guestcontrol execute still sometimes hangs (#8235)

[Nox Metus]

virtualbox-4.1 (4.1.2-73507~Ubuntu~natty) on Ubuntu x64 server host, Windows 7 x64 guest.

VBoxManage still sometimes hangs when performing guestcontrol execute as it is described in #8235.

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$ sudo -Hu builder vboxmanage guestcontrol Win7x64Build execute "c:\\windows\\system32\\where.exe" --username "build" --password "secretpassword" --wait-stdout --verbose -- where
Waiting for guest to start process ...
Process 'c:\windows\system32\where.exe' (PID: 2792) started
Waiting for process to exit ...
C:\Windows\System32\where.exe

And after printing that it waits forever. Log indicates just

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00:01:29.510 Executing guest process "c:\windows\system32\where.exe" as user "build" ...
00:01:29.620 Guest process (PID 2792) started

Though the process PID 2792 exited long ago.

I guess #8235 should be reopened.