RE: Repeatable crash with CVS version of cygwin1 DLL

["Cliff Geschke" <cliff_pa at geschkefamily dot com>]

I have tried the latest update from CVS.  Still crashes, but stackptr does not
go out-of-bounds.  At some point, _sigbe tries to ret with the top of stack
($esp) value set to 0.

Some additional data points:

1. I moved the test .exe file to a Win2000 box running an old cygwin1.dll (file
version 1005.5.0.0, product version 1.5.5-cr-0x9b).  No crash.  The test seems
to run fine.

2. I moved the new 1.5.8 cygwin1.dll back to that Win2000 box.  Test crashes.

It is not feasible for me to put together a simple test program, unless you want
load and build RTEMS so you can link to it.

If you trust me, I can push you the test .exe file.  I can uuencode it to
probably get past your filters.  But that seems like a poor thing to post to
this list.  Do you want me to email it or push it somewhere else?

Please advise.

Cliff Geschke

-----Original Message-----
From: Christopher Faylor [mailto:cgf-no-personal-reply-please@cygwin.com] 
Sent: Wednesday, February 18, 2004 4:43 PM
Subject: Re: Repeatable crash with CVS version of cygwin1 DLL

On Wed, Feb 18, 2004 at 10:31:03AM -0600, Cliff Geschke wrote:
>cygwin-1.5.7-1
>cygwin-SPLAT-cygwin-BOP-com

Please, avoid putting raw email addresses in messages.  They serve no purpose
and are spambot fodder.

>After doing what you asked, the crash still occurs, but is somewhat 
>different.  Here is what I did.
>
>1. Loaded cygwin from CVS.  I see the relevant routines have all changed.
>2. ./configure
>3. make
>4. build failed for dumper.exe (will send separate email) 5. Replaced  
>/usr/bin/cygwin1.dll with new-cygwin1.dll 6. Reboot (just to be safe) 
>7. Ran my test program.
>
>I am still seeing stackptr being corrupted.  I believe it happens after 
>a setjmp/longjump.  See "do_jump" routine below.
>
>I think the problem is in the "call _set_process_mask" in sigreturn.
>That somehow winds up calling _sigbe with the thread stack empty.
>
>Look for "####" below for start of debug sections.
>
>I can supply the .exe test program if you wish.
>
>Good luck and thanks,

Thank you for providing an impressive amount of detail.  I have made some
changes to setjmp/longjmp.  I don't know if they fix your problems but I did
manage to write a very simple test case which illustrated a problem with using
setjmp/longjmp in signal handlers.





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