> Il giorno 1 ott 2021, alle ore 17:01, torvic9@xxxxxxxxxxx ha scritto: > >> 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. > Hi, sorry for the delay and that you very much for reporting this crash. I have prepared a dev version of BFQ, to try to solve this problem. It's based on a 5.12.0, and should hopefully provide more information upon failure. Could you please give it a try? You can find it here: https://github.com/Algodev-github/bfq-mq/tree/dev-bfq-on-5.12 Thanks for your help, Paolo >> >> 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
