rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5935/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=14149, q=428452 ncpus=2)
task:kworker/0:6     state:R  running task     stack:26224 pid:5935  tgid:5935  ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0x116a/0x5dd0 kernel/sched/core.c:6786
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7109
 irqentry_exit+0x36/0x90 kernel/entry/common.c:307
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_cmp4+0x0/0x20 kernel/kcov.c:287
Code: 0c 24 0f b7 d6 0f b7 f7 bf 02 00 00 00 e9 18 ff ff ff 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 0c 24 89 f2 89 fe bf 04 00 00 00 e9 ea fe ff ff
RSP: 0018:ffffc90005737b50 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000040000 RCX: ffffffff89ab72b1
RDX: ffff88807c8da440 RSI: 0000000000040000 RDI: 0000000000009950
RBP: ffffffff9b26fa8c R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888024c00000
R13: 0000000000009950 R14: dffffc0000000000 R15: 0000000000001781
 gc_worker+0x342/0x16e0 net/netfilter/nf_conntrack_core.c:1552
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>