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

Pranith Kumar Karampuri pkarampu at redhat.com
Thu Jan 28 11:35:44 UTC 2016 

With baul jianguo's help I am able to see that FLUSH fops are hanging 
for some reason.

pk1 at localhost - ~/Downloads
17:02:13 :) ⚡ grep "unique=" client-dump1.txt
unique=3160758373
unique=2073075682
unique=1455047665
unique=0

pk1 at localhost - ~/Downloads
17:02:21 :) ⚡ grep "unique=" client-dump-0.txt
unique=3160758373
unique=2073075682
unique=1455047665
unique=0

I will be debugging a bit more and post my findings.

Pranith
On 01/28/2016 03:18 PM, baul jianguo wrote:
> the client glusterfs gdb info， main thread id is 70800。
>   In the top output，70800 thread time 1263:30，70810 thread time
> 1321:10，other thread time too small。
> (gdb) thread apply all bt
>
>
>
> Thread 9 (Thread 0x7fc21acaf700 (LWP 70801)):
>
> #0  0x00007fc21cc0c535 in sigwait () from /lib64/libpthread.so.0
>
> #1  0x000000000040539b in glusterfs_sigwaiter (arg=<value optimized
> out>) at glusterfsd.c:1653
>
> #2  0x00007fc21cc04a51 in start_thread () from /lib64/libpthread.so.0
>
> #3  0x00007fc21c56e93d in clone () from /lib64/libc.so.6
>
>
>
> Thread 8 (Thread 0x7fc21a2ae700 (LWP 70802)):
>
> #0  0x00007fc21cc08a0e in pthread_cond_timedwait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
>
> #1  0x00007fc21ded02bf in syncenv_task (proc=0x121ee60) at syncop.c:493
>
> #2  0x00007fc21ded6300 in syncenv_processor (thdata=0x121ee60) at syncop.c:571
>
> #3  0x00007fc21cc04a51 in start_thread () from /lib64/libpthread.so.0
>
> #4  0x00007fc21c56e93d in clone () from /lib64/libc.so.6
>
>
>
> Thread 7 (Thread 0x7fc2198ad700 (LWP 70803)):
>
> #0  0x00007fc21cc08a0e in pthread_cond_timedwait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
>
> #1  0x00007fc21ded02bf in syncenv_task (proc=0x121f220) at syncop.c:493
>
> #2  0x00007fc21ded6300 in syncenv_processor (thdata=0x121f220) at syncop.c:571
>
> #3  0x00007fc21cc04a51 in start_thread () from /lib64/libpthread.so.0
>
> #4  0x00007fc21c56e93d in clone () from /lib64/libc.so.6
>
>
>
> Thread 6 (Thread 0x7fc21767d700 (LWP 70805)):
>
> #0  0x00007fc21cc0bfbd in nanosleep () from /lib64/libpthread.so.0
>
> #1  0x00007fc21deb16bc in gf_timer_proc (ctx=0x11f2010) at timer.c:170
>
> #2  0x00007fc21cc04a51 in start_thread () from /lib64/libpthread.so.0
>
> #3  0x00007fc21c56e93d in clone () from /lib64/libc.so.6
>
>
>
> Thread 5 (Thread 0x7fc20fb1e700 (LWP 70810)):
>
> #0  0x00007fc21c566987 in readv () from /lib64/libc.so.6
>
> #1  0x00007fc21accbc55 in fuse_thread_proc (data=0x120f450) at
> fuse-bridge.c:4752
>
> #2  0x00007fc21cc04a51 in start_thread () from /lib64/libpthread.so.0
>
> #3  0x00007fc21c56e93d in clone () from /lib64/libc.so.6 时间最多
>
>
>
> Thread 4 (Thread 0x7fc20f11d700 (LWP 70811)): 少点
>
> #0  0x00007fc21cc0b7dd in read () from /lib64/libpthread.so.0
>
> #1  0x00007fc21acc0e73 in read (data=<value optimized out>) at
> /usr/include/bits/unistd.h:45
>
> #2  notify_kernel_loop (data=<value optimized out>) at fuse-bridge.c:3786
>
> #3  0x00007fc21cc04a51 in start_thread () from /lib64/libpthread.so.0
>
> #4  0x00007fc21c56e93d in clone () from /lib64/libc.so.6
>
>
>
> Thread 3 (Thread 0x7fc1b16fe700 (LWP 206224)):
>
> ---Type <return> to continue, or q <return> to quit---
>
> #0  0x00007fc21cc08a0e in pthread_cond_timedwait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
>
> #1  0x00007fc20e515e60 in iot_worker (data=0x19eeda0) at io-threads.c:157
>
> #2  0x00007fc21cc04a51 in start_thread () from /lib64/libpthread.so.0
>
> #3  0x00007fc21c56e93d in clone () from /lib64/libc.so.6
>
>
>
> Thread 2 (Thread 0x7fc1b0bfb700 (LWP 214361)):
>
> #0  0x00007fc21cc08a0e in pthread_cond_timedwait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
>
> #1  0x00007fc20e515e60 in iot_worker (data=0x19eeda0) at io-threads.c:157
>
> #2  0x00007fc21cc04a51 in start_thread () from /lib64/libpthread.so.0
>
> #3  0x00007fc21c56e93d in clone () from /lib64/libc.so.6
>
>
>
> Thread 1 (Thread 0x7fc21e31e700 (LWP 70800)):
>
> #0  0x00007fc21c56ef33 in epoll_wait () from /lib64/libc.so.6
>
> #1  0x00007fc21deea3e7 in event_dispatch_epoll (event_pool=0x120dec0)
> at event-epoll.c:428
>
> #2  0x00000000004075e4 in main (argc=4, argv=0x7fff3dc93698) at
> glusterfsd.c:1983
>
> On Thu, Jan 28, 2016 at 5:29 PM, baul jianguo <roidinev at gmail.com> wrote:
>> http://pastebin.centos.org/38941/
>> client statedump,only the pid 27419,168030,208655 hang，you can search
>> this pid in the statedump file。
>>
>> 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
>>>>>>>>>>>> http://www.gluster.org/mailman/listinfo/gluster-devel
>>>>>>>>>>> _______________________________________________
>>>>>>>>>>> Gluster-devel mailing list
>>>>>>>>>>> Gluster-devel at gluster.org
>>>>>>>>>>> http://www.gluster.org/mailman/listinfo/gluster-devel
>>>>>>>>>> _______________________________________________
>>>>>>>>>> Gluster-devel mailing list
>>>>>>>>>> Gluster-devel at gluster.org
>>>>>>>>>> http://www.gluster.org/mailman/listinfo/gluster-devel
>>>>>>>> _______________________________________________
>>>>>>>> Gluster-users mailing list
>>>>>>>> Gluster-users at gluster.org
>>>>>>>> http://www.gluster.org/mailman/listinfo/gluster-users
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>>>>>>> http://www.gluster.org/mailman/listinfo/gluster-devel
>>>>>

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