------------[ cut here ]------------
WARNING: CPU: 0 PID: 21821 at kernel/rcu/tree_stall.h:1015 rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1015
Modules linked in:
CPU: 0 UID: 0 PID: 21821 Comm: syz.8.3952 Not tainted 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470 kernel/rcu/tree_stall.h:1015
Code: ff ff 48 c7 c7 40 34 a9 99 be 04 00 00 00 e8 43 02 7a 00 4c 89 f7 b8 01 00 00 00 87 05 35 8e 01 18 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff c0 41 14 8e 74 47 48 c7 c0 30 12 a0 8f 48 c1 e8
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: ffffffff81a7a5fd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8e1441c0
RBP: ffffc90000007e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff3352688 R12: 0000000000002904
R13: 1ffff110170c75c2 R14: ffffffff8e1441c0 R15: dffffc0000000000
FS:  00007fe7f4fd56c0(0000) GS:ffff888125c84000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e907ff8 CR3: 0000000066268000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 rcu_core+0x5f7/0x1710 kernel/rcu/tree.c:2827
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 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:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xf69/0x12d0 kernel/smp.c:885
Code: 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 b0 79 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 5b 75 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 40 75 0b
RSP: 0018:ffffc9000e2df600 EFLAGS: 00000246
RAX: ffffffff81b4d850 RBX: ffff8880b863b040 RCX: 0000000000080000
RDX: ffffc9001b337000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000e2df760 R08: ffffffff8f9fe0f7 R09: 1ffffffff1f3fc1e
R10: dffffc0000000000 R11: fffffbfff1f3fc1f R12: 1ffff110170e7f2d
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b873f968
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 on_each_cpu include/linux/smp.h:71 [inline]
 smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2691 [inline]
 smp_text_poke_batch_finish+0x5e0/0x1100 arch/x86/kernel/alternative.c:2901
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_slow_inc_cpuslocked+0x80/0xf0 kernel/jump_label.c:168
 static_key_slow_inc+0x1a/0x30 kernel/jump_label.c:191
 kvm_create_lapic+0x110/0x400 arch/x86/kvm/lapic.c:2914
 kvm_arch_vcpu_create+0x1ec/0x920 arch/x86/kvm/x86.c:12348
 kvm_vm_ioctl_create_vcpu+0x429/0x930 virt/kvm/kvm_main.c:4192
 kvm_vm_ioctl+0x7f7/0xc60 virt/kvm/kvm_main.c:5138
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe7f718e929
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:00007fe7f4fd5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe7f73b6160 RCX: 00007fe7f718e929
RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000009
RBP: 00007fe7f7210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe7f73b6160 R15: 00007ffd6558dbc8
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	45 8b 2f             	mov    (%r15),%r13d
   3:	44 89 ee             	mov    %r13d,%esi
   6:	83 e6 01             	and    $0x1,%esi
   9:	31 ff                	xor    %edi,%edi
   b:	e8 b0 79 0b 00       	call   0xb79c0
  10:	41 83 e5 01          	and    $0x1,%r13d
  14:	49 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%r13
  1b:	fc ff df
  1e:	75 07                	jne    0x27
  20:	e8 5b 75 0b 00       	call   0xb7580
  25:	eb 37                	jmp    0x5e
  27:	f3 90                	pause
* 29:	43 0f b6 04 2c       	movzbl (%r12,%r13,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	75 10                	jne    0x42
  32:	41 f7 07 01 00 00 00 	testl  $0x1,(%r15)
  39:	74 1e                	je     0x59
  3b:	e8                   	.byte 0xe8
  3c:	40 75 0b             	rex jne 0x4a