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Re: fork failure?
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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