[lmi] Segfault in lmi with wxWidgets-2009-03-10

[Greg Chicares]

To reproduce, with luck:
  start lmi
  open any file of any type, and leave its window open
  close lmi (forcing the open MDI child window to be closed)
Crash report from 'Dr. MinGW' JIT debugger below [0], FWIW. It says:
  lmi_wx_shared.exe caused an Access Violation at location 10319acb \
  in module wxmsw290u_gcc_344-20090310T1057Z.dll Reading from location 00000054.
and another run gives:
  lmi_wx_shared.exe caused an Access Violation at location 00000000 \
  Reading from location 00000000.
while yet another gives:
  lmi_wx_shared.exe caused an Access Violation at location 40180000 \
  Reading from location 40180000.

'addr2line' doesn't seem to shed much light:

$/MinGW_/bin/addr2line -if -e 
/opt/lmi/local/lib/wxmsw290u_gcc_344-20090310T1057Z.dll 0x010319acb
_onexit
d:/src/mingw/build/runtime/../../runtime/dllcrt1.c:183

[I guess the mingw-runtime maintainer used "d:" on his build machine.]

'dllcrt1.c' is here:
  
http://cygwin.com/cgi-bin/cvsweb.cgi/src/winsup/mingw/dllcrt1.c?annotate=1.4&cvsroot=src
and I'm guessing that it's the onexit() function in the MinGW-built
wx dll I'm using, though I don't know what that might really indicate.

I'm unable to reproduce the problem when I run lmi under gdb. IIRC, gdb
does some zero-initialization that can mask stray-pointer problems.

If I uninstall 'Dr. MinGW', lmi still crashes.

I did not observe this problem with wxWidgets-2009-03-08. That's not
conclusive proof of anything, but it seems to suggest that something
that changed in wx between the 2009-03-08 and 2009-03-10 snapshots
might contribute to this segfault. A cockpit error here is always
conceivable; I'll 'rm' my lmi build directory and rebuild from
scratch in an attempt to rule that out.

What else should I try?

---------

[0] "Crash report from 'Dr. MinGW' JIT debugger"

lmi_wx_shared.exe caused an Access Violation at location 10319acb in module 
wxmsw290u_gcc_344-20090310T1057Z.dll Reading from location 00000054.

Registers:
eax=03374ce0 ebx=03468b68 ecx=03478e38 edx=00000000 esi=03468b40 edi=0051511c
eip=10319acb esp=0022ec50 ebp=0022eca8 iopl=0         nv up ei pl zr na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000246

Call stack:
AddrPC     AddrReturn AddrFrame  AddrStack  Params
10319ACB   00482CA9   0022ECA8   0022EC50   03478E38   03429C40   0347F800   
03468B68
10319ACB  wxmsw290u_gcc_344-20090310T1057Z.dll:10319ACB  _onexit  dllcrt1.c:183
_onexit_t _onexit(
        _onexit_t pfn = 
&C:\opt\lmi\local\lib\wxmsw290u_gcc_344-20090310T1057Z.dll: No symbol found
0x03478e38
[...snip many lines similar to that]
77D67AD7   77D6CCD4   0022F3F4   0022EC50   10206130   17750BFA   00000010   
00000000
77D67AD7  USER32.dll:77D67AD7  SetWindowPlacement
77D6CCD4   77D445BD   0022F45C   0022EC50   00000000   10206130   17750BFA   
00000010
77D6CCD4  USER32.dll:77D6CCD4  DefRawInputProc
77D445BD   77D447D4   0022F4B0   0022EC50   0301E138   00000010   00000000   
00000000
77D445BD  USER32.dll:77D445BD  TranslateMessageEx
77D447D4   77F75DA3   0022F4D8   0022EC50   0022F4E8   00000018   0301E138   
00000010
77D447D4  USER32.dll:77D447D4  DefWindowProcA
77F75DA3   77D5B339   0022F550   0022EC50   17750BFA   00000112   0000F060   
00000000
77F75DA3  ntdll.dll:77F75DA3  KiUserCallbackDispatcher
77D5B339   77D7E913   0022F5B8   0022EC50   17750BFA   0BB10B18   00000112   
0000F060
77D5B339  USER32.dll:77D5B339  CreateDialogIndirectParamAorW
77D7E913   1026FAF2   0022F5D8   0022EC50   17750BFA   0BB10B18   00000112   
0000F060
77D7E913  USER32.dll:77D7E913  DefFrameProcW
1026FAF2   1020F91C   0022F5F8   0022EC50   03462880   00000112   0000F060   
00000000
[...snip many "No symbol found" lines]
77D67AD7   77D6CCD4   0022FAF4   0022EC50   10206130   17750BFA   00000112   
0000F060
77D67AD7  USER32.dll:77D67AD7  SetWindowPlacement
77D6CCD4   77D44455   0022FB5C   0022EC50   00000000   10206130   17750BFA   
00000112
77D6CCD4  USER32.dll:77D6CCD4  DefRawInputProc
77D44455   77D495D5   0022FBBC   0022EC50   0022FC00   00000000   1016CC15   
0022FC00
77D44455  USER32.dll:77D44455  TranslateMessageEx
77D495D5   1016CC5C   0022FBE8   0022EC50   0344A348   0022FC00   00000000   
00000000
77D495D5  USER32.dll:77D495D5  DispatchMessageW
1016CC5C   1003471A   0022FC28   0022EC50   0344A348   0022FAE0   0022FB94   
00000040
[...snip many "No symbol found" lines]