The kworker was unresponsive when using 3rd party module dtfilter in Red Hat Enterprise Linux.

Issue

• Hung occurs on the task kworker.

[152384.615837] SEOS Syscall Monitor - ACTIVATED
[159703.456565] INFO: task kworker/u66:0:27600 blocked for more than 120 seconds.
[159703.464063] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[159703.472251] kworker/u66:0   D ffffffff8168be60     0 27600      2 0x00000000
[159703.479574] Workqueue: writeback bdi_writeback_workfn (flush-253:41)
[159703.486193]  ffff881809b83978 0000000000000046 ffff8816e9210000 ffff881809b83fd8
[159703.493996]  ffff881809b83fd8 ffff881809b83fd8 ffff8816e9210000 0000000000000002
[159703.501797]  0000000000000002 ffff881809b83a08 ffff88183ffbc9c8 ffffffff8168be60
[159703.509601] Call Trace:
[159703.512267]  [<ffffffff8168be60>] ? out_of_line_wait_on_atomic_t+0x100/0x100
[159703.519556]  [<ffffffff8168de59>] schedule+0x29/0x70
[159703.524753]  [<ffffffff8168be71>] bit_wait+0x11/0x50
[159703.529943]  [<ffffffff8168b9e5>] __wait_on_bit+0x65/0x90
[159703.535577]  [<ffffffffa03fd2a8>] ? QueueDoIoControl+0x78/0x90 [dtrep]
[159703.542351]  [<ffffffff812291b0>] __inode_wait_for_writeback+0xb0/0xf0
[159703.549122]  [<ffffffff810b1c30>] ? wake_bit_function+0x40/0x40
[159703.555277]  [<ffffffff8122c776>] inode_wait_for_writeback+0x26/0x40
[159703.561869]  [<ffffffff8121ac65>] evict+0x95/0x170
[159703.566887]  [<ffffffff8121b515>] iput+0xf5/0x180
[159703.571821]  [<ffffffff81215ff8>] dentry_kill+0x168/0x1b0
[159703.577450]  [<ffffffff8121609c>] dput+0x5c/0xd0
[159703.582295]  [<ffffffffa03f03fc>] superWriteInodeHook+0x14c/0x200 [dtfilter]
[159703.589584]  [<ffffffff812293f7>] __writeback_single_inode+0x167/0x210
[159703.596350]  [<ffffffff81229fbe>] writeback_sb_inodes+0x25e/0x420
[159703.602682]  [<ffffffff8122a21f>] __writeback_inodes_wb+0x9f/0xd0
[159703.609011]  [<ffffffff8122aa63>] wb_writeback+0x263/0x2f0
[159703.614731]  [<ffffffff8121931c>] ? get_nr_inodes+0x4c/0x70
[159703.620534]  [<ffffffff8122ca5b>] bdi_writeback_workfn+0x2cb/0x460
[159703.626950]  [<ffffffff810a849b>] process_one_work+0x17b/0x470
[159703.633014]  [<ffffffff810a92d6>] worker_thread+0x126/0x410
[159703.638817]  [<ffffffff810a91b0>] ? rescuer_thread+0x460/0x460
[159703.644882]  [<ffffffff810b0a9f>] kthread+0xcf/0xe0
[159703.649987]  [<ffffffff810b09d0>] ? kthread_create_on_node+0x140/0x140
[159703.656753]  [<ffffffff81698d98>] ret_from_fork+0x58/0x90
[159703.662381]  [<ffffffff810b09d0>] ? kthread_create_on_node+0x140/0x140