rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P1108/1:b..l
	(detected by 1, t=10502 jiffies, g=31305, q=29)
task:kworker/0:2     state:R  running task     stack:24576 pid: 1108 ppid:     2 flags:0x00004000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6780
 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:rcu_preempt_read_exit kernel/rcu/tree_plugin.h:380 [inline]
RIP: 0010:__rcu_read_unlock+0x2e/0xd0 kernel/rcu/tree_plugin.h:419
Code: 41 55 41 54 53 49 bf 00 00 00 00 00 fc ff df 65 48 8b 3d b5 2b 9e 7e 48 8d 9f 3c 04 00 00 49 89 dc 49 c1 ec 03 43 0f b6 04 3c <84> c0 75 48 ff 0b 75 1d 4c 8d b7 40 04 00 00 4c 89 f0 48 c1 e8 03
RSP: 0018:ffffc90004807ab0 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: ffff8880211521fc RCX: ffff888021151dc0
RDX: 0000000000000000 RSI: ffffffff8a59a2a0 RDI: ffff888021151dc0
RBP: ffffc90004807c30 R08: dffffc0000000000 R09: fffffbfff1ff342c
R10: fffffbfff1ff342c R11: 1ffffffff1ff342b R12: 1ffff1100422a43f
R13: ffff88802b9f4300 R14: 0000000000016560 R15: dffffc0000000000
 rcu_read_unlock include/linux/rcupdate.h:771 [inline]
 gc_worker+0xc3a/0x13a0 net/netfilter/nf_conntrack_core.c:1543
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 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 10528 jiffies! g31305 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27424 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6552
 preempt_schedule+0xa7/0xb0 kernel/sched/core.c:6577
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
 _raw_spin_unlock_irqrestore+0xf6/0x100 kernel/locking/spinlock.c:194
 prepare_to_swait_event+0x331/0x350 kernel/sched/swait.c:120
 rcu_gp_fqs_loop+0x269/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 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
CPU: 0 PID: 8740 Comm: syz.4.1429 Not tainted 5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:wants_signal kernel/signal.c:984 [inline]
RIP: 0010:complete_signal+0x13f/0xa20 kernel/signal.c:1001
Code: 89 de e8 c4 3a 2d 00 83 fb 09 75 1e e8 5a 37 2d 00 49 89 ed 49 bc 00 00 00 00 00 fc ff df e9 5d 03 00 00 e8 43 37 2d 00 eb 3f <4c> 8d 65 18 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f
RSP: 0018:ffffc90000007bf8 EFLAGS: 00000016
RAX: ffffffff814a86ac RBX: 0000000000000021 RCX: ffff888056c93b80
RDX: 0000000000010000 RSI: 0000000000000021 RDI: 0000000000000009
RBP: ffff88801dabbb80 R08: ffff888056c93b80 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000010000 R12: ffff88801dabbbac
R13: 0000000000000000 R14: 0000000100000000 R15: 0000000000000001
FS:  00007fb462c3f6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb462c3ed40 CR3: 000000005fdeb000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 send_sigqueue+0x3e9/0x620 kernel/signal.c:1999
 posix_timer_event kernel/time/posix-timers.c:359 [inline]
 posix_timer_fn+0x16a/0x3d0 kernel/time/posix-timers.c:385
 __run_hrtimer kernel/time/hrtimer.c:1690 [inline]
 __hrtimer_run_queues+0x53d/0xc40 kernel/time/hrtimer.c:1754
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1816
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: f6 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 4e d6 b1 f7 48 89 df e8 16 ab b2 f7 e8 51 4f d3 f7 fb bf 01 00 00 00 <e8> 46 cf a6 f7 65 8b 05 e7 e2 57 76 85 c0 74 02 5b c3 e8 94 ed 55
RSP: 0018:ffffc9000320fbc0 EFLAGS: 00000282
RAX: afcd6c489542c800 RBX: ffff8880732740c0 RCX: afcd6c489542c800
RDX: dffffc0000000000 RSI: ffffffff8a0b0fc0 RDI: 0000000000000001
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed100e64e819
R10: ffffed100e64e819 R11: 1ffff1100e64e818 R12: ffff8880732740c0
R13: 0000000000000021 R14: dffffc0000000000 R15: 000000001c000004
 spin_unlock_irq include/linux/spinlock.h:413 [inline]
 get_signal+0x11d6/0x12c0 kernel/signal.c:2903
 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb464e19967
Code: ff ff 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
RSP: 002b:00007fb462c3f0e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fb465041168 RCX: 00007fb464e19969
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb465041168
RBP: 00007fb465041160 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb46504116c
R13: 0000000000000000 R14: 00007ffc1e130a70 R15: 00007ffc1e130b58
 </TASK>