------------[ cut here ]------------
WARNING: kernel/rcu/tree_stall.h:1049 at rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1049, CPU#1: syz.3.3015/16825
Modules linked in:
CPU: 1 UID: 0 PID: 16825 Comm: syz.3.3015 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1049
Code: 88 61 01 00 00 be 04 00 00 00 48 c7 c7 c0 92 c2 9a e8 00 41 85 00 b8 01 00 00 00 87 05 55 f3 1e 19 85 c0 0f 85 3d 01 00 00 90 <0f> 0b 90 48 c7 c3 74 fe 88 90 48 81 fd 80 46 3d 8e 74 5a 48 b8 00
RSP: 0018:ffffc90000a08df0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000002904 RCX: ffffffff81a39f60
RDX: fffffbfff3585258 RSI: 0000000000000004 RDI: ffffffff9ac292c0
RBP: ffffffff8e3d4680 R08: 0000000000000001 R09: fffffbfff3585258
R10: 0000000000000003 R11: ffff888077bd0b30 R12: 1ffffffff1c02250
R13: 0000000000000246 R14: ffffffff8e3d4680 R15: ffff8880b853bc52
FS:  00007f7edc16b6c0(0000) GS:ffff8881249f1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007a892000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:1012 [inline]
 rcu_core+0x4cf/0x15f0 kernel/rcu/tree.c:2852
 handle_softirqs+0x219/0x950 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__vmcs_readl arch/x86/kvm/vmx/vmx_ops.h:121 [inline]
RIP: 0010:vmcs_read32 arch/x86/kvm/vmx/vmx_ops.h:168 [inline]
RIP: 0010:vmx_get_gdt+0x16/0x110 arch/x86/kvm/vmx/vmx.c:3806
Code: 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 48 89 f3 e8 22 c8 6b 00 b8 10 48 00 00 0f 78 c5 <3e> 77 0b 31 ed 55 50 e8 6e 28 25 0a 58 5d 48 b9 00 00 00 00 00 fc
RSP: 0018:ffffc9001c337310 EFLAGS: 00000202
RAX: 0000000000004810 RBX: ffffc9001c337390 RCX: ffffc9000dd4a000
RDX: 0000000000080000 RSI: ffffffff8153342e RDI: ffff88807b795280
RBP: 00000000000007ff R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000000 R11: ffff888077bd0b30 R12: 1ffff92003866e66
R13: 0000000000000050 R14: ffffc9001c337490 R15: ffff88804e16d088
 get_descriptor_table_ptr arch/x86/kvm/emulate.c:1431 [inline]
 get_descriptor_ptr+0x1f9/0x490 arch/x86/kvm/emulate.c:1441
 read_segment_descriptor arch/x86/kvm/emulate.c:1469 [inline]
 __load_segment_descriptor+0x4ae/0x14c0 arch/x86/kvm/emulate.c:1586
 em_jmp_far+0x15a/0x550 arch/x86/kvm/emulate.c:2158
 x86_emulate_insn+0x50a/0x4140 arch/x86/kvm/emulate.c:5426
 x86_emulate_instruction+0x48a/0x1c00 arch/x86/kvm/x86.c:9530
 kvm_mmu_page_fault+0xbfd/0x1c60 arch/x86/kvm/mmu/mmu.c:6464
 handle_ept_misconfig arch/x86/kvm/vmx/vmx.c:5926 [inline]
 handle_ept_misconfig+0x11a/0x380 arch/x86/kvm/vmx/vmx.c:5908
 __vmx_handle_exit arch/x86/kvm/vmx/vmx.c:6752 [inline]
 vmx_handle_exit+0x726/0x1a00 arch/x86/kvm/vmx/vmx.c:6770
 vcpu_enter_guest arch/x86/kvm/x86.c:11490 [inline]
 vcpu_run+0x3468/0x5a80 arch/x86/kvm/x86.c:11648
 kvm_arch_vcpu_ioctl_run+0xfd3/0x1860 arch/x86/kvm/x86.c:11993
 kvm_vcpu_ioctl+0x76d/0x16d0 virt/kvm/kvm_main.c:4492
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7edb38f749
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:00007f7edc16b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7edb5e5fa0 RCX: 00007f7edb38f749
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f7edb413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7edb5e6038 R14: 00007f7edb5e5fa0 R15: 00007ffeb19f7828
 </TASK>
----------------
Code disassembly (best guess):
   0:	0f 1f 40 00          	nopl   0x0(%rax)
   4:	90                   	nop
   5:	90                   	nop
   6:	90                   	nop
   7:	90                   	nop
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	f3 0f 1e fa          	endbr64
  18:	55                   	push   %rbp
  19:	53                   	push   %rbx
  1a:	48 89 f3             	mov    %rsi,%rbx
  1d:	e8 22 c8 6b 00       	call   0x6bc844
  22:	b8 10 48 00 00       	mov    $0x4810,%eax
  27:	0f 78 c5             	vmread %rax,%rbp
* 2a:	3e 77 0b             	ja,pt  0x38 <-- trapping instruction
  2d:	31 ed                	xor    %ebp,%ebp
  2f:	55                   	push   %rbp
  30:	50                   	push   %rax
  31:	e8 6e 28 25 0a       	call   0xa2528a4
  36:	58                   	pop    %rax
  37:	5d                   	pop    %rbp
  38:	48                   	rex.W
  39:	b9 00 00 00 00       	mov    $0x0,%ecx
  3e:	00 fc                	add    %bh,%ah