https://bugs.winehq.org/show_bug.cgi?id=50142
--- Comment #4 from Paul Gofman pgofman@codeweavers.com --- (In reply to Gijs Vermeulen from comment #3)
As the commit message of 419abd49a1f816e5a869dbf4cc81114cd516138b was "ntdll: Support AVX registers for other thread in Nt{Get|Set}ContextThread()." and my CPU does not support AVX, it may have something to do with the issue. Just a guess.
On which CPU did you test?
Bug #50271 might be related. Could you please try with the patch attached to the bug and if it is still crashing send me ntdll.so binary (https://bugs.winehq.org/show_bug.cgi?id=50271#c17)? In any case, output with WINEDEBUG=warn+seh could be helpful (the full log as suggested in the comment would be better, but not sure if it is easy with interactive winedbg run).