linux-kernel - Re: INFO: task hung in io_uring_cancel

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Message-ID: <000000000000ad7f5805c134dc31@google.com>
Date:   Fri, 30 Apr 2021 11:34:28 -0700
From:   syzbot <syzbot+11bf59db879676f59e52@...kaller.appspotmail.com>
To:     Pavel Begunkov <asml.silence@...il.com>
Cc:     asml.silence@...il.com, axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, oswalpalash@...il.com,
        syzkaller-upstream-moderation@...glegroups.com
Subject: Re: INFO: task hung in io_uring_cancel_sqpoll

> On 4/30/21 4:02 PM, Palash Oswal wrote:
>> On Fri, Apr 30, 2021 at 8:03 PM Pavel Begunkov <asml.silence@...il.com> 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...@...il.com ax...@...nel.dk io-u...@...r.kernel.org linux-...@...r.kernel.org]
>>>>>
>>>>> 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.
>> 
>> I tested against the HEAD b1ef997bec4d5cf251bfb5e47f7b04afa49bcdfe
>> 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.
>
> Can't reproduce. Does it hang as in the original's report dmesg?
> Can you paste logs?
>
> #syz test: git://git.kernel.dk/linux-block io_uring-5.13

This crash does not have a reproducer. I cannot test it.

>
> -- 
> Pavel Begunkov