Conference turris::decladebug

910.0. "ladebug dumps core" by NETRIX::"[email protected]" (Miguel Mena) Fri Apr 04 1997 11:40

Hello

a customer (Telekurs Payserv, Switzerland) is experiencing
a problem with decladebug 4.0-14A on Digital UNIX 3.2g.
it dumps core when debugging some of their applications.
I included a logfile of the debugging session at the end
of the note.

The same happens with ladebug 4.0-30 on Digital UNIX 3.2g
and Digital UNIX V4.0b ...

the problem appears only when the application is compiled
with symbol table (cxx -g), without symbol table, ladebug
runs fine, but what's debugging without symbol table ?

the application links in stuff from RTR (librtr.so), RogueWave
Tools H++ and DB Tools (librwtool.so, librwdb.so).

I received part of the source and precompiled binaries for
the reproduction of the problem.

Thanks for your help !

   Miguel


-------------------------------------------------------
Script started on Fri Apr 04 16:26:01 1997
furka:21 > 
furka:21 > 
furka:21 > 
furka:21 > uname -a
OSF1 furka.zuo.dec.com V3.2 62 alpha
furka:22 > 
furka:22 > 
furka:22 > 
furka:22 > setld -i | grep CXX
ATMCXXSHLIB350                  C++ Shared Libraries for Atom (Software
Development)
CXXBASE550      installed       DEC C++ (cxx) for Digital UNIX
CXXBASEA510                     DEC C++ (cxx) for Digital UNIX
CXXLIB550       installed       DEC C++ static class libraries
CXXLIBA510                      DEC C++ static class libraries
CXXMAN550       installed       DEC C++ and class library manual pages
CXXMANA510                      DEC C++ manual pages: cxx, demangler and
library routines
CXXOLDA510                      DEC C++ old packages: oldc89 and ild
CXXSHRDA306                     DEC C++ Class Library, Run-Time Support
CXXSHRDA307     installed       DEC C++ Class Library, Run-Time Support
CXXV3HDR550     installed       DEC C++ header files for Digital UNIX V3.x
furka:23 > 
furka:23 > setld -i | grep LDB
LDBBASE407                      DECladebug Debugger Version 4.0-7
LDBBASE414                      Ladebug Debugger Version 4.0-14A
LDBBASE426                      Ladebug Debugger Version 4.0-26
LDBBASE430      installed       Ladebug Debugger Version 4.0-30
LDBDOC407                       DECladebug Debugger Version 4.0-7 Release
Notes
LDBDOC426                       Ladebug Debugger Version 4.0-26 Release Notes
LDBDOC430       installed       Ladebug Debugger Version 4.0-30 Release Notes
LDBGUI414                       Ladebug Debugger Window Interface
LDBGUI426                       Ladebug Debugger Window Interface
LDBGUI430       installed       Ladebug Debugger Window Interface
LDBSRV426                       Ladebug Debugger remote server
furka:24 > 
furka:24 > 
furka:24 > 
furka:24 > 
furka:24 > ls
Makefile          ladebug.log       libpnutil.a       librwtool.so     
persontest.cxx    pstorcli.h
README            libPBC.a          librefgen.a       libtypes.a       
persontest.v0     pstorrdb.cxx
a.out             libclntsh.so.1.0  librtr.so         mnyrelrt.cxx     
persontest.v1     pstorrdb.h
cxx_repository    libperson.a       librwdb.so        mnyrelrt.h       
persstor.cat      pstorsrv.cxx
include           libpersstor.a.v1  librwora.so       mnyrelvt.cxx     
pstorcli.cxx      pstorsrv.h
furka:25 > 
furka:25 > 
furka:25 > 
furka:25 > 
furka:25 > 
furka:25 > 
furka:25 > 
furka:25 > 
furka:25 > 
furka:25 > ladebug persontest.v0
Welcome to the Ladebug Debugger Version 4.0-30
------------------ 
object file name: persontest.v0 
Reading symbolic information ...Warning: The /proc file system is not mounted,
limited debugging support is provided.
Please mount /proc on your system.

