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Date: Sat, 28 Jul 2007 20:19:04 -0700
From: Linda Walsh <cygwin AT tlinx DOT org>
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To: cygwin AT cygwin DOT com
CC: Reini Urban <rurban AT x-ray DOT at>
Subject: Re: perl5.8.8 SEGfault and corrupt stack
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Reini,

Reini Urban wrote:
> Linda Walsh schrieb:
>>  I'm having problems with perl5.8.8.  I tried running it under gdb, but
>> it won't load:
>>  > gdb perl.exe
>> GNU gdb 6.3.50_2004-12-28-cvs (cygwin-special)
>> (gdb) run
>> Starting program: /usr/bin/perl.exe
>> Program received signal SIGSEGV, Segmentation fault.
>> 0x610b48b6 in pthread_key_create () from /usr/bin/cygwin1.dll
> 
> Cannot reproduce. Is this a fresh re-install without site_perl or with 
> your broken setup as stated in perl5-porters?
---
	My "broken setup" was caused by trying to upgrade to 5.8.8 from 5.8.7.
I ran into incompatibilities and decided to re-install & update the modules from
scratch.  I 1st removed "site_perl" then installed 5.8.8.  I then used
the CPAN to upgrade itself then the new "update" command to bring my
module list back to current.  After some manual installs to get around
cygwin-specific ".dll" replacement issues, I'm only left with "Image::Magick"
that won't update.  Fails with many errors, starting with bad compiler options.
	Calling my "setup" broken after I detailed on p5p steps to fix it
seems unnecessarily confrontational, but this is the cygwin list....1/2 :-)

You wrote:
> $ gdb perl.exe
> (gdb) run -e'print 1'
> GNU gdb 6.5.50.20060706-cvs (cygwin-special) 
> This GDB was configured as "i686-pc-cygwin"...Minimal symbols from perl.exe... 
> (no debugging symbols found)
> Starting program: /usr/bin/perl.exe -e'print 1'
> Loaded symbols for /cygdrive/c/WINDOWS/system32/ntdll.dll
> Loaded symbols for /cygdrive/c/WINDOWS/system32/kernel32.dll
> Loaded symbols for /bin/cygwin1.dll
> Loaded symbols for /cygdrive/c/WINDOWS/system32/advapi32.dll
> Loaded symbols for /cygdrive/c/WINDOWS/system32/rpcrt4.dll
> Loaded symbols for /bin/cygperl5_8.dll
> Loaded symbols for /bin/cygcrypt-0.dll
----
	At least I know what it is "supposed" to look like. What I see instead is:
 > gdb perl
GNU gdb 6.3.50_2004-12-28-cvs (cygwin-special)
This GDB was configured as "i686-pc-cygwin"...Minimal symbols from perl.exe...
(no debugging symbols found)
(gdb) run -e'print 1'
Starting program: /usr/bin/perl.exe -e'print 1'
Program received signal SIGSEGV, Segmentation fault.
0x610b48b6 in pthread_key_create () from /usr/bin/cygwin1.dll
(gdb)

>> I also tried profiling a perl file:
>> law/perl> perl -d:DProf show.pl -s
>>      8 [main] perl 3192 _cygtls::handle_exceptions: Error while 
>> dumping state (probably corrupted stack)
>> Segmentation fault (core dumped)
---
As you noted in your next note, this 2nd problem seems(?) to be duplicable
outside of cygwin.
>>
>> Any ideas on causes...fixes?...
> 
> I would try a rebaseall
---
	Good suggestion.  Hadn't thought of that.  Unfortunately
rebaseall fails as well:
 > rebaseall
ReBaseImage (/usr/bin/cygiconv-2.dll) failed with last error = 6

Any other ideas?  I tried checking the rebaseall & rebase manpages, but
couldn't find anything referencing "error = 6" (no manpages for either).

When does rebase/rebaseall fail with an error=6?

Thanks,
Linda





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