rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=45ec/1/0x4000000000000000 softirq=35004/35004 fqs=5
rcu: 	(detected by 1, t=10502 jiffies, g=32053, q=479 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9404 Comm: syz.9.1230 Not tainted 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:mark_usage kernel/locking/lockdep.c:4675 [inline]
RIP: 0010:__lock_acquire+0x68f/0xd20 kernel/locking/lockdep.c:5189
Code: 8b 3c 24 85 c0 0f 84 04 03 00 00 41 8b 47 20 a9 00 00 18 00 0f 84 c2 00 00 00 4c 89 fe ba 08 00 00 00 e8 a4 25 00 00 45 31 e4 <85> c0 0f 84 57 04 00 00 83 3d 72 20 e2 17 00 75 13 48 63 44 24 18
RSP: 0018:ffffc90000007b50 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff931dac58
RDX: 0000000000000008 RSI: ffff88802ae70b18 RDI: ffff88802ae70000
RBP: ffff88802ae70af0 R08: 0000000000000000 R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff89769f88 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: ffff88802ae70b18
FS:  00007ff8f3f346c0(0000) GS:ffff8881260cf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003c80 CR3: 0000000057f92000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 advance_sched+0xa14/0xc90 net/sched/sch_taprio.c:985
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x52c/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:1038 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
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 3b 70 6f 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> 53 f3 38 f6 65 8b 05 5c 45 1d 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90004e2fb80 EFLAGS: 00000206
RAX: e7477a9dbe9ac200 RBX: 0000000000000212 RCX: e7477a9dbe9ac200
RDX: 0000000000000007 RSI: ffffffff8d748227 RDI: 0000000000000001
RBP: ffffc90004e2fc10 R08: ffffffff8f7ebf77 R09: 1ffffffff1efd7ee
R10: dffffc0000000000 R11: fffffbfff1efd7ef R12: dffffc0000000000
R13: ffff8880b88276c0 R14: ffff8880b88276c0 R15: 1ffff920009c5f70
 clock_was_set+0x63b/0x7c0 kernel/time/hrtimer.c:972
 do_settimeofday64+0x2df/0x590 kernel/time/timekeeping.c:1381
 __do_sys_clock_settime kernel/time/posix-timers.c:1140 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1124 [inline]
 __x64_sys_clock_settime+0x22c/0x280 kernel/time/posix-timers.c:1124
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8f318e969
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:00007ff8f3f34038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007ff8f33b5fa0 RCX: 00007ff8f318e969
RDX: 0000000000000000 RSI: 0000200000003c80 RDI: 0000000000000000
RBP: 00007ff8f3210ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff8f33b5fa0 R15: 00007ffd1c779b38
 </TASK>
rcu: rcu_preempt kthread starved for 10492 jiffies! g32053 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:27496 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2248
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 64 Comm: kworker/u8:4 Not tainted 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xe6e/0x11c0 kernel/smp.c:885
Code: 89 ee 83 e6 01 31 ff e8 20 6d 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 cb 68 0b 00 eb 37 f3 90 43 0f b6 04 2c <84> c0 75 10 41 f7 07 01 00 00 00 74 1e e8 b0 68 0b 00 eb e5 44 89
RSP: 0018:ffffc90001567700 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b893ad40 RCX: ffff88801bf73c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90001567860 R08: ffffffff8f7ebf77 R09: 1ffffffff1efd7ee
R10: dffffc0000000000 R11: fffffbfff1efd7ef R12: 1ffff11017108245
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8841228
FS:  0000000000000000(0000) GS:ffff8881261cf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f20048e56c0 CR3: 000000000dd36000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:2455 [inline]
 text_poke_bp_batch+0x319/0x940 arch/x86/kernel/alternative.c:2665
 text_poke_flush arch/x86/kernel/alternative.c:2856 [inline]
 text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2863
 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:850
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>