possible race on HEAD?

[Matthew Dillon]

:So I noticed that I wasn't getting my morning emails from periodic...
:When I looked at ps, it showed that the tasks have been running for
:hours.  Also, I noticed that some nightly cron jobs were also running.
:One of these was cvsup...about 10 of them.  So when I did a 'killall
:cvsup' I figured they'd go away.  No such luck.  Then I 'killall -9
:cvsup'.  No change.  So, I investigated further by running a cvsup
:process myself.  It hung after "Parsing supfile "/root/DragonFly-supfile"".
:Hitting ctrl-c had no effect (other than printing ^C on my term).  Running
:ktrace on that process left me with a blank ktrace.out.  'ps alx' looks like:
:
:  UID   PID  PPID CPU PRI  NI   VSZ  RSS WCHAN  STAT  TT       TIME COMMAND
:    0  7027  1084   0 152   0  1632 1036 clock  DL+   p5    0:00.09 cvsup -L 2 /root/DragonFly-supfile
:
:
:Some of the other cvsups have vnode instead of clock.
:
:ylem:~# uname -a
:DragonFly ylem.theshell.com 1.9.0-DEVELOPMENT DragonFly 1.9.0-DEVELOPMENT #10: Wed May  9 18:32:59 EDT 2007     root at ylem.theshell.com:/usr/obj/usr/src/sys/YLEM  i386
:(sources from May 9th)
:
:Ideas of how I can further troubleshoot?
:
:--Peter

    "clock" is a namecache lock.  It's possible that you found a deadlock
    but it is also possible that a low level block device or NFS mount got
    stuck or something of that ilk.

    Drop into the debugger, panic the system, and see if you can get a
    kernel core dump.  If you can, upload the core and the kernel to leaf.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>