Guessing you are talking about upgrading to 10.2.x from 10.1.x? After backing up (and preferably taking an image of your drive for quick restoration), feel free, the water in 10.2 is fine....
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Apple Releases Supplemental Security Update for OS X El Capitan
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Guessing you are talking about upgrading to 10.2.x from 10.1.x? After backing up (and preferably taking an image of your drive for quick restoration), feel free, the water in 10.2 is fine....
Installed this on my 2015 rMBP - I walked away while it was installing, came back about 15 minutes later to a black screen, hit the trackpad and got the colored pinwheel. Waited 10 minutes and nothing but the colored wheel. Powered off and on, login screen appeared, and I entered my password. Then the "spoked" wheel appeared and stayed. I left it for 15 minutes with no change. Powered off, booted in safe mode, tried to login and got the spoked wheel again.
Started some Googling and eventually followed the procedure here: https://discussions.apple.com/thread/7428876?tstart=0 (thank goodness I had an Administrator account set up). Used Terminal to delete the 4 files and then restarted. After that my login went fine.
Started some Googling and eventually followed the procedure here: https://discussions.apple.com/thread/7428876?tstart=0 (thank goodness I had an Administrator account set up). Used Terminal to delete the 4 files and then restarted. After that my login went fine.
Once again Mac users are being dealt the short hand. OS X Mavericks is not old and only second to Snow Leopard in later releases for stability.
There are those who choose to remain on OS X Mavericks and Apple should respect that decision by continuing to offer support.
Holy crap, this was APPLE'S fault?? I've been banging my head against this problem for weeks now, trying to figure out what "kernel task" could possibly be demanding 95% of my 2012 rMBP's resources. 
So you would prefer it if Apple were not to release security updates yes?Ugh, ANOTHER security update? Can't apple EVER get ANYTHING right?
Holy crap, this was APPLE'S fault?? I've been banging my head against this problem for weeks now, trying to figure out what "kernel task" could possibly be demanding 95% of my 2012 rMBP's resources.
Not sure about others' experience here, but not only has this not fixed my kernel_task errors, but now I'm experiencing even more memory/CPU headaches. Every hour or so almost all of my apps will become unresponsive, they can't be brought to the front or quit normally. If I force quit them then I can easily open them again, so it's not an issue with total load on the system (2012 rMBP/16GB/750GB with 120GB free). I've already run fsck and other housecleaning tasks and restarted multiple times. I'm about to throw this *&$% computer out the window.
I was only seeing the problem every other day or so, but haven't seen it (or any of the problems you're encountering) since I installed the update. Also have not seen as many kernel complaints in the system log since the update.
It killed my 2012 MBPro. After install got slow logon, apps hung, got kernel and log taking up major CPU, did that twice and now after reboot got the gray folder and question mark. Disk not found in recovery. Put a known good disk in, not found! Tried pram and smc reset - no luck! This patch killed my system!
These computers are very prone to failure of the cable that connects the disk to the computer. It seems likely that's the problem you're having, not related to this update.
It seems crazy that a cable would just fail - it's not being flexed, not moved - why would it fail? I hope that is it - because otherwise this patch is a real killer!
The cable is flat and rubs against the bottom of the computer. As the computer flexes during use or when being transported, the metal can damage the plastic insulation on the cable.
Replaced the SATA cable - works fine again. Wow - never had a SATA cable fail before. It looked perfect condition - must have been invisible damage.
So that's what's ben happening!
I was about to format my Mac.
I'm going to install the update and see if performance is restored.
Glad to hear it's fixed. Unfortunately this is a pretty common problem on these computers.
Does the supplemental update merely fix something in the original update and leave the build # alone or does it change the build # again?
It had a new build # (15G1217). As to whether it "merely fixed something in the original update" who knows - Apple rarely tells all. It fixed the problem the original update caused (at least on my machine), but it might have included other tweaks/fixes as well.