WARNING: CPU: 3 PID: 10209 at arch/x86/kvm/../../../virt/kvm/pfncache.c:247 __kvm_gpc_refresh+0x15e2/0x2200 arch/x86/kvm/../../../virt/kvm/pfncache.c:247
Modules linked in:
CPU: 3 PID: 10209 Comm: syz-executor.1 Not tainted 6.9.0-rc4-syzkaller-00038-g8cd26fd90c1a #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__kvm_gpc_refresh+0x15e2/0x2200 arch/x86/kvm/../../../virt/kvm/pfncache.c:247
Code: 48 c7 c2 60 40 02 8b be 7c 03 00 00 48 c7 c7 20 40 02 8b c6 05 dd 1f 7a 0e 01 e8 99 3b 5f 00 e9 31 fb ff ff e8 9f 82 81 00 90 <0f> 0b 90 e9 69 f7 ff ff e8 91 82 81 00 48 8b 54 24 40 48 b8 00 00
RSP: 0018:ffffc90002f0f6f0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffffffffffffff RCX: ffffffff810cbd6d
RDX: ffff888055318000 RSI: ffffffff810cd2f1 RDI: 0000000000000000
RBP: ffff88805d66e1a8 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000003 R12: ffffffffffffffff
R13: ffff887fffffff01 R14: 0000000000000040 R15: ffffc90007609a01
FS:  0000000000000000(0000) GS:ffff88802c500000(0063) knlGS:00000000f5e75b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f5e54da4 CR3: 0000000026a5c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __kvm_gpc_activate+0x251/0x3e0 arch/x86/kvm/../../../virt/kvm/pfncache.c:403
 kvm_xen_vcpu_set_attr+0xfb2/0x13c0 arch/x86/kvm/xen.c:890
 kvm_arch_vcpu_ioctl+0x1702/0x4300 arch/x86/kvm/x86.c:6265
 kvm_vcpu_ioctl+0xa2c/0x1090 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4620
 kvm_vcpu_compat_ioctl+0x216/0x3f0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4664
 __do_compat_sys_ioctl+0x2c3/0x330 fs/ioctl.c:1004
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf72a4579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f5e755ac EFLAGS: 00000292 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 000000004048aecb
RDX: 0000000020000080 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	10 06                	adc    %al,(%rsi)
   2:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   6:	10 07                	adc    %al,(%rdi)
   8:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   c:	10 08                	adc    %cl,(%rax)
   e:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1e:	00 51 52             	add    %dl,0x52(%rcx)
  21:	55                   	push   %rbp
  22:	89 e5                	mov    %esp,%ebp
  24:	0f 34                	sysenter
  26:	cd 80                	int    $0x80
* 28:	5d                   	pop    %rbp <-- trapping instruction
  29:	5a                   	pop    %rdx
  2a:	59                   	pop    %rcx
  2b:	c3                   	ret
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	90                   	nop
  2f:	90                   	nop
  30:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  37:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi