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Originally Posted by freemangordon

@avidscavenger - install qt -dbg packages and get some useful backtrace .

Originally Posted by avidscavenger

Thanks.

Unfortunately doesn't really tell me what I didn't already know. Two valid stack frames then nothing but question marks. Some buffer over- or under-run has destroyed the stack? Any suggestions?

Note that turning off compiler optimisation makes the problem go away. And valgrind didn't find anything.

Not too sure where to go from here.

Originally Posted by freemangordon

You are missing debug symbols for /usr/lib/libQtCore.so.4, that is why gdb says "Backtrace stopped: previous frame identical to this frame (corrupt stack?)". Just install libqt4-core-dbg and you'll see. I can't say it clearer than that

Originally Posted by handaxe

[OT] @avidscavenger: southern hemisphere + good command of English: OZ, NZ, SA?

HA (ex SA)

Originally Posted by avidscavenger

If you consider Australian English to be good English

Originally Posted by avidscavenger

That is what I did.

Here is some output:

Code:

user@Nokia-N900:~/MyDocs/core-dumps/columbus-3E77-11-2005$ dpkg -l libqt4-core-dbg
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Cfg-files/Unpacked/Failed-cfg/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name                  Version               Description
+++-=====================-=====================-==========================================================
ii  libqt4-core-dbg       1:4.7.4~git20110505+c Qt 4 library debugging symbols
user@Nokia-N900:~/MyDocs/core-dumps/columbus-3E77-11-2005$ gdb /opt/usr/bin/columbus ./coredump
GNU gdb (GDB) 6.8.50.20090417-debian
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "arm-linux-gnueabi".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
(no debugging symbols found)
Reading symbols from /opt/usr/lib/librxsupport.so.1...(no debugging symbols found)...done.
Loaded symbols for /opt/usr/lib/librxsupport.so.1
Reading symbols from /opt/usr/lib/libcolumbus.so.1...(no debugging symbols found)...done.

<snip>

Code:

Reading symbols from /usr/lib/libQtCore.so.4...Reading symbols from /opt/usr/lib/debug/usr/lib/libQtCore.so.4.7.4...done.
done.
Loaded symbols for /usr/lib/libQtCore.so.4

<snip>

Code:

Core was generated by `/opt/usr/bin/columbus'.
Program terminated with signal 11, Segmentation fault.
#0  QString::fromLatin1_helper (str=0x73 <Address 0x73 out of bounds>, size=-1) at tools/qstring.cpp:3743
3743    tools/qstring.cpp: No such file or directory.
        in tools/qstring.cpp
(gdb) bt
#0  QString::fromLatin1_helper (str=0x73 <Address 0x73 out of bounds>, size=-1) at tools/qstring.cpp:3743
#1  0x40e7910c in QString::fromAscii_helper (str=0x73 <Address 0x73 out of bounds>, size=1088917772)
    at tools/qstring.cpp:3809
#2  0x00015ad0 in ?? ()
#3  0x00015ad0 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
Current language:  auto; currently c++
(gdb)

As you can see, we get a bit more information about the line numbers and variable names, but nothing more on the stack.

Originally Posted by freemangordon

BTW I am on #maemo IRC @ freenode.net, better join there to speedup the communication.