[GRASS-dev] Heisenbug in v.out.ascii with column parameter: segfault

[Markus Neteler]

Here we are:

GRASS 6.4.0svn (patUTM32):~ > valgrind --tool=memcheck v.out.ascii
phd_area_main_cities column=name
==26104== Memcheck, a memory error detector.
==26104== Copyright (C) 2002-2007, and GNU GPL'd, by Julian Seward et al.
==26104== Using LibVEX rev 1854, a library for dynamic binary translation.
==26104== Copyright (C) 2004-2007, and GNU GPL'd, by OpenWorks LLP.
==26104== Using valgrind-3.3.1, a dynamic binary instrumentation framework.
==26104== Copyright (C) 2000-2007, and GNU GPL'd, by Julian Seward et al.
==26104== For more details, rerun with: -v
==26104==
==26104== Conditional jump or move depends on uninitialised value(s)
==26104==    at 0x4E4F408: db_enlarge_string (in
/home/neteler/binaries/grass-6.4.0svn/lib/libgrass_dbmibase.6.4.0svn.so)
==26104==    by 0x4E4F50C: set_string (in
/home/neteler/binaries/grass-6.4.0svn/lib/libgrass_dbmibase.6.4.0svn.so)
==26104==    by 0x4E4FD39: db_copy_value (in
/home/neteler/binaries/grass-6.4.0svn/lib/libgrass_dbmibase.6.4.0svn.so)
==26104==    by 0x54DC58D: db_select_value (in
/home/neteler/binaries/grass-6.4.0svn/lib/libgrass_dbmiclient.6.4.0svn.so)
==26104==    by 0x40210E: bin_to_asc (in
/home/neteler/binaries/grass-6.4.0svn/bin/v.out.ascii)
==26104==    by 0x402A79: main (in
/home/neteler/binaries/grass-6.4.0svn/bin/v.out.ascii)
==26104==
==26104== Conditional jump or move depends on uninitialised value(s)
==26104==    at 0x4E4F417: db_enlarge_string (in
/home/neteler/binaries/grass-6.4.0svn/lib/libgrass_dbmibase.6.4.0svn.so)
==26104==    by 0x4E4F50C: set_string (in
/home/neteler/binaries/grass-6.4.0svn/lib/libgrass_dbmibase.6.4.0svn.so)
==26104==    by 0x4E4FD39: db_copy_value (in
/home/neteler/binaries/grass-6.4.0svn/lib/libgrass_dbmibase.6.4.0svn.so)
==26104==    by 0x54DC58D: db_select_value (in
/home/neteler/binaries/grass-6.4.0svn/lib/libgrass_dbmiclient.6.4.0svn.so)
==26104==    by 0x40210E: bin_to_asc (in
/home/neteler/binaries/grass-6.4.0svn/bin/v.out.ascii)
==26104==    by 0x402A79: main (in
/home/neteler/binaries/grass-6.4.0svn/bin/v.out.ascii)
664070.15136424|5103723.69345589|1|Trento
680631.89931785|5152080.37972013|2|Bolzano - Bozen
748566.88848245|5114436.80436153|3|Belluno
753217.48877466|5062320.47156408|4|Treviso
783478.0559796|5095956.26859946|5|Pordenone
==26104==
==26104== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 5 from 1)
==26104== malloc/free: in use at exit: 20,632 bytes in 186 blocks.
==26104== malloc/free: 495 allocs, 309 frees, 46,512 bytes allocated.
==26104== For counts of detected errors, rerun with: -v
==26104== searching for pointers to 186 not-freed blocks.
==26104== checked 779,376 bytes.
==26104==
==26104== LEAK SUMMARY:
==26104==    definitely lost: 13,863 bytes in 103 blocks.
==26104==      possibly lost: 0 bytes in 0 blocks.
==26104==    still reachable: 6,769 bytes in 83 blocks.
==26104==         suppressed: 0 bytes in 0 blocks.
==26104== Rerun with --leak-check=full to see details of leaked memory.

Doesn't tell me too much... :( I guess an extra trick is needed to include
DBMI checking.

Markus

On Wed, Sep 9, 2009 at 12:14 PM, Soeren
Gebbert<soerengebbert at googlemail.com> wrote:
> Hello,
> try valgrind:
>
> valgrind --tool=memcheck v.out.ascii phd_area_main_cities column=name
>
> Sören
>
> 2009/9/9 Markus Neteler <neteler at osgeo.org>
>>
>> Hi,
>>
>> I get a Heisenbug [1] when exporting points from v.out.ascii with
>> attributes
>> (Scientific Linux, 64bit):
>>
>> GRASS 6.4.0svn (patUTM32):~ > v.out.ascii phd_area_main_cities column=name
>> Segmentation fault
>>
>> GRASS 6.4.0svn (patUTM32):~ > gdb v.out.ascii
>> GNU gdb Red Hat Linux (6.5-37.el5_2.2rh)
>> ...
>> This GDB was configured as "x86_64-redhat-linux-gnu"...(no debugging
>> symbols found)
>> Using host libthread_db library "/lib64/libthread_db.so.1".
>>
>> (gdb) r phd_area_main_cities column=name
>> Starting program:
>> /home/neteler/binaries/grass-6.4.0svn/bin/v.out.ascii
>> phd_area_main_cities column=name
>> (no debugging symbols found)
>> ...
>> (no debugging symbols found)
>> [Thread debugging using libthread_db enabled]
>> [New Thread 47548720613104 (LWP 7517)]
>> (no debugging symbols found)
>> [Detaching after fork from child process 7520. (Try `set detach-on-fork
>> off'.)]
>> 664070.15136424|5103723.69345589|1|Trento
>> 680631.89931785|5152080.37972013|2|Bolzano - Bozen
>> 748566.88848245|5114436.80436153|3|Belluno
>> 753217.48877466|5062320.47156408|4|Treviso
>> 783478.0559796|5095956.26859946|5|Pordenone
>> Program exited normally.
>>
>> GRASS 6.4.0svn (patUTM32):~ > v.out.ascii phd_area_main_cities column=name
>> Segmentation fault
>>
>> Yes, I didn't compile with -g because it is my production machine but
>> since it works in GDB...
>>
>> Any idea how to debug this problem?
>>
>> thanks
>> Markus
>>
>> [1] http://en.wikipedia.org/wiki/Unusual_software_bug#Heisenbug
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>
>