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vmstat and floating point exception [message #47139] Tue, 10 July 2012 23:50
Mark Johanson is currently offline  Mark Johanson
Messages: 10
Registered: May 2011
Junior Member
From: *parallels.com
Linux solusvm.a2hosting.com 2.6.32-042stab053.5 #1 SMP Tue Mar 27
vzctl version 3.3
vswap is enabled

Since upgrading to a 2.6.32 kernel one of our users noticed that they
are occasionally getting a Floating Point Exception when running vmstat:

[root@server ~]# vmstat 1 5
procs -----------memory---------- ---swap-- -----io---- --system--
-----cpu------
r b swpd free buff cache si so bi bo in cs us sy
id wa st
0 0 0 2048244 0 32816 0 0 0 2 0 7627 0 0
99 0 0
0 0 0 2048236 0 32816 0 0 0 0 0 110 0 0
100 0 0
0 0 0 2048236 0 32816 0 0 0 0 0 78 0 0
100 0 0
0 0 0 2048236 0 32816 0 0 0 0 0 91 0 0
100 0 0
Floating point exception

It doesn't happen every time as you can see here:

[root@server ~]# vmstat 1 10
procs -----------memory---------- ---swap-- -----io---- --system--
-----cpu------
r b swpd free buff cache si so bi bo in cs us sy
id wa st
0 0 0 2068584 0 12472 0 0 0 0 0 1745 0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 82 0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 77 0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 109 0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 92 0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 80 0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 87 0 0
100 0 0
0 0 0 2068576 0 12472 0 0 0 0 0 66 0 0
100 0 0
0 0 0 2068588 0 12472 0 0 0 0 0 130 0 0
100 0 0
0 0 0 2068588 0 12472 0 0 0 0 0 72 0 0
100 0 0

I have been able to replicate this issue in other OS templates (theirs
is Ubuntu 11.10, but I have replicated in Ubuntu, Fedora, Centos,
etc...) running the same kernel and vzctl version.

I can not replicate this issue on the node.

Wondering if anyone else has run across this issue and/or knows what
might be causing it.
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