Bug 23207 - atd fork bomb
Summary: atd fork bomb
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: at   
(Show other bugs)
Version: 7.0
Hardware: i386 Linux
Target Milestone: ---
Assignee: Crutcher Dunnavant
QA Contact: Aaron Brown
Depends On:
TreeView+ depends on / blocked
Reported: 2001-01-03 06:53 UTC by Wesley Tanaka
Modified: 2007-04-18 16:30 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2001-01-03 10:00:17 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Excerpt from syslog messages (410.58 KB, text/plain)
2001-01-03 06:58 UTC, Wesley Tanaka
no flags Details

Description Wesley Tanaka 2001-01-03 06:53:58 UTC
This is the version of "at" that I have installed:

~ % rpm -qi at
Name        : at                           Relocations: (not relocateable)
Version     : 3.1.8                             Vendor: Red Hat, Inc.
Release     : 13                            Build Date: Thu 14 Dec 2000
08:01:27 PM PST
Install date: Sun 24 Dec 2000 12:53:28 PM PST      Build Host:
Group       : System Environment/Daemons    Source RPM: at-3.1.8-13.src.rpm
Size        : 76060                            License: GPL
Packager    : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
Summary     : Job spooling tools.
Description :
At and batch read commands from standard input or from a specified file.
At allows you to specify that a command will be run at a particular time
(now or a specified time in the future).  Batch will execute commands
when the system load levels drop to a particular level.  Both commands
use /bin/sh to run the commands.

You should install the at package if you need a utility that will do
time-oriented job control.  Note: you should use crontab instead, if it is
a recurring job that will need to be repeated at the same time every

At some point my system started thrashing a lot and, when I ran ps, I
noticed a lot of atd processes.

My syslog contains many entries of the following form:

Dec 20 10:47:00 altair atd[3874]: File a0007b00f88c5f is in wrong format -
Dec 20 10:47:00 altair atd[3875]: File a0007c00f88c60 is in wrong format -
Dec 20 10:47:00 altair atd[3876]: File a0007b00f88c5f is in wrong format -
Dec 20 10:47:00 altair atd[3877]: File a0007c00f88c60 is in wrong format -

I will attach an excerpt, later.

This was reproducable every time I (or init) started atd.

I unfortunately do not have the files in question, as I noticed the syslog
spooge much later than I clobbered /var/spool/at

Comment 1 Wesley Tanaka 2001-01-03 06:58:40 UTC
Created attachment 6985 [details]
Excerpt from syslog messages

Comment 2 Crutcher Dunnavant 2001-03-29 16:20:11 UTC
this looks like something in the at spool got corrupted on disk. reopen if you
see this again.

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