------------[ cut here ]------------
WARNING: CPU: 1 PID: 11717 at arch/x86/mm/pat.c:1017 untrack_pfn+0x214/0x270 arch/x86/mm/pat.c:1017()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 11717 Comm: syz-executor2 Not tainted 4.4.171+ #12
 0000000000000000 b97d7bb4208ce837 ffff88009196f7b8 ffffffff81aacd31
 0000000000000000 ffffffff82835ee0 ffffffff82831440 00000000000003f9
 ffffffff810b6b24 ffff88009196f898 ffffffff813a46b2 0000000041b58ab3
Call Trace:
 [<ffffffff81aacd31>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81aacd31>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff813a46b2>] panic+0x1b9/0x37b kernel/panic.c:112
 [<ffffffff813a48a9>] warn_slowpath_common kernel/panic.c:455 [inline]
 [<ffffffff813a48a9>] warn_slowpath_common.cold+0x20/0x20 kernel/panic.c:435
 [<ffffffff810d3aaa>] warn_slowpath_null+0x2a/0x30 kernel/panic.c:492
 [<ffffffff810b6b24>] untrack_pfn+0x214/0x270 arch/x86/mm/pat.c:1017
 [<ffffffff81432eee>] unmap_single_vma+0xe2e/0x1090 mm/memory.c:1322
 [<ffffffff81434ab8>] unmap_vmas+0x48/0xa0 mm/memory.c:1373
 [<ffffffff81441419>] unmap_region+0x1a9/0x320 mm/mmap.c:2499
 [<ffffffff8144534a>] do_munmap+0x4ca/0xcf0 mm/mmap.c:2696
 [<ffffffff81450bbe>] move_vma+0x50e/0x920 mm/mremap.c:334
 [<ffffffff814519ad>] mremap_to mm/mremap.c:453 [inline]
 [<ffffffff814519ad>] SYSC_mremap mm/mremap.c:516 [inline]
 [<ffffffff814519ad>] SyS_mremap+0x9dd/0xd60 mm/mremap.c:483
 [<ffffffff82717fe1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Kernel Offset: disabled
Rebooting in 86400 seconds..