Yes, cross-copy from mbx to traditional Unix is the main deadlock that was
fixed.
On Wed, 16 Apr 2008, Ken Keating wrote:
That seems to be an accurate interpretation. Since you indicated there is
always a read lock on the mbx mailbox, apparently process 6509 can't complete
until the write lock held by pid 518 is released.
The only mbx format mailbox is /var/mail/myuser.mbx, everything else is a
traditional format mailbox, including /home/myuser/Mail/Trash. We're running
version 2006j. The release notes for version 2006k discuss a very similar
problem correcting deadlock issues. Since our mail clients eventually
recover I wasn't positive this was the same problem. If it is, the deadlock
must get broken after a timeout period of about 30 mins.
We're going to install the latest release to see if this fixes our problem.
Ken Keating
Mark Crispin wrote, On 04/15/08 21:33:
In mbx format, there is always a read lock on the mbx mailbox.
If I'm interpreting this output correctly, process 518 is stuck and sitting
on the write lock for the file in question (what format is
/home/myuser/Mail/Trash ?) and that causes the bottleneck.
Also, what version are you running? This may be something that I already
fixed.
On Tue, 15 Apr 2008, Ken Keating wrote:
On Mon, 14 Apr 2008, Ken Mandelberg wrote:
Should there be a problem with imapd serving an mbx INBOX, with other
folders in traditional file format? Some of our users with that setup
report hangs trying to move mail from their INBOX to a folder.
There should be no problem. UW imapd looks at the mailbox contents to
determine its format, and automatically selects the correct driver.
-- Mark --
I'll try to provide some details so hopefully someone can help us pinpoint
the problem. I gathered some data from my Thunderbird 2.0.0.6 session
this morning when this problem occurred. I attempted to delete a message
so it would be moved from my mbx-format inbox to a traditional-format
trash folder. To aid our investigation we wrote a simple script called
imapwho:
[EMAIL PROTECTED] ~]# cat imapwho
#!
if [ $# = 1 ]
then
who="-u $1"
fi
for i in `pgrep $who imap`
do
echo ==============
ps -fp $i |grep -v UID
pfiles $i |egrep "peer|/var/mail|home|lock" |uniq
done
When this problem first appeared, this script showed:
[EMAIL PROTECTED] ~]# imapwho myuser
==============
myuser 585 307 0 08:32:05 ? 0:00 imapsd
peername: AF_INET 170.140.150.120 port: 62815
/home/myuser/Mail/Sun_cases/65881036
==============
myuser 564 307 0 08:31:57 ? 0:00 imapsd
peername: AF_INET 170.140.150.120 port: 62814
/home/myuser/Mail/Sun_cases/65623982
==============
myuser 545 307 0 08:31:49 ? 0:00 imapsd
peername: AF_INET 170.140.150.120 port: 62813
/home/myuser/Mail/Photoshop
==============
myuser 518 307 0 08:31:33 ? 0:01 imapsd
peername: AF_INET 170.140.150.120 port: 62812
/home/myuser/Mail/Trash
==============
myuser 6509 482 0 09:02:25 ? 0:00 imapsd
peername: AF_INET 170.140.150.120 port: 62809
advisory read lock set by process 482
/var/mail/myuser.mbx
/home/myuser/Mail/Trash
advisory write lock set by process 518
==============
myuser 482 307 0 08:31:26 ? 0:00 imapsd
peername: AF_INET 170.140.150.120 port: 62809
/var/mail/myuser.mbx
About a minute later we see:
[EMAIL PROTECTED] ~]# imapwho myuser
==============
myuser 585 307 0 08:32:05 ? 0:00 imapsd
peername: AF_INET 170.140.150.120 port: 62815
/home/myuser/Mail/Sun_cases/65881036
==============
myuser 6686 307 0 09:03:29 ? 0:00 imapsd
peername: AF_INET 170.140.150.120 port: 62866
advisory read lock set by process 482
/var/mail/myuser.mbx
==============
myuser 564 307 0 08:31:57 ? 0:00 imapsd
peername: AF_INET 170.140.150.120 port: 62814
/home/myuser/Mail/Sun_cases/65623982
==============
myuser 545 307 0 08:31:49 ? 0:00 imapsd
peername: AF_INET 170.140.150.120 port: 62813
/home/myuser/Mail/Photoshop
==============
myuser 518 307 0 08:31:33 ? 0:01 imapsd
peername: AF_INET 170.140.150.120 port: 62812
/home/myuser/Mail/Trash
==============
myuser 6710 6686 0 09:03:32 ? 0:00 imapsd
peername: AF_INET 170.140.150.120 port: 62866
advisory read lock set by process 6686
/var/mail/myuser.mbx
/home/myuser/Mail/Trash
advisory write lock set by process 518
==============
myuser 6509 482 0 09:02:25 ? 0:00 imapsd
peername: AF_INET 170.140.150.120 port: 62809
advisory read lock set by process 6686
/var/mail/myuser.mbx
/home/myuser/Mail/Trash
advisory write lock set by process 518
==============
myuser 482 307 0 08:31:26 ? 0:00 imapsd
peername: AF_INET 170.140.150.120 port: 62809
advisory read lock set by process 6686
/var/mail/myuser.mbx
Note the concurrent advisory read and write locks. Once this occurs we
continually get an authentication and an attempt to move the message every
1+ minutes. This results in two more imapsd processes being started.
