pybootchartgui crashed with ZeroDivisionError in _parse_proc_disk_stat_log()

[Oliver Grawert]

Binary package hint: pybootchartgui

on an armel imx51 system (licid alpha2) i'm greeted with an apport notification from pybootchartgui.

ProblemType: Crash
Architecture: armel
Date: Wed Jan 13 11:56:57 2010
DistroRelease: Ubuntu 10.04
ExecutablePath: /usr/bin/pybootchartgui
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha armel+imx51 (20100112.2)
InterpreterPath: /usr/bin/python2.6
Package: pybootchartgui 0+r139-2
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/bootchart --format=png --crop-after=gnome-panel --output=/var/log/bootchart /var/log/bootchart/hostname-lucid-20100113-4.tgz
ProcEnviron:

ProcVersionSignature: Ubuntu 2.6.31-602.4-imx51
PythonArgs: ['/usr/bin/bootchart', '--format=png', '--crop-after=gnome-panel', '--output=/var/log/bootchart', '/var/log/bootchart/hostname-lucid-20100113-4.tgz']
SourcePackage: pybootchartgui
Tags: lucid
Title: pybootchartgui crashed with ZeroDivisionError in _parse_proc_disk_stat_log()
Uname: Linux 2.6.31-602-imx51 armv7l
UserGroups:

[Paul Larson (pwlars)]

Seems to be reading numCpu incorrectly and dividing by 0

[Anders Norgaard (anders-norgaard)]

Hi,

Can you upload the

/var/log/bootchart/$hostname-lucid-$date.tgz

that causes the crash? Then I'll have a look.

Best
Anders

[Anders Norgaard (anders-norgaard)]

Ah, yes. The cpu information seems to be missing. This is what the "header" file looks like in the .tgz

version = 0.90.2-5
title = Boot chart for b3 (Wed Jan 13 12:09:03 CST 2010)
system.uname = Linux 2.6.31-602-imx51 #4-Ubuntu Mon Jan 11 17:05:57 UTC 2010 armv7l
system.release = Ubuntu lucid (development branch)
system.cpu = (0)
system.kernel.options = root=UUID=d7b8167d-555b-45ba-88cc-94b8b187cda8 ro quiet splash

A quick workaround in pybootchartgui is to simply delete the " / numCpu" in

  File "/home/anders/devel/pybootchartgui/pybootchartgui/parsing.py", line 161, in _parse_proc_disk_stat_log
    util = float( sums[2] ) / 10 / interval / numCpu

(the cpu usage graph is relative anyway)

Best
Anders

[Anders Norgaard (anders-norgaard)]

When I look in the bootchart-gather.sh file in the bootchart package the line that outputs the "header" file is

echo "system.cpu = $(grep '^model name' /proc/cpuinfo)"\
         "($(grep -c '^model name' /proc/cpuinfo))"

How does that match the output on you arm machine? What does /proc/cpuinfo show?

[Paul Larson (pwlars)]

Attaching cpuinfo

[Paul Larson (pwlars)]

Tested on armel, it now gathers correct information for the number of processors.

[Paul Larson (pwlars)]

updated debdiff including Oliver's suggestion to cover arm* instead of just armv7

[Launchpad Janitor (janitor)]

This bug was fixed in the package bootchart - 0.90.2-6

---------------
bootchart (0.90.2-6) lucid; urgency=low

  * Get correct cpu count on armel (LP: #506910).
 -- Paul Larson <email address hidden> Thu, 04 Feb 2010 17:53:09 -0800