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: 18062 Comm: syz-executor3 Not tainted 4.17.0-rc5+ #84
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:1987
RSP: 0018:ffff8801c9227168 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc900058c6000
RDX: 000000000000005f RSI: ffffffff876910ed RDI: ffff88018d56c468
RBP: ffff8801c9227208 R08: ffff880193294640 R09: ffffed0031aad871
R10: ffff8801c9227318 R11: ffff88018d56c38f R12: 0000000000000000
R13: ffff88018d56c468 R14: 0000000000000001 R15: ffff8801c9227290
FS:  0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f5ff4b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f5efec20 CR3: 00000001c5cd7000 CR4: 00000000001426f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 radix_tree_delete_item+0x148/0x2d0 lib/radix-tree.c:2048
 idr_remove+0x46/0x60 lib/idr.c:157
 kvm_hv_eventfd_deassign arch/x86/kvm/hyperv.c:1435 [inline]
 kvm_vm_ioctl_hv_eventfd+0x1df/0x24b arch/x86/kvm/hyperv.c:1453
 kvm_arch_vm_ioctl+0x155e/0x2690 arch/x86/kvm/x86.c:4566
 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: 0023:0xf7ff8cb9
RSP: 002b:00000000f5ff40ac EFLAGS: 00000282 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000019 RCX: 000000004018aebd
RDX: 0000000020000140 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 46 9a 88 48 c7 45 88 80 10 69 87 c7 00 f1 f1 f1 f1 c7 40 04 00 f2 f2 f2 c7 40 08 f3 f3 f3 f3 e8 03 1e 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: ffff8801c9227168
RIP: __radix_tree_delete+0x74/0x230 lib/radix-tree.c:1987 RSP: ffff8801c9227168
---[ end trace b186436ab819a771 ]---