------------[ cut here ]------------
WARNING: CPU: 2 PID: 3799 at arch/x86/kvm/mmu.c:719 mmu_spte_clear_track_bits+0x35a/0x3f0 arch/x86/kvm/mmu.c:719
Kernel panic - not syncing: panic_on_warn set ...

CPU: 2 PID: 3799 Comm: syz-executor7 Not tainted 4.13.0-rc6-next-20170823+ #7
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x41c kernel/panic.c:181
 __warn+0x1c4/0x1e0 kernel/panic.c:542
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:190
 do_trap_no_signal arch/x86/kernel/traps.c:224 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:273
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:310
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:323
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:929
RIP: 0010:mmu_spte_clear_track_bits+0x35a/0x3f0 arch/x86/kvm/mmu.c:719
RSP: 0018:ffff88006a82e800 EFLAGS: 00010297
RAX: ffff880067862340 RBX: 1ffff1000d505d02 RCX: 1ffff1000d505d06
RDX: 0000000000000000 RSI: 1ffff1000d505d16 RDI: ffffea0000ba969c
RBP: ffff88006a82e918 R08: ffff88006a82e758 R09: ffff88006a82e750
R10: ffff88006a82e6c8 R11: 1ffff1000cf0c6fb R12: 400000002ea5a075
R13: 0000000000000000 R14: ffff88006a82e8f0 R15: 000000000002ea5a
 drop_spte+0x24/0x250 arch/x86/kvm/mmu.c:1351
 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:5271 [inline]
 kvm_mmu_invalidate_zap_all_pages+0x4a0/0x680 arch/x86/kvm/mmu.c:5312
 kvm_arch_flush_shadow_all+0x15/0x20 arch/x86/kvm/x86.c:8394
 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+0x415/0x510 mm/mmap.c:2981
 __mmput kernel/fork.c:915 [inline]
 mmput+0x223/0x6d0 kernel/fork.c:936
 exit_mm kernel/exit.c:544 [inline]
 do_exit+0x9a1/0x1b40 kernel/exit.c:852
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x7e8/0x17e0 kernel/signal.c:2334
 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: 0033:0x446749
RSP: 002b:00007f608d750cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 0000000000708170 RCX: 0000000000446749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000708170
RBP: 0000000000708150 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f608d7519c0 R15: 00007f608d751700
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..