Hi!
>  I'm trying to use librrd from a C main program. Execution fails sometimes when calling to rrd_graph(). The output of the debugger "Valgrind" is:
>     
>       ==31745==  Invalid read of size 2
>      ==31745==     at 0x40CEBA3: getenv (in /lib/tls/libc-2.3.6.so)
>      ==31745==    by 0x4125690: (within /lib/tls/libc-2.3.6.so)
>      ==31745==    by 0x412635D: tzset (in /lib/tls/libc-2.3.6.so)
>      ==31745==    by 0x402FD19: rrd_graph_init (rrd_graph.c:2875)
>      ==31745==    by 0x40355AC: rrd_graph (rrd_graph.c:2801)
>      ==31745==    by 0x8049B6C: main (in/home/sole/proyecto/erlang/lib/rrdtool_app-1.0/priv/ExtProg)
>      ==31745==  Address 0x4115006B is not stack'd, malloc'd or (recently) free'd
>      ==31745==
>      ==31745==  Process terminating with default action of  signal 11 (SIGSEGV)
>     
>   Could you help me to solve this problem?
Sure. But could you sent us the output of a _debugger_ instead of a
memory checker? Does the program crash with SIGSEGV if you run it outside of valgrind?

Compile your program with debug options.
Set your coresize to unlimited, run your program - it caught a SIGSEGV so
a core dump will be generated. Run gdb <your program> core and send
the output of backtrace and backtrace full

This makes debugging easier.

HTH,

Andreas.

-- 
Dipl.-Ing. Andreas Maus             science+computing ag
System Administration               Hagellocher Weg 71-75
mail: a.maus@science-computing.de   72070 Tuebingen, Germany
tel.: +49 7071 9457 456             www.science-computing.de

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