syzbot


INFO: rcu detected stall in br_multicast_query_expired
Status: internal: reported C repro on 2021/12/21 09:55
Reported-by: syzbot+@syzkaller.appspotmail.com
Fix commit: f83a112bd91a net: bridge: mcast: add and enforce startup query interval minimum
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-bpf-kasan-gce 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-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-qemu2-riscv64 ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386]
First crash: 34d, last: 34d

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: INFO: rcu detected stall in lock_is_held_type (log)
Repro: C syz .config

Sample crash report:

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce 2021/12/21 09:54 upstream 86085fe79e3c 62bd192b .config log report syz C INFO: rcu detected stall in br_multicast_query_expired
ci-upstream-net-this-kasan-gce 2021/12/21 10:03 net 75a2f3152009 62bd192b .config log report syz C INFO: rcu detected stall in br_multicast_query_expired