atop unusable in Quantal: trap divide error

[Adam Porter]

After upgrading from Precise to Quantal, atop is completely unusable.

$ atop
$ dmesg | tail -2
[ 1292.322680] Process accounting paused
[ 1292.346494] atop[24981] trap divide error ip:407173 sp:7fffc9efb120 error:0 in atop[400000+25000]
$ atop
$ dmesg | tail -4
[ 1292.322680] Process accounting paused
[ 1292.346494] atop[24981] trap divide error ip:407173 sp:7fffc9efb120 error:0 in atop[400000+25000]
[ 1301.829009] Process accounting paused
[ 1301.852339] atop[24988] trap divide error ip:407173 sp:7fff9e886e50 error:0 in atop[400000+25000]

This bug report <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=686329> says this can happen if /var/run is nearly full, but it is not on my system:

$ df /var/run
Filesystem Size Used Avail Use% Mounted on
tmpfs 791M 768K 791M 1% /run

I tried purging and reinstalling atop, but it made no difference.

atop has always worked just fine until I upgraded to Quantal.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: atop 1.26-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
Uname: Linux 3.5.0-21-generic x86_64
ApportVersion: 2.6.1-0ubuntu9
Architecture: amd64
Date: Wed Jan 9 20:10:40 2013
InstallationDate: Installed on 2010-05-20 (965 days ago)
InstallationMedia: Kubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427)
MarkForUpload: True
ProcEnviron:
 LANGUAGE=
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: atop
UpgradeStatus: Upgraded to quantal on 2013-01-09 (0 days ago)

[Adam Porter (alphapapa)]

This bug no longer occurs in Raring.

[sz gy (gyszabolcs)]

The bug is present in wily 15.10...

kernel: [187758.771068] traps: atop[11199] trap divide error ip:4073e6 sp:7ffbffffac20 error:0 in atop[400000+26000]

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ariel Faigon (ariel.faigon)]

Started to occur for me after upgrading from 12.04 to 16.04

atop is mostly usable, but I see these (once per day, one sec after midnight) in kern.log:

May 19 00:00:01 hostname kernel: [746105.037456] traps: atop[1943] trap divide error ip:4073c2 sp:7fff3b17e200 error:0 in atop[400000+26000]

May 20 00:00:01 hostname kernel: [832515.341713] traps: atop[19356] trap divide error ip:4073c2 sp:7ffee489c910 error:0 in atop[400000+26000]

[Stefano Barbato (r-stefano)]

Same for me on ubuntu 16.04:

2016-06-22T00:00:01.323439+00:00 ip-10-13-62-24 CRON[28725]: (root) CMD (invoke-rc.d atop _cron)

2016-06-22T00:00:01.973658+00:00 ip-10-13-62-24 kernel: [1071894.917868] traps: atop[28805] trap divide error ip:4073c2 sp:7ffe18bef8d0 error:0 in atop[400000+26000]

[Leon Keijser (errtu)]

Which version fixes this? I'm currently on 16.04 using atop 1.26-2build1 and the bug is still present.

Jun 29 00:00:01 myhost kernel: [826159.413832] traps: atop[1812] trap divide error ip:4073c2 sp:7ffe3cd33530 error:0 in atop[400000+26000]

[Remy van Elst (raymii)]

Installing the 2.x release from 16.10 or higher fixes it in 16.04 for me: https://raymii.org/s/articles/atop_is_broken_on_Ubuntu_16.04.html