syzbot


UBSAN: shift-out-of-bounds in gred_change
Status: fixed on 2021/03/10 01:48
Reported-by: syzbot+1819b70451246ed8cf57@syzkaller.appspotmail.com
Fix commit: bd1248f1ddbc net: sched: prevent invalid Scell_log shift count
First crash: 345d, last: 287d

Cause bisection: introduced by (bisect log) [release commit]:
commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sun Sep 15 21:19:32 2019 +0000

  Linux 5.3

Crash: UBSAN: undefined-behaviour in gred_change (log)
Repro: C syz .config

Sample crash report:

Crashes (5):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-net-kasan-gce 2020/12/27 21:37 net-next 3db1a3fa9880 2242f77f .config log report syz C
ci-upstream-net-kasan-gce 2021/02/24 11:04 net-next d310ec03a34e fcc6d71b .config log report info UBSAN: shift-out-of-bounds in gred_change
ci-upstream-net-kasan-gce 2021/01/18 03:54 net-next 213b97b12580 fd103621 .config log report info UBSAN: shift-out-of-bounds in gred_change
ci-upstream-net-kasan-gce 2021/01/02 20:40 net-next 3db1a3fa9880 79264ae3 .config log report info
ci-upstream-net-kasan-gce 2020/12/27 21:05 net-next 3db1a3fa9880 2242f77f .config log report info