rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=afcc/1/0x4000000000000000 softirq=42017/42017 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=49613, q=87 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11882 Comm: syz.5.1645 Not tainted 6.13.0-rc7-syzkaller-00102-gce69b4019001 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:lockdep_recursion_inc kernel/locking/lockdep.c:462 [inline]
RIP: 0010:lock_acquire+0x1b0/0x550 kernel/locking/lockdep.c:5848
Code: 00 42 80 3c 2b 00 74 08 4c 89 ff e8 ea 9f 88 00 48 8d 5c 24 60 4c 8b bc 24 80 00 00 00 fa 48 c7 c7 20 a6 0a 8c e8 80 88 46 0a <65> ff 05 b9 d9 87 7e 45 31 c9 41 f7 c7 00 02 00 00 41 0f 94 c1 48
RSP: 0018:ffffc90000a189e0 EFLAGS: 00000086
RAX: 0000000000000001 RBX: ffffc90000a18a40 RCX: ffffffff817aafe4
RDX: 0000000000000000 RSI: ffffffff8c0aa620 RDI: ffffffff8c5edea0
RBP: ffffc90000a18b28 R08: ffffffff90185937 R09: 1ffffffff2030b26
R10: dffffc0000000000 R11: fffffbfff2030b27 R12: 1ffff92000143144
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000046
FS:  00007fef1d1576c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020003c80 CR3: 00000000126e8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
 debug_object_activate+0x17f/0x580 lib/debugobjects.c:818
 debug_hrtimer_activate kernel/time/hrtimer.c:428 [inline]
 debug_activate kernel/time/hrtimer.c:469 [inline]
 enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1076
 __run_hrtimer kernel/time/hrtimer.c:1756 [inline]
 __hrtimer_run_queues+0x6cb/0xd30 kernel/time/hrtimer.c:1803
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1865
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x420 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_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 4a f9 b6 f5 48 89 df e8 82 40 b8 f5 e8 bd 4e e3 f5 fb bf 01 00 00 00 <e8> a2 a5 a9 f5 65 8b 05 e3 f6 3f 74 85 c0 74 06 5b c3 cc cc cc cc
RSP: 0018:ffffc9000bbe7d00 EFLAGS: 00000286
RAX: 8312faed37b9c400 RBX: ffff88807bea1488 RCX: ffffffff9a378903
RDX: dffffc0000000000 RSI: ffffffff8c0a98e0 RDI: 0000000000000001
RBP: 00000000ffffff83 R08: ffffffff90185937 R09: 1ffffffff2030b26
R10: dffffc0000000000 R11: fffffbfff2030b27 R12: ffff88807bea1400
R13: 7fffffffffffffff R14: 0000000000000003 R15: ffff88807bea1480
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 do_timerfd_settime+0xccf/0xfb0 fs/timerfd.c:523
 __do_sys_timerfd_settime fs/timerfd.c:569 [inline]
 __se_sys_timerfd_settime fs/timerfd.c:560 [inline]
 __x64_sys_timerfd_settime+0x16f/0x220 fs/timerfd.c:560
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fef1c385d29
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:00007fef1d157038 EFLAGS: 00000246 ORIG_RAX: 000000000000011e
RAX: ffffffffffffffda RBX: 00007fef1c575fa0 RCX: 00007fef1c385d29
RDX: 0000000020000000 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007fef1c401b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fef1c575fa0 R15: 00007ffec4ecacb8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g49613 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=39787
rcu: rcu_preempt kthread starved for 10502 jiffies! g49613 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:25976 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x17fb/0x4be0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
vkms_vblank_simulate: vblank timer overrun