[Fedora-xen] Recurring Zombie (XenU used as a web server)

[Gregor Pirnaver]

For some weeks I have a problem with XenU domain used as web server. It is
turning into Zombie domain:

# xm list
Name                              ID Mem(MiB) VCPUs State  Time(s)
Domain-0                           0      641     4 r-----   263.6
Zombie-wwwmain                     2      512     1 ----cd  5238.4
dns                                4      128     1 -b----    20.1
intranet                           6      512     1 -b----    18.7
ldap                               5      128     1 -b----    61.4
mail                               3      512     1 r-----  1078.0
www                                1      512     1 -b----   117.7
wwwextra                           7      512     1 -b----    33.2

(Both Xen0 and XenU are running FC5 with kernel 2.6.17-1.2174.)

- How can I find out what is causing this problem?
- How can I fix it / work around it / report a bug?

This is production machine so I would appriciate any pointers. I didn't have
this problem before. Maybe new kernel is causing the problem? Is there a way to
get older versions of kernel packages?


I would also like to note that when this happens networking doesn't work in ANY
XenU domain. E.g.:

# xm console dns
after login trying to ping Google IP:
# ping 72.14.221.104
PING 72.14.221.104 (72.14.221.104) 56(84) bytes of data.
ping: sendmsg: No buffer space available
ping: sendmsg: No buffer space available
ping: sendmsg: No buffer space available
...

and when I run "init 0" in XenU (e.g. in dns XenU):
# init 0
it hangs at this step: "Removing module iptables: "

When I try to shutdown XenU from Xen0 it also turns to Zombie. E.g. (dns XenU
domain turns into Zombie-dns):
# xm shutdown dns

What can I do?

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