New iMac running Sierra 10.12.5. 3 days ago suddenly started freezing intermittently for 3-5 minutes at a time. Activity Monitor was showing CPU spikes that corresponded to the freezes. Console reported some push spawn incidents. I pasted code into Terminal to get system report. The output is too long to paste here, but I have pasted into pastebin. Shortly after that, the computer froze and crashed. Tried to shut down, but it froze on shut down so I had to turn it off.
Restarted in safe mode. Seemed okay, so I started up Chrome - which at once reported that it had not shut down properly and began to act very unstable, flickering and loading from bottom over and over. I quit Chrome, uninstalled it and downloaded it, then reinstalled. But on opening it, it repeated the same bizarre behaviour.
In the meantime, Console system log shows:
Jun 11 03:58:44 iMac com.apple.xpc.launchd (com.apple.watchdogd): >Service only ran for 0 seconds. Pushing respawn out by 10 seconds. Jun 11 03:58:54 iMac Console: BUG in libdispatch client: >kevent[EVFILT_MACHPORT] monitored resource vanished before the source >cancel handler was invoked Jun 11 03:58:54 iMac com.apple.xpc.launchd (com.apple.watchdogd): >Service exited with abnormal code: 255 Jun 11 03:58:54 iMac com.apple.xpc.launchd (com.apple.watchdogd): >Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
And it was constantly repeating the same thing.
Crash log shows:
Process: Google Chrome  Path: /Applications/Google >Chrome.app/Contents/MacOS/Google Chrome Identifier: com.google.Chrome Version: 58.0.3029.110 (3029.110) Code Type: X86-64 (Native) Parent Process: ???  Responsible: Google Chrome  User ID: 501
Date/Time: 2017-06-08 23:53:55.944 +0800 OS Version: Mac OS X 10.12.5 (16F73) Report Version: 12 Anonymous UUID: B346C290-BA5B-BE25-2627-258EB9202EB0
Sleep/Wake UUID: 09EEC28F-8E0C-41B3-8428-51BCC9E7DD6B
Time Awake Since Boot: 70000 seconds Time Since Wake: 13000 seconds
System Integrity Protection: enabled
Crashed Thread: 0 CrBrowserMain Dispatch queue: com.apple.main->thread
Exception Type: EXC_BAD_INSTRUCTION (SIGILL) Exception Codes: 0x0000000000000001, 0x0000000000000000
There's more to the crash log, but it's too long to put here.
What is causing the freezing? How can I uninstall Chrome and put things right again?
Also deleted Chrome & Chrome folder in
Application Support/Google. Before I can reinstall Chrome, Console is continuing to report pushing:
respawn: Jun 11 10:29:55 iMac com.apple.xpc.launchd (com.apple.quicklook): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.quicklook Jun 11 10:29:57 iMac com.apple.xpc.launchd (com.apple.watchdogd): Service exited with abnormal code: 255 Jun 11 10:29:57 iMac com.apple.xpc.launchd (com.apple.watchdogd): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.