rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P2733
	(detected by 0, t=10503 jiffies, g=6557, q=24)
kworker/0:18    R  running task    27576  2733      2 0x80004008
Workqueue: events linkwatch_event
Call Trace:
 <IRQ>
 sched_show_task+0x40f/0x560 kernel/sched/core.c:5954
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:190 [inline]
 print_other_cpu_stall kernel/rcu/tree_stall.h:398 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:538 [inline]
 rcu_pending kernel/rcu/tree.c:2827 [inline]
 rcu_sched_clock_irq+0x16b1/0x1ad0 kernel/rcu/tree.c:2271
 update_process_times+0x12d/0x180 kernel/time/timer.c:1726
 tick_sched_handle kernel/time/tick-sched.c:167 [inline]
 tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:free_thread_stack+0x195/0x590 kernel/fork.c:284
Code: 2e 00 74 08 4c 89 e7 e8 39 94 6a 00 49 8b 1c 24 48 83 c3 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 1b 94 6a 00 <48> 8b 1b e9 82 ff ff ff e8 be 2b 2e 00 43 80 3c 2e 00 75 18 eb 1e
RSP: 0018:ffffc90007b6f2f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff11012a10471 RBX: ffff888095082388 RCX: ffff88809fa84100
RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea000256b580
RBP: ffffc90007b6f328 R08: 000000000003a728 R09: fffffbfff124248a
R10: fffffbfff124248a R11: 0000000000000000 R12: ffff888095082420
R13: dffffc0000000000 R14: 1ffff11012a10484 R15: ffff88808c3595f8
 release_task_stack kernel/fork.c:440 [inline]
 put_task_stack+0xa3/0x130 kernel/fork.c:451
 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256
 context_switch kernel/sched/core.c:3388 [inline]
 __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081
 preempt_schedule_notrace+0xdb/0x120 kernel/sched/core.c:4309
 ___preempt_schedule_notrace+0x16/0x27 arch/x86/entry/thunk_64.S:51
 rcu_read_unlock_sched_notrace include/linux/rcupdate.h:755 [inline]
 trace_kmalloc+0x118/0x130 include/trace/events/kmem.h:46
 kmem_cache_alloc_trace+0x23a/0x2f0 mm/slab.c:3552
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:670 [inline]
 sctp_inet6addr_event+0x2b1/0x690 net/sctp/ipv6.c:85
 notifier_call_chain kernel/notifier.c:83 [inline]
 __atomic_notifier_call_chain+0x193/0x2e0 kernel/notifier.c:173
 atomic_notifier_call_chain+0x2d/0x40 kernel/notifier.c:183
 inet6addr_notifier_call_chain+0x24/0x30 net/ipv6/addrconf_core.c:109
 ipv6_add_addr+0x11d1/0x16d0 net/ipv6/addrconf.c:1150
 addrconf_add_linklocal+0x2c4/0xa40 net/ipv6/addrconf.c:3190
 addrconf_addr_gen+0x35d/0xc50 net/ipv6/addrconf.c:3317
 addrconf_dev_config+0x1c9/0x280 net/ipv6/addrconf.c:3360
 addrconf_notify+0xc8d/0x3c90 net/ipv6/addrconf.c:3595
 notifier_call_chain kernel/notifier.c:83 [inline]
 __raw_notifier_call_chain kernel/notifier.c:361 [inline]
 raw_notifier_call_chain+0xec/0x190 kernel/notifier.c:368
 call_netdevice_notifiers_info net/core/dev.c:1893 [inline]
 netdev_state_change+0x147/0x1f0 net/core/dev.c:1378
 linkwatch_do_dev+0x10e/0x160 net/core/link_watch.c:159
 __linkwatch_run_queue+0x446/0x730 net/core/link_watch.c:204
 linkwatch_event+0x4c/0x60 net/core/link_watch.c:243
 process_one_work+0x7ef/0x10d0 kernel/workqueue.c:2264
 worker_thread+0xc01/0x1630 kernel/workqueue.c:2410
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
rcu: rcu_preempt kthread starved for 10542 jiffies! g6557 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29104    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3385 [inline]
 __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081
 schedule+0x181/0x210 kernel/sched/core.c:4155
 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895
 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline]
 rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352