gdb try 2 for winpthreads issue Alexpux/MINGW-packages#709

gdb.log

$ pacman -Q mingw-w64-i686-gcc mingw-w64-i686-gdb
mingw-w64-i686-gcc 5.2.0-3
mingw-w64-i686-gdb 7.9.1-3

$ /mingw32/bin/python2.7 /mingw32/bin/mypaint -c /tmp/freshmypaintconfig
ERROR: mypaint: Failed to load MyPaint's C extension. This probably means that MyPaint was not correctly installed, or was built incorrectly.
Traceback (most recent call last):
  File "C:/msys64/mingw32/bin/mypaint", line 191, in get_paths
    from lib import mypaintlib
  File "C:/msys64/mingw32/share/mypaint/lib/mypaintlib.py", line 28, in <module>
    _mypaintlib = swig_import_helper()
  File "C:/msys64/mingw32/share/mypaint/lib/mypaintlib.py", line 20, in swig_import_helper
    import _mypaintlib
ImportError: DLL load failed: Invalid access to memory location.
INFO: mypaint: script: 'C:/msys64/mingw32/bin/mypaint'
INFO: mypaint: deduced prefix: u'C:/msys64/mingw32'
INFO: mypaint: lib_shared: u'C:/msys64/mingw32/share/mypaint'
INFO: mypaint: lib_compiled: u'C:/msys64/mingw32/lib/mypaint'
INFO: mypaint: sys.path: [u'C:/msys64/mingw32/share', u'C:/msys64/mingw32/lib/mypaint', u'C:/msys64/mingw32/share/mypaint', 'C:/msys64/mingw32/bin', 'C:/msys64/mingw32/lib/python27.zip', 'C:/msys64/mingw32/lib/python2.7', 'C:/msys64/mingw32/lib/python2.7/plat-win32', 'C:/msys64/mingw32/lib/python2.7/lib-tk', 'C:/msys64/mingw32/lib/python2.7/lib-old', 'C:/msys64/mingw32/lib/python2.7/lib-dynload', 'C:/building/msys32/mingw32', 'C:/msys64/mingw32/lib/python2.7/site-packages']
Segmentation fault

$ gdb -ex r --args /mingw32/bin/python2.7 /mingw32/bin/mypaint -c /tmp/freshmypaintconfig
GNU gdb (GDB) 7.9.1
Copyright (C) 2015 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-w64-mingw32".
Type "show configuration" for configuration details.
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<http://www.gnu.org/software/gdb/bugs/>.
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Traceback (most recent call last):
  File "<string>", line 4, in <module>
  File "c:\msys64\mingw32\share\gdb/python/../../gcc-5.2.0/python/libstdcxx/v6/printers.py", line 1267, in register_libstdcxx_printers
    gdb.printing.register_pretty_printer(obj, libstdcxx_printer)
  File "c:\msys64\mingw32\share\gdb/python/gdb/printing.py", line 152, in register_pretty_printer
    printer.name)
RuntimeError: pretty-printer already registered: libstdc++-v6
c:\msys64\mingw32\bin\../etc/gdbinit:6: Error in sourced command file:
Error while executing Python code.
Reading symbols from C:/msys64/mingw32/bin/python2.7...(no debugging symbols found)...done.
Starting program: C:\msys64\mingw32\bin\python2.7.exe C:/msys64/mingw32/bin/mypaint -c C:/msys64/tmp/freshmypaintconfig
[New Thread 3496.0xdac]
warning: Python failed to load the default activation context


Program received signal SIGSEGV, Segmentation fault.
0x64b42ddb in ?? () from C:\msys64\mingw32\bin\libwinpthread-1.dll
(gdb) bt
#0  0x64b42ddb in ?? () from C:\msys64\mingw32\bin\libwinpthread-1.dll
#1  0x6380cbc1 in ?? () from C:\msys64\mingw32\bin\libgomp-1.dll
#2  0x638125a4 in ?? () from C:\msys64\mingw32\bin\libgomp-1.dll
#3  0x6380ecda in ?? () from C:\msys64\mingw32\bin\libgomp-1.dll
#4  0x6380136a in ?? () from C:\msys64\mingw32\bin\libgomp-1.dll
#5  0x63801423 in ?? () from C:\msys64\mingw32\bin\libgomp-1.dll
#6  0x77158d44 in ntdll!RtlQueryEnvironmentVariable ()
   from C:\Windows\SysWOW64\ntdll.dll
#7  0x63800000 in ?? ()
#8  0x7715c26b in ntdll!LdrResSearchResource ()
   from C:\Windows\SysWOW64\ntdll.dll
#9  0x63801400 in ?? () from C:\msys64\mingw32\bin\libgomp-1.dll
#10 0x7715aee1 in ntdll!RtlFormatCurrentUserKeyPath ()
   from C:\Windows\SysWOW64\ntdll.dll
#11 0x7715aff8 in ntdll!LdrLoadDll () from C:\Windows\SysWOW64\ntdll.dll
#12 0x75932ca8 in LoadLibraryExW () from C:\Windows\syswow64\KernelBase.dll
#13 0x75932d05 in LoadLibraryExA () from C:\Windows\syswow64\KernelBase.dll
#14 0x6d101450 in libpython2.7!_PyComplex_FormatAdvanced ()
   from C:\msys64\mingw32\bin\libpython2.7.dll
(gdb) q
A debugging session is active.

        Inferior 1 [process 3496] will be killed.

Quit anyway? (y or n) [answered Y; input not from terminal]