffffff811fdfbd>] do_sync_write+0x8d/0xd0
>> [<ffffffff811fe82d>] vfs_write+0xbd/0x1e0
>> [<ffffffff811ff34f>] SyS_write+0x7f/0xe0
>> [<ffffffff816975c9>] system_call_fastpath+0x16/0x1b
>> [<ffffffffffffffff>] 0xffffffffffffffff
>>
>> The cluster is healthy (all OSDs up, no slow requests, etc.).  More
>> details of my investigation efforts are in the bug report I just
>> submitted:
>>      http://tracker.ceph.com/issues/22008
>>
>> It looks like the fuse client is asking for some caps that it never
>> thinks it receives from the MDS, so the thread waiting for those caps on
>> behalf of the writing client never wakes up.  The restart of the MDS
>> fixes the problem (since ceph-fuse re-negotiates caps).
>>
>> Any ideas/suggestions?
>>
>> Andras
>>
>> _______________________________________________
>> ceph-users mailing list
>> ceph-users at lists.ceph.com
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
>
>
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