On 10/1/21 9:01 AM, torvic9@xxxxxxxxxxx wrote: >> torvic9@xxxxxxxxxxx hat am 30.09.2021 09:44 geschrieben: >> >> >> 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 > > I have now reverted the above commit and launched some heavy I/O like > e.g. git kernel, fio, xz compression, and so far, no freezes anymore! > Too early to say that this commit really is the cause though. > Would be great if someone could have a look at it. It's known buggy, and a revert has been queued up since earlier this week. It'll go to Linus for 5.15-rc4, and will hit 5.14 stable shortly thereafter. -- Jens Axboe
