rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P15/4:b..l.. P70/3:b..l..
rcu: 	(detected by 1, t=10502 jiffies, g=13161, q=805 ncpus=2)
task:kworker/u8:4    state:D stack:21400 pid:70    tgid:70    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56f0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule_rtlock+0x30/0x70 kernel/sched/core.c:7538
 rtlock_slowlock_locked+0x35c9/0x3c20 kernel/locking/rtmutex.c:1895
 rtlock_slowlock kernel/locking/rtmutex.c:1922 [inline]
 rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
 __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
 rt_spin_lock+0x165/0x400 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 tasklet_lock_callback kernel/softirq.c:934 [inline]
 tasklet_action_common+0xc5/0x600 kernel/softirq.c:984
 handle_softirqs+0x1d4/0x6c0 kernel/softirq.c:669
 __do_softirq kernel/softirq.c:703 [inline]
 __local_bh_enable_ip+0x16f/0x2b0 kernel/softirq.c:325
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 read_unlock_bh include/linux/rwlock_rt.h:73 [inline]
 ipv6_get_lladdr+0x2c9/0x400 net/ipv6/addrconf.c:1964
 mld_newpack+0x43e/0xcb0 net/ipv6/mcast.c:1824
 add_grhead net/ipv6/mcast.c:1921 [inline]
 add_grec+0x119f/0x19d0 net/ipv6/mcast.c:2060
 mld_send_initial_cr+0x288/0x550 net/ipv6/mcast.c:2305
 ipv6_mc_dad_complete+0x87/0x410 net/ipv6/mcast.c:2316
 addrconf_dad_completed+0x622/0xe60 net/ipv6/addrconf.c:4401
 addrconf_dad_work+0xdda/0x16e0 net/ipv6/addrconf.c:-1
 process_one_work kernel/workqueue.c:3495 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
task:ksoftirqd/0     state:R  running task     stack:22488 pid:15    tgid:15    ppid:2      task_flags:0x4208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56f0 kernel/sched/core.c:7382
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7662
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
 irqentry_exit+0x14f/0x9b0 kernel/entry/common.c:154
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:kasan_quarantine_put+0x6a/0x1f0 mm/kasan/quarantine.c:237
Code: 98 fb d1 93 01 75 32 41 f7 c7 00 02 00 00 74 05 e8 5b a5 95 ff 9c 58 a9 00 02 00 00 75 78 41 f7 c7 00 02 00 00 74 01 fb 31 c0 <5b> 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc cc 48 8d 80 80 fb d1 93
RSP: 0000:ffffc90000146e90 EFLAGS: 00000206
RAX: 0000000000000001 RBX: ffff88803f154800 RCX: 0000000000000046
RDX: 0000000000000002 RSI: ffffffff8dafbdfb RDI: ffffffff8bed2a80
RBP: 0000000000000000 R08: ffffffff90d594bf R09: 1ffffffff21ab297
R10: dffffc0000000000 R11: fffffbfff21ab298 R12: ffff88803f154800
R13: 0000000000000000 R14: 00000000000ee4c0 R15: 0000000000000286
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2780 [inline]
 slab_free mm/slub.c:6630 [inline]
 kfree+0x1c5/0x6d0 mm/slub.c:6923
 ieee80211_inform_bss+0xc59/0x1150 net/mac80211/scan.c:172
 rdev_inform_bss net/wireless/rdev-ops.h:457 [inline]
 cfg80211_inform_single_bss_data+0xd98/0x1bf0 net/wireless/scan.c:2447
 cfg80211_inform_bss_data+0x25b/0x3be0 net/wireless/scan.c:3303
 cfg80211_inform_bss_frame_data+0x51a/0xae0 net/wireless/scan.c:3399
 ieee80211_bss_info_update+0x772/0xa30 net/mac80211/scan.c:236
 ieee80211_scan_rx+0x552/0xa40 net/mac80211/scan.c:370
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5414 [inline]
 ieee80211_rx_list+0x4090/0x4c40 net/mac80211/rx.c:5765
 ieee80211_rx_napi+0x1ad/0x3d0 net/mac80211/rx.c:5790
 ieee80211_rx include/net/mac80211.h:5491 [inline]
 ieee80211_handle_queued_frames+0xe4/0x1d0 net/mac80211/main.c:452
 tasklet_action_common+0x31c/0x600 kernel/softirq.c:995
 handle_softirqs+0x1d4/0x6c0 kernel/softirq.c:669
 run_ksoftirqd+0x53/0x190 kernel/softirq.c:1133
 smpboot_thread_fn+0x5f8/0xb30 kernel/smpboot.c:162
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>