hi!
create a rrd database with the following statement:
#!/bin/sh
start=`date +'00:00 %m/%e/%Y'`
/usr/bin/rrdtool create $1.rrd \
--start "$start" \
--step 300 \
DS:total:GAUGE:600:0:U \
DS:new:GAUGE:600:0:U \
RRA:LAST:0.5:1:288 \
RRA:LAST:0.5:12:720 \
RRA:LAST:0.5:288:37200 \
RRA:AVERAGE:0.5:1:288 \
RRA:AVERAGE:0.5:12:720 \
RRA:AVERAGE:0.5:288:37200
when fetch data between several days with rrd_fetch, rrd_fecth will crash.
gdb the core file, finally I found that there is a overflow in rrd_fetch.c.
here is the patch
[CODE]
diff -Nur rrdtool-1.3.4/rrdtool-1.3.4/src/rrd_fetch.c
rrdtool-1.3.4_/rrdtool-1.3.4/src/rrd_fetch.c
--- rrdtool-1.3.4/rrdtool-1.3.4/src/rrd_fetch.c Sun Oct 5 00:04:04
2008
+++ rrdtool-1.3.4_/rrdtool-1.3.4/src/rrd_fetch.c Tue Nov 25 16:55:04 2008
@@ -345,7 +345,7 @@
rra_start_time = (rra_end_time
- (*step * (rrd.rra_def[chosen_rra].row_cnt - 1)));
/* here's an error by one if we don't be careful */
- start_offset = (long) (*start + *step - rra_start_time) / (long) *step;
+ start_offset = (long)(((double)(*start)/(long)*step) + 1 -
((double)(rra_start_time)/(long)*step));
end_offset = (long) (rra_end_time - *end) / (long) *step;
#ifdef DEBUG
fprintf(stderr,
[/CODE]
--
zou guangxian
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