sin-ack 18f260b78b Kernel: Handle removal of Process from list before unref ...

This makes the following scenario impossible with an SMP setup:

1) CPU A enters unref() and decrements the link count to 0.
2) CPU B sees the process in the process list and ref()s it.
3) CPU A removes the process from the list and continues destructing.
4) CPU B is now holding a destructed Process object.

By holding the process list lock before doing anything with it, we
ensure that other CPUs can't find this process in the middle of it being
destructed.

2021-08-15 02:27:13 +02:00

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