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Date: Thu, 25 Jan 2007 12:33:18 -0500 (EST)
From: Igor Peshansky <pechtcha AT cs DOT nyu DOT edu>
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Subject: Re: gdb coredumps on any executable
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On Mon, 22 Jan 2007, Igor Peshansky wrote:

> On a fresh install of Cygwin, running gdb with any executable produces a
> stackdump from gdb.  Here's a sample session:
>
> $ gdb /bin/test
> GNU gdb 6.5.50.20060706-cvs (cygwin-special)
> Copyright (C) 2006 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i686-pc-cygwin"...(no debugging symbols found)
>
> (gdb) run
> Starting program: /bin/test.exe
> Loaded symbols for /cygdrive/c/WINDOWS/system32/ntdll.dll
> Loaded symbols for /cygdrive/c/WINDOWS/system32/kernel32.dll
> Loaded symbols for /usr/bin/cygwin1.dll
> Loaded symbols for /cygdrive/c/WINDOWS/system32/advapi32.dll
> Loaded symbols for /cygdrive/c/WINDOWS/system32/rpcrt4.dll
> Loaded symbols for /usr/bin/cygintl-8.dll
> Loaded symbols for /usr/bin/cygiconv-2.dll
> Segmentation fault (core dumped)
> $ cat gdb.exe.stackdump
> Exception: STATUS_ACCESS_VIOLATION at eip=0054FF55
> eax=00000000 ebx=00000000 ecx=0000006B edx=0000002F esi=00000000 edi=10259B30
> ebp=0022C148 esp=0022C0C0 program=C:\cygwin\bin\gdb.exe, pid 4296, thread main
> cs=001B ds=0023 es=0023 fs=003B gs=0000 ss=0023
> Stack trace:
> Frame     Function  Args
> 0022C148  0054FF55  (00000000, 006162AA, 00000008, 0022C17C)
> 0022C518  00461BE0  (00000001, 00000000, 00000000, 0000C6B0)
> 0022C648  00461F10  (00000000, 00000000, 10113C98, 00000000)
> 0022C698  00411C6B  (00461EB0, 00000000, 00616290, 00000006)
> 0022C738  00463A77  (0022C7A0, FFFFFFFF, 00000000, 00000000)
> 0022C808  004271A5  (00000000, 00000000, 00000000, 0000C6B0)
> 0022C868  00427335  (FFFFFFFF, 00000000, 00000000, 00000001)
> 0022C898  00412232  (00000000, 00000001, 00000001, 00000000)
> 0022C8D8  004023C7  (100B0393, 00000001, 0022C918, 100ED570)
> 0022C918  00421C84  (100B0390, 100FB738, 0022C930, 00000000)
> 0022C948  0042221B  (100ED570, 00000000, 00696ED4, 0000000C)
> 0022C968  005430E5  (0048E6D0, 00000002, 0022C998, 0048E76A)
> 0022C978  004215FB  (00000000, 00000000, 00000000, 0022C900)
> 0022C998  0048E76A  (00000000, 00000000, 0022C9B8, 0048E145)
> 0022C9B8  0048E1D2  (100E5440, 00000002, FFFFFFFF, 0022C9D8)
> 0022C9F8  0048EA95  (00000000, 00000000, 100FB718, 00000000)
> End of stack trace (more stack frames may be present)
> $
>
> I don't have the debugging symbols for gdb, and am unable to build one
> right now, but all of the addresses seem to be in the application space.
> The output of "cygcheck -svr" is attached.
>
> I vaguely recall such issues being redirected to the insight list, but I
> suspect this is a Cygwin problem, not a gdb one...
>
> I can build my own Cygwin, but without a working gdb it would be hard to
> debug this problem.  Any ideas?
> 	Igor

Ping.  Did this get overlooked?  Can people at least confirm that this
works for them on the same setup, so I can start looking for a problem in
my local installation?
Thanks,
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
      |\      _,,,---,,_	    pechtcha AT cs DOT nyu DOT edu | igor AT watson DOT ibm DOT com
ZZZzz /,`.-'`'    -.  ;-;;,_		Igor Peshansky, Ph.D. (name changed!)
     |,4-  ) )-,_. ,\ (  `'-'		old name: Igor Pechtchanski
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

Freedom is just another word for "nothing left to lose"...  -- Janis Joplin

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