RTX and watchdog monitoring

I wondering what method you're using to monitor the sanity state of the RTOS and activate a watchdog in case of failure.

Currently, I have a hardware watchdog feed in the lower priority task . But in some case it's not working :
The RTX can be OK but one task can be stuck , or buffers cannot be allocated or others reasons.

According to you , what is the best method ?

thanks in advance.

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