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: 6132 Comm: syz-executor7 Not tainted 4.13.0-rc4-next-20170811 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88003d49e040 task.stack: ffff8800399b0000
RIP: 0010:__kvm_memslots include/linux/kvm_host.h:573 [inline]
RIP: 0010:gfn_to_rmap+0x624/0x770 arch/x86/kvm/mmu.c:1237
RSP: 0018:ffff8800399b6788 EFLAGS: 00010297
RAX: dffffc0000000000 RBX: ffff88004faebb38 RCX: 1ffff10009f5d75c
RDX: 0000000000000000 RSI: ffff88004faf6e88 RDI: ffff88004faebb40
RBP: ffff8800399b6908 R08: ffffffff8111d5b1 R09: 0000000000000000
R10: ffff8800399b6cb0 R11: ffff88002beab118 R12: 0000000000000002
R13: 000000000000000f R14: 000000000000000e R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000039a7e000 CR4: 00000000000026f0
Call Trace:
 rmap_remove arch/x86/kvm/mmu.c:1269 [inline]
 drop_spte+0x14f/0x250 arch/x86/kvm/mmu.c:1352
 mmu_page_zap_pte+0x224/0x340 arch/x86/kvm/mmu.c:2484
 kvm_mmu_page_unlink_children arch/x86/kvm/mmu.c:2506 [inline]
 kvm_mmu_prepare_zap_page+0x1c5/0x1310 arch/x86/kvm/mmu.c:2550
 kvm_zap_obsolete_pages arch/x86/kvm/mmu.c:5227 [inline]
 kvm_mmu_invalidate_zap_all_pages+0x4a0/0x680 arch/x86/kvm/mmu.c:5268
 kvm_arch_flush_shadow_all+0x15/0x20 arch/x86/kvm/x86.c:8391
 kvm_mmu_notifier_release+0x59/0x90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:508
 __mmu_notifier_release+0x1d5/0x690 mm/mmu_notifier.c:75
 mmu_notifier_release include/linux/mmu_notifier.h:235 [inline]
 exit_mmap+0x479/0x560 mm/mmap.c:2982
 __mmput kernel/fork.c:905 [inline]
 mmput+0x223/0x6e0 kernel/fork.c:927
 exit_mm kernel/exit.c:544 [inline]
 do_exit+0x9a1/0x1b30 kernel/exit.c:852
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x7e8/0x17e0 kernel/signal.c:2330
 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808
 exit_to_usermode_loop+0x224/0x300 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath+0x42f/0x500 arch/x86/entry/common.c:266
 entry_SYSCALL_64_fastpath+0xbc/0xbe
RIP: 0033:0x446739
RSP: 002b:00007fb1c9feccf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 0000000000708170 RCX: 0000000000446739
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000708170
RBP: 0000000000708150 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb1c9fed9c0 R15: 00007fb1c9fed700
Code: 3f 02 00 00 48 c7 c7 80 58 e2 84 c6 05 36 f7 09 05 01 e8 10 92 44 00 e9 46 fb ff ff e8 26 bd 5d 00 48 b8 00 00 00 00 00 fc ff df <80> 38 00 0f 85 32 01 00 00 4c 8b 24 25 00 00 00 00 31 db e9 ef 
RIP: __kvm_memslots include/linux/kvm_host.h:573 [inline] RSP: ffff8800399b6788
RIP: gfn_to_rmap+0x624/0x770 arch/x86/kvm/mmu.c:1237 RSP: ffff8800399b6788
---[ end trace 87291a4970efa900 ]---