Ladebug Debugger Version 4.0-30 caught signal "Segmentation fault" (11).
This is an unexpected condition and may indicate the presence of a defect.
If you wish to report this, please include the stack trace that follows.
Diagnostic stack trace ...
0x1239db98
0x124d875c
0x124303cc
0x12422688
0x12431e74
0x12430d18
0x124334c8
0x1242f700
0x1242227c
0x12431c28
0x12430d18
0x124334c8
0x1242f700
0x1242227c
0x12431c28
0x12430d18
0x124334c8
0x1242f700
0x124279ac
0x12421fc4
0x1241f2fc
0x1241ed00
0x1241e39c
0x1241d150
0x125329d4
0x12519258
0x12380cf8
0x12380f3c
0x1235b55c
0x122142e8
0x122181b4
0x1235cc40
0x122025e0
0x12204c60
0x121f316c
0x121f02a4
end of diagnostic stack trace.
Could not start process for persontest.v0
No image loaded ... Recovering ... 
(ladebug) quit
Unaligned access pid=13856 <ladebug> va=6f6974636944693b pc=124086bc
ra=124af124 type=ldl
Segmentation fault (core dumped)
furka:26 > file core
core:   core dump, generated from 'persontest.v0'
furka:27 > 
furka:27 > 
furka:27 > 
furka:27 > 
furka:27 > 
furka:27 > ladebug persontest.v1
Welcome to the Ladebug Debugger Version 4.0-30
------------------ 
object file name: persontest.v1 
Reading symbolic information ...Warning: The /proc file system is not mounted,
limited debugging support is provided.
Please mount /proc on your system.
done
(ladebug) 
(ladebug) 
(ladebug) stop in main
[#1: stop in int main(void) ]
(ladebug) stop in ManyRelationRCT<Person,Person>::toStream

Ladebug Debugger Version 4.0-30 caught signal "Segmentation fault" (11).
This is an unexpected condition and may indicate the presence of a defect.
If you wish to report this, please include the stack trace that follows.
Diagnostic stack trace ...
0x1239db98
0x124d875c
0x124303cc
0x12422688
0x12431e74
0x12430d18
0x124334c8
0x1242f700
0x1242227c
0x12431c28
0x12430d18
0x124334c8
0x1242f700
0x124272d8
0x1241f564
0x1241ed00
0x1241e39c
0x1241d150
0x125329d4
0x12519258
0x12380cf8
0x12381160
0x12519974
0x12448f94
0x1244b6a0
0x1244bc54
0x1244b8b4
0x1244bc30
0x1244b8b4
0x1244bc30
0x122ac974
0x122a1d28
0x1229fd90
0x1224ea4c
0x12217a84
0x12203074
0x121f31b4
0x121f02a4
end of diagnostic stack trace.
Fatal error: Segmentation fault
furka:28 > 
furka:28 > cat README
The following binaries cause a segmentation violation in the decladebug
debugger

System: OSF1 leopard V3.2 62 alpha
Cxx:    DEC C++ V5.5-010 on Digital UNIX (Alpha)

  Note: setenv LD_LIBRARY_PATH .


persontest.v0:
        Built in our development tree, compiled all files in library with -g
option
        same libpersstor.a.v1 used as in persontest.v1
        Debugger crashes when reading symbol table

persontest.v1:
        Built locally (with shorter -I paths) , compiled all files in library
with -g option
        Debugger crashes when setting a breakpoint in
ManyRelationRCT<Person,Person>::toStream


furka:28 > 
furka:28 > 
furka:28 > exit
furka:29 > 


script done on Fri Apr 04 16:30:33 1997 

[Posted by WWW Notes gateway]

Miguel,

From the ladebug log, it looks like the /proc file system is not mounted on
your system. 

This may not be the cause of your ladebug's core dump, but you can get
much better debugging support if /proc is mounted. See man page of proc
to get more information.

thanks
shamim

thanks shamim for your reply

the logfile was written during a session on digital unix 3.2g.
the same happens on digital unix 4.0 with /proc mounted.
i can put the customers binaries, source and libs somewhere
you can copy it from. let me know ...

thanks !

  Miguel
[Posted by WWW Notes gateway]

Yes, please send me a pointer to customer binaries, etc.

thanks
shamim

shamim,

find the compresses (gzip) tar file of the source/binary I received
at this location:

ftp://migix.zuo.dec.com/pub/telekurs/telekurs.tar.gz (~10 MBytes)

Thanks !

  Miguel

[Posted by WWW Notes gateway]

Shamim,

I tested it again with the latest ladebug kit (4-35)
on 3.2g and 4.0 and it works !

But :(
the cover letter says, that I'm not allowed to
give it to customers ... :(

Regards,

  Miguel

[Posted by WWW Notes gateway]

If this customer already has ladebug, and this is a serious problem for them,
then go ahead and give it to them with the understanding that this is an
unsupported internal kit.

You should also tell them that there is another internal kit coming out at
the end of April that will have more fixes in it, and that they may want to
wait for that one.

/Bevin

I'll do that.

thanks Shamim, thanks Bevin !

Best regards,

  Miguel


[Posted by WWW Notes gateway]