rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P3159/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=17361, q=2943 ncpus=2)
task:kworker/R-mld   state:R  running task     stack:25776 pid:3159  tgid:3159  ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: mld mld_dad_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0x190e/0x4c90 kernel/sched/core.c:6764
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7086
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:103 [inline]
RIP: 0010:__local_bh_enable_ip+0x170/0x200 kernel/softirq.c:396
Code: 8c e8 44 21 74 0a 65 66 8b 05 14 20 82 7e 66 85 c0 75 5d bf 01 00 00 00 e8 cd d6 0b 00 e8 08 6c 45 00 fb 65 8b 05 d8 1f 82 7e <85> c0 75 05 e8 57 81 a8 ff 48 c7 44 24 20 0e 36 e0 45 49 c7 04 1c
RSP: 0018:ffffc9000bee7700 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 1ffff920017dcee4 RCX: ffffffff819b316a
RDX: dffffc0000000000 RSI: ffffffff8c0aa680 RDI: ffffffff8c608a00
RBP: ffffc9000bee77a8 R08: ffffffff942f98df R09: 1ffffffff285f31b
R10: dffffc0000000000 R11: fffffbfff285f31c R12: dffffc0000000000
R13: 1ffff920017dcee8 R14: ffffc9000bee7740 R15: 0000000000000201
 ipv6_get_lladdr+0x295/0x3d0 net/ipv6/addrconf.c:1935
 mld_newpack+0x337/0xaf0 net/ipv6/mcast.c:1798
 add_grhead net/ipv6/mcast.c:1893 [inline]
 add_grec+0x1492/0x19a0 net/ipv6/mcast.c:2031
 mld_send_initial_cr+0x228/0x4b0 net/ipv6/mcast.c:2277
 mld_dad_work+0x44/0x500 net/ipv6/mcast.c:2303
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xa68/0x1840 kernel/workqueue.c:3317
 rescuer_thread+0x63f/0x10a0 kernel/workqueue.c:3494
 kthread+0x7ab/0x920 kernel/kthread.c:464
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>