What do you mean by mac restarted: previous shutdown cause: -20

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I'm using macs as servers.

I found that the mac has been restarted according to:

last reboot

Returns

reboot ~. Sun Aug 2 23:19

While looking into logs

log show --predicate 'eventMessage contains "Previous shutdown cause"' --last 13h

I see

Timestamp           Thread Type    Activity PID TTL
2020-08-02 23:19:53 0xc3   Default 0x0      0   0   kernel: (AppleSMC) Previous shutdown cause: -20

What does shutdown cause -20 mean?

macos logging
1 Answers

You can look at the list of all shutdown causes here

-20:

  BridgeOS T2-initiated shutdown. -  The T2 chip in your 2018+ MacBook Pro or other Mac  initiated a shutdown.
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