Problems installing msys2 under reactos

Msys2 is a mingw-derived software distro for Windows using Arch Linux's Pacman.

I've tried to install msys (msys2-i686-20150916.exe) under React OS , wich you can get from

http://sourceforge.net/projects/msys2/files/Base/i686/msys2-i686-20150916.exe/download

Installation failed with a strange error message, "Execution Failed: Unexpected error code: -10734189") "C:\msys\autorebase.bat"
See the screenshots.
(The bug is reproducible, installation always fails at exactly the same point)

At his point, the last lines of the log were:

(ntoskrnl/mm/ARM3/virtual.c:5231) Unable to find VAD for address 0x60FF0000

Unhandled exception

ExceptionCode:    c0000005

Faulting Address:        0

CS:EIP 1b:61188e04

DS 23 ES 23 FS 3b GS 0

EAX: 00000000   EBX: 612fb5a0   ECX: 7c64fa2a

EDX: 00000000   EBP: 0022cc08   ESI: 00000000   ESP: 0022c46c

EDI: 0022c63c   EFLAGS: 00010202

Address:

   61000000+188e04     C:\MSYS32\usr\bin\msys-2.0.dll

Frames: 

   61000000+127560     C:\MSYS32\usr\bin\msys-2.0.dll

       8a1c<invalid address>

(but I couldn't get a back trace using the debugger!)

If I choose "Ignore" in the dialog, a similar error message appears:

"Execution Failed: Unexpected error code: -10734189") "C:\msys\usr\bin\bash.exe --login -c exit"

If I choose ignore again, installation seems to finish normally, but the program does not work (When I tried to run the .bat scripts from c:\msys, the terminal closed).