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Latest macOS Mojave Update on my iMac 5K Wrecks Sleep Mode; iMac Wakes up Dozens of times a day

I run macOS Mojave on my 2019 iMac 5K (I will never “upgrade” the OS).

This iMac 5K has been the most reliable Mac I’ve ever used, excepting the 2012 MacBook Pro when used as a server. I know this particular iMac 5K of mine very well, exactly how it has performed for 2.5 years now.

I installed the latest macOS Mojave around September 30. Since then, my iMac 5K wakes up frequently out of sleep, sometimes as often as every 5 minutes, day or night. This is driving me crazy.

Checking the system logs, I am trying to determine what is causing the wakeups, but so far I am not sure.

Trust Apple to screw things up—every time there is an update, new bugs appear.

UPDATE Oct 20: damn Apple and their software engineering incompetence! The iMac 5K wakes itself up all night, every night (and day). My wife is complaining that it wakes her up if my office door is left open (it’s a bright screen!). My only solution, a very annoying one, is to shut the godamn thing down. This all started after Apple’s most recent security update.

Energy Saver preferences

System log

All I see in the system log is buggy Apple software being killed. But poorly-engineered and hardly-tested Apple system software polluting the log files has been the norm for many years.

Still, all the wakeupts look to be preceded by syslogd emitting ASL Sender Statistics.

Oct 20 11:33:33 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1C000000-0000-0000-0000-000000000000[18683]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 11:33:33 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1B000000-0000-0000-0000-000000000000[18727]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 11:33:33 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1A000000-0000-0000-0000-000000000000[18744]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 11:33:36 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1D000000-0000-0000-0000-000000000000[18743]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 11:33:45 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[18708]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 11:51:41 diglloyd-iMac syslogd[51]: ASL Sender Statistics
Oct 20 11:51:46 diglloyd-iMac xpcproxy[18862]: libcoreservices: _dirhelper_userdir: 529: bootstrap_look_up returned (ipc/send) invalid destination port
Oct 20 11:52:00 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1D000000-0000-0000-0000-000000000000[18837]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 11:52:12 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Oct 20 11:52:45 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[18865]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 11:54:43 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[19014]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 12:32:41 diglloyd-iMac syslogd[51]: ASL Sender Statistics
Oct 20 12:32:47 diglloyd-iMac xpcproxy[19104]: libcoreservices: _dirhelper_userdir: 529: bootstrap_look_up returned (ipc/send) invalid destination port
Oct 20 12:32:59 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1D000000-0000-0000-0000-000000000000[19075]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 12:33:45 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[19107]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 12:51:41 diglloyd-iMac syslogd[51]: ASL Sender Statistics
Oct 20 12:51:46 diglloyd-iMac xpcproxy[19232]: libcoreservices: _dirhelper_userdir: 529: bootstrap_look_up returned (ipc/send) invalid destination port
Oct 20 12:52:27 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1D000000-0000-0000-0000-000000000000[19207]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 12:52:27 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1A000000-0000-0000-0000-000000000000[19241]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 12:52:45 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[19237]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 12:54:43 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[19378]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 13:32:41 diglloyd-iMac syslogd[51]: ASL Sender Statistics
Oct 20 13:32:47 diglloyd-iMac xpcproxy[19453]: libcoreservices: _dirhelper_userdir: 529: bootstrap_look_up returned (ipc/send) invalid destination port
Oct 20 13:33:00 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1A000000-0000-0000-0000-000000000000[19424]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 13:33:45 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[19454]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 13:51:41 diglloyd-iMac syslogd[51]: ASL Sender Statistics
Oct 20 13:51:46 diglloyd-iMac xpcproxy[19584]: libcoreservices: _dirhelper_userdir: 529: bootstrap_look_up returned (ipc/send) invalid destination port
Oct 20 13:52:00 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1A000000-0000-0000-0000-000000000000[19558]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 13:52:12 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Oct 20 13:52:45 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[19587]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 13:54:43 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[19731]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 14:32:41 diglloyd-iMac syslogd[51]: ASL Sender Statistics
Oct 20 14:32:47 diglloyd-iMac xpcproxy[19832]: libcoreservices: _dirhelper_userdir: 529: bootstrap_look_up returned (ipc/send) invalid destination port
Oct 20 14:33:19 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1A000000-0000-0000-0000-000000000000[19806]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 14:33:45 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[19837]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 14:51:41 diglloyd-iMac syslogd[51]: ASL Sender Statistics
Oct 20 14:51:46 diglloyd-iMac xpcproxy[19932]: libcoreservices: _dirhelper_userdir: 529: bootstrap_look_up returned (ipc/send) invalid destination port
Oct 20 14:52:00 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1A000000-0000-0000-0000-000000000000[19908]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 14:52:45 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[19935]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 14:54:43 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[20076]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 15:32:41 diglloyd-iMac syslogd[51]: ASL Sender Statistics
Oct 20 15:32:46 diglloyd-iMac xpcproxy[20165]: libcoreservices: _dirhelper_userdir: 529: bootstrap_look_up returned (ipc/send) invalid destination port
Oct 20 15:33:33 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1A000000-0000-0000-0000-000000000000[20139]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 15:33:33 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1D000000-0000-0000-0000-000000000000[20179]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 15:33:45 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[20170]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 15:51:41 diglloyd-iMac syslogd[51]: ASL Sender Statistics
Oct 20 15:51:46 diglloyd-iMac xpcproxy[20297]: libcoreservices: _dirhelper_userdir: 529: bootstrap_look_up returned (ipc/send) invalid destination port
Oct 20 15:52:00 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.1D000000-0000-0000-0000-000000000000[20273]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 15:52:12 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Oct 20 15:52:45 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[20300]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 15:54:43 diglloyd-iMac com.apple.xpc.launchd[1] (com.apple.mdworker.shared.20000000-0000-0000-0000-000000000000[20443]): Service exited due to SIGKILL | sent by mds[77]
Oct 20 16:32:41 diglloyd-iMac syslogd[51]: ASL Sender Statistics

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