[rrd-developers] segfault in rrdtool-1.0.40

[Carter Bullard]

Gentle people,
   I am having problems graphing from a valid rrd file,
and I'm getting seg faults at line 304 in rrd_fetch.c.

I have found that I can get the same fault trying to graph
an empty rrd file with a subset of my parameters.  These
two commands generate the segfault everytime.

./rrdtool create /tmp/test.rrd -b 1036472400 --step 21600
DS:object0:GAUGE:21600:U:U RRA:AVERAGE:0.5:1:100000

./rrdtool graph ragraph.gif --base 1000 --start 1036472400 --end
1036558800 DEF:alphaIn0=/tmp/temp.rrd:objectIn0:AVERAGE
CDEF:ralphaIn0=alphaIn0,21600,/

This is a little beyond my expertise so I would really appreciate
if anyone can take a look at the problem.


With debugging turned on, I get this output trying to graph
my actual data:

rra_start 3171443296, rra_end 1036454400, start_off -98842, end_off -5
First Seek: rra_base 540 rra_pointer 100000
pre fetch -98842 --        nan 
pre fetch -98841 --        nan 
pre fetch -98840 --        nan 
pre fetch -98839 --        nan 
pre fetch -98838 --        nan 
pre fetch -98837 --        nan 
pre fetch -98836 --        nan 
pre fetch -98835 --        nan 
pre fetch -98834 --        nan 
pre fetch -98833 --        nan 
pre fetch -98832 --        nan 
pre fetch -98831 --        nan 
pre fetch -98830 --        nan 
pre fetch -98829 --        nan 
pre fetch -98828 --        nan 
pre fetch -98827 --        nan 
pre fetch -98826 --        nan 
pre fetch -98825 --        nan 
pre fetch -98824 --        nan 
pre fetch -98823 --        nan 
pre fetch -98822 -- 
Program received signal SIGSEGV, Segmentation fault.
0x0804e396 in rrd_fetch_fn (filename=0x809af30 "/tmp/test.rrd",
cf_idx=CF_AVERAGE, start=0x809b210, end=0x809b214, step=0xbffe5cbc,
ds_cnt=0x809b21c, 
    ds_namv=0x809b224, data=0x809b228) at rrd_fetch.c:304
304    *(data_ptr++) = DNAN;



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