------------[ 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#0: syz.4.3415/20055
Modules linked in:
CPU: 0 UID: 0 PID: 20055 Comm: syz.4.3415 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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 52 c2 9a e8 b0 3a 85 00 b8 01 00 00 00 87 05 25 c5 1e 19 85 c0 0f 85 3d 01 00 00 90 <0f> 0b 90 48 c7 c3 74 e4 88 90 48 81 fd 80 46 3d 8e 74 5a 48 b8 00
RSP: 0018:ffffc90000007df0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000002904 RCX: ffffffff81a38d90
RDX: fffffbfff3584a58 RSI: 0000000000000004 RDI: ffffffff9ac252c0
RBP: ffffffff8e3d4680 R08: 0000000000000001 R09: fffffbfff3584a58
R10: 0000000000000003 R11: ffff88802e9daff0 R12: 1ffffffff1c02250
R13: 0000000000000246 R14: ffffffff8e3d4680 R15: ffff8880b843bc52
FS:  00007f0b89e576c0(0000) GS:ffff8881248f5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000080160000 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_writel arch/x86/kvm/vmx/vmx_ops.h:227 [inline]
RIP: 0010:vmcs_write32 arch/x86/kvm/vmx/vmx_ops.h:245 [inline]
RIP: 0010:__vmx_set_segment+0x310/0x9f0 arch/x86/kvm/vmx/vmx.c:3757
Code: 8b 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e a7 05 00 00 48 89 e8 48 c1 e0 04 44 8b b8 68 0c 85 8b 45 0f 79 fe <2e> 0f 86 ee 03 00 00 e8 04 bd 6b 00 48 8d 7b 0c 48 b8 00 00 00 00
RSP: 0018:ffffc9000f7e7378 EFLAGS: 00000202
RAX: 0000000000000020 RBX: ffffc9000f7e7400 RCX: ffffc900167ec000
RDX: 1ffffffff170a191 RSI: ffffffff815328f6 RDI: ffffffff8b850c88
RBP: 0000000000000002 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88802e9daff0 R12: ffff88804b7ea940
R13: 0000000000000002 R14: 000000000000ffff R15: 0000000000004804
 vmx_set_segment+0x24/0x190 arch/x86/kvm/vmx/vmx.c:3779
 kvm_set_segment arch/x86/kvm/x86.c:7779 [inline]
 emulator_set_segment+0x2af/0x350 arch/x86/kvm/x86.c:8670
 set_segment_selector+0x143/0x1c0 arch/x86/kvm/emulate.c:595
 load_state_from_tss32 arch/x86/kvm/emulate.c:2784 [inline]
 task_switch_32+0xdd0/0x1c90 arch/x86/kvm/emulate.c:2871
 emulator_do_task_switch arch/x86/kvm/emulate.c:2944 [inline]
 emulator_task_switch+0x74d/0x2810 arch/x86/kvm/emulate.c:2985
 kvm_task_switch+0x20d/0x800 arch/x86/kvm/x86.c:12263
 __vmx_handle_exit arch/x86/kvm/vmx/vmx.c:6760 [inline]
 vmx_handle_exit+0x129b/0x1a00 arch/x86/kvm/vmx/vmx.c:6770
 vcpu_enter_guest arch/x86/kvm/x86.c:11481 [inline]
 vcpu_run+0x3468/0x5a80 arch/x86/kvm/x86.c:11639
 kvm_arch_vcpu_ioctl_run+0xfd3/0x1860 arch/x86/kvm/x86.c:11984
 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: 0033:0x7f0b88f8f749
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:00007f0b89e57038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0b891e5fa0 RCX: 00007f0b88f8f749
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 00007f0b89013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0b891e6038 R14: 00007f0b891e5fa0 R15: 00007ffc24ee4178
 </TASK>
----------------
Code disassembly (best guess):
   0:	8b 48 89             	mov    -0x77(%rax),%ecx
   3:	fa                   	cli
   4:	48 c1 ea 03          	shr    $0x3,%rdx
   8:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax
   c:	84 c0                	test   %al,%al
   e:	74 08                	je     0x18
  10:	3c 03                	cmp    $0x3,%al
  12:	0f 8e a7 05 00 00    	jle    0x5bf
  18:	48 89 e8             	mov    %rbp,%rax
  1b:	48 c1 e0 04          	shl    $0x4,%rax
  1f:	44 8b b8 68 0c 85 8b 	mov    -0x747af398(%rax),%r15d
  26:	45 0f 79 fe          	vmwrite %r14,%r15
* 2a:	2e 0f 86 ee 03 00 00 	jbe,pn 0x41f <-- trapping instruction
  31:	e8 04 bd 6b 00       	call   0x6bbd3a
  36:	48 8d 7b 0c          	lea    0xc(%rbx),%rdi
  3a:	48                   	rex.W
  3b:	b8 00 00 00 00       	mov    $0x0,%eax