VirtualBox hangs on FreeBSD 10-stable and then reports error

[Graham Menhennitt]

I've been successfully running VirtualBox for some time. Last week I
updated my /usr/src/ and /usr/ports, built & installed world and kernel,
and did portupgrade -a. Now VirtualBox won't start - it doesn't even
show the window with the list of VMs. I've tried as root and as myself.
I've also tried removing my .virtualbox directory. kldstat shows
vboxdrv.ko is loaded. I've rebooted after building and installing
everything. I have the QT4 port config option selected.

I've run it in truss as root and the bzipped output file is at
http://menhennitt.com.au/truss.bz2. It runs for a few seconds and then
gets to the point in the truss output (around line 2890) where it does
the stuff shown below. It repeats the last poll() line at 5 second
intervals for about 5 minutes. It then shows a dialog:
    Failed to create the VirtualBox COM object.
    The application will now terminate.
    Callee RC: NS_ERROR_FACTORY_NOT_REGISTERED (0x80040154)
When I click Ok in the dialog, it exits.

It's virtualbox-ose-4.3.26 and virtualbox-ose-kmod-4.3.26 on FreeBSD
10-stable from last week on amd64.

Does anybody please have any clues?

Thanks,
    Graham


open("/etc/spwd.db",O_CLOEXEC,00)                = 16 (0x10)
fstat(16,{ mode=-rw------- ,inode=33147405,size=40960,blksize=32768 }) =
0 (0x0)
read(16,"\0\^F\^Ua\0\0\0\^B\0\0\^D\M-R\0"...,260) = 260 (0x104)
pread(0x10,0x801e89000,0x1000,0x6000,0x1,0x0)    = 4096 (0x1000)
pread(0x10,0x801e8a000,0x1000,0x4000,0x1,0x0)    = 4096 (0x1000)
close(16)                                        = 0 (0x0)
connect(15,{ AF_UNIX "/tmp/.vbox-root-ipc/ipcd" },106) ERR#61
'Connection refused'
close(15)                                        = 0 (0x0)
pipe(0x7fffffff4570)                             = 0 (0x0)
fcntl(15,F_SETFD,FD_CLOEXEC)                     = 0 (0x0)
fcntl(16,F_SETFD,FD_CLOEXEC)                     = 0 (0x0)
fcntl(15,F_GETFD,)                               = 1 (0x1)
fcntl(15,F_GETFL,)                               = 2 (0x2)
fcntl(15,F_SETFL,O_NONBLOCK|0x2)                 = 0 (0x0)
fcntl(16,F_GETFD,)                               = 1 (0x1)
fcntl(16,F_GETFL,)                               = 2 (0x2)
fcntl(16,F_SETFL,O_NONBLOCK|0x2)                 = 0 (0x0)
fcntl(16,F_SETFD,0x0)                            = 0 (0x0)
openat(0xffffff9c,0x81054f561,0x2,0x0,0x80,0xfe1bfed8) = 17 (0x11)
fcntl(17,F_GETFD,)                               = 0 (0x0)
openat(0xffffff9c,0x7fffffff2a80,0x100000,0x0,0x7ff7fed5c75a,0x8080808080808080)
ERR#2 'No such file or directory'
openat(0xffffff9c,0x7fffffff2f20,0x100000,0x0,0x7ff7fed5c75a,0x8080808080808080)
ERR#2 'No such file or directory'
openat(0xffffff9c,0x7fffffff2a80,0x100000,0x0,0x7ff7fed5c75a,0x8080808080808080)
ERR#2 'No such file or directory'
openat(0xffffff9c,0x7fffffff2f20,0x100000,0x0,0x7ff7fed5c75a,0x8080808080808080)
ERR#2 'No such file or directory'
access("/usr/local/lib/virtualbox/VBoxXPCOMIPCD",1) = 0 (0x0)
sigprocmask(SIG_BLOCK,SIGHUP|SIGINT|SIGQUIT|SIGILL|SIGTRAP|SIGABRT|SIGEMT|SIGFPE|SIGKILL|SIGBUS|SIGSEGV|SIGSYS|SIGPIPE|SIGALRM|SIGTERM|SIGURG|SIGSTOP|SIGTSTP|SIGCONT|SIGCHLD|SIGTTIN|SIGTTOU|SIGIO|SIGXCPU|SIGXFSZ|SIGVTALRM|SIGPROF|SIGWINCH|SIGINFO|SIGUSR1|SIGUSR2,SIGALRM)
= 0 (0x0)
fork()                                           = 51627 (0xc9ab)
sigprocmask(SIG_SETMASK,SIGALRM,0x0)             = 0 (0x0)
SIGNAL 20 (SIGCHLD)
sigprocmask(SIG_SETMASK,SIGALRM|SIGCHLD,0x0)     = 0 (0x0)
write(11,"\0",1)                                 = 1 (0x1)
sigreturn(0x7fffffff2b60,0x7fffffff2b60,0x301,0x0,0xfffffffffffffbc0,0x7fffffff3278)
= 0 (0x0)
wait4(51627,{ EXITED,val=0 },0x0,0x0)            = 51627 (0xc9ab)
close(17)                                        = 0 (0x0)
close(16)                                        = 0 (0x0)
read(15,0x7fffffff45af,1)                        ERR#35 'Resource
temporarily unavailable'
poll({15/POLLIN|POLLPRI},1,5000)                 = 0 (0x0)
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