[Gluster-devel] [Gluster-users] GlusterFS FUSE client hangs on rsyncing lots of file

Pranith Kumar Karampuri pkarampu at redhat.com
Thu Jan 28 09:31:10 UTC 2016 


On 01/28/2016 02:59 PM, baul jianguo wrote:
> http://pastebin.centos.org/38941/
> client statedump,only the pid 27419,168030,208655 hang，you can search
> this pid in the statedump file。
Could you take one more statedump please?

Pranith
>
> On Wed, Jan 27, 2016 at 4:35 PM, Pranith Kumar Karampuri
> <pkarampu at redhat.com> wrote:
>> Hi,
>>        If the hang appears on enabling client side io-threads then it could
>> be because of some race that is seen when io-threads is enabled on the
>> client side. 2 things will help us debug this issue:
>> 1) thread apply all bt inside gdb (with debuginfo rpms/debs installed )
>> 2) Complete statedump of the mount at two intervals preferably 10 seconds
>> apart. It becomes difficult to find out which ones are stuck vs the ones
>> that are on-going when we have just one statedump. If we have two, we can
>> find which frames are common in both of the statedumps and then take a
>> closer look there.
>>
>> Feel free to ping me on #gluster-dev, nick: pranithk if you have the process
>> hung in that state and you guys don't mind me do a live debugging with you
>> guys. This option is the best of the lot!
>>
>> Thanks a lot baul, Oleksandr for the debugging so far!
>>
>> Pranith
>>
>>
>> On 01/25/2016 01:03 PM, baul jianguo wrote:
>>> 3.5.7 also hangs.only the flush op hung. Yes,off the
>>> performance.client-io-threads ,no hang.
>>>
>>> The hang does not relate the client kernel version.
>>>
>>> One client statdump about flush op,any abnormal?
>>>
>>> [global.callpool.stack.12]
>>>
>>> uid=0
>>>
>>> gid=0
>>>
>>> pid=14432
>>>
>>> unique=16336007098
>>>
>>> lk-owner=77cb199aa36f3641
>>>
>>> op=FLUSH
>>>
>>> type=1
>>>
>>> cnt=6
>>>
>>>
>>>
>>> [global.callpool.stack.12.frame.1]
>>>
>>> ref_count=1
>>>
>>> translator=fuse
>>>
>>> complete=0
>>>
>>>
>>>
>>> [global.callpool.stack.12.frame.2]
>>>
>>> ref_count=0
>>>
>>> translator=datavolume-write-behind
>>>
>>> complete=0
>>>
>>> parent=datavolume-read-ahead
>>>
>>> wind_from=ra_flush
>>>
>>> wind_to=FIRST_CHILD (this)->fops->flush
>>>
>>> unwind_to=ra_flush_cbk
>>>
>>>
>>>
>>> [global.callpool.stack.12.frame.3]
>>>
>>> ref_count=1
>>>
>>> translator=datavolume-read-ahead
>>>
>>> complete=0
>>>
>>> parent=datavolume-open-behind
>>>
>>> wind_from=default_flush_resume
>>>
>>> wind_to=FIRST_CHILD(this)->fops->flush
>>>
>>> unwind_to=default_flush_cbk
>>>
>>>
>>>
>>> [global.callpool.stack.12.frame.4]
>>>
>>> ref_count=1
>>>
>>> translator=datavolume-open-behind
>>>
>>> complete=0
>>>
>>> parent=datavolume-io-threads
>>>
>>> wind_from=iot_flush_wrapper
>>>
>>> wind_to=FIRST_CHILD(this)->fops->flush
>>>
>>> unwind_to=iot_flush_cbk
>>>
>>>
>>>
>>> [global.callpool.stack.12.frame.5]
>>>
>>> ref_count=1
>>>
>>> translator=datavolume-io-threads
>>>
>>> complete=0
>>>
>>> parent=datavolume
>>>
>>> wind_from=io_stats_flush
>>>
>>> wind_to=FIRST_CHILD(this)->fops->flush
>>>
>>> unwind_to=io_stats_flush_cbk
>>>
>>>
>>>
>>> [global.callpool.stack.12.frame.6]
>>>
>>> ref_count=1
>>>
>>> translator=datavolume
>>>
>>> complete=0
>>>
>>> parent=fuse
>>>
>>> wind_from=fuse_flush_resume
>>>
>>> wind_to=xl->fops->flush
>>>
>>> unwind_to=fuse_err_cbk
>>>
>>>
>>>
>>> On Sun, Jan 24, 2016 at 5:35 AM, Oleksandr Natalenko
>>> <oleksandr at natalenko.name> wrote:
>>>> With "performance.client-io-threads" set to "off" no hangs occurred in 3
>>>> rsync/rm rounds. Could that be some fuse-bridge lock race? Will bring
>>>> that
>>>> option to "on" back again and try to get full statedump.
