Hello, I encounter a hard freeze on both 5.14 and 5.15 when using BFQ. Unfortunately, I do not have a full error log, because the computer totally freezes and slightly corrupts the display, so it's impossible to read the entire message. However, what I could get is the following: kernel BUG at mm/slub.c:379 invalid opcode: 0000 [#1] RIP: 0010:__slab_free [...] Call Trace: bfq_set_next_ioprio_data [...] bfq_put_queue bfq_insert_requests [...] This issue appears more or less randomly and it sometimes takes a little while to reproduce it (running fio helps). The call trace always contains references to BFQ, but they are not always the exact same. Once, I could see on the corrupted display the message "general protection fault". I could reproduce this issue on two computers. Not quite sure but I *think* the issue first appeared somewhere around 5.14.5 or 5.14.6, during which time BFQ only got the following commit: (88013a0c5d99) block, bfq: honor already-setup queue merges 5.13 doesn't seem to be affected AFAICS. Does anyone have an idea what is going on? I will now revert the above commit and see if that helps... Thanks, Tor
