linux-kernel - Re: BUG: unable to handle kernel NULL pointer dereference in generic_perform

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Date:   Wed, 10 Jun 2020 17:25:02 -0700
From:   syzbot <syzbot+bca9799bf129256190da@...kaller.appspotmail.com>
To:     adilger.kernel@...ger.ca, akpm@...ux-foundation.org,
        dan.j.williams@...el.com, jack@...e.cz, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: Re: BUG: unable to handle kernel NULL pointer dereference in
 generic_perform_write (2)

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger crash:

Reported-and-tested-by: syzbot+bca9799bf129256190da@...kaller.appspotmail.com

Tested on:

commit:         5749fe5a ext4: avoid race conditions when remounting with ..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
kernel config:  https://syzkaller.appspot.com/x/.config?x=175fcaead7a60c3f
dashboard link: https://syzkaller.appspot.com/bug?extid=bca9799bf129256190da
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Note: testing is done by a robot and is best-effort only.