WARNING: CPU: 1 PID: 6043 at arch/x86/kvm/x86.c:8376 __x86_set_memory_region+0x56e/0x7a0 arch/x86/kvm/x86.c:8376
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 6043 Comm: syz-executor4 Not tainted 4.15.0-rc8-next-20180119+ #102
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
FAULT_FLAG_ALLOW_RETRY missing 30
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1096
RIP: 0010:__x86_set_memory_region+0x56e/0x7a0 arch/x86/kvm/x86.c:8376
RSP: 0018:ffff8801bb6776a0 EFLAGS: 00010246
RAX: 0000000000010000 RBX: ffff8801bb6777a8 RCX: ffffffff810b57fe
RDX: 0000000000010000 RSI: ffffc90003c9f000 RDI: 0000000000000286
RBP: ffff8801bb6777d0 R08: 0000000000000000 R09: 1ffff100376cee8f
R10: ffff8801bb677440 R11: 0000000000000001 R12: ffff8801bb677768
R13: 1ffff100376ceed9 R14: ffff8801a6fe3f00 R15: 0000000000000000
 x86_set_memory_region+0x3e/0x60 arch/x86/kvm/x86.c:8388
 kvm_arch_destroy_vm+0x7ab/0x980 arch/x86/kvm/x86.c:8404
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:729 [inline]
 kvm_put_kvm+0x695/0xde0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:750
 kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2378
 __fput+0x327/0x7e0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x199/0x270 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x275/0x2f0 arch/x86/entry/common.c:165
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x9e/0xa0
RIP: 0033:0x452ee9
RSP: 002b:00007f024a761c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 000000000071bea0 RCX: 0000000000452ee9
RDX: 0000000020329000 RSI: 000000004138ae84 RDI: 0000000000000015
RBP: 0000000000000254 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2880
R13: 00000000ffffffff R14: 00007f024a7626d4 R15: 0000000000000000
CPU: 0 PID: 6041 Comm: syz-executor0 Not tainted 4.15.0-rc8-next-20180119+ #102
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 handle_userfault+0xbd9/0x2500 fs/userfaultfd.c:430
 do_anonymous_page mm/memory.c:3149 [inline]
 handle_pte_fault mm/memory.c:3963 [inline]
 __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4089
 handle_mm_fault+0x38f/0x930 mm/memory.c:4126
 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505
 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1260
RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline]
RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421
RSP: 0018:ffff8801bb6f7928 EFLAGS: 00010246
RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff825ab721
RDX: 000000000000010c RSI: ffffc9000226b000 RDI: ffff8801bb6f7d28
RBP: ffff8801bb6f7a08 R08: ffff8801c2cf91a0 R09: 1ffff100376deed1
R10: ffff8801bb6f7858 R11: 0000000000000003 R12: 1ffff100376def28
R13: ffff8801bb6f79e0 R14: 0000000000000000 R15: ffff8801bb6f7d20
 generic_perform_write+0x200/0x600 mm/filemap.c:3128
 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263
 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291
 call_write_iter include/linux/fs.h:1775 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x684/0x970 fs/read_write.c:482
 vfs_write+0x189/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452ee9
RSP: 002b:00007f543f162c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ee9
RDX: 000000000000001c RSI: 0000000020011fd2 RDI: 0000000000000014
RBP: 0000000000000069 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006efa78
R13: 00000000ffffffff R14: 00007f543f1636d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..