rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4432/1:b..l
	(detected by 0, t=10503 jiffies, g=12785, q=16 ncpus=2)
task:kworker/0:8     state:R  running task     stack:25520 pid:4432  ppid:2      flags:0x00004000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
 irqentry_exit+0x63/0x70 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+0x17b/0x1c0 include/linux/seqlock.h:105
Code: f9 4d 85 e4 75 16 e8 74 1a 1f f9 eb 15 e8 6d 1a 1f f9 e8 28 de b5 01 4d 85 e4 74 ea e8 5e 1a 1f f9 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:ffffc900042e7a20 EFLAGS: 00000293
RAX: ffffffff8861b492 RBX: 0000000000000000 RCX: ffff88802a848000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900042e7ad0 R08: dffffc0000000000 R09: fffffbfff215c45b
R10: fffffbfff215c45b R11: 1ffffffff215c45a R12: 0000000000000200
R13: ffff88807d138e40 R14: 1ffff9200085cf44 R15: dffffc0000000000
 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:354 [inline]
 gc_worker+0x30c/0x13d0 net/netfilter/nf_conntrack_core.c:1517
 process_one_work+0x898/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: rcu_preempt kthread starved for 10528 jiffies! g12785 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:27464 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 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: 5153 Comm: syz.4.202 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:_static_cpu_has arch/x86/include/asm/cpufeature.h:180 [inline]
RIP: 0010:pkru_write_default arch/x86/include/asm/pkru.h:56 [inline]
RIP: 0010:restore_fpregs_from_init_fpstate arch/x86/kernel/fpu/core.c:672 [inline]
RIP: 0010:fpu__clear_user_states+0x13f/0x260 arch/x86/kernel/fpu/core.c:727
Code: 51 00 be ff 00 06 00 48 c7 c7 40 34 5e 8c ba 01 00 00 00 e8 43 6b 00 00 48 c7 c7 80 34 5e 8c b8 ff 00 06 00 31 d2 48 0f ae 2f <e9> f7 00 00 00 e8 37 b6 51 00 48 c7 c0 a0 40 9b 8c 48 c1 e8 03 42
RSP: 0018:ffffc900037e7c88 EFLAGS: 00000246
RAX: 00000000000600ff RBX: ffff88807ce5d940 RCX: 0000000000080000
RDX: 0000000000000000 RSI: 000000000007ffff RDI: ffffffff8c5e3480
RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520006fcf76
R10: fffff520006fcf76 R11: 1ffff920006fcf70 R12: ffff88807ce5f240
R13: dffffc0000000000 R14: ffff88807ce5f240 R15: ffffffff812f17a6
FS:  00007fc94913f6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2e9cbb CR3: 0000000077294000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 handle_signal arch/x86/kernel/signal.c:844 [inline]
 arch_do_signal_or_restart+0xe9e/0x1230 arch/x86/kernel/signal.c:873
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc94824d9b0
Code: 44 24 20 0f 29 44 24 30 0f 29 44 24 40 48 8b 44 24 08 ff d0 48 83 c4 50 31 c0 5b 5d 41 5c 41 5d 41 5e c3 0f 1f 80 00 00 00 00 <c3> 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 c3 66 66 2e 0f 1f
RSP: 002b:00007fc94913eb38 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fc9485e6098 RCX: 00007fc94838eec9
RDX: 00007fc94913eb40 RSI: 00007fc94913ec70 RDI: 0000000000000011
RBP: 00007fc9485e6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc9485e6128 R14: 00007ffd08a5b460 R15: 00007ffd08a5b548
 </TASK>