======================================
| [ 13.912766][ C2] #4: ffff88800be2b358 (&br->multicast_lock){+.-.}-{3:3}, at: br_multicast_port_query_expired (./include/trace/events/../../../net/bridge/br_private.h:1293 ./include/trace/events/../../../net/bridge/br_private.h:1302 net/bridge/br_multicast.c:1906) bridge
| [ 13.913263][ C2] #5: ffffffff9a55b5c0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:901 net/core/dev.c:4555)
| [ 13.913618][ C2]
| [ 13.913618][ C2] stack backtrace:
[ 13.913878][ C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 13.913880][ C2] Workqueue: events_unbound linkwatch_event
[ 13.913885][ C2] Call Trace:
[ 13.913888][ C2]
[ 13.913891][ C2] dump_stack_lvl (lib/dump_stack.c:123)
[ 13.913900][ C2] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848)
[ 13.913912][ C2] dev_hard_start_xmit (./include/net/net_namespace.h:418 ./include/linux/netdevice.h:2695 net/core/dev.c:2466 net/core/dev.c:3772 net/core/dev.c:3793)
[ 13.913923][ C2] __dev_queue_xmit (net/core/dev.h:340 net/core/dev.c:4631)
[ 13.913934][ C2] ? __build_skb_around (./arch/x86/include/asm/atomic.h:28 ./include/linux/atomic/atomic-arch-fallback.h:503 ./include/linux/atomic/atomic-instrumented.h:68 net/core/skbuff.c:381 net/core/skbuff.c:439)
[ 13.913946][ C2] ? __pfx___dev_queue_xmit (net/core/dev.c:4538)
[ 13.913949][ C2] ? __pfx___alloc_skb (net/core/skbuff.c:642)
[ 13.913956][ C2] ? stack_trace_save (kernel/stacktrace.c:123)
[ 13.913962][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114)
[ 13.913969][ C2] ? __pfx___br_multicast_query_handle_vlan (net/bridge/br_multicast.c:909) bridge
[ 13.914021][ C2] br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge
[ 13.914055][ C2] ? __pfx_br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge
[ 13.914088][ C2] ? br_multicast_count (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/trace/events/../../../net/bridge/br_private.h:764 net/bridge/br_multicast.c:5052) bridge
[ 13.914128][ C2] __br_multicast_send_query (net/bridge/br_multicast.c:1813) bridge
[ 13.914173][ C2] ? __pfx___br_multicast_send_query (net/bridge/br_multicast.c:1789) bridge
[ 13.914216][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5228)
[ 13.914226][ C2] ? br_multicast_send_query (net/bridge/br_multicast.c:1891) bridge
[ 13.914261][ C2] br_multicast_send_query (net/bridge/br_multicast.c:1891) bridge
[ 13.914300][ C2] ? __pfx_br_multicast_send_query (net/bridge/br_multicast.c:1852) bridge
[ 13.914334][ C2] ? br_multicast_port_query_expired (./include/trace/events/../../../net/bridge/br_private.h:1293 ./include/trace/events/../../../net/bridge/br_private.h:1302 net/bridge/br_multicast.c:1906) bridge
[ 13.914372][ C2] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge
[ 13.914407][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816)
[ 13.914413][ C2] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116)
[ 13.914418][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114)
[ 13.914422][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824)
[ 13.914425][ C2] ? br_multicast_port_query_expired (./include/trace/events/../../../net/bridge/br_private.h:1293 ./include/trace/events/../../../net/bridge/br_private.h:1302 net/bridge/br_multicast.c:1906) bridge
[ 13.914466][ C2] ? br_multicast_port_query_expired (net/bridge/br_multicast.c:1917) bridge
[ 13.914499][ C2] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge
[ 13.914533][ C2] br_multicast_port_query_expired (net/bridge/br_multicast.c:1917) bridge
[ 13.914570][ C2] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge
[ 13.914605][ C2] call_timer_fn (kernel/time/timer.c:1789)
[ 13.914608][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779)
[ 13.914611][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779)
[ 13.914615][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1766)
[ 13.914619][ C2] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:230)
[ 13.914628][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4323)
[ 13.914641][ C2] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414)
[ 13.914645][ C2] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge
[ 13.914688][ C2] ? __pfx___run_timers (kernel/time/timer.c:2385)
[ 13.914697][ C2] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116)
[ 13.914702][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114)
[ 13.914706][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824)
[ 13.914709][ C2] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445)
[ 13.914720][ C2] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445)
[ 13.914725][ C2] handle_softirqs (kernel/softirq.c:561)
[ 13.914735][ C2] ? br_device_event (net/bridge/br.c:97) bridge
[ 13.914766][ C2] do_softirq (kernel/softirq.c:462 kernel/softirq.c:449)
[ 13.914770][ C2]
[ 13.914771][ C2]
[ 13.914774][ C2] __local_bh_enable_ip (kernel/softirq.c:389)
[ 13.914778][ C2] br_device_event (net/bridge/br.c:97) bridge
[ 13.914809][ C2] ? __pfx_br_device_event (net/bridge/br.c:29) bridge
[ 13.914841][ C2] ? packet_notifier (net/packet/af_packet.c:4281)
[ 13.914852][ C2] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 13.914865][ C2] netdev_state_change (net/core/dev.c:1538 net/core/dev.c:1529)
[ 13.914869][ C2] ? __pfx_netdev_state_change (net/core/dev.c:1530)
[ 13.914884][ C2] linkwatch_do_dev (net/core/link_watch.c:186)
[ 13.914889][ C2] __linkwatch_run_queue (./include/linux/spinlock.h:376 net/core/link_watch.c:245)
[ 13.914896][ C2] ? __pfx___linkwatch_run_queue (net/core/link_watch.c:195)
[ 13.914903][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824)
[ 13.914913][ C2] linkwatch_event (net/core/link_watch.c:287)
[ 13.914916][ C2] process_one_work (kernel/workqueue.c:3238)
[ 13.914929][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503)
[ 13.914935][ C2] ? __pfx_process_one_work (kernel/workqueue.c:3140)
[ 13.914948][ C2] ? assign_work (kernel/workqueue.c:1200)
[ 13.914958][ C2] worker_thread (kernel/workqueue.c:3313 kernel/workqueue.c:3400)
[ 13.914973][ C2] ? __pfx_worker_thread (kernel/workqueue.c:3346)
[ 13.914979][ C2] kthread (kernel/kthread.c:464)
[ 13.914984][ C2] ? __pfx_kthread (kernel/kthread.c:413)
[ 13.914993][ C2] ? __pfx_kthread (kernel/kthread.c:413)
[ 13.914999][ C2] ret_from_fork (arch/x86/kernel/process.c:148)
[ 13.915004][ C2] ? __pfx_kthread (kernel/kthread.c:413)
Finger prints:
lockdep_rcu_suspicious:dev_hard_start_xmit:__dev_queue_xmit:br_dev_queue_push_xmit:__br_multicast_send_query