Rawtherapee: Segfault in lmmse demosaic

[heckflosse]

There's a really hard to reproduce segfault in lmmse demosaic.
Searching.....

[Hombre57]

@heckflosse

http://rawpedia.rawtherapee.com/How_to_write_useful_bug_reports

(sorry, couldn't resist :smile: )

[heckflosse]

@Hombre57 If I would be able to reproduce it always, I would have written a better bug report. :smile:

Currently I nailed it down to NaN values produced by lmmse. Still searching

[heckflosse]

Status report:

1) I can reproduce the segfault especially with large files but only in Release builds.
2) When lmmse demosaicing a large file (>= 36 MP) 70 times in a row I get at crash (sometimes on first processing, somtimes on last processing)
3) Changing lmmse working space from [0.f;1.f] range to [0.f;65535.f] range it's absolutely stable

[heckflosse]

Good news:

After upgrading gcc I can't reproduce the issue anymore.
Works fine using

$ gcc --version
gcc.exe (Rev1, Built by MSYS2 project) 8.2.1 20181214