rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4438/1:b..l
	(detected by 0, t=10502 jiffies, g=18301, q=195 ncpus=2)
task:kworker/1:7     state:R  running task     stack:22488 pid:4438  ppid:2      flags:0x00004000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6561
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6873
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:seqcount_lockdep_reader_access+0x202/0x220 include/linux/seqlock.h:105
Code: 0e 36 e0 45 4b c7 04 3c 00 00 00 00 66 43 c7 44 3c 09 00 00 43 c6 44 3c 0b 00 65 48 8b 04 25 28 00 00 00 48 3b 44 24 60 75 0f <48> 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 1a 31 c8 01 66 2e
RSP: 0018:ffffc9000479fa40 EFLAGS: 00000246
RAX: fbc7e90dec4e2700 RBX: 0000000000000000 RCX: ffff8880789bd940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000479faf0 R08: ffffffff88e962c9 R09: fffffbfff225765e
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 0000000000000200 R14: 0000000000000046 R15: 1ffff920008f3f48
 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:343 [inline]
 gc_worker+0x325/0x1540 net/netfilter/nf_conntrack_core.c:1503
 process_one_work+0x917/0x1260 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: rcu_preempt kthread starved for 10515 jiffies! g18301 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:26200 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6561
 schedule+0xbf/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 5540 Comm: syz.1.384 Not tainted 6.1.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: f1 84 f5 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 7e cb ae f6 48 89 df e8 e6 09 b0 f6 e8 a1 5b d5 f6 fb bf 01 00 00 00 <e8> f6 89 a2 f6 65 8b 05 b7 5f 46 75 85 c0 74 02 5b c3 e8 54 83 44
RSP: 0018:ffffc90003a17b30 EFLAGS: 00000286
RAX: 1dcc32fcaa4d3a00 RBX: ffff8880792a1bc0 RCX: ffffffff973c2103
RDX: dffffc0000000000 RSI: ffffffff8b0c1dc0 RDI: 0000000000000001
RBP: ffffc90003a17c70 R08: dffffc0000000000 R09: ffffed100f254379
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100f25440b
R13: 000000001c000004 R14: 0000000000000021 R15: ffff8880792a2058
FS:  00005555649a7500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d717ff8 CR3: 000000004fb38000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x151f/0x17a0 kernel/signal.c:2874
 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa51298d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffe1f96d28 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 00007fa512ba6168 RCX: 00007fa51298d169
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fa512ba6168
RBP: 0000000000000002 R08: 0000000000000006 R09: 00000019e1f9701f
R10: 00007fa512ba5fa0 R11: 0000000000000246 R12: 00007fa512ba616c
R13: 00007fa512ba6160 R14: 00000000000000fc R15: 0000000000000002
 </TASK>
vkms_vblank_simulate: vblank timer overrun