[RHEL 7] Snapshot operation failed on VMWare ESXi led to VM hang.

Issue

• Snapshot attempt failed on VMWare ESXi led to VM hang.

[10068326.501279] device-mapper: thin: Deletion of thin device 2451459 failed.
[10069223.427935] device-mapper: thin: Deletion of thin device 2451595 failed.
[10070474.572672] device-mapper: thin: Deletion of thin device 2451787 failed.
[10070961.544940] device-mapper: thin: Deletion of thin device 2451841 failed.
[10073588.039242] device-mapper: thin: Deletion of thin device 2452232 failed.
[10074004.710749] INFO: task pool:15578 blocked for more than 120 seconds.
[10074004.710804] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[10074004.710832] pool            D ffff8dcd7d85acc0     0 15578      1 0x00000080
[10074004.710836] Call Trace:
[10074004.710846]  [<ffffffff8db86dc9>] schedule+0x29/0x70
[10074004.710908]  [<ffffffffc0707d3c>] xfs_log_force_lsn+0x32c/0x370 [xfs]
[10074004.710926]  [<ffffffffc0702fb3>] __xfs_trans_commit+0x203/0x260 [xfs]
[10074004.710937]  [<ffffffffc07032d0>] xfs_trans_commit+0x10/0x20 [xfs]
[10074004.710949]  [<ffffffffc06da2d2>] xfs_sync_sb+0x72/0x80 [xfs]
[10074004.710961]  [<ffffffffc06fcb93>] xfs_log_sbcount+0x53/0x60 [xfs]
[10074004.710973]  [<ffffffffc07001a0>] xfs_quiesce_attr+0x60/0xb0 [xfs]
[10074004.710982]  [<ffffffffc0700471>] xfs_fs_freeze+0x21/0x40 [xfs]
[10074004.710986]  [<ffffffff8d65108b>] freeze_super+0xbb/0x130
[10074004.710989]  [<ffffffff8d663534>] do_vfs_ioctl+0x414/0x5b0
[10074004.710993]  [<ffffffff8d663771>] SyS_ioctl+0xa1/0xc0
[10074004.710997]  [<ffffffff8db93f92>] system_call_fastpath+0x25/0x2a