------------[ cut here ]------------
kvm_is_error_gpa(gpa) == kvm_is_error_hva(uhva)
WARNING: arch/x86/kvm/../../../virt/kvm/pfncache.c:267 at __kvm_gpc_refresh+0x154c/0x1750 virt/kvm/pfncache.c:267, CPU#0: kworker/0:6/5319
Modules linked in:
CPU: 0 UID: 0 PID: 5319 Comm: kworker/0:6 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events irqfd_inject
RIP: 0010:__kvm_gpc_refresh+0x154c/0x1750 virt/kvm/pfncache.c:267
Code: c6 05 77 c1 d9 0e 01 48 c7 c7 96 14 f9 8d be 3c 04 00 00 48 c7 c2 e0 3d c2 8b e8 0f 17 61 00 e9 40 ee ff ff e8 65 e9 84 00 90 <0f> 0b 90 bb ea ff ff ff 49 bf 00 00 00 00 00 fc ff df e9 fa f5 ff
RSP: 0018:ffffc9000e437680 EFLAGS: 00010293
RAX: ffffffff8140e14b RBX: ffff888000000000 RCX: ffff88801f2fa500
RDX: 0000000000000000 RSI: ffff888000000000 RDI: ffff888000000000
RBP: ffffc9000e437810 R08: ffffffff9030ccf7 R09: 1ffffffff206199e
R10: dffffc0000000000 R11: fffffbfff206199f R12: 1ffff92001c86ee4
R13: ffff888034d19280 R14: ffff888000000000 R15: ffffffffffffff01
FS:  0000000000000000(0000) GS:ffff88808c885000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4661f01a40 CR3: 000000004249c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 kvm_gpc_refresh+0xe1/0x120 virt/kvm/pfncache.c:382
 kvm_xen_set_evtchn+0x163/0x230 arch/x86/kvm/xen.c:1942
 kvm_set_irq+0x2b6/0x5a0 virt/kvm/irqchip.c:88
 irqfd_inject+0xa6/0x100 virt/kvm/eventfd.c:49
 process_one_work kernel/workqueue.c:3302 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>