On Thu, Mar 18, 2021 at 6:00 PM Bart Van Assche [off-list ref] wrote:

Multiple users have reported use-after-free complaints similar to the
following (see also https://lore.kernel.org/linux-block/1545261885.185366.488.camel@acm.org/ (local)):

This fixes the crashes I was seeing. I also looked over the patch and
the dereferencing rules seem correct, although that q_usage_counter
check in the bad case seems racy itself? Thanks!
Reviewed-By: Khazhismel Kumykov <redacted>