[Bug 54482] New: RtlCaptureStackBackTrace cause segv

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54482

Bug ID: 54482
           Summary: RtlCaptureStackBackTrace cause segv
           Product: Wine
           Version: 8.1
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ntdll
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 74033
  --> https://bugs.winehq.org/attachment.cgi?id=74033
patch attempt

RtlCaptureStackBackTrace crash on segmentation fault because the unwinding
keeps going beyond the stack end. It seems on x86-64 the stack actually starts
at least 32 bytes below StackBase so the compariston with context.rsp to
StackBase will never hit but we get a context.rpc value of 0 which obviously
SEGV:s.

I made a patch attempt and just check if rcp = 0 and end the unwinding.