------------[ cut here ]------------
WARNING: CPU: 0 PID: 9587 at arch/x86/kvm/../../../virt/kvm/pfncache.c:267 __kvm_gpc_refresh+0x14dd/0x1bb0 virt/kvm/pfncache.c:267
Modules linked in:
CPU: 0 UID: 0 PID: 9587 Comm: syz.3.1039 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__kvm_gpc_refresh+0x14dd/0x1bb0 virt/kvm/pfncache.c:267
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 65 05 00 00 48 8b ad 10 01 00 00 31 db e9 b3 f8 ff ff e8 b4 6f 84 00 90 <0f> 0b 90 e9 c4 fa ff ff 48 8b 6c 24 60 e8 a1 6f 84 00 31 db e9 4b
RSP: 0018:ffffc9000720f5e8 EFLAGS: 00010283
RAX: 0000000000000768 RBX: ffffffffffffffff RCX: ffffc90030938000
RDX: 0000000000080000 RSI: ffffffff81389bdc RDI: 0000000000000000
RBP: ffff8880359e53e0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000001 R12: ffff888000000000
R13: ffff8880359e5401 R14: ffff888000000001 R15: ffffc9000720f7f8
FS:  00007f27743586c0(0000) GS:ffff8880d6a0a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c37fdd0 CR3: 0000000034eac000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 kvm_gpc_refresh+0xec/0x190 virt/kvm/pfncache.c:382
 kvm_xen_set_evtchn.part.0+0x19c/0x270 arch/x86/kvm/xen.c:1943
 kvm_xen_set_evtchn arch/x86/kvm/xen.c:1905 [inline]
 kvm_xen_inject_timer_irqs+0x1e9/0x2b0 arch/x86/kvm/xen.c:118
 kvm_xen_vcpu_get_attr+0x932/0xa50 arch/x86/kvm/xen.c:1241
 kvm_arch_vcpu_ioctl+0x276d/0x5570 arch/x86/kvm/x86.c:6616
 kvm_vcpu_ioctl+0x1235/0x1690 virt/kvm/kvm_main.c:4647
 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/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f277358efc9
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:00007f2774358038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f27737e5fa0 RCX: 00007f277358efc9
RDX: 0000200000000080 RSI: 00000000c048aeca RDI: 0000000000000008
RBP: 00007f2773611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f27737e6038 R14: 00007f27737e5fa0 R15: 00007ffdb6a86a38
 </TASK>