rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P1109/1:b..l
	(detected by 1, t=10502 jiffies, g=7073, q=868)
task:kworker/1:2     state:R  running task     stack:24632 pid: 1109 ppid:     2 flags:0x00004000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:338 [inline]
RIP: 0010:gc_worker+0x2dd/0x1390 net/netfilter/nf_conntrack_core.c:1472
Code: 09 7f 54 f9 c6 05 6d 81 51 05 01 48 c7 c7 60 9f 24 8b be e6 02 00 00 48 c7 c2 a0 9f 24 8b e8 7a 76 8c 01 eb 05 e8 e3 7e 54 f9 <e8> fe 50 ff ff 8b 1d 68 d3 65 05 89 de 83 e6 01 31 ff e8 2c 82 54
RSP: 0018:ffffc90004effae0 EFLAGS: 00000293
RAX: ffffffff8824a05e RBX: 0000000000000001 RCX: ffff888021388000
RDX: 0000000000000000 RSI: ffffffff8a79f760 RDI: ffffffff8a79f720
RBP: ffffc90004effc30 R08: dffffc0000000000 R09: 1ffffffff203a218
R10: dffffc0000000000 R11: fffffbfff203a219 R12: dffffc0000000000
R13: ffff8880608c1200 R14: 000000000003565a R15: 0000000000040000
 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: rcu_preempt kthread starved for 9803 jiffies! g7073 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:28016 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x2be/0x11d0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9b/0x370 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 0 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:729
vkms_vblank_simulate: vblank timer overrun