https://bugs.winehq.org/show_bug.cgi?id=45355
--- Comment #5 from Ulrich Gemkow ulrich.gemkow@ikr.uni-stuttgart.de --- (In reply to Fabian Maurer from comment #4)
Sent in a patch to fix the issue: https://source.winehq.org/patches/data/147632
It shouldn't be a big deal, it's just a lock that in some (seemingly rare) code path wasn't released properly.
Thanks, great! Confirming that the patch fixes the problem for me.