[FS#3265] AP crashed when enabling multicast_snooping

[OpenWrt Bugs]

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FS#3265 - AP crashed when enabling multicast_snooping
User who did this - Erik Larsson (whooo)

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Forgot to add some output from the kernel log:
[ 2346.354659] rcu: INFO: rcu_sched self-detected stall on CPU
[ 2346.355038] rcu: #0112-....: (2105 ticks this GP) idle=45a/1/0x40000002 softirq=6045/6046 fqs=1049
[ 2346.359303] #011(t=2100 jiffies g=34437 q=3)
[ 2346.368277] NMI backtrace for cpu 2
[ 2346.372231] CPU: 2 PID: 1338 Comm: ash Not tainted 5.4.52 #0
[ 2346.375480] Hardware name: Generic DT based system
[ 2346.381571] [] (unwind_backtrace) from [] (show_stack+0x10/0x14)
[ 2346.386116] [] (show_stack) from [] (dump_stack+0x94/0xa8)
[ 2346.394032] [] (dump_stack) from [] (nmi_cpu_backtrace+0x90/0xc4)
[ 2346.401084] [] (nmi_cpu_backtrace) from [] (nmi_trigger_cpumask_backtrace+0x124/0x138)
[ 2346.409004] [] (nmi_trigger_cpumask_backtrace) from [] (rcu_dump_cpu_stacks+0xa4/0xcc)
[ 2346.418549] [] (rcu_dump_cpu_stacks) from [] (rcu_sched_clock_irq+0x62c/0x808)
[ 2346.428178] [] (rcu_sched_clock_irq) from [] (update_process_times+0x30/0x60)
[ 2346.437125] [] (update_process_times) from [] (tick_sched_timer+0x4c/0xa8)
[ 2346.446059] [] (tick_sched_timer) from [] (__hrtimer_run_queues+0x154/0x200)
[ 2346.454552] [] (__hrtimer_run_queues) from [] (hrtimer_interrupt+0x118/0x2a0)
[ 2346.463494] [] (hrtimer_interrupt) from [] (arch_timer_handler_virt+0x28/0x30)
[ 2346.472277] [] (arch_timer_handler_virt) from [] (handle_percpu_devid_irq+0x78/0x138)
[ 2346.481121] [] (handle_percpu_devid_irq) from [] (generic_handle_irq+0x24/0x34)
[ 2346.490726] [] (generic_handle_irq) from [] (__handle_domain_irq+0x5c/0xb4)
[ 2346.499617] [] (__handle_domain_irq) from [] (gic_handle_irq+0x4c/0x90)
[ 2346.508290] [] (gic_handle_irq) from [] (__irq_svc+0x6c/0x90)
[ 2346.516490] Exception stack(0xcbe35ae0 to 0xcbe35b28)
[ 2346.524221] 5ae0: cf200e34 00000000 0000000d 0000000c ce30d780 c0c04e48 00000000 cf200e34
[ 2346.529280] 5b00: cf200cc0 ce065e08 cbe35b90 c0c05f3c c0c03d00 cbe35b30 c085f7dc c088b59c
[ 2346.537345] 5b20: 80000013 ffffffff
[ 2346.545603] [] (__irq_svc) from [] (_raw_spin_lock+0x2c/0x40)
[ 2346.548933] [] (_raw_spin_lock) from [] (br_multicast_add_group+0x34/0x17c)
[ 2346.556576] [] (br_multicast_add_group) from [] (br_multicast_rcv+0xad8/0xedc)
[ 2346.565068] [] (br_multicast_rcv) from [] (br_dev_xmit+0x170/0x3c0)
[ 2346.574096] [] (br_dev_xmit) from [] (dev_hard_start_xmit+0x8c/0x11c)
[ 2346.582009] [] (dev_hard_start_xmit) from [] (__dev_queue_xmit+0x718/0x880)
[ 2346.590342] [] (__dev_queue_xmit) from [] (ip6_finish_output2+0x1a4/0x460)
[ 2346.598837] [] (ip6_finish_output2) from [] (ip6_output+0x5c/0xd0)
[ 2346.607513] [] (ip6_output) from [] (igmp6_send+0x29c/0x2a4)
[ 2346.615407] [] (igmp6_send) from [] (igmp6_join_group.part.7+0x20/0xd4)
[ 2346.622955] [] (igmp6_join_group.part.7) from [] (igmp6_group_added+0xf0/0xf8)
[ 2346.631042] [] (igmp6_group_added) from [] (__ipv6_dev_mc_inc+0x200/0x2c8)
[ 2346.640081] [] (__ipv6_dev_mc_inc) from [] (br_multicast_open+0xcc/0x110)
[ 2346.648675] [] (br_multicast_open) from [] (br_multicast_toggle+0x74/0xac)
[ 2346.657250] [] (br_multicast_toggle) from [] (store_bridge_parm+0x70/0xd4)
[ 2346.665778] [] (store_bridge_parm) from [] (kernfs_fop_write+0x108/0x220)
[ 2346.674357] [] (kernfs_fop_write) from [] (__vfs_write+0x1c/0x1a4)
[ 2346.682908] [] (__vfs_write) from [] (vfs_write+0xa4/0x188)
[ 2346.690714] [] (vfs_write) from [] (ksys_write+0x48/0xb4)
[ 2346.697920] [] (ksys_write) from [] (ret_fast_syscall+0x0/0x54)
[ 2346.705117] Exception stack(0xcbe35fa8 to 0xcbe35ff0)
[ 2346.712638] 5fa0:                   00000000 00000000 00000001 b6f243e0 00000002 00000000
[ 2346.717897] 5fc0: 00000000 00000000 00000000 00000004 00000002 00000020 00084bfc 00084bfc
[ 2346.726004] 5fe0: bec13928 bec13918 b6ef8020 b6ef74f0

This output is forwarded to a syslog server as I don't have serial access, so might not be 100% complete.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3265#comment8613

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