Note: This is a beta release of Red Hat Bugzilla 5.0. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Also email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback here.

Bug 77780

Summary: "ps ax" does not list all processes
Product: [Retired] Red Hat Linux Reporter: Aaron Sherman <ajs>
Component: procpsAssignee: Alexander Larsson <alexl>
Status: CLOSED NOTABUG QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 8.0CC: mustafa
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2002-11-13 15:02:53 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description Aaron Sherman 2002-11-13 15:02:45 UTC
From Bugzilla Helper:
User-Agent: Mozilla/5.0 Galeon/1.2.5 (X11; Linux i686; U;) Gecko/20020809

Description of problem:
Under Red Hat versions prior to 8.0, the output of "ps ax" and the list of
processes under /proc were roughly the same (given processes starting and
exiting during comparison) and some packages have been using this to evaluate ps
to determine if it has been compromised by a root kit. I have a tool that starts
with ps, then uses /proc then uses kill to look for hidden processes, and since
Red Hat 8.0 it's basically useless becuase it reports dozens of "hidden"
processes based on the output of ps.

I tried various other arguments (e.g. "ps agx", "ps ag", etc) and nothing seems
to work. Interestingly if I take one of the processes that are listed in /proc,
but not ps, and do a "ps ax --pid <pid>" it does not show up, but if I do a "ps
--pid <pid>" it does.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. ps ax
2. ls -d /proc/[0-9]*
3. compare the two

Actual Results:  Differences occur.

Expected Results:  No or very few differences.

Additional info:

Comment 1 Alexander Larsson 2002-11-14 08:57:35 UTC
This is a feature, and is mentioned in the release notes. If you want to see
every thread of each process, use the -m flag.

Comment 2 Alexander Larsson 2003-01-27 16:12:00 UTC
*** Bug 82757 has been marked as a duplicate of this bug. ***