Hello, i got the same problem with EC GM
Macbook Pro Retina 15" 2015
Update from Yosemite, was fine, then rebooted and now i am stuck at boot.
i run your commands above, and there is my output.
i will be happy if you can help me.
-bash-3.2# cd /Volumes ; ls -1
.Trashes
Macintosh HD
OS X Base System
-bash-3.2# cd "Macintosh HD"
-bash-3.2# find System/Library/Extensions -ctime +12w -depth 2
System/Library/Extensions/3Dconnexion.kext/Contents
System/Library/Extensions/EyeTVAfaTechHidBlock.kext/Contents
System/Library/Extensions/EyeTVCinergy450AudioBlock.kext/Contents
System/Library/Extensions/EyeTVCinergyXSAudioBlock.kext/Contents
System/Library/Extensions/EyeTVEmpiaAudioBlock.kext/Contents
System/Library/Extensions/EyeTVVoyagerAudioBlock.kext/Contents
System/Library/Extensions/JMicronATA.kext/Contents
System/Library/Extensions/NikeSportWatch.kext/Contents
-bash-3.2# tail -30 var/log/system.log
Oct 1 17:35:19 Mighty mdworker[2366]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2329]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2369]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2368]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2367]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2515]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2533]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2516]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[1502]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2126]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2127]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2125]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2436]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2806]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2437]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2470]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty mdworker[2499]: (ImportBailout.Error:1325) Asked to exit for Diskarb
Oct 1 17:35:19 Mighty kernel[0]: hfs: unmount initiated on Recovery HD on device disk0s3
Oct 1 17:35:19 Mighty com.apple.kextd[46]: / is still busy, delaying reboot.
Oct 1 17:35:19 Mighty com.apple.kextcache[4135]: Lock acquired; proceeding.
Oct 1 17:35:19 Mighty com.apple.kextcache[4135]: /: helper partitions appear up to date.
Oct 1 17:35:19 Mighty com.apple.kextd[46]: up to date; unblocking reboot.
Oct 1 17:35:19 Mighty shutdown[4133]: reboot by lost:
Oct 1 17:35:19 Mighty kernel[0]: Kext loading now disabled.
Oct 1 17:35:19 Mighty kernel[0]: Kext unloading now disabled.
Oct 1 17:35:19 Mighty kernel[0]: Kext autounloading now disabled.
Oct 1 17:35:19 Mighty kernel[0]: Kernel requests now disabled.
Oct 1 17:35:19 Mighty shutdown[4133]: SHUTDOWN_TIME: 1443713719 781114
Oct 1 17:35:19 Mighty kernel[0]: Process launchd [1] disabling system-wide I/O Throttling
Oct 1 17:35:19 Mighty kernel[0]: Process launchd [1] disabling system-wide CPU Throttling
-bash-3.2#