linux-kernel - Re: [syzbot] KASAN: use-after-free Read in copy_page_from_iter

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Date:   Fri, 10 Jun 2022 00:10:19 -0700
From:   syzbot <syzbot+d2dd123304b4ae59f1bd@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, clm@...com, dsterba@...e.com,
        hch@....de, josef@...icpanda.com, linux-btrfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com,
        willy@...radead.org
Subject: Re: [syzbot] KASAN: use-after-free Read in copy_page_from_iter_atomic (2)

syzbot has bisected this issue to:

commit 4cd4aed63125ccd4efc35162627827491c2a7be7
Author: Christoph Hellwig <hch@....de>
Date:   Fri May 27 08:43:20 2022 +0000

    btrfs: fold repair_io_failure into btrfs_repair_eb_io_failure

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1332525ff00000
start commit:   ff539ac73ea5 Add linux-next specific files for 20220609
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10b2525ff00000
console output: https://syzkaller.appspot.com/x/log.txt?x=1732525ff00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a5002042f00a8bce
dashboard link: https://syzkaller.appspot.com/bug?extid=d2dd123304b4ae59f1bd
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10d6d7cff00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1113b2bff00000

Reported-by: syzbot+d2dd123304b4ae59f1bd@...kaller.appspotmail.com
Fixes: 4cd4aed63125 ("btrfs: fold repair_io_failure into btrfs_repair_eb_io_failure")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection