syzbot


possible deadlock in dev_uc_sync
Status: upstream: reported C repro on 2020/07/06 15:42
Reported-by: syzbot+4a0f7bc34e3997a6c7df@syzkaller.appspotmail.com
Fix commit: net: core: use list_del_init() instead of list_del() in netdev_run_todo()
Patched on: [ci-upstream-bpf-kasan-gce ci-upstream-net-this-kasan-gce], missing on: [ci-qemu-upstream ci-qemu-upstream-386 ci-upstream-bpf-next-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 ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 107d, last: 8d12h

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: general protection fault in batadv_iv_ogm_queue_add (log)
Repro: C syz .config
similar bugs (2):
Kernel Title Repro Bisected Count Last Reported Patched Status
linux-4.19 possible deadlock in dev_uc_sync 1 77d 77d 0/1 upstream: reported on 2020/08/04 10:24
linux-4.14 possible deadlock in dev_uc_sync 1 59d 59d 0/1 upstream: reported on 2020/08/21 23:00

Sample crash report:

Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Maintainers
ci-upstream-kasan-gce 2020/10/12 07:02 upstream 3dd0130f 4a77ae0b .config log report syz C ap420073@gmail.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, xiyou.wangcong@gmail.com
ci-upstream-kasan-gce 2020/10/12 03:51 upstream 3dd0130f 4a77ae0b .config log report info ap420073@gmail.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, xiyou.wangcong@gmail.com
ci-upstream-net-kasan-gce 2020/07/05 11:17 net-next e44f65fd 51095195 .config log report ap420073@gmail.com, davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, xiyou.wangcong@gmail.com