linux-kernel - Re: [syzbot] kernel BUG in vmf_insert_pfn

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Message-ID: <00000000000079478a05cc4a7730@google.com>
Date:   Sat, 18 Sep 2021 12:58:07 -0700
From:   syzbot <syzbot+2d4f8693f438d2bd4bdb@...kaller.appspotmail.com>
To:     airlied@...ux.ie, christian.koenig@....com, daniel.vetter@...ll.ch,
        daniel.vetter@...el.com, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org,
        linaro-mm-sig-owner@...ts.linaro.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, maarten.lankhorst@...ux.intel.com,
        mripard@...nel.org, sumit.semwal@...aro.org,
        syzkaller-bugs@...glegroups.com, tzimmermann@...e.de
Subject: Re: [syzbot] kernel BUG in vmf_insert_pfn_prot

syzbot has bisected this issue to:

commit 8b93d1d7dbd578fd296e70008b29c0f62d09d7cb
Author: Daniel Vetter <daniel.vetter@...ll.ch>
Date:   Thu Aug 12 13:14:10 2021 +0000

    drm/shmem-helper: Switch to vmf_insert_pfn

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1277054f300000
start commit:   9004fd387338 Add linux-next specific files for 20210917
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1177054f300000
console output: https://syzkaller.appspot.com/x/log.txt?x=1677054f300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=45d5ac72f31f29f3
dashboard link: https://syzkaller.appspot.com/bug?extid=2d4f8693f438d2bd4bdb
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13ad5527300000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13beef77300000

Reported-by: syzbot+2d4f8693f438d2bd4bdb@...kaller.appspotmail.com
Fixes: 8b93d1d7dbd5 ("drm/shmem-helper: Switch to vmf_insert_pfn")

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