On 4/30/21 4:02 PM, Palash Oswal wrote: > On Fri, Apr 30, 2021 at 8:03 PM Pavel Begunkov <asml.silence@xxxxxxxxx> wrote: >> >> On 4/30/21 3:21 PM, Palash Oswal wrote: >>> On Thursday, March 18, 2021 at 9:40:21 PM UTC+5:30 syzbot wrote: >>>> >>>> Hello, >>>> >>>> syzbot found the following issue on: >>>> >>>> HEAD commit: 0d7588ab riscv: process: Fix no prototype for arch_dup_tas.. >>>> git tree: git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git fixes >>>> console output: https://syzkaller.appspot.com/x/log.txt?x=12dde5aed00000 >>>> kernel config: https://syzkaller.appspot.com/x/.config?x=81c0b708b31626cc >>>> dashboard link: https://syzkaller.appspot.com/bug?extid=11bf59db879676f59e52 >>>> userspace arch: riscv64 >>>> CC: [asml.s...@xxxxxxxxx ax...@xxxxxxxxx io-u...@xxxxxxxxxxxxxxx linux-...@xxxxxxxxxxxxxxx] >>>> >>>> Unfortunately, I don't have any reproducer for this issue yet. >> >> There was so many fixes in 5.12 after this revision, including sqpoll >> cancellation related... Can you try something more up-to-date? Like >> released 5.12 or for-next >> > > The reproducer works for 5.12. Tried 5.12, [ 245.467397] INFO: task iou-sqp-2018:2019 blocked for more than 122 seconds. [ 245.467424] Call Trace: [ 245.467432] __schedule+0x365/0x960 [ 245.467444] schedule+0x68/0xe0 [ 245.467450] io_uring_cancel_sqpoll+0xdb/0x110 [ 245.467461] ? wait_woken+0x80/0x80 [ 245.467472] io_sq_thread+0x1c6/0x6c0 [ 245.467482] ? wait_woken+0x80/0x80 [ 245.467491] ? finish_task_switch.isra.0+0xca/0x2e0 [ 245.467497] ? io_wq_submit_work+0x140/0x140 [ 245.467506] ret_from_fork+0x22/0x30 [ 245.467520] INFO: task iou-sqp-2052:2053 blocked for more than 122 seconds. [ 245.467536] Call Trace: [ 245.467539] __schedule+0x365/0x960 [ 245.467545] schedule+0x68/0xe0 [ 245.467550] io_uring_cancel_sqpoll+0xdb/0x110 [ 245.467559] ? wait_woken+0x80/0x80 [ 245.467568] io_sq_thread+0x1c6/0x6c0 [ 245.467577] ? wait_woken+0x80/0x80 [ 245.467586] ? finish_task_switch.isra.0+0xca/0x2e0 [ 245.467591] ? io_wq_submit_work+0x140/0x140 > > I tested against the HEAD b1ef997bec4d5cf251bfb5e47f7b04afa49bcdfe However, there is a bunch patches fixing sqpoll cancellations in 5.13, all are waiting for backporting. and for-next doesn't trigger the issue for me. Are you absolutely sure b1ef997bec4d5cf251bfb5e47f7b04afa49bcdfe does hit it? > commit on for-next tree > https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/?h=for-next > and the reproducer fails. -- Pavel Begunkov
