Bug 55981

Summary:	NFS mailboxes won't unlock in imapd
Product:	[Retired] Red Hat Linux	Reporter:	John Dalbec <jpdalbec>
Component:	kernel	Assignee:	Arjan van de Ven <arjanv>
Status:	CLOSED ERRATA	QA Contact:	Brock Organ <borgan>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.1
Target Milestone:	---
Target Release:	---
Hardware:	i686
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2001-11-09 22:06:29 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description John Dalbec 2001-11-09 20:35:28 UTC

From Bugzilla Helper:
User-Agent: Mozilla/4.77 [en] (X11; U; Linux 2.4.9-6 i686)

Description of problem:
After imapd reads an NFS-mounted mailbox, it hangs trying to release the
fcntl() lock on it.  An strace -p shows data being read from the mailbox
and then the fcntl() call never returns.  A kill -9 is needed to terminate
the daemon, which then leaves .lock files behind.  The process is listed as
sleeping in ps.  At least it's not a 'D' wait!

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


How reproducible:
Always

Steps to Reproduce:
1. Mount IMAP mailbox over NFS.
2. Try to read messages.
3.
	

Actual Results:  IMAP server hangs trying to unlock mailbox.  Client
eventually times out but server processes hang around until killed -9.

Expected Results:  The lock should have been released.

Additional info:

NFS mounted filesystems here are ReiserFS, not sure what happens with
ext2/3.  Chris Mason of SuSE thinks it's not ReiserFS-specific.

Comment 1 John Dalbec 2001-11-09 20:58:46 UTC

OK, I've reproduced this with the standalone flock.c from the IMAP source.  I've
also reproduced it with an NFS mount of an ext2 filesystem.  Kernel 2.4.9-6
i686-enterprise.

Comment 2 Arjan van de Ven 2001-11-09 22:06:24 UTC

We've released an update for this several days ago; 2.4.9-12 has, appart from
the security fixes, also the NFS locking bug fixed. I recommend giving that a try.