WARNING: CPU: 1 PID: 12260 at arch/x86/mm/pat.c:1020 untrack_pfn+0x203/0x250 arch/x86/mm/pat.c:1020
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 12260 Comm: syz-executor.2 Not tainted 4.14.271-syzkaller #0
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+0x1b2/0x281 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x44 kernel/panic.c:547
 report_bug+0x208/0x250 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:untrack_pfn+0x203/0x250 arch/x86/mm/pat.c:1020
RSP: 0018:ffff88805322f9c0 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88809e61ba50 RCX: ffffc90008a23000
RDX: 0000000000040000 RSI: ffffffff8124e9a3 RDI: ffff888052b3f9d0
RBP: 1ffff1100a645f38 R08: ffff88805322f948 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88809e61baa0
 unmap_single_vma+0x16b/0x2b0 mm/memory.c:1561
 unmap_vmas+0x9d/0x160 mm/memory.c:1612
 exit_mmap+0x270/0x4d0 mm/mmap.c:3058
 __mmput kernel/fork.c:931 [inline]
 mmput kernel/fork.c:952 [inline]
 mmput+0xfa/0x420 kernel/fork.c:947
 dup_mm kernel/fork.c:1216 [inline]
 copy_mm kernel/fork.c:1255 [inline]
 copy_process.part.0+0x4dc5/0x71c0 kernel/fork.c:1791
 copy_process kernel/fork.c:1606 [inline]
 _do_fork+0x184/0xc80 kernel/fork.c:2092
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7ffa225ba049
RSP: 002b:00007ffa20f2f118 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffa226ccf60 RCX: 00007ffa225ba049
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffa20f2f1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffddbecd76f R14: 00007ffa20f2f300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..