id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host
17837,VirtualBox OS X,Herb Siegel,,"VirtualBox VM 5.2.12 r122591 win.amd64 (May 9 2018 10:42:46) release log

Unable to get OS X virtual machine to fully initialize. It stops loading during boot up as it reads Extensions.mkext

Loading System\Library\Caches\com.apple.ktext.caches\Startup\Extensions.mkext
.........................................................................................................

Here's the tail end of the vbox.log - 
00:00:41.667342 VGA Graphics Controller (3CF): GR index 3CE:08
00:00:41.667343  GR00:00 GR01:00 GR02:00 GR03:00 GR04:00 GR05:40 GR06:05 GR07:0F GR08:FF
00:00:41.667347 !!
00:00:41.667348 !! {vgapl}
00:00:41.667348 !!
00:00:41.667349 read mode     : 0     write mode: 0
00:00:41.667350 set/reset data: 00    S/R enable: 00
00:00:41.667351 color compare : 00    read map  : 0
00:00:41.667352 rotate        : 0     function  : 0
00:00:41.667353 don't care    : 0F    bit mask  : FF
00:00:41.667354 seq plane mask: 0F    chain-4   : on
00:00:41.667355 !!
00:00:41.667356 !! {vgasr}
00:00:41.667356 !!
00:00:41.667357 VGA Sequencer (3C5): SR index 3C4:00
00:00:41.667358  SR00:03 SR01:01 SR02:0F SR03:00 SR04:0A SR05:00 SR06:00 SR07:01
00:00:41.667361 !!
00:00:41.667362 !! {vgatext}
00:00:41.667362 !!
00:00:41.667363 Not in text mode!
00:00:41.667364 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
00:00:41.667425 emR3Debug: rc=VERR_PGM_HANDLER_VIRTUAL_CONFLICT
",defect,closed,other,VirtualBox 5.2.12,invalid,,,OSX Server,other