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Constant high CPU after Security Update today

I installed the Security Update that was made available today. Now, I have constant high CPU from a process called 'MRT'. In the Console Log, I see the following:

5/31/11 8:28:26 PM com.apple.launchd[1] (com.apple.mrt) Throttling respawn: Will start in 1 seconds

5/31/11 8:28:36 PM com.apple.launchd[1] (com.apple.mrt[57302]) Exited with exit code: 4

5/31/11 8:28:36 PM com.apple.launchd[1] (com.apple.mrt) Throttling respawn: Will start in 1 seconds

5/31/11 8:28:46 PM com.apple.launchd[1] (com.apple.mrt[57306]) Exited with exit code: 4

5/31/11 8:28:46 PM com.apple.launchd[1] (com.apple.mrt) Throttling respawn: Will start in 2 seconds

5/31/11 8:28:56 PM com.apple.launchd[1] (com.apple.mrt[57308]) Exited with exit code: 4

5/31/11 8:28:56 PM com.apple.launchd[1] (com.apple.mrt) Throttling respawn: Will start in 3 seconds

5/31/11 8:29:06 PM com.apple.launchd[1] (com.apple.mrt[57314]) Exited with exit code: 4

5/31/11 8:29:06 PM com.apple.launchd[1] (com.apple.mrt) Throttling respawn: Will start in 3 seconds

5/31/11 8:29:19 PM com.apple.launchd[1] (com.apple.mrt[57315]) Exited with exit code: 4

5/31/11 8:29:19 PM com.apple.launchd[1] (com.apple.mrt) Throttling respawn: Will start in 1 seconds

5/31/11 8:29:28 PM com.apple.launchd[1] (com.apple.mrt[57323]) Exited with exit code: 4

5/31/11 8:29:28 PM com.apple.launchd[1] (com.apple.mrt) Throttling respawn: Will start in 3 seconds

5/31/11 8:29:38 PM com.apple.launchd[1] (com.apple.mrt[57327]) Exited with exit code: 4

5/31/11 8:29:38 PM com.apple.launchd[1] (com.apple.mrt) Throttling respawn: Will start in 3 seconds

5/31/11 8:29:50 PM com.apple.launchd[1] (com.apple.mrt[57329]) Exited with exit code: 4

5/31/11 8:29:50 PM com.apple.launchd[1] (com.apple.mrt) Throttling respawn: Will start in 2 seconds


For the good portion of this afternoon into this evening, I've been running at about 80%+ CPU utilization with MRT being the offender based on watching 'top' and Activity Monitor. Anyone else seeing something similar?

MacBook Pro, Mac OS X (10.6.7)

Posted on May 31, 2011 5:35 PM

Reply
105 replies

Aug 25, 2017 6:22 PM in response to Gallo65

Recommend you start or join a new discussion in the El Capitan Forum for this one.


Although both those files should be present, there was no update to MRT for El Capitan users, so there must be something else going on here.


Wondering why you haven't updated to 10.11.6 and Security Update 2017-003 (El Capitan)? They contain dozens up bug fixes and security patches,

Aug 25, 2017 11:00 AM in response to ryanmoffett1

I had the same issue and this is how i solved it.


  1. shut down your mac. boot it in safe mode by pressing and holding down control + alt + R.
  2. open terminal and disable security by $: csrutil disable; reboot
  3. when it boots normally: open terminal and type $: sudo launchctl unload /System/Library/LaunchDaemons/com.apple.MRTd.plist
  4. then $: sudo rm -R /System/Library/CoreServices/MRT.app
  5. You will be good to go.

Aug 25, 2017 6:08 PM in response to MrOnyancha

Several issues with your reply here.


The OP introduced this problem over six years ago, so certainly not the same issue.


This is the Snow Leopard forum, so none of your recommendations are applicable to OS X 10.6.x


<Command>-R does not give you a "Safe Boot", rather it boots you into the Recover HD.


Neither of those files you removed are found in Snow Leopard and the only MRT update was only for macOS 10.12 and above.

May 31, 2011 7:32 PM in response to ryanmoffett1

Here's a tiny bit more info from system.log (in bold):


May 31 22:22:29 rymoffet-mac MRT[444]: Error: SMJobRemove: The operation couldn’t be completed. (kSMErrorDomainFramework error 4 - There was an error in the Authorization subsystem.)

May 31 22:22:30 rymoffet-mac com.apple.launchd[1] (com.apple.mrt[444]): Exited with exit code: 4

May 31 22:22:30 rymoffet-mac com.apple.launchd[1] (com.apple.mrt): Throttling respawn: Will start in 5 seconds

May 31 22:22:40 rymoffet-mac MRT[445]: Error: SMJobRemove: The operation couldn’t be completed. (kSMErrorDomainFramework error 4 - There was an error in the Authorization subsystem.)

May 31 22:22:41 rymoffet-mac com.apple.launchd[1] (com.apple.mrt[445]): Exited with exit code: 4

May 31 22:22:41 rymoffet-mac com.apple.launchd[1] (com.apple.mrt): Throttling respawn: Will start in 5 seconds

May 31 22:22:51 rymoffet-mac MRT[446]: Error: SMJobRemove: The operation couldn’t be completed. (kSMErrorDomainFramework error 4 - There was an error in the Authorization subsystem.)

May 31 22:22:51 rymoffet-mac com.apple.launchd[1] (com.apple.mrt[446]): Exited with exit code: 4

May 31 22:22:51 rymoffet-mac com.apple.launchd[1] (com.apple.mrt): Throttling respawn: Will start in 5 seconds


I have run a full repair on disk permissions but it hasn't resolved this issue. SMJobRemove seems to be an SDK function for removing a job from the Service Manager based on a simple search I did. However, I can't see what would be causing this particular error. Everything else was working fine (and still is, except this MRT problem that started today).

Jun 1, 2011 2:51 AM in response to ryanmoffett1

Hi,

I had the same issue. I removed the 2 launchd plist files used to start mrt:


rm /System/Library/LaunchDaemons/com.apple.mrt.plist

rm /System/Library/LaunchAgents/com.apple.mrt.uiagent.plist


I then rebooted, and cpu is back to normal. Mrt is not launched on stratup.

It is ridiculous that Apple releases a security update without testing it.


Cheers,

Alex

Constant high CPU after Security Update today

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