This problem is a bit out of the mainstream as it relates to guests that
terminate quickly, which the typical OS guest does not do, but my Java
guest applications sometimes do.
The problem manifests itself as the behavior below. I believe that the
cause is some race between the guest terminating, console output and the
xm code. I'm no Python expert but it doesn't look as if the error
handling in do_console is working correctly. Note that if the guest is
made to sleep for a second before terminating, this behavior never happens.
I've experienced this occasionally on Solaris xVM and very frequently on
various flavors of Xen/Linux.
Any insight appreciated.
Mick
# xm create -c xmconfigs/domain_config_generic extra=
-XX:SemiSpaceGC:Virtual -cp /guestvm/image/GuestVM/bin
test.java.lang.Null name=GuestVM-test.java.lang.Null-mjj
Unexpected error: <type 'exceptions.OSError'>
Please report to xen-devel@xxxxxxxxxxxxxxxxxxx
Traceback (most recent call last):
File "/usr/sbin/xm", line 10, in <module>
main.main(sys.argv)
File "/usr/lib64/python2.5/site-packages/xen/xm/main.py", line 2500,
in main
_, rc = _run_cmd(cmd, cmd_name, args)
File "/usr/lib64/python2.5/site-packages/xen/xm/main.py", line 2524,
in _run_cmd
return True, cmd(args)
File "<string>", line 1, in <lambda>
File "/usr/lib64/python2.5/site-packages/xen/xm/main.py", line 1302,
in xm_importcommand
cmd.main([command] + args)
File "/usr/lib64/python2.5/site-packages/xen/xm/create.py", line 1293,
in main
do_console(sxp.child_value(config, 'name', -1))
File "/usr/lib64/python2.5/site-packages/xen/xm/create.py", line 1318,
in do_console
(p, rv) = os.waitpid(cpid, os.WNOHANG)
OSError: [Errno 10] No child processes
[root@diy-3-15 GuestVMNative]#
create.py:
def do_console(domain_name):
cpid = os.fork()
if cpid != 0:
for i in range(10):
# Catch failure of the create process
time.sleep(1)
(p, rv) = os.waitpid(cpid, os.WNOHANG)
if os.WIFEXITED(rv):
if os.WEXITSTATUS(rv) != 0:
sys.exit(os.WEXITSTATUS(rv))
try:
# Acquire the console of the created dom
if serverType == SERVER_XEN_API:
domid = server.xenapi.VM.get_domid(
get_single_vm(domain_name))
else:
dom = server.xend.domain(domain_name)
domid = int(sxp.child_value(dom, 'domid', '-1'))
console.execConsole(domid)
except:
pass
print("Could not start console\n");
sys.exit(0)
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