rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P13270/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=152081, q=403 ncpus=2)
task:kworker/1:3     state:R  running task     stack:20200 pid:13270 ppid:2      flags:0x00004000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:seqcount_lockdep_reader_access+0x17f/0x1c0 include/linux/seqlock.h:105
Code: f8 4d 85 e4 75 16 e8 90 b2 d9 f8 eb 15 e8 89 b2 d9 f8 e8 54 81 c2 01 4d 85 e4 74 ea e8 7a b2 d9 f8 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 66 43 c7 44 3e 09 00 00 43 c6 44 3e 0b 00
RSP: 0018:ffffc9000431f9a0 EFLAGS: 00000293
RAX: ffffffff88abd856 RBX: 0000000000000000 RCX: ffff88802dc89e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000431fa50 R08: ffffffff90da758f R09: 1ffffffff21b4eb1
R10: dffffc0000000000 R11: fffffbfff21b4eb2 R12: 0000000000000200
R13: dffffc0000000000 R14: 1ffff92000863f34 R15: dffffc0000000000
 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:350 [inline]
 gc_worker+0x317/0x14b0 net/netfilter/nf_conntrack_core.c:1504
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: rcu_preempt kthread starved for 10528 jiffies! g152081 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27080 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 18606 Comm: syz.2.3343 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:41 [inline]
RIP: 0010:get_signal+0x42/0x1400 kernel/signal.c:2672
Code: 24 50 65 48 8b 04 25 28 00 00 00 48 89 84 24 b8 00 00 00 49 be 00 00 00 00 00 fc ff df e8 06 9a 31 00 65 4c 8b 3d ee c6 af 7e <4d> 89 fc 49 8d bf 18 09 00 00 48 89 f8 48 c1 e8 03 42 80 3c 30 00
RSP: 0018:ffffc90003447ca8 EFLAGS: 00000246
RAX: ffffffff8153f0ca RBX: 1ffff92000688fb8 RCX: 0000000000080000
RDX: ffffc90013979000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90003447ec0 R08: ffffc90003447e37 R09: 0000000000000000
R10: ffffc90003447de0 R11: fffff52000688fc7 R12: ffffc90003447f58
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff88802b1fbc00
FS:  00007fd3ed5d46c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa647c65f3a CR3: 0000000063b65000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 arch_do_signal_or_restart+0x96/0x780 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd3ec78eec9
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:00007fd3ed5d40e8 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00007fd3ec9e5fa8 RCX: 00007fd3ec78eec9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd3ec9e5fa8
RBP: 00007fd3ec9e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd3ec9e6038 R14: 00007ffff9895bc0 R15: 00007ffff9895ca8
 </TASK>