Bug 425919

Summary: dovecot-auth processes leave as defunct
Product: Red Hat Enterprise Linux 4 Reporter: Satoshi Sugimoto <c-ssugimoto>
Component: dovecotAssignee: Dan Horák <dhorak>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: low    
Version: 4.5   
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2008-08-11 08:56:50 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
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Description Satoshi Sugimoto 2007-12-17 08:31:52 UTC
Description of problem:
When CPU load-average is high, some dovecot-auth processes leave as defunct 
status. However, dovecot can work fine and does not crash during CPU load-
average is high.

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

How reproducible:
This server has joined Active Directory domain using samba winbindd.
(security=ADS in smb.conf)

Steps to Reproduce:
1. Join Active Directory domain using samba winbind.
2. Configure dovecot as pam authentication. (Edit /etc/pam.d/dovecot)
3. View "ps" during accesssing from MUA to dovecot.
Actual results:
Sometimes shows "defunct" process.

Expected results:
No zombie processes.

Additional info:
kernel - 2.6.9-55.0.2.ELsmp

Comment 1 Satoshi Sugimoto 2007-12-17 08:31:52 UTC
Created attachment 289752 [details]

Comment 2 Satoshi Sugimoto 2007-12-17 08:34:09 UTC
Created attachment 289753 [details]

Comment 3 Tomas Janousek 2007-12-20 18:17:52 UTC
Do these stay there for a long time? IOW if a process shows as defunct, does it
stay there forever? And if not, does it disappear within a second or rather
after a longer amount of time?

Comment 4 Satoshi Sugimoto 2007-12-21 00:39:40 UTC
Some defunct processes will disappear within a second.
And in my case, dovecot work fine. (Does not crash)
CPU load-average counts running or runnable processes include defunct process, 
doesn`t it?

Comment 5 Tomas Janousek 2007-12-21 08:52:34 UTC
Some or all?

CPU load-average counts running processes, zombies (defunct processes) are not
running, by definition.

Comment 6 Satoshi Sugimoto 2007-12-25 00:30:09 UTC
"ps" command is executed each five minutes on my system.
Three or four times a day, cpu load-average is high.
When it is occurred, dovecot defunct processes are much. (not all processes)
On other hand, there is not defunct processes when cpu load-average is low.

Comment 7 Tomas Janousek 2007-12-25 01:08:22 UTC
Yeah, but do they stay there? If they disappear within a second, why do you
think it is an issue?

Comment 8 Dan Horák 2008-06-10 07:48:31 UTC
Dovecot has its own process manager that takes care of creating and destroying
processes that are serving the authentication and data flow to the users.
Because you are saying that the auth process' count is varying during the time
and not continue to grow all the time then it is not an issue.