https://bugs.winehq.org/show_bug.cgi?id=49577
--- Comment #6 from Paul Gofman pgofman@codeweavers.com --- (In reply to Béla Gyebrószki from comment #4)
I've found the culprit: the segfault occurs when STAGING_WRITECOPY is enabled.
Knowing this is very helpful, I could reproduce the crash immediately.
Should be fixed by 26d3815d8c0744a7cdd89370b0c78be5311d0df5