>>>>
>>>> On четвер, 21 січня 2016 р. 14:54:47 EET Raghavendra G wrote:
>>>>> On Thu, Jan 21, 2016 at 10:49 AM, Pranith Kumar Karampuri <
>>>>>
>>>>> pkarampu at redhat.com> wrote:
>>>>>> On 01/18/2016 02:28 PM, Oleksandr Natalenko wrote:
>>>>>>> XFS. Server side works OK, I'm able to mount volume again. Brick is
>>>>>>> 30%
>>>>>>> full.
>>>>>> Oleksandr,
>>>>>>
>>>>>>         Will it be possible to get the statedump of the client, bricks
>>>>>>
>>>>>> output next time it happens?
>>>>>>
>>>>>>
>>>>>> https://github.com/gluster/glusterfs/blob/master/doc/debugging/statedump.m
>>>>>> d#how-to-generate-statedump
>>>>> We also need to dump inode information. To do that you've to add
>>>>> "all=yes"
>>>>> to /var/run/gluster/glusterdump.options before you issue commands to get
>>>>> statedump.
>>>>>
>>>>>> Pranith
>>>>>>
>>>>>>> On понеділок, 18 січня 2016 р. 15:07:18 EET baul jianguo wrote:
>>>>>>>> What is your brick file system? and the glusterfsd process and all
>>>>>>>> thread status?
>>>>>>>> I met same issue when client app such as rsync stay in D status,and
>>>>>>>> the brick process and relate thread also be in the D status.
>>>>>>>> And the brick dev disk util is 100% .
>>>>>>>>
>>>>>>>> On Sun, Jan 17, 2016 at 6:13 AM, Oleksandr Natalenko
>>>>>>>>
>>>>>>>> <oleksandr at natalenko.name> wrote:
>>>>>>>>> Wrong assumption, rsync hung again.
>>>>>>>>>
>>>>>>>>> On субота, 16 січня 2016 р. 22:53:04 EET Oleksandr Natalenko wrote:
>>>>>>>>>> One possible reason:
>>>>>>>>>>
>>>>>>>>>> cluster.lookup-optimize: on
>>>>>>>>>> cluster.readdir-optimize: on
>>>>>>>>>>
>>>>>>>>>> I've disabled both optimizations, and at least as of now rsync
>>>>>>>>>> still
>>>>>>>>>> does
>>>>>>>>>> its job with no issues. I would like to find out what option causes
>>>>>>>>>> such
>>>>>>>>>> a
>>>>>>>>>> behavior and why. Will test more.
>>>>>>>>>>
>>>>>>>>>> On пʼятниця, 15 січня 2016 р. 16:09:51 EET Oleksandr Natalenko
>>>>>>>>>> wrote:
>>>>>>>>>>> Another observation: if rsyncing is resumed after hang, rsync
>>>>>>>>>>> itself
>>>>>>>>>>> hangs a lot faster because it does stat of already copied files.
>>>>>>>>>>> So,
>>>>>>>>>>> the
>>>>>>>>>>> reason may be not writing itself, but massive stat on GlusterFS
>>>>>>>>>>> volume
>>>>>>>>>>> as well.
