syzbot


UBSAN: shift-out-of-bounds in ext4_mb_init
Status: upstream: reported C repro on 2021/02/01 09:16
Reported-by: syzbot+a8b4b0c60155e87e9484@syzkaller.appspotmail.com
First crash: 28d, last: 16d

Cause bisection: introduced by (bisect log) :
commit cfd73237722135807967f389bcbda558a60a30d6
Author: Alex Zhuravlev <bzzz@whamcloud.com>
Date: Tue Apr 21 07:54:07 2020 +0000

  ext4: add prefetching for block allocation bitmaps

Crash: UBSAN: shift-out-of-bounds in ext4_mb_init (log)
Repro: C syz .config
Patch testing requests:
Created Duration User Patch Repo Result
2021/02/03 13:11 18m snovitoll@gmail.com https://linux.googlesource.com/linux/kernel/git/torvalds/linux refs/changes/57/8057/1 OK

Sample crash report:

Crashes (5):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2021/01/31 19:42 upstream 6642d600 fc9fd31e .config log report syz C UBSAN: shift-out-of-bounds in ext4_mb_init
ci-upstream-kasan-gce-root 2021/02/12 05:05 upstream 291009f6 a5f86b15 .config log report info UBSAN: shift-out-of-bounds in ext4_mb_init
ci-upstream-kasan-gce-smack-root 2021/02/11 23:03 upstream 291009f6 a5f86b15 .config log report info UBSAN: shift-out-of-bounds in ext4_mb_init
ci-upstream-kasan-gce-smack-root 2021/01/31 19:20 upstream 6642d600 fc9fd31e .config log report info UBSAN: shift-out-of-bounds in ext4_mb_init
ci-upstream-linux-next-kasan-gce-root 2021/02/04 20:35 linux-next 0e2c50f4 42b90a7c .config log report info UBSAN: shift-out-of-bounds in ext4_mb_init