If it helps, the segfault on my system occurs at this instruction (marked '>') in the execution of Perl_mark_stack_grow, called from Perl_sv_clear.

Disassembly of Function perl58.dll!Perl_sv_clear (0x28066647)
  0x2806674E: CALL     0x2805FB9D                         ; SYM:Perl_m
+arkstack_grow
  0x28066753: POP      ECX                                
  0x28066754: MOV      ECX,DWORD PTR [ESI+0x40]           ; <==0x28066
+74B(*-0x9)
  0x28066757: MOV      EAX,EBX                            
  0x28066759: SUB      EAX,DWORD PTR [ESI+0xC]            
  0x2806675C: PUSH     0x96                               
  0x28066764: ADD      EBX,0x4                            
  0x28066767: SAR      EAX,0x2                            
> 0x2806676A: MOV      DWORD PTR [ECX],EAX                
  0x2806676C: MOV      EAX,DWORD PTR [EBP+0x8]            ; ARG:0x8
  0x2806676F: MOV      DWORD PTR [EBX],EAX
[download]

Up to that point the stack is showing

PID: 604 TID: 468 - Stack Contents for 0x2806676A
0x2806676A: perl58.dll:Perl_sv_clear + 0x0123
0x28066D47: perl58.dll:Perl_sv_free + 0x0108
0x28065787: perl58.dll:Perl_sv_force_normal_flags + 0x00AE
0x28060E74: perl58.dll:Perl_leave_scope + 0x0320
0x2805FB9A: perl58.dll:Perl_pop_scope + 0x001C
0x2803F50E: perl58.dll:Perl_sv_compile_2op + 0x5E1A
0x2805F97F: perl58.dll:Perl_runops_standard + 0x000C
0x2808A125: perl58.dll:RunPerl + 0x0086
0x00401012: perl.exe+0x00001012
0x77E814C7: GetCurrentDirectoryW + 0x0044
[download]

which may or may not be useful in tracking down the problem?