linux-kernel - Re: [syzbot] INFO: task hung in io_uring_cancel

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Message-ID: <f820728f-8dbd-9e36-1293-02514812eea0@kernel.dk>
Date:   Wed, 8 Dec 2021 20:45:27 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Josef Bacik <josef@...icpanda.com>,
        syzbot <syzbot+21e6887c0be14181206d@...kaller.appspotmail.com>
Cc:     asml.silence@...il.com, clm@...com, dsterba@...e.com,
        fgheet255t@...il.com, io-uring@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, wqu@...e.com
Subject: Re: [syzbot] INFO: task hung in io_uring_cancel_generic (2)

On 12/8/21 7:51 PM, Josef Bacik wrote:
> On Wed, Dec 08, 2021 at 02:12:09PM -0800, syzbot wrote:
>> syzbot has bisected this issue to:
>>
>> commit 741ec653ab58f5f263f2b6df38157997661c7a50
>> Author: Qu Wenruo <wqu@...e.com>
>> Date:   Mon Sep 27 07:22:01 2021 +0000
>>
>>     btrfs: subpage: make end_compressed_bio_writeback() compatible
>>
> 
> This isn't the right patch, this is x86 so sectorsize == pagesize, so this patch
> didn't change anything at all.  Also unless the local fs is btrfs with
> compression enabled I'm not entirely sure how this would even matter, the
> reproducer seems to be purely io_uring related.  Thanks,

Yeah, it's not btrfs, it's just one of those "bisect gone awry" cases. btrfs
guys can ignore this one.

-- 
Jens Axboe