general protection fault in snd_ctl_release
Status: upstream: reported syz repro on 2020/09/02 06:57
Fix commit: 77f4689d fix regression in "epoll: Keep a reference on files added to the check list"
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-upstream-bpf-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-upstream-bpf-next-kasan-gce]
First crash: 21d, last: 19d

Cause bisection: introduced by (bisect log):

commit a9ed4a6560b8562b7e2e2bed9527e88001f7b682
Author: Marc Zyngier <>
Date: Wed Aug 19 16:12:17 2020 +0000

  epoll: Keep a reference on files added to the check list

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

Sample crash report:

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Maintainers
ci-upstream-kasan-gce-root 2020/09/02 21:19 upstream 9c7d619b abf9ba4f .config log report syz,,,,,
ci-upstream-kasan-gce-smack-root 2020/09/01 19:51 upstream b51594df d5a3ae1f .config log report syz,,,,,
ci-upstream-kasan-gce 2020/09/01 14:38 upstream b51594df d5a3ae1f .config log report syz,,,,,
ci-upstream-kasan-gce-386 2020/08/31 15:22 upstream dcc5c6f0 d5a3ae1f .config log report syz,,,,,