syzbot


KASAN: null-ptr-deref Read in percpu_ref_exit
Status: upstream: reported C repro on 2020/09/04 05:48
Reported-by: syzbot+4264ecfcf0f27a5e4180@syzkaller.appspotmail.com
First crash: 25d, last: 20d

Cause bisection: introduced by (bisect log):

commit d0c567d60f3730b97050347ea806e1ee06445c78
Author: Ming Lei <ming.lei@redhat.com>
Date: Wed Sep 2 12:26:42 2020 +0000

  percpu_ref: reduce memory footprint of percpu_ref in fast path

Crash: BUG: unable to handle kernel NULL pointer dereference in percpu_ref_exit (log)
Repro: C syz .config

Sample crash report:

Crashes (11):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Maintainers
ci-upstream-linux-next-kasan-gce-root 2020/09/03 20:14 linux-next 7a695657 abf9ba4f .config log report syz C axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root 2020/09/08 12:14 linux-next 7a695657 abf9ba4f .config log report axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root 2020/09/08 01:36 linux-next 7a695657 abf9ba4f .config log report axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root 2020/09/07 02:43 linux-next 7a695657 abf9ba4f .config log report axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root 2020/09/06 23:04 linux-next 7a695657 abf9ba4f .config log report axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root 2020/09/06 21:08 linux-next 7a695657 abf9ba4f .config log report axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root 2020/09/06 21:00 linux-next 7a695657 abf9ba4f .config log report axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root 2020/09/06 20:14 linux-next 7a695657 abf9ba4f .config log report axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root 2020/09/06 03:22 linux-next 7a695657 abf9ba4f .config log report axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root 2020/09/05 22:29 linux-next 7a695657 abf9ba4f .config log report axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root 2020/09/03 20:01 linux-next 7a695657 abf9ba4f .config log report axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org