------------[ cut here ]------------
WARNING: CPU: 1 PID: 12808 at arch/x86/kvm/../../../virt/kvm/pfncache.c:259 __kvm_gpc_refresh+0x15f8/0x2190 arch/x86/kvm/../../../virt/kvm/pfncache.c:259
Modules linked in:
CPU: 1 PID: 12808 Comm: syz-executor.0 Not tainted 6.9.0-rc5-syzkaller #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+0x15f8/0x2190 arch/x86/kvm/../../../virt/kvm/pfncache.c:259
Code: c1 ea 03 80 3c 02 00 0f 85 e3 0a 00 00 48 8b 3c 24 48 89 9d 08 01 00 00 31 db e8 33 34 c9 09 e9 a6 f4 ff ff e8 19 91 81 00 90 <0f> 0b 90 e9 93 f4 ff ff 48 8b 6c 24 28 e8 06 91 81 00 31 db e9 86
RSP: 0018:ffffc90023baf1a0 EFLAGS: 00010283
RAX: 0000000000005101 RBX: ffffffffffffffff RCX: ffffc9000c001000
RDX: 0000000000040000 RSI: ffffffff810cd3b7 RDI: 0000000000000000
RBP: ffffc900230fa400 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000002 R12: ffff888000000000
R13: ffff887fffffff01 R14: ffff888000000001 R15: ffffc90023baf2e8
FS:  0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:00000000f5efdb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000200000c0 CR3: 000000006881e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kvm_gpc_refresh+0xc3/0x140 arch/x86/kvm/../../../virt/kvm/pfncache.c:374
 kvm_xen_set_evtchn.part.0+0x196/0x270 arch/x86/kvm/xen.c:1888
 kvm_xen_set_evtchn arch/x86/kvm/xen.c:1978 [inline]
 kvm_xen_hvm_evtchn_send+0x231/0x290 arch/x86/kvm/xen.c:1968
 kvm_arch_vm_ioctl+0x11fd/0x1c10 arch/x86/kvm/x86.c:7239
 kvm_vm_ioctl+0x1afe/0x3e20 arch/x86/kvm/../../../virt/kvm/kvm_main.c:5347
 kvm_vm_compat_ioctl+0x39f/0x400 arch/x86/kvm/../../../virt/kvm/kvm_main.c:5427
 __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:386
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf730b579
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:00000000f5efd5ac EFLAGS: 00000292 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000400caed0
RDX: 00000000200000c0 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