rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5796/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=14269, q=1221 ncpus=2)
task:kworker/0:7     state:R  running task     stack:25896 pid:5796  tgid:5796  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1295/0x67a0 kernel/sched/core.c:7189
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x205/0x7e0 kernel/entry/common.c:164
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_pc+0xb/0x70 kernel/kcov.c:213
Code: 61 00 be 03 00 00 00 5b e9 12 0b f1 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 05 85 ae 02 12 <48> 8b 34 24 65 48 8b 15 61 ae 02 12 a9 00 01 ff 00 74 1b f6 c4 01
RSP: 0018:ffffc90004bb7b38 EFLAGS: 00000202
RAX: 0000000080000000 RBX: 0000000000000001 RCX: ffffffff89afd59a
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88802ff98000
RBP: 00000000000039ed R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000040000 R14: 0000000000001cf6 R15: 0000000000001770
 rcu_read_unlock include/linux/rcupdate.h:867 [inline]
 gc_worker+0xf49/0x1630 net/netfilter/nf_conntrack_core.c:1614
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314
 process_scheduled_works kernel/workqueue.c:3397 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>