dmsetup remove a flashcache device whose cache mode is writethrough or writearound would hang or reboot the host

[areschen2015]

[root@stor01 ~]# flashcache_create -p thru -b 8k cachethru /dev/vgssd101/lvssd /dev/vgdata101/lvhdd
cachedev cachethru, ssd_devname /dev/vgssd101/lvssd, disk_devname /dev/vgdata101/lvhdd cache mode WRITE_THROUGH
block_size 16, cache_size 0
ISE metadata will use 30MB of your 7822MB main memory
[root@stor01 ~]# dmsetup table cachethru
0 209715200 ise conf:
ssd dev (/dev/vgssd101/lvssd), disk dev (/dev/vgdata101/lvhdd) cache mode(WRITE_THROUGH)
capacity(10240M), associativity(512), data block size(8K)
skip sequential thresh(0K)
total blocks(1310720), cached blocks(0), cache percent(0)
nr_queued(0)
Size Hist: 512:369097 4096:4974564
[root@stor01 ~]# dmsetup remove cachethru

Then the host hangs without no response.
Other host would reboot without any messages in /var/log/messages, and this cache device is removed successfully.
The same issue as writearound.