How to debug "insecure W+X mapping"?

[Timur Tabi]

We have a 4.10-based kernel that occasionally displays an insecure W+X 
mapping (courtesy of CONFIG_DEBUG_WX):

[    7.151680] arm64/mm: Found insecure W+X mapping at address 
0000345a049d2000/0x345a049d2000
...
[    7.435481] Checked W+X mappings: FAILED, 4 W+X pages found, 0 
non-UXN pages found

The number of actual W+X pages varies, e.g. sometimes it says 6 pages.

How do I go about debugging this? How do I identify the source of 
0000345a049d2000?

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