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WARNING: CPU: 0 PID: 7520 at arch/x86/kvm/../../../virt/kvm/pfncache.c:267 __kvm_gpc_refresh+0x1187/0x1310
Modules linked in:
CPU: 0 UID: 0 PID: 7520 Comm: syz.0.12866 Not tainted syzkaller #0 PREEMPT(full) 
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+0x1187/0x1310
Code: c6 05 7e f3 4c 0e 01 48 c7 c7 21 2d 9a 8d be 26 04 00 00 48 c7 c2 a0 e8 81 8b e8 b4 2b 5d 00 e9 fe f1 ff ff e8 8a 51 7f 00 90 <0f> 0b 90 bb ea ff ff ff e9 7e fe ff ff e8 77 51 7f 00 90 0f 0b 90
RSP: 0018:ffffc90002d371c0 EFLAGS: 00010293
RAX: ffffffff81405a06 RBX: ffff888000000000 RCX: ffff888021454880
RDX: 0000000000000000 RSI: ffff888000000000 RDI: ffff888000000000
RBP: ffffc90002d37348 R08: ffffffff8fa38937 R09: 1ffffffff1f47126
R10: dffffc0000000000 R11: fffffbfff1f47127 R12: ffff88801e9a13c0
R13: dffffc0000000000 R14: ffff888000000000 R15: ffffffffffffff01
FS:  00007f3fa5efb6c0(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3fa5eb9d58 CR3: 00000001190d3000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 kvm_gpc_refresh+0xe1/0x140
 kvm_xen_set_evtchn+0x164/0x230
 kvm_xen_hvm_evtchn_send+0x120/0x1e0
 kvm_arch_vm_ioctl+0xdaa/0x16b0
 kvm_vm_ioctl+0x85f/0xc60
 __se_sys_ioctl+0xf9/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3fa4f8ec29
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:00007f3fa5efb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3fa51d5fa0 RCX: 00007f3fa4f8ec29
RDX: 0000200000000000 RSI: 00000000400caed0 RDI: 0000000000000005
RBP: 00007f3fa5011e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3fa51d6038 R14: 00007f3fa51d5fa0 R15: 00007ffc8b6c02d8
 </TASK>
