======================================
| [ 203.076588][ C2] #4: ffff88800ece3358 (&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
| [ 203.077432][ C2] #5: ffffffff99b5b5c0 (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)
| [ 203.078364][ C2]
| [ 203.078364][ C2] stack backtrace:
[ 203.078786][ C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 203.078789][ C2] Workqueue: events_unbound linkwatch_event
[ 203.078798][ C2] Call Trace:
[ 203.078801][ C2]
[ 203.078806][ C2] dump_stack_lvl (lib/dump_stack.c:123)
[ 203.078818][ C2] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848)
[ 203.078835][ 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)
[ 203.078857][ C2] __dev_queue_xmit (net/core/dev.h:340 net/core/dev.c:4631)
[ 203.078877][ 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)
[ 203.078893][ C2] ? __pfx___dev_queue_xmit (net/core/dev.c:4538)
[ 203.078897][ C2] ? __pfx___alloc_skb (net/core/skbuff.c:642)
[ 203.078902][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503)
[ 203.078919][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114)
[ 203.078932][ C2] ? __pfx___br_multicast_query_handle_vlan (net/bridge/br_multicast.c:909) bridge
[ 203.079026][ C2] br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge
[ 203.079083][ C2] ? hlock_class (kernel/locking/lockdep.c:225)
[ 203.079091][ C2] ? __pfx_br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge
[ 203.079152][ 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
[ 203.079225][ C2] __br_multicast_send_query (net/bridge/br_multicast.c:1813) bridge
[ 203.079305][ C2] ? __pfx___br_multicast_send_query (net/bridge/br_multicast.c:1789) bridge
[ 203.079375][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5228)
[ 203.079395][ C2] ? br_multicast_send_query (net/bridge/br_multicast.c:1891) bridge
[ 203.079451][ C2] br_multicast_send_query (net/bridge/br_multicast.c:1891) bridge
[ 203.079521][ C2] ? __pfx_br_multicast_send_query (net/bridge/br_multicast.c:1852) bridge
[ 203.079579][ 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
[ 203.079647][ C2] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge
[ 203.079710][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816)
[ 203.079723][ 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)
[ 203.079730][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114)
[ 203.079736][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824)
[ 203.079741][ 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
[ 203.079813][ C2] ? br_multicast_port_query_expired (net/bridge/br_multicast.c:1917) bridge
[ 203.079873][ C2] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge
[ 203.079932][ C2] br_multicast_port_query_expired (net/bridge/br_multicast.c:1917) bridge
[ 203.079999][ C2] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge
[ 203.080058][ C2] call_timer_fn (kernel/time/timer.c:1789)
[ 203.080066][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779)
[ 203.080071][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779)
[ 203.080079][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1766)
[ 203.080086][ 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)
[ 203.080104][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4323)
[ 203.080126][ C2] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414)
[ 203.080133][ C2] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge
[ 203.080211][ C2] ? __pfx___run_timers (kernel/time/timer.c:2385)
[ 203.080229][ 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)
[ 203.080239][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114)
[ 203.080246][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824)
[ 203.080252][ C2] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445)
[ 203.080272][ C2] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445)
[ 203.080280][ C2] handle_softirqs (kernel/softirq.c:561)
[ 203.080298][ C2] ? ip6_route_add (./include/net/ip6_fib.h:341 net/ipv6/route.c:3872)
[ 203.080313][ C2] do_softirq (kernel/softirq.c:462 kernel/softirq.c:449)
[ 203.080320][ C2]
[ 203.080322][ C2]
[ 203.080325][ C2] __local_bh_enable_ip (kernel/softirq.c:389)
[ 203.080333][ C2] ip6_route_add (./include/net/ip6_fib.h:341 net/ipv6/route.c:3872)
[ 203.080346][ C2] addrconf_prefix_route (net/ipv6/addrconf.c:2461)
[ 203.080361][ C2] ? __pfx_addrconf_prefix_route (net/ipv6/addrconf.c:2461)
[ 203.080366][ C2] ? atomic_notifier_call_chain (kernel/notifier.c:227)
[ 203.080422][ C2] ? ip6_route_add (net/ipv6/route.c:3875)
[ 203.080444][ C2] addrconf_add_linklocal (./include/linux/spinlock.h:356 net/ipv6/addrconf.c:4164 net/ipv6/addrconf.c:3309)
[ 203.080456][ C2] ? __pfx_addrconf_add_linklocal (net/ipv6/addrconf.c:3286)
[ 203.080494][ C2] addrconf_addr_gen (net/ipv6/addrconf.c:3436)
[ 203.080502][ C2] ? __pfx_addrconf_addr_gen (net/ipv6/addrconf.c:3405)
[ 203.080531][ C2] ? addrconf_notify (./include/linux/err.h:81 net/ipv6/addrconf.c:3741)
[ 203.080536][ C2] addrconf_notify (./include/linux/err.h:81 net/ipv6/addrconf.c:3741)
[ 203.080552][ C2] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 203.080575][ C2] netdev_state_change (net/core/dev.c:1538 net/core/dev.c:1529)
[ 203.080582][ C2] ? __pfx_netdev_state_change (net/core/dev.c:1530)
[ 203.080614][ C2] linkwatch_do_dev (net/core/link_watch.c:186)
[ 203.080622][ C2] __linkwatch_run_queue (./include/linux/spinlock.h:376 net/core/link_watch.c:245)
[ 203.080637][ C2] ? __pfx___linkwatch_run_queue (net/core/link_watch.c:195)
[ 203.080649][ C2] ? lock_acquire (kernel/locking/lockdep.c:5824)
[ 203.080669][ C2] linkwatch_event (net/core/link_watch.c:287)
[ 203.080673][ C2] process_one_work (kernel/workqueue.c:3238)
[ 203.080702][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5503)
[ 203.080711][ C2] ? __pfx_process_one_work (kernel/workqueue.c:3140)
[ 203.080737][ C2] ? assign_work (kernel/workqueue.c:1200)
[ 203.080757][ C2] worker_thread (kernel/workqueue.c:3313 kernel/workqueue.c:3400)
[ 203.080783][ C2] ? __pfx_worker_thread (kernel/workqueue.c:3346)
[ 203.080795][ C2] kthread (kernel/kthread.c:464)
[ 203.080804][ C2] ? __pfx_kthread (kernel/kthread.c:413)
[ 203.080822][ C2] ? __pfx_kthread (kernel/kthread.c:413)
[ 203.080833][ C2] ret_from_fork (arch/x86/kernel/process.c:148)
[ 203.080840][ 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