DMA Timer capture will be interupt when I creat a new task

MCU: STM32F429
lvgl version: 6.1.2

I create a timer capture in the very beginning of the main(){…} program.
And the timer will update a variable periodically.
After the program reset, it looks good and the variable update perfect.

And I set a task_create command with a btn obj.
When I click on the btn, it will kill my time capture.(the timer will stop update the variable )

I am not sure what happened.

It’s hard to figure this out without a code sample. Are you polling the timer or using an interrupt? What are you doing inside the task?