kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 25868 Comm: syz-executor5 Not tainted 4.17.0-rc5+ #54
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline]
RIP: 0010:__radix_tree_delete+0x74/0x230 lib/radix-tree.c:1989
RSP: 0018:ffff8801d8dd7108 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc90002ade000
RDX: 0000000000000048 RSI: ffffffff8769130d RDI: ffff88018784b728
RBP: ffff8801d8dd71a8 R08: ffff88018836c540 R09: ffffed0030f096c9
R10: ffff8801d8dd72b8 R11: ffff88018784b64f R12: 0000000000000000
R13: ffff88018784b728 R14: 0000000000000003 R15: ffff8801d8dd7230
FS:  00007fefc7335700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000072bea0 CR3: 00000001ad40d000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 radix_tree_delete_item+0x148/0x2d0 lib/radix-tree.c:2050
 idr_remove+0x46/0x60 lib/idr.c:157
 kvm_hv_eventfd_deassign arch/x86/kvm/hyperv.c:1433 [inline]
 kvm_vm_ioctl_hv_eventfd+0x1df/0x24b arch/x86/kvm/hyperv.c:1451
 kvm_arch_vm_ioctl+0x155e/0x2690 arch/x86/kvm/x86.c:4563
 kvm_vm_ioctl+0x246/0x1d90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3100
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
RSP: 002b:00007fefc7334c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fefc73356d4 RCX: 0000000000455a09
RDX: 0000000020000140 RSI: 000000004018aebd RDI: 0000000000000018
RBP: 000000000072bf50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000271 R14: 00000000006f7b38 R15: 0000000000000001
Code: 46 9a 88 48 c7 45 88 a0 12 69 87 c7 00 f1 f1 f1 f1 c7 40 04 00 f2 f2 f2 c7 40 08 f3 f3 f3 f3 e8 e3 1b 10 fa 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 0f 85 97 01 00 00 48 8d 55 d8 4c 8d 7a c0 49 8b 1e 
RIP: __read_once_size include/linux/compiler.h:188 [inline] RSP: ffff8801d8dd7108
RIP: __radix_tree_delete+0x74/0x230 lib/radix-tree.c:1989 RSP: ffff8801d8dd7108
---[ end trace dc6707e6766e7ea6 ]---