Late 2015 iMac 5K Crashing

[pwgsy]

Hi,

New here as I've been getting constant crashes on my iMac which is about 2 years old.

The logs are showing the following just before the crash:

Aug 19 18:42:00 Pauls-iMac com.apple.xpc.launchd[1] (com.apple.preferences.icloud.remoteservice[2313]): Service exited due to signal: Killed: 9 sent by com.apple.preferences.icloud.rem[2313]
Aug 19 18:42:02 Pauls-iMac com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Aug 19 18:42:33 --- last message repeated 2 times ---
Aug 19 18:42:33 Pauls-iMac com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Aug 19 18:42:33 Pauls-iMac com.apple.xpc.launchd[1] (com.apple.WebKit.Networking.2DD83767-A01C-47E1-A5DE-09EE8423EF7C[2349]): Service exited with abnormal code: 1
Aug 19 18:42:57 Pauls-iMac Finder[315]: BUG in libdispatch client: kevent[EVFILT_MACHPORT] monitored resource vanished before the source cancel handler was invoked
Aug 19 18:46:48 Pauls-iMac com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Aug 19 18:47:33 --- last message repeated 2 times ---
Aug 19 18:47:42 Pauls-iMac com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Aug 19 18:47:43 Pauls-iMac com.apple.xpc.launchd[1] (com.apple.WebKit.Networking.F0F1D849-5DD8-4D8B-AA4C-511CFBDB48EC[2360]): Service exited with abnormal code: 1
Aug 19 18:48:15 Pauls-iMac com.apple.xpc.launchd[1] (com.apple.ReportCrash[2361]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.ReportCrash
Aug 19 18:48:42 Pauls-iMac syslogd[50]: ASL Sender Statistics
Aug 19 18:52:52 localhost bootlog[0]: BOOT_TIME 1503165172 0

If anyone is able to see any issues there that might be resolvable, it would be immensely helpful. A bit worried it might be power unit or logic board issue based on searches I've conducted.

Thanks,
Paul

 

[Taz Mangus]

How often do the crashes happen? If you boot into safe mode do you still get crashes?

 

[pwgsy]

It can be several times per day if the computer is in heavy use. Haven't tried safe mode so will test that out later.

 

[ddmcnair]

There is not enough info in the OP's message. Which OS are you using? Are you using some type of iOS emulator. Sorry to say it, but we need more details. Also when was the last time it ran correctly, and do you have a Time Machine backup?

 

[pwgsy]

It's Sierra 10.12.6
There are no emulators, there is a boot camp partition but it's not in use. The crashes have been happening for about a week and it will happen every time the mac is used. Sometimes it will crash within a few minutes of logging in, others we'll get an hour or so before it crashes.

Hope that helps! Let me know if you need more!

 

[adib]

Try running Apple Hardware Test on it and see.

 

[pwgsy]

Try running Apple Hardware Test on it and see.

I tried that already once and it came up clean. I might try running it a few times to see if its an intermittent fault.

It is more prone to crash if it has been on for a while. Once it crashes, we have to unplug it for about 30 seconds for it to become responsive again. If we leave it plugged in the power button does nothing.

 

[Taz Mangus]

I tried that already once and it came up clean. I might try running it a few times to see if its an intermittent fault.

It is more prone to crash if it has been on for a while. Once it crashes, we have to unplug it for about 30 seconds for it to become responsive again. If we leave it plugged in the power button does nothing.

That could indicate a power supply issue. My suggestion is for you to take it into an Apple Store and have determine the issue as it might be hardware related. That is what I would do st this point.

Do you have ApppeCare for the computer?

 

[pwgsy]

That could indicate a power supply issue. My suggestion is for you to take it into an Apple Store and have determine the issue as it might be hardware related. That is what I would do st this point.

Do you have ApppeCare for the computer?

Thanks, I thought that was the case but as the store charge for just looking in your general direction I wanted to check for other possibilities!

No AppleCare, guessing it's too late to get it 2 years down the road!

 

[vkd]

A cheap trick might be to test the memory modules, take them out and put them back in one at a time, see if if makes a difference. Happened to me once, I thought it was the HDD failing but no it was a memory card.