syzbot


KASAN: use-after-free Read in nbd_release
Status: upstream: reported C repro on 2021/02/22 09:05
Reported-by: syzbot+74f888d2e102b3930324@syzkaller.appspotmail.com
First crash: 7d08h, last: 4d21h

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: KASAN: use-after-free Write in ex_handler_refcount (log)
Repro: C syz .config
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 KASAN: use-after-free Read in nbd_release 1 8d11h 8d11h 0/1 upstream: reported on 2021/02/20 11:32
linux-4.19 KASAN: use-after-free Read in nbd_release 2 7d09h 7d17h 0/1 upstream: reported on 2021/02/21 06:21

Sample crash report:

Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-net-this-kasan-gce 2021/02/21 15:06 net 3af409ca 3e5ed8b4 .config log report syz C KASAN: use-after-free Read in nbd_release
ci-upstream-net-kasan-gce 2021/02/24 01:32 net-next d310ec03 fcc6d71b .config log report info KASAN: use-after-free Read in nbd_release
ci-upstream-net-kasan-gce 2021/02/22 06:43 net-next d310ec03 a659b3f1 .config log report info KASAN: use-after-free Read in nbd_release