Related to https://bugzilla.opensuse.org/show_bug.cgi?id=962250 but still
present in 4.11.3

Tumbleweed latest (08.06.2017) x86_64

1 of 5 suspend trials result in this error

dmesg:
[24442.429942] Freezing of tasks failed after 20.007 seconds (1 tasks refusing
to freeze, wq_busy=0):                                                          
[24442.429972] xfsaild/sda2    D    0   285      2 0x00000000
[24442.429977] Call Trace:
[24442.429991]  __schedule+0x236/0x8f0
[24442.430006]  ? queue_unplugged+0x25/0xb0
[24442.430013]  schedule+0x3d/0x90
[24442.430021]  schedule_timeout+0x210/0x310
[24442.430026]  ? blk_finish_plug+0x27/0x40
[24442.430094]  ? _xfs_buf_ioapply+0x33d/0x480 [xfs]
[24442.430101]  ? wait_for_completion+0xef/0x150
[24442.430106]  ? wait_for_completion+0xef/0x150
[24442.430111]  ? wake_up_q+0x80/0x80
[24442.430168]  ? xfs_buf_read_map+0x10d/0x190 [xfs]
[24442.430217]  ? xfs_buf_submit_wait+0x7e/0x250 [xfs]
[24442.430264]  ? xfs_buf_read_map+0x10d/0x190 [xfs]
[24442.430327]  ? xfs_trans_read_buf_map+0xac/0x330 [xfs]
[24442.430386]  ? xfs_trans_read_buf_map+0xac/0x330 [xfs]
[24442.430436]  ? xfs_imap_to_bp+0x57/0xd0 [xfs]
[24442.430493]  ? xfs_iflush+0xe4/0x1f0 [xfs]
[24442.430553]  ? xfs_inode_item_push+0xcb/0x120 [xfs]
[24442.430635]  ? xfsaild+0x221/0x790 [xfs]
[24442.430699]  ? xfs_trans_ail_cursor_first+0x80/0x80 [xfs]
[24442.430704]  ? kthread+0x118/0x130
[24442.430708]  ? kthread+0x118/0x130
[24442.430713]  ? kthread_create_on_node+0x40/0x40
[24442.430718]  ? ret_from_fork+0x26/0x40
[24442.430903] Restarting kernel threads ... done.