syzbot


kernel BUG at fs/ext4/inode.c:LINE!
Status: upstream: reported C repro on 2020/08/27 02:48
Reported-by: syzbot+3622cea378100f45d59f@syzkaller.appspotmail.com
Fix commit: 073861ed mm: fix VM_BUG_ON(PageTail) and BUG_ON(PageWriteback)
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-upstream-bpf-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-upstream-bpf-next-kasan-gce ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386]
First crash: 101d, last: 10d

Cause bisection: introduced by (bisect log) [merge commit]:
commit e51418191f5a741b5f94764798c81bf69dec4806
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri Aug 7 17:53:02 2020 +0000

  Merge tag 'for-linus-5.9-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Crash: kernel BUG at fs/ext4/inode.c:LINE! (log)
Repro: C syz .config
similar bugs (5):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 kernel BUG at fs/ext4/inode.c:LINE! C 1 19d 50d 0/1 upstream: reported C repro on 2020/10/14 01:19
android-54 kernel BUG at fs/ext4/inode.c:LINE! 34 46d 323d 0/1 upstream: reported on 2020/01/14 12:13
android-49 kernel BUG at fs/ext4/inode.c:LINE! C 280 672d 601d 0/3 public: reported C repro on 2019/04/11 08:44
android-414 kernel BUG at fs/ext4/inode.c:LINE! 1 747d 599d 0/1 auto-closed as invalid on 2019/05/15 13:37
android-44 kernel BUG at fs/ext4/inode.c:LINE! C 110 689d 601d 0/2 public: reported C repro on 2019/04/11 08:44
Patch testing requests:
Created Duration User Patch Repo Result
2020/09/02 05:13 16m anant.thazhemadam@gmail.com https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master report log
2020/08/27 14:33 16m foxhlchen@gmail.com https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master report log

Sample crash report:

Fix bisection attempts:
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info
ci-upstream-kasan-gce-smack-root 2020/11/15 12:30 upstream e28c0d7c 1da71ab0 .config log report syz C
ci-upstream-kasan-gce-smack-root 2020/10/16 11:59 upstream 9ff9b0d3 1da71ab0 .config log report syz C
Crashes (7):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Maintainers
ci-upstream-kasan-gce-smack-root 2020/08/23 07:49 upstream c3d8f220 1da71ab0 .config log report syz C adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu
ci-upstream-kasan-gce-selinux-root 2020/09/06 20:18 upstream dd9fb9bb abf9ba4f .config log report syz adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu
ci-upstream-kasan-gce-smack-root 2020/09/07 02:20 upstream a8205e31 abf9ba4f .config log report adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu
ci-upstream-kasan-gce-root 2020/09/06 18:20 upstream dd9fb9bb abf9ba4f .config log report adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu
ci-upstream-kasan-gce-smack-root 2020/08/23 02:40 upstream c3d8f220 1da71ab0 .config log report adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu
ci-qemu-upstream-386 2020/11/23 01:28 upstream d5530d82 0d27f508 .config log report info adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu
ci-upstream-net-this-kasan-gce 2020/09/16 10:26 net 2e5117ba 18d7d030 .config log report info adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu