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Date: Thu, 15 Oct 2009 19:33:09 -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:
>> I'm not familiar at all with procmon (sysinternals, right?) but I'll
>> look into it.
> 
>   Yep, it's dead useful for making sure that stuff at least starts up, and you
> can often get a clue how far the code has got by seeing what handles it's
> opened and syscalls its made.

Well, it appears that the child is dying in dcrt0.c dll_crt0_1() when it
calls cygheap->cwd.init().  The line numbers below are a little messed
up (I need to build with -O0 to get more info), but here are the last
four interesting events from the child...with the top few frames of the
stack trace for each, manually converted using addr2line...



43673	6:58:17.3634216 PM	gpg-agent.exe	568	CreateFile	C:\cygwin-1.7
SUCCESS	Desired Access: Execute/Traverse, Synchronize, Disposition:
Open, Options: Directory, Synchronous IO Non-Alert, Attributes: n/a,
ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened	7628

	"12","ntdll.dll","ntdll.dll + 0x587f4",	"0x771387f4",
	"13","cygwin1.dll","cygwin1.dll + 0x89fe8","0x61089fe8"
		path.cc:3225
		cwdstuff::set(_UNICODE_STRING*, char const*, bool)
	"14","cygwin1.dll","cygwin1.dll + 0x8a4d8","0x6108a4d8",
		path.cc:3168
		cwdstuff::init()
	"15","cygwin1.dll","cygwin1.dll + 0x6722","0x61006722",
		dcrt0.c:798
		dll_crt0_1()

43674	6:58:17.3634756 PM	gpg-agent.exe	568	CloseFile	C:\cygwin-1.7
SUCCESS		7628

	"11","ntdll.dll","ntdll.dll + 0x57f54","0x77137f54",
	"12","cygwin1.dll","cygwin1.dll + 0x8a003","0x6108a003",
		path.cc:3241
		cwdstuff::set(_UNICODE_STRING*, char const*, bool)
	"13","cygwin1.dll","cygwin1.dll + 0x8a4d8","0x6108a4d8",
		path.cc:3168
		cwdstuff::init()
	"14","cygwin1.dll","cygwin1.dll + 0x6722","0x61006722",
		dcrt0.c:798
		dll_crt0_1()


NOTE: next entry is from thread 2228, not 7628
53626	6:58:19.0002272 PM	gpg-agent.exe	568	Thread Exit		SUCCESS	User
Time: 0.0000000, Kernel Time: 0.0000000	2228
	
	"5","kernel32.dll","kernel32.dll + 0x4046b","0x7704046b",
	"6","cygwin1.dll","cygwin1.dll + 0xbabf5","0x610babf5",
		sigproc.cc:1191
		wait_sig(void*)
	"7","cygwin1.dll","cygwin1.dll + 0x3fec","0x61003fec",
		cygthread.cc:50
		cygthread::callfunc(bool)

53627	6:58:19.0005306 PM	gpg-agent.exe	568	Thread Exit		SUCCESS	User
Time: 0.0000000, Kernel Time: 0.0156001	7628

	"7","ntkrnlpa.exe","ntkrnlpa.exe + 0x57a1a","0x820a3a1a"
	"8","ntdll.dll","ntdll.dll + 0x80e35","0x77160e35",

So it looks to me like something in cwdstuff::init() triggered a signal,
which was caught by cygwin and handled by aborting.

Does that analysis look right?  If so, then I guess I need to rebuild
the DLL with --enable-debugging and -O0, so I can find out exactly WHY
that's happening.

--
Chuck

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