Short answer

ESP32 hits the task watchdog in a simple loop. What usually causes it?

  • A tight loop that never yields starves the IDLE task. Add vTaskDelay or yield; do not spin on GPIO polls in app_main forever.
  • Blocking in a high-priority task while Wi-Fi or lwIP needs CPU looks like a random TWDT panic.
  • Long critical sections and printf floods in ISR context also trip the watchdog.
  • If you disabled the watchdog to ‘make it run’, you only hid a scheduling bug. Fix the wait path.

中文

短答

简单循环里 ESP32 触发任务看门狗，常见原因？

  • 死循环不让出 CPU，IDLE 饿死。加 vTaskDelay 或 yield，不要在 app_main 里空转扫 GPIO。
  • 高优先级任务堵死，Wi-Fi / lwIP 抢不到时间，也会像随机 TWDT。
  • 过长临界区、在中断里狂打日志，同样会踢看门狗。
  • 关掉看门狗只是藏调度问题。把等待路径改对。