rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5907/1:b..l
rcu: 	(detected by 1, t=10506 jiffies, g=16041, q=998 ncpus=2)
task:kworker/0:4     state:R  running task     stack:24264 pid:5907  tgid:5907  ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:197
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:seqcount_lockdep_reader_access+0x17e/0x1c0 include/linux/seqlock.h:75
Code: f8 4d 85 e4 75 16 e8 b1 b2 12 f8 eb 15 e8 aa b2 12 f8 e8 35 fd c5 01 4d 85 e4 74 ea e8 9b b2 12 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:ffffc9000420f860 EFLAGS: 00000293
RAX: ffffffff89acfaf5 RBX: 0000000000000000 RCX: ffff888020b09e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000420f910 R08: ffffffff8fa2f037 R09: 1ffffffff1f45e06
R10: dffffc0000000000 R11: fffffbfff1f45e07 R12: 0000000000000200
R13: ffff888028c9c018 R14: 1ffff92000841f0c R15: dffffc0000000000
 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:342 [inline]
 gc_worker+0x308/0x1380 net/netfilter/nf_conntrack_core.c:1548
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 3685 jiffies! g16041 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=7438
rcu: rcu_preempt kthread starved for 3686 jiffies! g16041 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:26792 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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 UID: 0 PID: 6261 Comm: syz-execprog Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x3a/0xb0 kernel/rcu/tree.c:751
Code: e8 1b b1 cc 09 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd 10 6d bd 8d 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 <74> 08 4c 89 f7 e8 ec ce 7c 00 48 c7 c3 98 5f 9f 92 49 03 1e 48 89
RSP: 0000:ffffc90003e5fb28 EFLAGS: 00000046
RAX: 1ffffffff1b7ada2 RBX: 0000000000000000 RCX: 4880adb1c8cc6b00
RDX: 0000000000010000 RSI: ffffffff8be33ee0 RDI: ffffffff8be33ea0
RBP: 0000000000000001 R08: ffff888023ab415f R09: 1ffff1100475682b
R10: dffffc0000000000 R11: ffffed100475682c R12: ffff888023ab4360
R13: ffffffff899bb878 R14: ffffffff8dbd6d10 R15: dffffc0000000000
FS:  000000c00207e098(0000) GS:ffff888125c3d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0003b4008 CR3: 0000000075ca0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x4b/0x3e0 kernel/locking/lockdep.c:5879
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 advance_sched+0xb23/0xc90 net/sched/sch_taprio.c:992
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x529/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1050
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0033:0x41aab7
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 55 48 89 e5 48 83 ec 20 48 89 7c 24 48 48 89 74 24 50 48 89 7c 24 18 <eb> 07 48 89 d1 4c 89 cb 90 48 85 c9 0f 85 0e 01 00 00 48 85 ff 0f
RSP: 002b:000000c002083e50 EFLAGS: 00000206
RAX: 000000c0003b4460 RBX: 000000c0003b4460 RCX: 0000000000000000
RDX: 0000000000020000 RSI: 000000c0003c0000 RDI: 00000000013ae0e0
RBP: 000000c002083e70 R08: 000000c0003a0000 R09: 0000000000000000
R10: 0000000000014468 R11: 0000000000000002 R12: ffffffffffffffff
R13: 00000000000000d0 R14: 000000c001619880 R15: 000000c001f3f368
 </TASK>