rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6143/3:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=9357, q=1906 ncpus=2)
task:syz-executor    state:R  running task     stack:28952 pid:6143  tgid:6143  ppid:5982   task_flags:0x400040 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6961
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7145
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 filemap_map_pages+0xe15/0x1670 mm/filemap.c:3791
 do_fault_around mm/memory.c:5531 [inline]
 do_read_fault mm/memory.c:5564 [inline]
 do_fault mm/memory.c:5707 [inline]
 do_pte_missing+0xe39/0x3ba0 mm/memory.c:4234
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
 handle_mm_fault+0x589/0xd10 mm/memory.c:6364
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f7b5754d7f0
RSP: 002b:00007ffc760b7f08 EFLAGS: 00010206
RAX: 0000000000000008 RBX: 0000000000000000 RCX: 00007f7b5758548d
RDX: 0000000000000000 RSI: 0000000000000018 RDI: 00005555901e27e0
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 00005555901e27d0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000063 R14: 000000000001c0ff R15: 00007ffc760b80a0
 </TASK>
rcu: rcu_preempt kthread starved for 10497 jiffies! g9357 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:28728 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:7058
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2285
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d4/0x6f0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 92 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events_power_efficient gc_worker
RIP: 0010:hlock_class+0x15/0x70 kernel/locking/lockdep.c:246
Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f b7 47 20 66 25 ff 1f 0f b7 c0 48 0f a3 05 0d ef 45 14 73 15 <48> 8d 04 80 48 8d 04 80 48 8d 04 c5 60 49 dd 95 c3 cc cc cc cc 8b
RSP: 0000:ffffc90000a08ce0 EFLAGS: 00000003
RAX: 000000000000006d RBX: ffff88801f748af0 RCX: 00000000fffffffe
RDX: 0000000000000000 RSI: ffff88801f748b68 RDI: ffff88801f748b68
RBP: 0000000000000000 R08: 0000000000080000 R09: 0000000000000001
R10: 0000000000000003 R11: 0000000000000000 R12: ffff88801f748b68
R13: ffff88801f748000 R14: 0000000000000003 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8881247b8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7b5754d7f0 CR3: 0000000023f13000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __lock_acquire+0x62e/0x1ce0 kernel/locking/lockdep.c:5234
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1765 [inline]
 __hrtimer_run_queues+0x2bc/0xad0 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:344 [inline]
RIP: 0010:gc_worker+0x305/0x16e0 net/netfilter/nf_conntrack_core.c:1548
Code: 1d 40 bd f1 06 41 89 dc 31 ff 41 83 e4 01 44 89 e6 e8 9f 45 01 f8 45 84 e4 0f 85 46 0e 00 00 e8 b1 4a 01 f8 8b 05 57 bd f1 06 <4c> 8b 25 64 bd f1 06 89 44 24 60 44 8b 2d 09 bd f1 06 89 de 44 89
RSP: 0000:ffffc900025bfb58 EFLAGS: 00000293
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffffff89ba4371
RDX: ffff88801f748000 RSI: ffffffff89ba437f RDI: 0000000000000001
RBP: ffffffff9b2c82ac R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000040000 R14: dffffc0000000000 R15: 0000000000001770
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>