syzbot


kernel BUG at fs/ext4/inode.c:LINE!
Status: fixed on 2021/03/10 01:48
Reported-by: syzbot+3622cea378100f45d59f@syzkaller.appspotmail.com
Fix commit: 073861ed77b6 mm: fix VM_BUG_ON(PageTail) and BUG_ON(PageWriteback)
First crash: 392d, last: 263d

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 (7):
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 28d 340d 0/1 upstream: reported C repro on 2020/10/14 01:19
android-54 kernel BUG at fs/ext4/inode.c:LINE! C 43 4d23h 614d 0/1 upstream: reported C repro on 2020/01/14 12:13
android-49 kernel BUG at fs/ext4/inode.c:LINE! C 280 962d 892d 0/3 public: reported C repro on 2019/04/11 08:44
linux-4.14 kernel BUG at fs/ext4/inode.c:LINE! C 2 10d 268d 0/1 upstream: reported C repro on 2020/12/25 03:51
android-414 kernel BUG at fs/ext4/inode.c:LINE! 1 1037d 889d 0/1 auto-closed as invalid on 2019/05/15 13:37
android-44 kernel BUG at fs/ext4/inode.c:LINE! C 110 979d 892d 0/2 public: reported C repro on 2019/04/11 08:44
upstream kernel BUG in mpage_prepare_extent_to_map C done 4 8d23h 111d 0/22 upstream: reported C repro on 2021/05/31 07:15
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 Title
ci-upstream-kasan-gce-smack-root 2020/11/15 12:30 upstream e28c0d7c92c8 1da71ab0 .config log report syz C
ci-upstream-kasan-gce-smack-root 2020/10/16 11:59 upstream 9ff9b0d392ea 1da71ab0 .config log report syz C
Crashes (9):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2020/08/23 07:49 upstream c3d8f220d012 1da71ab0 .config log report syz C
ci-upstream-kasan-gce-selinux-root 2020/09/06 20:18 upstream dd9fb9bb3340 abf9ba4f .config log report syz
ci-upstream-kasan-gce-root 2020/12/30 04:26 upstream 139711f033f6 0fa352f2 .config log report info
ci-upstream-kasan-gce-smack-root 2020/09/07 02:20 upstream a8205e310011 abf9ba4f .config log report
ci-upstream-kasan-gce-root 2020/09/06 18:20 upstream dd9fb9bb3340 abf9ba4f .config log report
ci-upstream-kasan-gce-smack-root 2020/08/23 02:40 upstream c3d8f220d012 1da71ab0 .config log report
ci-qemu-upstream-386 2020/11/23 01:28 upstream d5530d82efc8 0d27f508 .config log report info
ci-upstream-net-this-kasan-gce 2020/12/24 23:57 net 1f45dc220667 c2c1d1dd .config log report info
ci-upstream-net-this-kasan-gce 2020/09/16 10:26 net 2e5117ba9f58 18d7d030 .config log report info