> Il giorno 1 apr 2019, alle ore 10:55, Dmitrii Tcvetkov <demfloro@xxxxxxxxxxx> ha scritto: > > On Mon, 1 Apr 2019 09:29:16 +0200 > Paolo Valente <paolo.valente@xxxxxxxxxx> wrote: >> >> >>> Il giorno 29 mar 2019, alle ore 15:10, Jens Axboe <axboe@xxxxxxxxx> >>> ha scritto: >>> >>> On 3/29/19 7:02 AM, Dmitrii Tcvetkov wrote: >>>> Hi, >>>> >>>> I got kernel panic since v5.1-rc1 when working with files on block >>>> device with BFQ scheduler assigned. I didn't find trivial way to >>>> reproduce the panic but "git checkout origin/linux-5.0.y" >>>> on linux-stable-rc[1] git repo on btrfs filesystem reproduces the >>>> problem 100% of the time on my bare-metal machine and in a VM. >>>> >>>> Bisect led me to commit 9dee8b3b057e1 (block, bfq: fix queue >>>> removal from weights tree). After reverting this commit on top of >>>> current mainline master(9936328b41ce) I can't reproduce the >>>> problem. >>>> >>>> dmesg with the panic and bisect log attached. >>>> >>>> [1] >>>> https://kernel.googlesource.com/pub/scm/linux/kernel/git/stable/linux-stable-rc.git >>> >>> Paolo, can you please take a look at this? >>> >>> >> >> Yep. >> >> That you very much Dmitrii for also bisecting. I feel like this >> failure may be caused by the typo fixed by this patch: >> https://patchwork.kernel.org/patch/10877113/ >> >> Could you please give this fix a try? > > Still reproduces with the patch on top of current mainline > master(v5.1-rc3). > > Crashes with and without CONFIG_BFQ_GROUP_IOSCHED look same to me. > Original dmesg was also from kernel with CONFIG_BFQ_GROUP_IOSCHED=n. > > gpf.txt contains crash with the patch and CONFIG_BFQ_GROUP_IOSCHED=n > gpf-w-bfq-group-iosched.txt - with the patch and CONFIG_BFQ_GROUP_IOSCHED=y > config.txt - kernel config for the VM with CONFIG_BFQ_GROUP_IOSCHED=n > > Ok, thank you. Could you please do a list *(bfq_bfqq_expire+0x1f3) for me? Thanks, Paolo > > <gpf.txt><gpf-w-bfq-group-iosched.txt><config.txt>
