------------[ cut here ]------------
WARNING: CPU: 1 PID: 14809 at arch/x86/mm/pat.c:1017 untrack_pfn+0x1f0/0x290 arch/x86/mm/pat.c:1024
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 14809 Comm: syz-executor4 Not tainted 4.13.0-rc1+ #1
kobject: 'loop5' (ffff8801d22c8aa0): kobject_uevent_env
kobject: 'loop5' (ffff8801d22c8aa0): fill_kobj_path: path = '/devices/virtual/block/loop5'
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x145/0x1e1 lib/dump_stack.c:52
 panic+0x1a9/0x34e kernel/panic.c:180
 __warn.cold.8+0x11a/0x156 kernel/panic.c:541
kobject: 'loop5' (ffff8801d22c8aa0): kobject_uevent_env
kobject: 'loop5' (ffff8801d22c8aa0): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop3' (ffff8801d21f7220): kobject_uevent_env
kobject: 'loop3' (ffff8801d21f7220): fill_kobj_path: path = '/devices/virtual/block/loop3'
 report_bug+0x1a3/0x227 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:190 [inline]
 do_trap_no_signal arch/x86/kernel/traps.c:224 [inline]
 do_trap+0x1ef/0x2d0 arch/x86/kernel/traps.c:273
 do_error_trap+0x11f/0x390 arch/x86/kernel/traps.c:310
kobject: 'loop5' (ffff8801d22c8aa0): kobject_uevent_env
kobject: 'loop5' (ffff8801d22c8aa0): fill_kobj_path: path = '/devices/virtual/block/loop5'
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:323
 invalid_op+0x1e/0x30 arch/x86/entry/entry_64.S:845
RIP: 0010:untrack_pfn+0x1f0/0x290 arch/x86/mm/pat.c:1017
RSP: 0018:ffff8801c402efc0 EFLAGS: 00010282
RAX: 00000000ffffffea RBX: ffff8801b7ee6300 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffffffff89da63c0
RBP: ffff8801c402f098 R08: 0000000000000001 R09: 0000000000000000
R10: ffff8801d969efa0 R11: ffff8801d969e740 R12: 1ffff10038805dfa
R13: 0000000000000000 R14: ffff8801c402f070 R15: ffff8801c402eff0
 unmap_single_vma+0x144/0x300 mm/memory.c:1412
 unmap_vmas+0xe2/0x190 mm/memory.c:1463
 exit_mmap+0x204/0x3b0 mm/mmap.c:2994
 __mmput kernel/fork.c:903 [inline]
 mmput+0x1e0/0x640 kernel/fork.c:925
 exit_mm kernel/exit.c:544 [inline]
 do_exit+0xc0c/0x17d0 kernel/exit.c:852
 do_group_exit+0x135/0x3b0 kernel/exit.c:969
 get_signal+0x78c/0x15f0 kernel/signal.c:2330
 do_signal+0x94/0x2210 arch/x86/kernel/signal.c:808
 exit_to_usermode_loop+0x1bc/0x280 arch/x86/entry/common.c:157
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath+0x2cb/0x360 arch/x86/entry/common.c:263
 entry_SYSCALL_64_fastpath+0xc0/0xc2
RIP: 0033:0x4577b9
RSP: 002b:00007f8d6eaf5cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bf08 RCX: 00000000004577b9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bf08
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bf0c
R13: 00007ffefce6324f R14: 00007f8d6eaf69c0 R15: 000000000072bf0c
Kernel Offset: disabled
Rebooting in 86400 seconds..