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: 6926 Comm: syz-executor298 Not tainted 4.17.0-rc5+ #60
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:ffff8801cf5e7108 EFLAGS: 00010206
RAX: 000000000400002b RBX: dffffc0000000000 RCX: 1ffff10039ebce3e
RDX: 0000000000000000 RSI: ffffffff876910ed RDI: ffff8801a1ef8928
RBP: ffff8801cf5e71a8 R08: ffff8801cb950100 R09: ffffed00343df109
R10: ffff8801cf5e72b8 R11: ffff8801a1ef884f R12: 0000000000000000
R13: ffff8801a1ef8928 R14: 0000000020000158 R15: ffff8801cf5e7230
FS:  00007f87bc9b9700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f87bc997e78 CR3: 00000001d8fc3000 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: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
 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: 0033:0x449b49
RSP: 002b:00007f87bc9b8da8 EFLAGS: 00000297 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dbc44 RCX: 0000000000449b49
RDX: 0000000020000140 RSI: 000000004018aebd RDI: 0000000000000007
RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000297 R12: 6d766b2f7665642f
R13: 6573756f6d2f7475 R14: 706e692f7665642f R15: 0000000000000007
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: ffff8801cf5e7108
RIP: __radix_tree_delete+0x74/0x230 lib/radix-tree.c:1987 RSP: ffff8801cf5e7108
---[ end trace 10c79fe52f17b897 ]---