After about 30 mins everything clears up and the message is successfully
moved. All other mail actions are suspended during this time. Just before
recovery there are 26 imapsd processes with read and write locks as well
as 26 imapsd processes with read locks on the inbox. A ps at this time
shows (note: the problem began around the time the 9:02:25 imapsd process
was started):
[EMAIL PROTECTED]> ps -ef|grep myuser|grep imap|grep -v grep|sort -k5
myuser 482 307 0 08:31:26 ? 0:00 imapsd
myuser 518 307 0 08:31:33 ? 0:01 imapsd
myuser 545 307 0 08:31:49 ? 0:00 imapsd
myuser 564 307 0 08:31:57 ? 0:00 imapsd
myuser 585 307 0 08:32:05 ? 0:00 imapsd
myuser 6509 482 0 09:02:25 ? 0:00 imapsd
myuser 6686 307 0 09:03:29 ? 0:00 imapsd
myuser 6710 6686 0 09:03:32 ? 0:00 imapsd
myuser 6861 307 0 09:04:37 ? 0:00 imapsd
myuser 6862 6861 0 09:04:38 ? 0:00 imapsd
myuser 6999 307 0 09:05:42 ? 0:00 imapsd
myuser 7009 6999 0 09:05:45 ? 0:00 imapsd
myuser 7182 307 0 09:06:50 ? 0:00 imapsd
myuser 7199 7182 0 09:06:52 ? 0:00 imapsd
myuser 7327 307 0 09:07:56 ? 0:00 imapsd
myuser 7330 7327 0 09:07:58 ? 0:00 imapsd
myuser 7859 307 0 09:09:03 ? 0:00 imapsd
myuser 7922 7859 0 09:09:15 ? 0:00 imapsd
myuser 8423 307 0 09:10:20 ? 0:00 imapsd
myuser 8427 8423 0 09:10:21 ? 0:00 imapsd
myuser 8534 307 0 09:11:26 ? 0:00 imapsd
myuser 8535 8534 0 09:11:29 ? 0:00 imapsd
myuser 8675 307 0 09:12:34 ? 0:00 imapsd
myuser 8676 8675 0 09:12:36 ? 0:00 imapsd
myuser 8901 307 0 09:13:40 ? 0:00 imapsd
myuser 8902 8901 0 09:13:42 ? 0:00 imapsd
myuser 9055 307 0 09:14:48 ? 0:00 imapsd
myuser 9073 9055 0 09:14:49 ? 0:00 imapsd
myuser 9233 307 0 09:15:52 ? 0:00 imapsd
myuser 9237 9233 0 09:15:54 ? 0:00 imapsd
myuser 9511 307 0 09:16:59 ? 0:00 imapsd
myuser 9529 9511 0 09:17:13 ? 0:00 imapsd
myuser 9827 307 0 09:18:16 ? 0:00 imapsd
myuser 9828 9827 0 09:18:19 ? 0:00 imapsd
myuser 10126 307 0 09:19:24 ? 0:00 imapsd
myuser 10135 10126 0 09:19:27 ? 0:00 imapsd
myuser 10926 307 0 09:20:31 ? 0:00 imapsd
myuser 10927 10926 0 09:20:35 ? 0:00 imapsd
myuser 11624 307 0 09:21:38 ? 0:00 imapsd
myuser 11625 11624 0 09:21:40 ? 0:00 imapsd
myuser 12100 307 0 09:22:44 ? 0:00 imapsd
myuser 12101 12100 0 09:22:45 ? 0:00 imapsd
myuser 12534 307 0 09:23:49 ? 0:00 imapsd
myuser 12539 12534 0 09:23:52 ? 0:00 imapsd
myuser 12878 307 0 09:24:56 ? 0:00 imapsd
myuser 12881 12878 0 09:24:58 ? 0:00 imapsd
myuser 13309 307 0 09:26:03 ? 0:00 imapsd
myuser 13348 13309 0 09:26:15 ? 0:00 imapsd
myuser 13799 307 0 09:27:20 ? 0:00 imapsd
myuser 13828 13799 0 09:27:22 ? 0:00 imapsd
myuser 14251 307 0 09:28:25 ? 0:00 imapsd
myuser 14252 14251 0 09:28:28 ? 0:00 imapsd
myuser 14623 307 0 09:29:31 ? 0:00 imapsd
myuser 14627 14623 0 09:29:37 ? 0:00 imapsd
myuser 15077 307 0 09:30:41 ? 0:00 imapsd
myuser 15078 15077 0 09:30:45 ? 0:00 imapsd
[EMAIL PROTECTED]> ps -ef|grep myuser|grep imap|grep -v grep|wc
56 448 3248
Ken Keating
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-- Mark --
http://staff.washington.edu/mrc
Science does not emerge from voting, party politics, or public debate.
Si vis pacem, para bellum.
-- Mark --
http://panda.com/mrc
Democracy is two wolves and a sheep deciding what to eat for lunch.
Liberty is a well-armed sheep contesting the vote.
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