Mail Archives: cygwin/2006/08/05/18:56:57
--- Rob Hatcherson <rob DOT hatcherson AT zedasoft DOT com> wrote:
> All:
>
> After installing 1.5.21-1 (cygcheck output attached) I've starting
> experiencing a DLL loading problem whose presentation is similar to
> that
> of a problem described by Gary Zablackis in a 12-Apr-2006 post with
> subject "Patch for silent crash with Cygwin1.dll v 1.5.19-4".
> Examination of dll_init.cc shows that some variation of the suggested
>
> patch is part of 1.5.21-1.
>
>
> The general situation is that I have a program that depends on
> "B.dll",
> which in turn depends on "A.dll". Both DLLs provide C++ classes.
> The
> symptom is that an attempt to launch the program comes back to the
> shell
> prompt without doing anything, i.e. no error messages, no output, no
> anything else. If I statically link the program then it always
> works.
>
>
> Attempts to run in gdb in the dynamically linked case result in
> output
> similar to this:
>
> Starting program: /cygdrive/c/WorkAreas/...
>
> Program received signal SIGSEGV, Segmentation fault.
> Error: dll starting at 0x4d1000 not found.
>
> Program received signal SIGSEGV, Segmentation fault.
>
> Program received signal SIGSEGV, Segmentation fault.
>
> Program exited with code 030000000005.
> You can't do that without a process to debug.
>
>
> The line "dll starting at 0x4d1000 not found" seemed to suggest that
> I
> have a path issue, but by inspection I don't believe this is the
> case,
> plus if I move the DLLs in question out of the way I get a different
> response from gdb.
>
>
> Google'ing hasn't yielded much yet. The post I referenced above is
> the
> closest thing I've found so far to the symptom I'm seeing.
>
> I've been trying to track this down with gdb, but haven't made much
> progress. I put the cygwin1.dbg from the src distro into the /bin
> dir,
> which at least allowed some level of breakpoint setting, but so far
> none
> of the ones I've tried (dlopen, dll::init(), and a few others in that
>
> vicnity) have been hit. I'm not too familiar with the cygwin source
> base, so I may be snooping around in the wrong spot.
>
> I've also been working on reducing the scenario down to some very
> simple
> libraries that reproduce the symptom reliably, but this hasn't
> yielded
> anything worth reporting yet.
>
>
> In the meantime, does anyone have any suggestions regarding what's
> going
> on, and/or some other technique to catch this problem?
>
> Rob
>
=== message truncated ===> --
I had a similar problem with dynamically loaded modules (extensions) in
TCL. I traced my problem to the upgrade of binutils 20050610-1 to
binutils 20060709-1. When I rolled it back, everthing was fine.
However, I'm still running 1.5.20-1.
Hope this helps,
Martin
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