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Pianoworldstage

macrumors member
Original poster
Jul 3, 2019
67
7
Hi

Is it possible Apple software updates can somtimes contain bugs? I recently installed updates for OS Mojave and soon found my Macbook Pro started behaving differently.
 
Is it possible Apple software updates can somtimes contain bugs?
Definitely possible, and not uncommon.

Seems to happen more often now than before, but this has been going on forever. Updates typically fix some bugs, but sometimes adds some new one.


There has been some updates that had catastrophic bugs. I remember one, I think it was Snow Leopard, that would somehow deleted secondary profiles on a Mac with multiple users. This kind is extremely rare though.
 
I suppose the only way then to remove bugs from the system is to reformat the drive and perform a fresh install of the OS?
 
I suppose the only way then to remove bugs from the system is to reformat the drive and perform a fresh install of the OS?
If it is a bug, then there really isn't anything you can do except go back to a previous patch.

If your OS is corrupt, which is different than what is typically referred to as "bug", then that would be an appropriate way of handling.

It is not typical for an update to corrupt the system. But corruption of the system isn't uncommon and might be your issue.

Before going on, let use know more about your Mac, like model and specs please.
 
The latest couple Mojave updates seem to be bricking my MBP today. I can’t shut down or restart after trying to do the update, which stalled midway through. The only way I can shut the machine down now is by hard shutdown.
 
The latest couple Mojave updates seem to be bricking my MBP today. I can’t shut down or restart after trying to do the update, which stalled midway through. The only way I can shut the machine down now is by hard shutdown.

I just had the same issue today with the latest security update. The update was stuck for a long time. I had to force shut-down and my Mac mini behaved weirdly upon restarting.

Apps wouldn't launch, stuck mouse pointer etc., overall system speed down to a crawl. Had to restart and re-download the update and it worked after two more restarts.

Never had an issue with my Mac before (ran 10.14.6 for months).

It finally worked, but I would advise not to update for now and wait a few days.

This latest update caused the problem for me (just released on Nov 12, 2020):

Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave


PS: Apple already pulled an update for Mojave some weeks ago after similar issues were reported:

 
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I installed Security Update 2020-06 earlier today, and it completely bricked my iMac running Mojave. Apps took forever to open. Fortunately, I had a cloned SuperDuper backup and I restored my computer to a running state. I've never before had such a major problem with an Apple update. I know Apple pulled a previous security update, but this one seems just as bad.
 
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Mine finally completed after several disturbing hard shutdowns. Things seem ok for now. Not a good update and I concur, others should hold off for now (though they probably won’t come looking for this thread until they encounter the same issues).
 
Looks like a general issue with Security Update 2020-006 then (on 10.14.6).

All looks fine again for me as well now.

I hope Apple steps up its QA on updates for older systems.

There are good reasons for many users to stay on 10.14 or 10.15 for now because of frequently used software or workflows.
 
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Mac Pro 5.1 with Mojave 10.14.6 here. No problems after security update 2020-006, everything seems to work fine. Only difference: my Kryom Evo NVME PCI adapter with Intel 1TB SSD changed on the desktop from a yellow external disk to a grey internal disk...
 
I also have the latest security update installed on my Mac Pro 5,1. It's fine.
Screenshot 2020-11-13 at 07.28.34.png


Screenshot 2020-11-13 at 07.51.06.png
 
I installed Security Update 2020-06 earlier today, and it completely bricked my iMac running Mojave. Apps took forever to open. Fortunately, I had a cloned SuperDuper backup and I restored my computer to a running state. I've never before had such a major problem with an Apple update. I know Apple pulled a previous security update, but this one seems just as bad.
There was an issue with Apple's servers , now fixed, according to Engadget:
Google News had an article, actually a link to:
which shows some to many users had slow downs due to an Apple server overload.
So, that may have been the cause in your case, rather than the 006 update.

My system shows a Supplemental Update as well as a Security Update 006.
What is in the Supplemental Update?
 
Ok, maybe the two things (Gatekeeper server trouble and performing a 2020-006 update) were interlinked today and there is no issue after tomorrow.

Could be bad timing.

My issues today just reminded me of the earlier 2020-005 security update woes for 10.14 a few weeks ago (later pulled by Apple); details and link here:


Let´s hope that the 2020-006 update itself has no issues.
 
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I just had the same issue today with the latest security update. The update was stuck for a long time. I had to force shut-down and my Mac mini behaved weirdly upon restarting.

Apps wouldn't launch, stuck mouse pointer etc., overall system speed down to a crawl. Had to restart and re-download the update and it worked after two more restarts.

Never had an issue with my Mac before (ran 10.14.6 for months).

It finally worked, but I would advise not to update for now and wait a few days.

This latest update caused the problem for me (just released on Nov 12, 2020):

Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave


PS: Apple already pulled an update for Mojave some weeks ago after similar issues were reported:

Should pull this one too. Installed and many apps wouldn’t work. Only solution was to reinstall the os. Getting sick of this shabby qc. Unbelievable for a company like Apple. As we say in this part of rural Ontario...all show and no go!
 
Before going on, let use know more about your Mac, like model and specs please.

I reformatted the drive and performed a factory reset, uninstalled the OS and made a fresh install of OS Mojave.

My Macbook Pro is now 100% clean and running like a dream.. no more updates anymore.

Macbook Pro mid 2012, 8GB RAM, 250GB SSD, OS Mojave.
 
I reformatted the drive and performed a factory reset, uninstalled the OS and made a fresh install of OS Mojave.

My Macbook Pro is now 100% clean and running like a dream.. no more updates anymore.

Macbook Pro mid 2012, 8GB RAM, 250GB SSD, OS Mojave.
Great that you figured it out.

Based off of the other comments on the thread, there might that been something going on with the update server leading to corruption. It is rare, but it happens.

That is probably what you experienced.

If the corruption comes back, then there could be something else going on, but if everything is running great, you are probably in the clear.

Goodluck!
 
I reformatted the drive and performed a factory reset, uninstalled the OS and made a fresh install of OS Mojave.

My Macbook Pro is now 100% clean and running like a dream.. no more updates anymore.

Macbook Pro mid 2012, 8GB RAM, 250GB SSD, OS Mojave.
I'm about to reformat and fresh install Mojave too - did you ignore or install the security updates?
 
Definitely! ignored updates..

As mentioned, after reformatting the drive and performing a fresh install of the OS everything is back to normal, running clean and smooth, updates, never again.
 
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I didn't update and experienced the slowdown to a crawl thing, I thought my SSD had bricked. 100% cpu usage with trustd process overall. Shut down and waited for hours. Now working as usual.
 
@davidlv, I was just about to post what you found. Ars Technica had a similar article here:

https://arstechnica.com/gadgets/202...-temporary-slowdown-in-even-non-big-sur-macs/

This seems to be exactly what I was experiencing. When I ran activity monitor, it showed a lot of activity for trustd, a process that checks an app for notarization by contacting Apple's servers. I'm still going to wait before updating again.
Thought my iMac was bricked, now I understand!

I've restored a TM backup for absolutely nothing. I should had checked here before...

It happened thursday for me.
 
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