[Pkg-xen-devel] Bug#630984: xen-utils-common: shutdown hangs with xenwatch and reboot being blocked

[Andreas Pflug]

Package: xen-utils-common
Version: 4.0.0-1
Severity: normal
Tags: squeeze

The host runs (at the time of testing) a single linux-x86 domu (128MB, 
1VCPU).
When issuing a reboot, everything looks as expected:
- domu is saved
- xend is stopped
- drbd stopped
- lvms unmounted
- md0..4 stopped
and the message "rebooting now" appears, but nothing happens until
"INFO: task xenwatch is blocked for 120 seconds" and
"INFO: task reboot is blocked for 120 seconds" appear. A hard reset is 
necessary to resume.

Poking around I found that waiting for things to settle after the domu 
has been saved helps. For this, I modified /etc/init.d/xendomains, 
sleeping for 2 seconds a the end of the stop() function. One second of 
sleep sometimes wasn't enough.

*** xendomains-org    Sun Jun 19 15:26:49 2011
--- xendomains    Sun Jun 19 15:27:13 2011
***************
*** 342,347 ****
--- 342,350 ----
       kill $WDOG_PID >/dev/null 2>&1
       fi

+     # prevent race condition
+     sleep 2
+
       # Unconditionally delete lock file
       rm -f $LOCKFILE
   }



-- System Information:
Debian Release: 6.0.1
   APT prefers stable-updates
   APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-xen-amd64 (SMP w/8 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash

Versions of packages xen-utils-common depends on:
ii  gawk                    1:3.1.7.dfsg-5   GNU awk, a pattern scanning 
and pr
ii  lsb-base                3.2-23.2squeeze1 Linux Standard Base 3.2 
init scrip
ii  udev                    164-3            /dev/ and hotplug 
management daemo
ii  xenstore-utils          4.0.1-2          Xenstore utilities for Xen

xen-utils-common recommends no packages.

xen-utils-common suggests no packages.

-- Configuration Files:
/etc/init.d/xendomains changed [not included]