[DragonFlyBSD - Bug #2535] Imap processes apparentlt blocked on disk I/O

[Francois Tigeot via Redmine]

Issue #2535 has been reported by ftigeot.

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Bug #2535: Imap processes apparentlt blocked on disk I/O
http://bugs.dragonflybsd.org/issues/2535

Author: ftigeot
Status: New
Priority: Normal
Assignee: 
Category: 
Target version: 


I have recently found a few blocked dovecot processes on a DragonFly 3.3 imap server.

Software: Dovecot-2.1.15, DragonFly-3.3 from March 11, 2013

ps auxw output:

user1  3361  0.0  0.0  31416   2804 ??  D1LM   Fri03PM   0:01.42 imap: [user1 2001:7a8:1170:201:225:90ff:f
user1  3499  0.0  0.0  31484   2800 ??  D3LM   Fri03PM   0:00.51 imap: [user1 2001:7a8:1170:201:225:90ff:f

top output:

  PID USERNAME      NICE  SIZE    RES    STATE CPU  TIME   CTIME    CPU COMMAND
 3361 user1           0    31M  2804K    clock  1   0:01    0:01  0.00% imap
 3499 user1           0    31M  2800K    clock  3   0:00    0:00  0.00% imap


The 'clock' state may be set from vfs_cache.c:356:

		error = tsleep(&ncp->nc_locktd, PINTERLOCKED,
			       "clock", nclockwarn);

I have not found any other obvious place in sys/ using it.

The dovecot user stores emails on a Maildir directory on a HAMMER filesystem.
All files in the Maildir/ directory seem to be normally accessible; I could read it completely and store its
content into a tar archive without any issue.



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