Bug 598483

Summary: gdm-simple-greeter uses 100% CPU if password file is big
Product: Red Hat Enterprise Linux 6 Reporter: Matthias Schroder <matthias.schroder>
Component: gdmAssignee: jmccann
Status: CLOSED CURRENTRELEASE QA Contact: desktop-bugs <desktop-bugs>
Severity: medium Docs Contact:
Priority: low    
Version: 6.0CC: caillon, cschalle, rlat, rstrode, tpelka
Target Milestone: rcKeywords: Rebase
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: gdm-2.30.4-2.el6 Doc Type: Rebase: Bug Fixes and Enhancements
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-11-10 15:27:44 EST Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Description Matthias Schroder 2010-06-01 09:27:03 EDT
Description of problem: When the password file is big, and disable_user_list is false, gdm-simple-greeter uses 100% CPU for several minutes after startup

Version-Release number of selected component (if applicable): 2.28.2-5.el6.x86_64

How reproducible: 100%

Steps to Reproduce:
1. Use large password file
2. boot machine
3. watch gdm-simple-greeter hogging CPU
Actual results: gdm-simple-greeter hogs CPU

Expected results: CPU available for useful things

Additional info: 

1) Setting disable_user_list to true (I had to search quite a bit to find that one) avoids the issue.

2) This could be related to https://bugzilla.redhat.com/show_bug.cgi?id=598145

3) Numbers: processing a ~22k password file takes 5 minutes :(
Comment 2 RHEL Product and Program Management 2010-06-07 12:07:47 EDT
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
Comment 3 Ray Strode [halfline] 2010-06-11 09:58:26 EDT
Just an update here.

Jon has done considerable work making this quite fast upstream.
Comment 4 Ray Strode [halfline] 2010-06-11 10:30:44 EDT
We should rebase to pull this in.  Otherwise we're going to have a bunch of pointless patches in cvs that will make maintainability more difficult.  The gnome-2-30 branch is all minor bugfixes and translation updates.
Comment 5 Tomas Pelka 2010-06-16 02:54:42 EDT
Reproducer in #c0, giving qa_ack.
Comment 7 jmccann 2010-06-22 14:12:51 EDT
*** Bug 598145 has been marked as a duplicate of this bug. ***
Comment 8 Ray Strode [halfline] 2010-06-29 15:22:28 EDT
Should be good to go.
Comment 10 Matthias Schroder 2010-07-16 09:49:07 EDT
In beta 2 the time it takes for the simple-greeter is ok now. But the gdm-user-switch-applet still needs 1:45, and during that time I don't get the gnome-panel. I admit that the time has decreased significantly, but it is still quite long. And together with https://bugzilla.redhat.com/show_bug.cgi?id=610233 this becomes painful...
Comment 11 jmccann 2010-07-16 10:31:06 EDT
Please file a new bug for that.  Can you attach gdb to the user switch applet during this time and interrupt it a few times to see where it is spending time?  Thanks.
Comment 12 Radek Lat 2010-08-17 07:18:01 EDT
Tested with >40k password file on gdm-2.30.4-21.el6.x86_64. No CPU hogging. Moving to VERIFIED.
Comment 13 releng-rhel@redhat.com 2010-11-10 15:27:44 EST
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.