[Xen-bugs] [Bug 378] New: xm save deadlocks

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=378

           Summary: xm save deadlocks
           Product: Xen
           Version: unstable
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Tools
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: ewan@xxxxxxxxxxxxx


>From Gerd Knorr:

"xm save" doesn't work for me, the command just blocks forever.  In the
process list it looks like this:

 6567 ?        Ssl    0:00 python /usr/sbin/xend restart
 7978 ?        SL     0:00  \_ /usr/lib/xen/bin/xc_save 14 17 10 0 0 0

xc_save is blocked, in a write call to stderr:

  master-xen root /vm/ttylinux# strace -p7978
  Process 7978 attached - interrupt to quit
  write(2, "FNI 28 : [10000004,815] pte=2b92"..., 80 <unfinished ...>
  Process 7978 detached

7977 seems to be responsible for the xc_save and does this:

  master-xen root /vm/ttylinux# strace -p7977
  Process 7977 attached - interrupt to quit
  read(20,  <unfinished ...>
  Process 7977 detached

fd 20 is the other end of the *stdout* pipe, whereas xc_save writes
stuff to *stderr*.  Hmm.  Maybe xend causes the deadlock by simply
reading from the wrong file handle?

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