>>>>>>>>>>>
>>>>>>>>>>> 15.01.2016 09:40, Oleksandr Natalenko написав:
>>>>>>>>>>>> While doing rsync over millions of files from ordinary partition
>>>>>>>>>>>> to
>>>>>>>>>>>> GlusterFS volume, just after approx. first 2 million rsync hang
>>>>>>>>>>>> happens, and the following info appears in dmesg:
>>>>>>>>>>>>
>>>>>>>>>>>> ===
>>>>>>>>>>>> [17075038.924481] INFO: task rsync:10310 blocked for more than
>>>>>>>>>>>> 120
>>>>>>>>>>>> seconds.
>>>>>>>>>>>> [17075038.931948] "echo 0 >
>>>>>>>>>>>> /proc/sys/kernel/hung_task_timeout_secs"
>>>>>>>>>>>> disables this message.
>>>>>>>>>>>> [17075038.940748] rsync           D ffff88207fc13680     0 10310
>>>>>>>>>>>> 10309 0x00000080
>>>>>>>>>>>> [17075038.940752]  ffff8809c578be18 0000000000000086
>>>>>>>>>>>> ffff8809c578bfd8
>>>>>>>>>>>> 0000000000013680
>>>>>>>>>>>> [17075038.940756]  ffff8809c578bfd8 0000000000013680
>>>>>>>>>>>> ffff880310cbe660
>>>>>>>>>>>> ffff881159d16a30
>>>>>>>>>>>> [17075038.940759]  ffff881e3aa25800 ffff8809c578be48
>>>>>>>>>>>> ffff881159d16b10
>>>>>>>>>>>> ffff88087d553980
>>>>>>>>>>>> [17075038.940762] Call Trace:
>>>>>>>>>>>> [17075038.940770]  [<ffffffff8160a1d9>] schedule+0x29/0x70
>>>>>>>>>>>> [17075038.940797]  [<ffffffffa023a53d>]
>>>>>>>>>>>> __fuse_request_send+0x13d/0x2c0
>>>>>>>>>>>> [fuse]
>>>>>>>>>>>> [17075038.940801]  [<ffffffffa023db30>] ?
>>>>>>>>>>>> fuse_get_req_nofail_nopages+0xc0/0x1e0 [fuse]
>>>>>>>>>>>> [17075038.940805]  [<ffffffff81098350>] ? wake_up_bit+0x30/0x30
>>>>>>>>>>>> [17075038.940809]  [<ffffffffa023a6d2>]
>>>>>>>>>>>> fuse_request_send+0x12/0x20
>>>>>>>>>>>> [fuse]
>>>>>>>>>>>> [17075038.940813]  [<ffffffffa024382f>] fuse_flush+0xff/0x150
>>>>>>>>>>>> [fuse]
>>>>>>>>>>>> [17075038.940817]  [<ffffffff811c45c4>] filp_close+0x34/0x80
>>>>>>>>>>>> [17075038.940821]  [<ffffffff811e4ed8>] __close_fd+0x78/0xa0
>>>>>>>>>>>> [17075038.940824]  [<ffffffff811c6103>] SyS_close+0x23/0x50
>>>>>>>>>>>> [17075038.940828]  [<ffffffff81614de9>]
>>>>>>>>>>>> system_call_fastpath+0x16/0x1b
>>>>>>>>>>>> ===
>>>>>>>>>>>>
>>>>>>>>>>>> rsync blocks in D state, and to kill it, I have to do umount
>>>>>>>>>>>> --lazy
>>>>>>>>>>>> on
>>>>>>>>>>>> GlusterFS mountpoint, and then kill corresponding client
>>>>>>>>>>>> glusterfs
>>>>>>>>>>>> process. Then rsync exits.
