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Subject: Re: INFO: task hung in io_uring_cancel_sqpoll
From:   Pavel Begunkov <asml.silence@gmail.com>
To:     Palash Oswal <oswalpalash@gmail.com>
Cc:     Jens Axboe <axboe@kernel.dk>, io-uring@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        syzbot+11bf59db879676f59e52@syzkaller.appspotmail.com
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Message-ID: <9a7c2040-e26f-1c59-b7e9-25784d5b854e@gmail.com>
Date:   Fri, 30 Apr 2021 22:04:58 +0100
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On 4/30/21 7:34 PM, Pavel Begunkov wrote:
> On 4/30/21 4:02 PM, Palash Oswal wrote:
>> On Fri, Apr 30, 2021 at 8:03 PM Pavel Begunkov <asml.silence@gmail.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...@gmail.com ax...@kernel.dk io-u...@vger.kernel.org linux-...@vger.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?

and `uname -r` if you could

> 
> #syz test: git://git.kernel.dk/linux-block io_uring-5.13
> 

-- 
Pavel Begunkov