rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5831/1:b..l P8284/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=26461, q=1479349 ncpus=2)
task:kworker/0:11    state:R  running task     stack:26752 pid:8284  tgid:8284  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6908
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7235
 irqentry_exit+0x599/0x620 kernel/entry/common.c:239
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x20b/0x2e0 kernel/locking/lockdep.c:5872
Code: e9 30 ff ff ff e8 35 59 0c 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 b1 46 7a 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 16 3f 0f 0a cc 48 8d 3d 3e 55 73
RSP: 0018:ffffc90003847960 EFLAGS: 00000296
RAX: bcab022fc711f700 RBX: 0000000000000246 RCX: 0000000000000046
RDX: 000000007b88381f RSI: ffffffff8e1655da RDI: ffffffff8c27b380
RBP: 0000000000000000 R08: ffffffff89ca30bd R09: ffffffff8e75e3e0
R10: dffffc0000000000 R11: fffffbfff2023177 R12: 0000000000000002
R13: ffffffff8e75e3e0 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 rcu_read_lock include/linux/rcupdate.h:850 [inline]
 gc_worker+0x281/0x1290 net/netfilter/nf_conntrack_core.c:1546
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
 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>
task:syz-executor    state:R  running task     stack:21480 pid:5831  tgid:5831  ppid:1      task_flags:0x40054c flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6908
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7092
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_read_unlock include/linux/rwlock_api_smp.h:254 [inline]
 _raw_read_unlock+0x3f/0x50 kernel/locking/spinlock.c:260
 zap_pid_ns_processes+0x2c9/0x5f0 kernel/pid_namespace.c:233
 find_child_reaper kernel/exit.c:622 [inline]
 forget_original_parent kernel/exit.c:706 [inline]
 exit_notify kernel/exit.c:743 [inline]
 do_exit+0x1f8f/0x23c0 kernel/exit.c:988
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1118
 get_signal+0x1284/0x1330 kernel/signal.c:3034
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
 do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f78ba95cfce
RSP: 002b:00007f78bad3fd28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: 0000000000000000 RBX: 00005555794fd500 RCX: 00007f78ba95cfce
RDX: 00007f78bad3fd80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f78bad3fdec R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000000c8
R13: 0000000000000049 R14: 0000000000026bfc R15: 00007f78bad3fe40
 </TASK>