Comment 9 for bug 1867916

I can confirm going from 4.15.0-88 to 4.15.0-91 on my bcache system panics in the same way. Here's my layout:

-> sd{c,d,f,g,h}: each 4TB gpt, sd{c,d,f,g,h}1: each type linux_raid_member
--> md0: raid6, sd{c,d,f,g,h}1
--> sda: 512GB gpt, sda1: type bcache
---> bcache0: md0 + sda1
----> whatadisk_crypt: LUKS on bcache0
-----> LVM VG whatadisk: whatadisk_crypt
------> multiple LVs

There are also a handful of other disks (for example, nvme0n1 is the encrypted boot disk), but the layout above is the only part which bcache touches.

Happy to help with additional info or testing, please let me know.