>>>>>>>>>>>>
>>>>>>>>>>>> Here is GlusterFS volume info:
>>>>>>>>>>>>
>>>>>>>>>>>> ===
>>>>>>>>>>>> Volume Name: asterisk_records
>>>>>>>>>>>> Type: Distributed-Replicate
>>>>>>>>>>>> Volume ID: dc1fe561-fa3a-4f2e-8330-ec7e52c75ba4
>>>>>>>>>>>> Status: Started
>>>>>>>>>>>> Number of Bricks: 3 x 2 = 6
>>>>>>>>>>>> Transport-type: tcp
>>>>>>>>>>>> Bricks:
>>>>>>>>>>>> Brick1:
>>>>>>>>>>>>
>>>>>>>>>>>> server1:/bricks/10_megaraid_0_3_9_x_0_4_3_hdd_r1_nolvm_hdd_storage_0
>>>>>>>>>>>> 1
>>>>>>>>>>>> /as
>>>>>>>>>>>> te
>>>>>>>>>>>> risk/records Brick2:
>>>>>>>>>>>>
>>>>>>>>>>>> server2:/bricks/10_megaraid_8_5_14_x_8_6_16_hdd_r1_nolvm_hdd_storage
>>>>>>>>>>>> _
>>>>>>>>>>>> 01/
>>>>>>>>>>>> as
>>>>>>>>>>>> terisk/records Brick3:
>>>>>>>>>>>>
>>>>>>>>>>>> server1:/bricks/11_megaraid_0_5_4_x_0_6_5_hdd_r1_nolvm_hdd_storage_0
>>>>>>>>>>>> 2
>>>>>>>>>>>> /as
>>>>>>>>>>>> te
>>>>>>>>>>>> risk/records Brick4:
>>>>>>>>>>>>
>>>>>>>>>>>> server2:/bricks/11_megaraid_8_7_15_x_8_8_20_hdd_r1_nolvm_hdd_storage
>>>>>>>>>>>> _
>>>>>>>>>>>> 02/
>>>>>>>>>>>> as
>>>>>>>>>>>> terisk/records Brick5:
>>>>>>>>>>>>
>>>>>>>>>>>> server1:/bricks/12_megaraid_0_7_6_x_0_13_14_hdd_r1_nolvm_hdd_storage
>>>>>>>>>>>> _
>>>>>>>>>>>> 03/
>>>>>>>>>>>> as
>>>>>>>>>>>> terisk/records Brick6:
>>>>>>>>>>>>
>>>>>>>>>>>> server2:/bricks/12_megaraid_8_9_19_x_8_13_24_hdd_r1_nolvm_hdd_storag
>>>>>>>>>>>> e
>>>>>>>>>>>> _03
>>>>>>>>>>>> /a
>>>>>>>>>>>> sterisk/records Options Reconfigured:
>>>>>>>>>>>> cluster.lookup-optimize: on
>>>>>>>>>>>> cluster.readdir-optimize: on
>>>>>>>>>>>> client.event-threads: 2
>>>>>>>>>>>> network.inode-lru-limit: 4096
>>>>>>>>>>>> server.event-threads: 4
>>>>>>>>>>>> performance.client-io-threads: on
>>>>>>>>>>>> storage.linux-aio: on
>>>>>>>>>>>> performance.write-behind-window-size: 4194304
>>>>>>>>>>>> performance.stat-prefetch: on
>>>>>>>>>>>> performance.quick-read: on
>>>>>>>>>>>> performance.read-ahead: on
>>>>>>>>>>>> performance.flush-behind: on
>>>>>>>>>>>> performance.write-behind: on
>>>>>>>>>>>> performance.io-thread-count: 2
>>>>>>>>>>>> performance.cache-max-file-size: 1048576
>>>>>>>>>>>> performance.cache-size: 33554432
>>>>>>>>>>>> features.cache-invalidation: on
>>>>>>>>>>>> performance.readdir-ahead: on
>>>>>>>>>>>> ===
>>>>>>>>>>>>
>>>>>>>>>>>> The issue reproduces each time I rsync such an amount of files.
>>>>>>>>>>>>
>>>>>>>>>>>> How could I debug this issue better?
>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>> Gluster-users mailing list
>>>>>>>>>>>> Gluster-users at gluster.org
>>>>>>>>>>>> http://www.gluster.org/mailman/listinfo/gluster-users
>>>>>>>>>>> _______________________________________________
>>>>>>>>>>> Gluster-devel mailing list
>>>>>>>>>>> Gluster-devel at gluster.org
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