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Date: Fri, 16 Oct 2009 15:46:18 -0400
From: Charles Wilson <cygwin AT cwilson DOT fastmail DOT fm>
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To: cygwin AT cygwin DOT com
Subject: Re: fork failure?
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Dave Korn wrote:
> Charles Wilson wrote:
>> Help?
> 
>   Trashed stack?
> 
>> I note that procmon indicates that the child process exited with code
>> -1073741783, which in hex is 0xc0000029.  If that's an NTSTATUS value,
>> then it means STATUS_INVALID_UNWIND_TARGET, but that might be a red herring.
> 
>   Trashed stack during SEH unwind?
> 
>   Might be able to get some useful info by running this under windbg and
> intercepting the exception; even just an $eip to tell you where it's coming
> from might be all the clue you needed.

*** wait with pending attach
Symbol search path is:
srv*c:\Temp\websymbols*http://msdl.microsoft.com/download/symbols
Executable search path is:
ModLoad: 00400000 00998000   c:\cygwin-1.7\bin\gpg-agent.exe
ModLoad: 770e0000 77207000   C:\Windows\system32\ntdll.dll
ModLoad: 77000000 770db000   C:\Windows\system32\kernel32.dll
ModLoad: 67f00000 67f0f000   c:\cygwin-1.7\bin\cyggcc_s-1.dll
ModLoad: 61000000 61300000   c:\cygwin-1.7\bin\cygwin1.dll
ModLoad: 760a0000 76166000   C:\Windows\system32\ADVAPI32.DLL
ModLoad: 75960000 75a22000   C:\Windows\system32\RPCRT4.dll
ModLoad: 684a0000 6850d000   c:\cygwin-1.7\bin\cyggcrypt-11.dll
ModLoad: 71950000 71958000   c:\cygwin-1.7\bin\cyggpg-error-0.dll
ModLoad: 6a960000 6a96d000   c:\cygwin-1.7\bin\cygintl-8.dll
ModLoad: 6ca10000 6cb0a000   c:\cygwin-1.7\bin\cygiconv-2.dll
ModLoad: 76290000 7632d000   C:\Windows\system32\USER32.dll
ModLoad: 76050000 7609b000   C:\Windows\system32\GDI32.dll
ModLoad: 6fa40000 6fa54000   c:\cygwin-1.7\bin\cygpth-20.dll
ModLoad: 76170000 7618e000   C:\Windows\system32\IMM32.DLL
ModLoad: 76190000 76258000   C:\Windows\system32\MSCTF.dll
ModLoad: 75bd0000 75c7a000   C:\Windows\system32\msvcrt.dll
ModLoad: 76330000 76339000   C:\Windows\system32\LPK.DLL
ModLoad: 75de0000 75e5d000   C:\Windows\system32\USP10.dll
ModLoad: 6c1b0000 6c1b5000   C:\Windows\system32\avgrsstx.dll
(f78.1938): Break instruction exception - code 80000003 (first chance)
eax=7ffdc000 ebx=00000000 ecx=00000000 edx=7716d094 esi=00000000
edi=00000000
eip=77127dfe esp=1a49ff5c ebp=1a49ff88 iopl=0         nv up ei pl zr na
pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000
efl=00000246
ntdll!DbgBreakPoint:
77127dfe cc              int     3
0:002> g
(f78.1118): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=00000000 ebx=0136cab8 ecx=00000000 edx=ffffffff esi=00000007
edi=00404119
eip=00000000 esp=7ff8f6fc ebp=7ff8f984 iopl=0         nv up ei pl zr na
pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000
efl=00010246
00000000 ??              ???
0:000> k
ChildEBP RetAddr
WARNING: Frame IP not in any known module. Following frames may be wrong.
7ff8f984 00000000 0x0


which is just after the output window gets:
returning from fork: ischild=1, res=0

So, this is the right spot.  And $eip is 0x0.  That doesn't tell me much...

Something is obviously going badly wrong in the guts of fork(). Unless
somebody has a brilliant idea, I'm going to mothball this until after
cgf (Ye Olde Forke Experte) returns.

--
Chuck

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