The deadlock in this patchset reproduces upstream. It is not possible to
update the kernel in the env in the original report.
So IFF we assume that this does not reproduce in upstream (pending
proof), is there something that we can do with stable fixes? This will
probably go back to everything that is before 5.8...
The direct_make_request removal should be pretty easily backportable.
Umm, the direct_make_request removal is based on the submit_bio_noacct
rework you've done. Are you suggesting that we replace it with
generic_make_request for these kernels?
In old kernels without the streamlined normal path it might cause minor
performance degradations, but the actual change should be trivial.
That is better than getting stuck in I/O failover...
