rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P3438/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=214997, q=502522 ncpus=2)
task:kworker/0:2     state:R  running task     stack:20328 pid:3438  tgid:3438  ppid:2      task_flags:0x4208160 flags:0x00080000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5352 [inline]
 __schedule+0x165c/0x5560 kernel/sched/core.c:6964
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7292
 irqentry_exit+0x5e4/0x700 kernel/entry/common.c:240
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x36/0x90 kernel/kcov.c:314
Code: 38 2a 7c 11 65 8b 0d 59 2a 7c 11 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 8c 16 00 00 00 74 52 8b 8a 68 16 00 00 <83> f9 03 75 47 48 8b 8a 70 16 00 00 44 8b 8a 6c 16 00 00 49 c1 e1
RSP: 0018:ffffc9000e31f9d8 EFLAGS: 00000246
RAX: ffffffff89d86088 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff8880339edb80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000e31fb30 R08: ffffffff903444f7 R09: 1ffffffff206889e
R10: dffffc0000000000 R11: fffffbfff206889f R12: dffffc0000000000
R13: ffff888033a2eb18 R14: 0000000000000000 R15: 000000000000ec8e
 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:343 [inline]
 gc_worker+0x318/0x1290 net/netfilter/nf_conntrack_core.c:1548
 process_one_work+0x9a3/0x1710 kernel/workqueue.c:3288
 process_scheduled_works kernel/workqueue.c:3379 [inline]
 worker_thread+0xba8/0x11e0 kernel/workqueue.c:3465
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>