Re: [Xen-devel] repeatable time jump

[David Becker <becker@xxxxxxxxxxx>]

" linux-2.6.8.1-xen-sparse/arch/xen/i386/kernel/time.c and see what
" comes out when you run your test. It's also interesting to see
" what output comes out after the time skip whenever you run date. 

OK, I pulled and patched.   I ran date in a loop as xenU was shutdown
and time jumped 4293 secs from 1096637912.846396000 to 1096642205.961018000
ntpd was running in xen0.

The console is getting continuous Clamp messages.  The xen0 Syslog says:

Oct  1 09:34:44 rack043-xen kernel: device eth0 entered promiscuous mode
Oct  1 09:34:44 rack043-xen kernel: xen-br0: port 1(eth0) entering learning 
stat e
Oct  1 09:34:44 rack043-xen kernel: xen-br0: topology change detected, 
propagati ng
Oct  1 09:34:44 rack043-xen kernel: xen-br0: port 1(eth0) entering forwarding 
st ate
Oct  1 09:34:44 rack043-xen kernel: Clamp time 1096637684 1096637684
Oct  1 09:36:20 rack043-xen kernel: device vif1.0 entered promiscuous mode
Oct  1 09:36:21 rack043-xen kernel: xen-br0: port 2(vif1.0) entering learning 
st ate
Oct  1 09:36:21 rack043-xen kernel: xen-br0: topology change detected, 
propagati ng
Oct  1 09:36:21 rack043-xen kernel: xen-br0: port 2(vif1.0) entering forwarding 
state
Oct  1 09:37:10 rack043-xen ntpd[838]: synchronized to LOCAL(0), stratum 13
Oct  1 09:37:10 rack043-xen ntpd[838]: kernel time sync disabled 0041
Oct  1 09:38:01 rack043-xen /USR/SBIN/CRON[955]: (mail) CMD (  if [ -x 
/usr/lib/ exim/exim3 -a -f /etc/exim/exim.conf ]; then /usr/lib/exim/exim3 -q ; 
fi)
Oct  1 09:38:16 rack043-xen ntpd[838]: synchronized to 172.16.4.1, stratum 3
Oct  1 09:38:32 rack043-xen kernel: device vif1.0 left promiscuous mode
Oct  1 09:38:32 rack043-xen kernel: xen-br0: port 2(vif1.0) entering disabled st
ate
Oct  1 10:50:05 rack043-xen kernel: xen-br0: port 2(vif1.0) entering disabled st
ate
Oct  1 10:50:06 rack043-xen kernel: Clamp time 1096642206 1096642206
Oct  1 10:50:06 rack043-xen last message repeated 529 times
Oct  1 10:50:06 rack043-xen kernel: Clamp 206
Oct  1 10:50:06 rack043-xen kernel: Clamp time 1096642206 1096642206
Oct  1 10:50:06 rack043-xen last message repeated 112 times
Oct  1 10:50:06 rack043-xen kernel: Clamp time 109664220206
Oct  1 10:50:06 rack043-xen kernel: Clamp time 1096642206 1096642206
Oct  1 10:50:06 rack043-xen last message repeated 112 times
Oct  1 10:50:06 rack043-xen kernel: Clamp time 109664220206
Oct  1 10:50:06 rack043-xen kernel: Clamp time 1096642206 1096642206
Oct  1 10:50:06 rack043-xen last message repeated 112 times
Oct  1 10:50:06 rack043-xen kernel: Clamp time 109664220206
Oct  1 10:50:06 rack043-xen kernel: Clamp time 1096642206 1096642206
Oct  1 10:50:06 rack043-xen last message repeated 112 times
Oct  1 10:50:06 rack043-xen kernel: Clamp time 109664220206
Oct  1 10:50:06 rack043-xen kernel: Clamp time 1096642206 1096642206
Oct  1 10:50:06 rack043-xen last message repeated 112 times
Oct  1 10:50:06 rack043-xen kernel: Clamp time 109664220206
Oct  1 10:50:06 rack043-xen kernel: Clamp time 1096642206 1096642206



If I try xm dmesg at this point, xm hangs.  Looks like it is waiting for
xend to say sometime. After ctrl-C xm says:

rack043-xen:~# xm dmesg
Traceback (most recent call last):
  File "/usr/sbin/xm", line 6, in ?
    main.main(sys.argv)
  File
"/usr/research/playground/becker/xen/obj-unstable/xeno-unstable.bk/install/lib/python/xen/xm/main.py",
line 786, in main
    xm.main(args)
  File
"/usr/research/playground/becker/xen/obj-unstable/xeno-unstable.bk/install/lib/python/xen/xm/main.py",
line 105, in main
    self.main_call(args)
  File
"/usr/research/playground/becker/xen/obj-unstable/xeno-unstable.bk/install/lib/python/xen/xm/main.py",
line 123, in main_call
    p.main(args[1:])
  File
"/usr/research/playground/becker/xen/obj-unstable/xeno-unstable.bk/install/lib/python/xen/xm/main.py",
line 684, in main
    print server.xend_node_dmesg()
  File
"/usr/research/playground/becker/xen/obj-unstable/xeno-unstable.bk/install/lib/python/xen/xend/XendClient.py",
line 183, in xend_node_dmesg
    return self.xendGet(self.nodeurl('dmesg'))
  File
"/usr/research/playground/becker/xen/obj-unstable/xeno-unstable.bk/install/lib/python/xen/xend/XendClient.py",
line 145, in xendGet
    return self.client.xendGet(url, args)
  File
"/usr/research/playground/becker/xen/obj-unstable/xeno-unstable.bk/install/lib/python/xen/xend/XendProtocol.py",
line 68, in xendGet
    return self.xendRequest(url, "GET", args)
  File
"/usr/research/playground/becker/xen/obj-unstable/xeno-unstable.bk/install/lib/python/xen/xend/XendProtocol.py",
line 143, in xendRequest
    resp = conn.getresponse()
  File "/usr/lib/python2.3/httplib.py", line 778, in getresponse
    response.begin()
  File "/usr/lib/python2.3/httplib.py", line 273, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python2.3/httplib.py", line 231, in _read_status
    line = self.fp.readline()
  File "/usr/lib/python2.3/socket.py", line 323, in readline
    data = recv(1)
KeyboardInterrupt



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