[Pkg-xen-devel] Bug#640500: xen-hypervisor-4.0-amd64: xend invokes oomkiller and reboots machine when creating DomU's

[Wiebe Cazemier]

Package: xen-hypervisor-4.0-amd64
Version: 4.0.1-2
Severity: normal
Tags: upstream

When creating Xen DomU's, at some point xend invokes the oom-killer and
the entire machine restarts:

Sep  5 12:04:59 arbiter kernel: [259697.101212] __ratelimit: 136
callbacks suppressed
Sep  5 12:04:59 arbiter kernel: [259697.101218] xend invoked oom-killer:
gfp_mask=0x200da, order=0, oom_adj=0
Sep  5 12:04:59 arbiter kernel: [259697.101225] xend cpuset=/
mems_allowed=0
Sep  5 12:04:59 arbiter kernel: [259697.101230] Pid: 1841, comm: xend
Not tainted 2.6.32-5-xen-amd64 #1
Sep  5 12:06:23 arbiter kernel: imklog 4.6.4, log source = /proc/kmsg
started.
Sep  5 12:06:23 arbiter rsyslogd: [origin software="rsyslogd"
swVersion="4.6.4" x-pid="1409" x-info="http://www.rsyslog.com"]
(re)start
Sep  5 12:06:23 arbiter kernel: [    0.000000] Initializing cgroup
subsys cpuset

xm info says the machine has 10231 MB of RAM. These are the VMs that
normally run:

Name                     ID   Mem VCPUs      State Time(s)
Domain-0                 0  2177     1     r----- 127.1
one                      1  1536     2     r----- 192.4
two                      2   512     1     -b---- 2.7
three                    3  1024     1     -b---- 188.6
four                     4   512     1     -b---- 12.7
five                     5  2048     2     -b---- 151.7
six                      6  1024     2     r----- 64.9
seven                    7  1024     2     -b---- 65.9
eight                    8  1024     2     -b---- 100.7

That means 8704 MB of memory is used. 

Over the last couple of days, I've experienced that when creating two
VM's with 512 MB RAM, the oom-killer is invoked. This should not happen
because Dom0 can shrink and because the machine should not restart when
it is out of memory.

This is a production Xen host, which is becomming a liability, because
it's so unpredictable.

Current Dom0 kernel: Linux arbiter 2.6.32-5-xen-amd64 

-- System Information:
Debian Release: 6.0.2
  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/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

xen-hypervisor-4.0-amd64 depends on no packages.

Versions of packages xen-hypervisor-4.0-amd64 recommends:
ii  xen-utils-4.0                 4.0.1-2    XEN administrative tools

Versions of packages xen-hypervisor-4.0-amd64 suggests:
pn  xen-docs-4.0                  <none>     (no description available)

-- no debconf information