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Incident report
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Resolution: Duplicate
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Major
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None
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2.4.7
I'm creating a stacked graph (20 items) with a maximum summed value of 1.1780625038049E+15 (bytes).
The error I get is:
ERROR: Y axis MAX value must be greater than Y axis MIN value
bcdiv(): Division by zero [chart.php:126 → ClineGraphDraw->draw() → bcdiv() in /usr/share/zabbix/include/classes/graphdraw/CLineGraphDraw.php:2364
It seems that the bcmath functions do not handle scientifically notated strings properly (or at all). Evidence: http://stackoverflow.com/questions/21886257/bcdiv-using-very-small-float-with-scientific-notation-cause-division-by-zero-e
I hacked myself a solution: if I detect a value in scientific notation, use sprintf to convert it to "unscientific" notation. You will probably construct a better and more permanent solution.
[root@zbx01 ~]# diff -u /usr/share/zabbix/include/classes/graphdraw/CLineGraphDraw.php{-dd20160203BD,}
--- /usr/share/zabbix/include/classes/graphdraw/CLineGraphDraw.php-dd20160203BD 2015-11-12 11:12:33.000000000 +0100
+++ /usr/share/zabbix/include/classes/graphdraw/CLineGraphDraw.php 2016-02-03 13:58:31.390193635 +0100
@@ -684,7 +684,12 @@
continue;
}
- $val[$ci] = bcadd($shift_val[$ci], $val[$ci]);
+ if (preg_match ('/^[+-]?(\d*\.)?\d+[eE][+-]?\d+$/', $shift_val[$ci])) {
+ $val[$ci] = bcadd(sprintf('%f', $shift_val[$ci]), $val[$ci]);
+ }
+ else {
+ $val[$ci] = bcadd($shift_val[$ci], $val[$ci]);
+ }
}
if (!isset($maxY)) {
- duplicates
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- Reopened
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