linux-kernel - Re: KASAN: slab-out-of-bounds Read in btrfs_scan_one

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Message-ID: <000000000000e0aa9a05b5dc86cb@google.com>
Date:   Mon, 07 Dec 2020 01:34:03 -0800
From:   syzbot <syzbot+c4b1e5278d93269fd69c@...kaller.appspotmail.com>
To:     anand.jain@...cle.com, clm@...com, dsterba@...e.com,
        johannes.thumshirn@....com, josef@...icpanda.com,
        jthumshirn@...e.de, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org, nborisov@...e.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: slab-out-of-bounds Read in btrfs_scan_one_device

syzbot suspects this issue was fixed by commit:

commit 0697d9a610998b8bdee6b2390836cb2391d8fd1a
Author: Johannes Thumshirn <johannes.thumshirn@....com>
Date:   Wed Nov 18 09:03:26 2020 +0000

    btrfs: don't access possibly stale fs_info data for printing duplicate device

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10fb0d9b500000
start commit:   521b619a Merge tag 'linux-kselftest-kunit-fixes-5.10-rc3' ..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=e791ddf0875adf65
dashboard link: https://syzkaller.appspot.com/bug?extid=c4b1e5278d93269fd69c
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16296f5c500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1614e746500000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: btrfs: don't access possibly stale fs_info data for printing duplicate device

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