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Level 1

13 points

CPU going crazy with MRT after the update.

After the MRT update v. 1.68 my mid 2011 iMac is going insane with CPU percentages hitting %180s with MRT on Activity Monitor. Running El Capitan and tried resetting NVRAM and PRAM. Nothing worked besides formatting the hard disc and restoring from a previous back up that was done 2 weeks ago. However, MRT got updated a few hours later and I am back where I started. I also ran a few malware scans but those did not find anything suspicious. Would greatly appreciate any help, thanks!

Posted on Oct 21, 2020 3:59 AM

Best reply

Peter石

Level 1

9 points

Posted on Oct 21, 2020 9:13 AM

I got same issue. MRT just keep up and down and my CPU like crazy.

Since I got no Time Machine backup to downgrade MRT 1.68 to 1.67, I tried rename MRT.app to MRT.app.bak

And it works! My CPU now is calm.

path:

/Library/Apple/System/Library/CoreServices/MRT.app

You may need to disable SIP so you can rename MRT.app.

This is not a final solution. Hope Apple could fix it ASAP.

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43 replies

Peter石

Level 1

9 points

Oct 22, 2020 12:11 AM in response to LoudCloudDragon

Actually that MRT.app process is just keep crash and crash every couple seconds, you will notice that the PID of MRT.app process is keep re-new. So it never in "operational state".

yastam

Level 1

4 points

Oct 22, 2020 12:42 AM in response to LoudCloudDragon

These general maintenances could not solve this MRT issue for me.

yastam

Level 1

4 points

Oct 22, 2020 12:45 AM in response to LoudCloudDragon

Yes, this is a temporary workaround until Apple fixes the MRT.

Oct 22, 2020 1:40 AM in response to Peter石

Good to know. Sadly my Mojave computer just re-generated it...

Oct 23, 2020 2:23 AM in response to niklas294

Hopefully somebody will report this and get the logs. I gave up and just renamed it. I don't quite have the time.

Tom AdS

Level 1

4 points

Oct 24, 2020 11:54 AM in response to stackr

The actual Version of MRT by softwareupdate is now again:

MRTConfigData_10_15-1.67

v1.68 seems to be withdrawn by Apple ...

THX

Oct 25, 2020 12:46 PM in response to Tom AdS

Disablng executable permission didn't work here. I went ahead and removed this. If apple release a fixed versoin later on, it will probably be put back into place.