Comment 13 for bug 1837788

Verification successful with disco-proposed.
No warning nor oops anymore.

# rmadison -s disco-proposed linux
 linux | 5.0.0-26.27 | disco-proposed | source

# uname -rv
5.0.0-26-generic #27-Ubuntu SMP Tue Aug 13 17:47:39 UTC 2019

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
[ 171.879953] bcache: register_bdev() registered backing device loop0
[ 171.920116] bcache: run_cache_set() invalidating existing data
[ 171.931843] bcache: register_cache() registered cache device loop1
[ 175.906911] bcache: bch_cached_dev_attach() Caching loop0 as bcache0 on set 18fa9221-da9c-4e69-8b23-6eb093030c30

# reboot
# # comment last line in script.

# ./setup-bcache-wb_percent-before-attach.sh >/dev/null 2>&1
[ 91.990987] bcache: register_bdev() registered backing device loop0
[ 94.001825] bcache: run_cache_set() invalidating existing data
[ 94.018920] bcache: register_cache() registered cache device loop1
# sleep 10
#