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: 1 PID: 6067 Comm: syz-executor1 Not tainted 4.17.0-rc2+ #48
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:ffff8801adc67168 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc900074c3000
RDX: 000000000000005f RSI: ffffffff8768eeed RDI: ffff8801d282f0a8
RBP: ffff8801adc67208 R08: ffff88019ad8c100 R09: ffffed003a505df9
R10: ffff8801adc67318 R11: ffff8801d282efcf R12: 0000000000000000
R13: ffff8801d282f0a8 R14: 0000000000000001 R15: ffff8801adc67290
FS:  0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:00000000f5f65b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000002bc24000 CR3: 00000001b5958000 CR4: 00000000001426e0
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
 kvm_vm_compat_ioctl+0x13b/0x420 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3141
 __do_compat_sys_ioctl fs/compat_ioctl.c:1461 [inline]
 __se_compat_sys_ioctl fs/compat_ioctl.c:1407 [inline]
 __ia32_compat_sys_ioctl+0x221/0x640 fs/compat_ioctl.c:1407
 do_syscall_32_irqs_on arch/x86/entry/common.c:323 [inline]
 do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:394
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f69cb9
RSP: 002b:00000000f5f650ac EFLAGS: 00000282 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 000000004018aebd
RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 3f 9a 88 48 c7 45 88 80 ee 68 87 c7 00 f1 f1 f1 f1 c7 40 04 00 f2 f2 f2 c7 40 08 f3 f3 f3 f3 e8 a3 51 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: ffff8801adc67168
RIP: __radix_tree_delete+0x74/0x230 lib/radix-tree.c:1989 RSP: ffff8801adc67168
---[ end trace 5ff7710d2d6a32a8 ]---