[Bug 1809748] Re: 8k bcache NULL pointer deref on mount / can't boot

after doing a wipefs on the cache drive the BUG still occured; wipefs's
the backing drive corrected that. I haven't yet tried wiping just the
backing drive.

** Summary changed:

- 8k bcache cache NULL pointer deref on mount / can't boot
+ 8k bcache NULL pointer deref on mount / can't boot

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https://bugs.launchpad.net/bugs/1809748

Title:
8k bcache NULL pointer deref on mount / can't boot

Status in linux package in Ubuntu:
Confirmed

Bug description:
After creating a bcache cache device with an 8k block size (see
#1662407), a kernel oops happens every time device is probed.

I'm not sure that there is any userspace bug present in #1662407 at
all - it may just be kernel. I've attached a dmesg there, but can't
actually get into the system at the moment to get apport-collect or
other diagnostics.

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