[Xen-bugs] [Bug 709] New: [XEN-HVM] xm-test hangs during enforce_dom0_cpus test

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=709

           Summary: [XEN-HVM] xm-test hangs during enforce_dom0_cpus test
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: Linux
            Status: NEW
          Severity: blocker
          Priority: P1
         Component: HVM
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: ricardoz@xxxxxxxxxx
                CC: niv@xxxxxxxxxx, pl@xxxxxxxxxx, dbarrera@xxxxxxxxxx,
                    khoa@xxxxxxxxxx


dom0 OS: sles9-sp3
system: x460
cpus: 4 dual core (VTI)
RAM: 2GB

Problem Description:

I downloaded the latest xen-unstable tree and compiled it and rebooted system.
After the reboot, I went ahead and started an HVM xm-test run. Everything
looked good when it started. After 1hr or so, I checked back on my test run and
found out that it is getting stuck in the enforce_dom0_cpus test. This happens
in both 32bit and 64bit.

I added debug flag to xm-test ( Console.py ) to get more info about it and
found the following:

NOTE: I had to Ctrl-c out of the test to get the debug info.

[dom0] Running `/etc/init.d/xend start'
Traceback (most recent call last):
 File "./01_enforce_dom0_cpus_basic_pos.test", line 76, in ?
   status = restartXend()
 File "/usr/xen/xen-unstable.hg/tools/xm-test/lib/XmTestLib/Xm.py", line 207,
in restartXend
   status, output = traceCommand("/etc/init.d/xend start")
 File "/usr/xen/xen-unstable.hg/tools/xm-test/lib/XmTestLib/Test.py", line 99,
in traceCommand
   status, output = commands.getstatusoutput(command)
 File "/usr/lib64/python2.3/commands.py", line 59, in getstatusoutput
   tmp = pipe.read()
KeyboardInterrupt
FAIL: 01_enforce_dom0_cpus_basic_pos.test
===================
1 of 1 tests failed
===================
make[2]: *** [check-TESTS] Error 1
make[1]: *** [check-am] Interrupt
make: *** [check-recursive] Interrupt 

I tracked it down to a piece of code in commands.py from python package. Here
is the piece of code it is getting stuck in:

def getstatusoutput(cmd):
    """Return (status, output) of executing cmd in a shell."""
    import os
    pipe = os.popen('{ ' + cmd + '; } 2>&1', 'r')
    text = pipe.read()    <------------------------------------- HERE
    sts = pipe.close()
    if sts is None: sts = 0
    if text[-1:] == '\n': text = text[:-1]
    return sts, text

Execution does not go past that line at all. Something is blocking the
pipe.read().


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