======================================
| [ 15.407683][ C2] #4: ffff88800f9c3358 (&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
| [ 15.408184][ C2] #5: ffffffffa0b5b5c0 (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)
| [ 15.408539][ C2]
| [ 15.408539][ C2] stack backtrace:
[ 15.408788][ C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.408791][ C2] Workqueue: events_unbound linkwatch_event
[ 15.408796][ C2] Call Trace:
[ 15.408798][ C2]
[ 15.408801][ C2] dump_stack_lvl (lib/dump_stack.c:123)
[ 15.408808][ C2] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848)
[ 15.408819][ 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)
[ 15.408830][ C2] __dev_queue_xmit (net/core/dev.h:340 net/core/dev.c:4631)
[ 15.408841][ 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)
[ 15.408851][ C2] ? __pfx___dev_queue_xmit (net/core/dev.c:4538)
[ 15.408853][ C2] ? __pfx___alloc_skb (net/core/skbuff.c:642)
[ 15.408860][ C2] ? stack_trace_save (kernel/stacktrace.c:123)
[ 15.408866][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114)
[ 15.408873][ C2] ? __pfx___br_multicast_query_handle_vlan (net/bridge/br_multicast.c:909) bridge
[ 15.408926][ C2] br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge
[ 15.408959][ C2] ? __pfx_br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge
[ 15.408991][ 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
[ 15.409031][ C2] __br_multicast_send_query (net/bridge/br_multicast.c:1813) bridge
[ 15.409079][ C2] ? __pfx___br_multicast_send_query (net/bridge/br_multicast.c:1789) bridge
[ 15.409120][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5228)
[ 15.409131][ C2] ? br_multicast_send_query (net/bridge/br_multicast.c:1891) bridge
[ 15.409165][ C2] br_multicast_send_query (net/bridge/br_multicast.c:1891) bridge
[ 15.409203][ C2] ? __pfx_br_multicast_send_query (net/bridge/br_multicast.c:1852) bridge
[ 15.409236][ 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
[ 15.409273][ C2] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge
[ 15.409307][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816)
[ 15.409313][ 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)
[ 15.409318][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114)
[ 15.409322][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824)
[ 15.409325][ 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
[ 15.409364][ C2] ? br_multicast_port_query_expired (net/bridge/br_multicast.c:1917) bridge
[ 15.409396][ C2] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge
[ 15.409429][ C2] br_multicast_port_query_expired (net/bridge/br_multicast.c:1917) bridge
[ 15.409465][ C2] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge
[ 15.409499][ C2] call_timer_fn (kernel/time/timer.c:1789)
[ 15.409502][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779)
[ 15.409505][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779)
[ 15.409509][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1766)
[ 15.409513][ 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)
[ 15.409522][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4323)
[ 15.409534][ C2] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414)
[ 15.409538][ C2] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge
[ 15.409580][ C2] ? __pfx___run_timers (kernel/time/timer.c:2385)
[ 15.409589][ 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)
[ 15.409593][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114)
[ 15.409597][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824)
[ 15.409600][ C2] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445)
[ 15.409611][ C2] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445)
[ 15.409616][ C2] handle_softirqs (kernel/softirq.c:561)
[ 15.409625][ C2] ? br_device_event (net/bridge/br.c:97) bridge
[ 15.409656][ C2] do_softirq (kernel/softirq.c:462 kernel/softirq.c:449)
[ 15.409659][ C2]
[ 15.409660][ C2]
[ 15.409662][ C2] __local_bh_enable_ip (kernel/softirq.c:389)
[ 15.409667][ C2] br_device_event (net/bridge/br.c:97) bridge
[ 15.409697][ C2] ? __pfx_br_device_event (net/bridge/br.c:29) bridge
[ 15.409729][ C2] ? packet_notifier (net/packet/af_packet.c:4281)
[ 15.409739][ C2] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 15.409751][ C2] netdev_state_change (net/core/dev.c:1538 net/core/dev.c:1529)
[ 15.409755][ C2] ? __pfx_netdev_state_change (net/core/dev.c:1530)
[ 15.409771][ C2] linkwatch_do_dev (net/core/link_watch.c:186)
[ 15.409775][ C2] __linkwatch_run_queue (./include/linux/spinlock.h:376 net/core/link_watch.c:245)
[ 15.409782][ C2] ? __pfx___linkwatch_run_queue (net/core/link_watch.c:195)
[ 15.409789][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824)
[ 15.409799][ C2] linkwatch_event (net/core/link_watch.c:287)
[ 15.409801][ C2] process_one_work (kernel/workqueue.c:3238)
[ 15.409815][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503)
[ 15.409820][ C2] ? __pfx_process_one_work (kernel/workqueue.c:3140)
[ 15.409833][ C2] ? assign_work (kernel/workqueue.c:1200)
[ 15.409843][ C2] worker_thread (kernel/workqueue.c:3313 kernel/workqueue.c:3400)
[ 15.409857][ C2] ? __pfx_worker_thread (kernel/workqueue.c:3346)
[ 15.409863][ C2] kthread (kernel/kthread.c:464)
[ 15.409867][ C2] ? __pfx_kthread (kernel/kthread.c:413)
[ 15.409876][ C2] ? __pfx_kthread (kernel/kthread.c:413)
[ 15.409882][ C2] ret_from_fork (arch/x86/kernel/process.c:148)
[ 15.409886][ 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