ethernet SPI conflict?

[lautaroleon]

Hi. I spend some time trying to figure it out a problem with my SPI communication. Finally, I found the source of the problem but I can't fully understand it.
Happen that the SS pin goes high ahead of time, before the transaction ends. It seems like the SPI transaction runs in a different thread and the code keep going before all the clk cycles ends.
I tried a lot of think, but finally I found that getting rid of some UDP messages that I was sending just before the transaction the problem disappear.
Someone has a hint about what it can be happening?
Thanks.

 

[PaulStoffregen]

I'm confused by this question.

Someone has a hint about what it can be happening?

I connected my scope and ran the Ethernet WebClient example on a Teensy 4.1 with Wiz850io ethernet. The best hint I can give is it does not appear to be "SS pin goes high ahead of time".