Crash when running from Cmder

[Sh4rK]

I use Cmder (https://github.com/cmderdev/cmder) as it's much nicer than the basic cmd. However, flinux crashes immediatly with it trying to run anything. Flog: http://pastebin.com/yJsgUHZU

I traced down the cause: mm_init calls mm_mmap to allocate memory for the static alloc (static_alloc_begin). mm_mmap calls mmap_internal, which then calls find_free_pages_topdown, and there's where the error happens, as the returned address range is already partly VirtualAlloc-ed by something else (some part of Cmder). Then the VirtualAlloc obviously fails later on in mmap_internal.

I don't understand exactly how everything works, but shouldn't find_free_pages_topdown and find_free_pages check whether the memory regions are already allocated or not?

[wishstudio]

I believe this relates to issue #20 , which I planned to fix but haven't :-p

Your guess is right, currently we don't check if the memory is actually available in find_free_pages[_topdown].

My plan is to test the availability using VirtualQuery(), if the memory region is unavailable, create a special placeholder map_entry to avoid future confusions and restart.