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WARNING: CPU: 1 PID: 16738 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: 16738 Comm: syz-executor3 Not tainted 4.4.163+ #12
 0000000000000000 7ea7fdaf76d82d6d ffff8801c08df6e8 ffffffff81aa556d
 ffffffff828354e0 ffff8800b542df00 ffffffff82830a40 0000000000000009
 00000000000003f9 ffff8801c08df7a8 ffffffff813a1544 0000000041b58ab3
Call Trace:
 [<ffffffff81aa556d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81aa556d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff813a1544>] panic+0x19e/0x359 kernel/panic.c:112
 [<ffffffff813a1734>] warn_slowpath_common.cold.6+0x20/0x20 kernel/panic.c:455
 [<ffffffff810d4289>] warn_slowpath_null+0x29/0x30 kernel/panic.c:492
 [<ffffffff810b77b4>] untrack_pfn+0x214/0x270 arch/x86/mm/pat.c:1017
 [<ffffffff8142e623>] unmap_single_vma+0xea3/0x10d0 mm/memory.c:1322
 [<ffffffff814301a1>] unmap_vmas+0x81/0xd0 mm/memory.c:1373
 [<ffffffff8143c66e>] unmap_region+0x1ae/0x300 mm/mmap.c:2499
 [<ffffffff8144081d>] do_munmap+0x80d/0xd40 mm/mmap.c:2696
 [<ffffffff8144bde0>] move_vma+0x550/0x9a0 mm/mremap.c:334
 [<ffffffff8144cc2a>] mremap_to mm/mremap.c:453 [inline]
 [<ffffffff8144cc2a>] SYSC_mremap mm/mremap.c:516 [inline]
 [<ffffffff8144cc2a>] SyS_mremap+0x9fa/0xd90 mm/mremap.c:483
 [<ffffffff8100629e>] do_syscall_32_irqs_on arch/x86/entry/common.c:396 [inline]
 [<ffffffff8100629e>] do_fast_syscall_32+0x31e/0xa80 arch/x86/entry/common.c:463
 [<ffffffff82713b50>] sysenter_flags_fixed+0xd/0x1a
Kernel Offset: disabled
Rebooting in 86400 seconds..