MRT

Uninstall CleanMyMac per their directions , then run etrecheck again to see what chaff it left...

On CMM…

https://discussions.apple.com/thread/251370955?answerId=252661013022#252661013022

https://discussions.apple.com/thread/251442443?answerId=252814053022#252814053022

https://discussions.apple.com/thread/251464557?answerId=252841819022#252841819022

https://discussions.apple.com/thread/251889446?answerId=253629452022#253629452022

This thread had already discussed the issue in detail. The MRT app keeps crashing, and restarts. I have the same problem. We need to wait for apple to make a fix, or you disable system integrity protection and rename the MRT.app file to something else.

https://discussions.apple.com/thread/251941776?answerId=253705240022#253705240022

Can you get us a report?

We might find the problem with an etrecheck report.

EtreCheck is a FREE simple little diagnostic tool to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac. It will not display any personal info.

https://www.etrecheck.com/

Pastebin is a good place to paste the whole report if you capture the URL while there…

https://pastebin.com/

Whew, they've changed pastebin & made it harder, but after pasting in, click Create new paste button, then Embed button, then copy the URL...

<script src="https://pastebin.com/embed_js/KuvnghqA"></script>

The important part is...

https://pastebin.com/embed_js/KuvnghqA

Workable but harder for me to work with...the Note tool on the bottom of this editor's toolbar, as shown in the image, to copy and paste the output from EtreCheck. In a Reply before you click post, look for this to add longer texts...

Me and a few other people are experiencing the same problem right now. I'm running El Capitan but people with different OS versions are facing the same issue. My plan is to revert back to a previous back up and cancel automatic updates for the time being because this CPU spike started happening right after the MRT 1.68 update.

OK, good to know CMM is problematic. I'm always wary of these types of apps. So, upon quick inspection, launchd writes are slower after CMM removal and reboot:

https://pastebin.com/zxv4MaEG

MRT is still often >100% after an hour of booting up in Safe Mode. It ran during all that time. I'm not sure if MRT inspects mounted volumes as well. I have a RAID that might take some time.

Anyway, keeping an eye on it.

This has started happening to me also, el Capitan. MRT is going nuts in activity monitor. Installed TotalAV recently and did all scans and said no problems found but then tried the free version of malwarebytes but wasn't able to install it...and now something called 'com.jdi.ss.SSHelper' is popping up in activity monitor also? Did another reboot and now am able to re-run full scan with TotalAV...never had issues with MRT before today.

I think TotalAV is the problem, 'com.jdi.ss.SSHelper' is part of Total AV.

Not that I\m recommending MacRemove, but some instructions on that site.

https://macremover.com/uninstallguides/2018/01/31/remove-totalav-macos/

Yes thanks, 'com.jdi.ss.SSHelper' is part of TotalAV, when I turn off totalAV MRT calms down a bit, but not totally. Was concerned as saw online that if MRT starts going nuts then its looking for malware?? Kinda defeats the purpose that if you run software to try and find any viruses it slows down the whole machine. I'm also thinking me trying to install Malwarebytes to see if TotalAV missed anything was maybe blocked from installing by TotalAV. Anyway will try and disable MRT until apple do a fix as the good people on here suggest. thanks.

Hi Dan. Where is MRT.app located? I can't find it.

Also, the Console has multiples of these:

2020-10-23 9:14:52.223 AM MRT[42922]: SecStaticCode: verification failed (trust result 7, error -2147409652)

Oops, found it, in a crash report for MRT:

Process:               MRT [42922]
Path:                  /System/Library/CoreServices/MRT.app/Contents/MacOS/MRT
Identifier:            MRT
Version:               1.68 (1)
Code Type:             X86-64 (Native)
Parent Process:        launchd [1]
Responsible:           MRT [42922]
User ID:               <snip>

Date/Time:             2020-10-23 09:15:35.342 -0400
OS Version:            Mac OS X 10.11.6 (15G22010)
Report Version:        1159000 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_CRASH (SIGABRT)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Application Specific Information:
*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSRegularExpression enumerateMatchesInString:options:range:usingBlock:]: Range or index out of bounds'
terminating with uncaught exception of type NSException
abort() called

https://discussions.apple.com/thread/251941776?answerId=253705240022#253705240022

I've got the same issue. My computer's fans don't go crazy, but it is constantly at around 70-100% utilisation, crashes, and then reopens. It drained my battery all today and yesterday

El Capitan here, >100% (4 cores).

Etrecheck: https://pastebin.com/yYNbY61M

I might start up in safe mode to see if it ends the MRT. But that should be overnight.

Any advice appreciated.

Dan, that is pretty unreadable here, but I see you have Norton installed, I'd uninstall it per their directions & run etrecheck again with some other method to pst the results. :)