rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=fdac/1/0x4000000000000000 softirq=73475/73476 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=60333, q=278 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 15366 Comm: syz.0.2477 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:separate_irq_context kernel/locking/lockdep.c:4703 [inline]
RIP: 0010:__lock_acquire+0x742/0xd20 kernel/locking/lockdep.c:5221
Code: 83 e0 05 00 00 48 8d 04 9b 45 8b 66 20 48 8b 4c 24 10 8b 44 c1 f8 44 31 e0 25 00 60 00 00 31 c9 89 c2 f7 da 48 19 c9 49 09 cf <85> c0 b8 01 00 00 00 0f 45 e8 eb 4b 48 89 fb 4c 89 f6 a9 00 00 03
RSP: 0018:ffffc90000a08b70 EFLAGS: 00000086
RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffffffffffff
RDX: 00000000ffffc000 RSI: ffff888025318b58 RDI: ffff888025318000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81add142
R10: dffffc0000000000 R11: fffffbfff1f887c7 R12: 00000000000c406e
R13: 0000000000000002 R14: ffff888025318b58 R15: ffffffffffffffff
FS:  00007efff862b6c0(0000) GS:ffff888125ae1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c27a717 CR3: 000000005f064000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0xa2/0xf0 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1781 [inline]
 __hrtimer_run_queues+0x602/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 ab a0 41 f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 13 31 0a f6 65 8b 05 dc 08 3e 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc9001bbaf9e0 EFLAGS: 00000206
RAX: be2e1e7f86105c00 RBX: 0000000000000a06 RCX: be2e1e7f86105c00
RDX: 0000000000000007 RSI: ffffffff8dbbfea8 RDI: 0000000000000001
RBP: ffffc9001bbafa70 R08: ffffffff8fc43e37 R09: 1ffffffff1f887c6
R10: dffffc0000000000 R11: fffffbfff1f887c7 R12: dffffc0000000000
R13: ffff8880b8627ac0 R14: ffff8880b8627ac0 R15: 1ffff92003775f3c
 clock_was_set+0x63b/0x7c0 kernel/time/hrtimer.c:965
 do_adjtimex+0x8f0/0xb20 kernel/time/timekeeping.c:2753
 do_clock_adjtime kernel/time/posix-timers.c:1161 [inline]
 __do_sys_clock_adjtime kernel/time/posix-timers.c:1173 [inline]
 __se_sys_clock_adjtime kernel/time/posix-timers.c:1164 [inline]
 __x64_sys_clock_adjtime+0x1f7/0x2b0 kernel/time/posix-timers.c:1164
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efff778eba9
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:00007efff862b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007efff79d5fa0 RCX: 00007efff778eba9
RDX: 0000000000000000 RSI: 0000200000000480 RDI: 0000000000000000
RBP: 00007efff7811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efff79d6038 R14: 00007efff79d5fa0 R15: 00007ffe8209b968
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g60333 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:27224 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5360 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
 __schedule_loop kernel/sched/core.c:7046 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7061
 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+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 49 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 e6 77 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 91 73 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 75 73
RSP: 0018:ffffc90000ba7640 EFLAGS: 00000293
RAX: ffffffff81b4692b RBX: 1ffff110170e8005 RCX: ffff888021ac0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000ba77c0 R08: ffffffff8fc43e37 R09: 1ffffffff1f887c6
R10: dffffc0000000000 R11: fffffbfff1f887c7 R12: ffff8880b8740028
R13: dffffc0000000000 R14: ffff8880b863b240 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8881259e1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33421ff8 CR3: 000000000e138000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1044
 on_each_cpu include/linux/smp.h:71 [inline]
 smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2713 [inline]
 smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2923
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:852
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>