rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4259/1:b..l
	(detected by 1, t=10502 jiffies, g=7329, q=160)
task:kworker/1:7     state:R  running task     stack:24288 pid: 4259 ppid:     2 flags:0x00004000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 preempt_schedule_irq+0xb1/0x150 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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:205
Code: 84 00 00 00 00 00 53 48 89 fb e8 17 00 00 00 48 8b 3d 50 d3 f1 0b 48 89 de 5b e9 57 9e 43 00 00 00 cc cc 00 00 cc 48 8b 04 24 <65> 48 8b 0d a4 a3 8a 7e 65 8b 15 a5 a3 8a 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc9000338fad8 EFLAGS: 00000246
RAX: ffffffff88174090 RBX: 0000000000000000 RCX: ffff888027981dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000338fc30 R08: dffffc0000000000 R09: fffffbfff1ff7c2c
R10: fffffbfff1ff7c2c R11: 1ffffffff1ff7c2b R12: dffffc0000000000
R13: ffff888079841680 R14: 000000000002c399 R15: 0000000000040000
 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:338 [inline]
 gc_worker+0x300/0x13a0 net/netfilter/nf_conntrack_core.c:1472
 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 10501 jiffies! g7329 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:27008 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/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: 4390 Comm: syz.1.19 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__setup_rt_frame arch/x86/kernel/signal.c:524 [inline]
RIP: 0010:setup_rt_frame arch/x86/kernel/signal.c:780 [inline]
RIP: 0010:handle_signal arch/x86/kernel/signal.c:824 [inline]
RIP: 0010:arch_do_signal_or_restart+0xe7e/0x1300 arch/x86/kernel/signal.c:869
Code: 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 48 80 3c 01 00 48 8b 5c 24 50 4c 8b 74 24 30 74 08 48 89 df e8 e5 d4 92 00 4c 89 3b <48> b8 00 00 00 00 00 fc ff df 48 8b 4c 24 40 80 3c 01 00 48 8b 5c
RSP: 0018:ffffc90003edfcc0 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffc90003edfff0 RCX: 1ffff920007dbffe
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 00000000fffffff2
RBP: ffffc90003edfec0 R08: dffffc0000000000 R09: fffffbfff1ad33a6
R10: fffffbfff1ad33a6 R11: 1ffffffff1ad33a5 R12: ffffc90003edfde0
R13: 1ffff920007dbfff R14: ffffc90003edffe0 R15: 00007efc55b7ba78
FS:  00007efc55b7c6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 00000000501e0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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+0xee/0x180 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: 0033:0x7efc5793de00
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 0a 35 08 00 e8 d5 8e f8 ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007efc55b7ba78 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007efc57b6bfa0 RCX: 00007efc579156c9
RDX: 00007efc55b7ba80 RSI: 00007efc55b7bbb0 RDI: 0000000000000021
RBP: 00007efc57997f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efc57b6c038 R14: 00007efc57b6bfa0 R15: 00007ffecdc2aa28
 </TASK>