[Ocfs2-devel] Reflink hangs with kernel 4.4

[서정우]

Hi all.

 I built up ocfs2 on drbd dual primary.
Each node has 12 disks of Raid 10 with mdadm chuck size 4096k.
Cluster size of filesystem is 1048576 bytes.

Main purpose of use is reflink files on drbd.

I reflinked files from 1TB file and exported them to LIO iscsi.

After few days tests, i got kernel error.



May  4 19:29:38 master kernel: [1283940.130689]
(reflink,30902,0):ocfs2_check_dir_for_entry:2048 ERROR: status = -17
May  4 19:29:38 master kernel: [1283940.131122]
(reflink,30902,0):ocfs2_mv_orphaned_inode_to_new:2917 ERROR: status = -17
May  4 19:29:38 master kernel: [1283940.131533]
(reflink,30902,0):ocfs2_reflink:4317 ERROR: status = -17
May  4 21:15:29 master kernel: [1290290.387752] INFO: task reflink:5954
blocked for more than 120 seconds.
May  4 21:15:29 master kernel: [1290290.388093]       Not tainted
4.4.7-040407-generic #201604121331
May  4 21:15:29 master kernel: [1290290.388417] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May  4 21:15:29 master kernel: [1290290.388784] reflink         D
ffff880037e83cf8     0  5954  25468 0x00000000
May  4 21:15:29 master kernel: [1290290.388788]  ffff880037e83cf8
ffff8800b80e6000 ffff8802156ae040 ffff88000195d280
May  4 21:15:29 master kernel: [1290290.388790]  ffff880037e84000
ffff8801af84f1dc ffff88000195d280 00000000ffffffff
May  4 21:15:29 master kernel: [1290290.388792]  ffff8801af84f1e0
ffff880037e83d10 ffffffff817fdf35 ffff8801af84f1d8
May  4 21:15:29 master kernel: [1290290.388793] Call Trace:
May  4 21:15:29 master kernel: [1290290.388798]  [<ffffffff817fdf35>]
schedule+0x35/0x80
May  4 21:15:29 master kernel: [1290290.388800]  [<ffffffff817fe1de>]
schedule_preempt_disabled+0xe/0x10
May  4 21:15:29 master kernel: [1290290.388802]  [<ffffffff817ffe19>]
__mutex_lock_slowpath+0xb9/0x130
May  4 21:15:29 master kernel: [1290290.388803]  [<ffffffff817ffeaf>]
mutex_lock+0x1f/0x30
May  4 21:15:29 master kernel: [1290290.388832]  [<ffffffffc0a02668>]
ocfs2_reflink_ioctl+0x218/0x360 [ocfs2]
May  4 21:15:29 master kernel: [1290290.388848]  [<ffffffffc09e634e>]
ocfs2_ioctl+0x26e/0x660 [ocfs2]
May  4 21:15:29 master kernel: [1290290.388851]  [<ffffffff8121aa68>]
do_vfs_ioctl+0x298/0x480
May  4 21:15:29 master kernel: [1290290.388853]  [<ffffffff812167a4>] ?
putname+0x54/0x60
May  4 21:15:29 master kernel: [1290290.388854]  [<ffffffff812066bf>] ?
do_sys_open+0x1af/0x230
May  4 21:15:29 master kernel: [1290290.388856]  [<ffffffff8121acc9>]
SyS_ioctl+0x79/0x90
May  4 21:15:29 master kernel: [1290290.388858]  [<ffffffff81802036>]
entry_SYSCALL_64_fastpath+0x16/0x75
May  4 21:15:29 master kernel: [1290290.388860] INFO: task reflink:6466
blocked for more than 120 seconds.
May  4 21:15:29 master kernel: [1290290.389236]       Not tainted
4.4.7-040407-generic #201604121331
May  4 21:15:29 master kernel: [1290290.389611] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May  4 21:15:29 master kernel: [1290290.389998] reflink         D
ffff880038f87cf8     0  6466  32643 0x00000000
May  4 21:15:29 master kernel: [1290290.390000]  ffff880038f87cf8
ffff8800b80e6000 ffff880215542940 ffff880002508dc0
May  4 21:15:29 master kernel: [1290290.390002]  ffff880038f88000
ffff8801af84f1dc ffff880002508dc0 00000000ffffffff
May  4 21:15:29 master kernel: [1290290.390004]  ffff8801af84f1e0
ffff880038f87d10 ffffffff817fdf35 ffff8801af84f1d8
May  4 21:15:29 master kernel: [1290290.390005] Call Trace:
May  4 21:15:29 master kernel: [1290290.390008]  [<ffffffff817fdf35>]
schedule+0x35/0x80
May  4 21:15:29 master kernel: [1290290.390009]  [<ffffffff817fe1de>]
schedule_preempt_disabled+0xe/0x10
May  4 21:15:29 master kernel: [1290290.390010]  [<ffffffff817ffe19>]
__mutex_lock_slowpath+0xb9/0x130
May  4 21:15:29 master kernel: [1290290.390012]  [<ffffffff817ffeaf>]
mutex_lock+0x1f/0x30
May  4 21:15:29 master kernel: [1290290.390031]  [<ffffffffc0a02668>]
ocfs2_reflink_ioctl+0x218/0x360 [ocfs2]
May  4 21:15:29 master kernel: [1290290.390045]  [<ffffffffc09e634e>]
ocfs2_ioctl+0x26e/0x660 [ocfs2]
May  4 21:15:29 master kernel: [1290290.390048]  [<ffffffff8121aa68>]
do_vfs_ioctl+0x298/0x480
May  4 21:15:29 master kernel: [1290290.390049]  [<ffffffff812167a4>] ?
putname+0x54/0x60
May  4 21:15:29 master kernel: [1290290.390051]  [<ffffffff812066bf>] ?
do_sys_open+0x1af/0x230
May  4 21:15:29 master kernel: [1290290.390052]  [<ffffffff8121acc9>]
SyS_ioctl+0x79/0x90
May  4 21:15:29 master kernel: [1290290.390054]  [<ffffffff81802036>]
entry_SYSCALL_64_fastpath+0x16/0x75


 I saw same report with kernel 4.3 but there was no answer.
Any ideas?
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