- Reason:
A task and B interrupt indirectly access the shared resource pxDelayedTaskList without proper security protection, leading to further crash.
A task uses xEventGroupSetBits() to access the pxDelayedTaskList resource:
xEventGroupSetBits() -> vTaskRemoveFromUnorderedEventList() -> uxListRemove() -> pxList, where pxList is the pxDelayedTaskList.
At this point, another B interrupt is triggered (xEventGroupSetBits only suspends task scheduling and does not disable interrupts) and also accesses the pxDelayedTaskList resource:
MacIsrSigPostDefHdl() -> __wifi_queue_send_from_isr() -> xQueueGenericSendFromISR() -> xTaskRemoveFromEventList() -> prvResetNextTaskUnblockTime() -> pxDelayedTaskList.
This leads to an unsafe access to the pxDelayedTaskList resource by two entities, causing subsequent crash exceptions.
- Fix:
Modify the timing of the call to prvResetNextTaskUnblockTime() within xTaskRemoveFromEventList from unconditional execution to only execute when task scheduling is enabled.
This way, when the B interrupt reaches xTaskRemoveFromEventList, it will not call prvResetNextTaskUnblockTime to access the pxDelayedTaskList resource (due to task scheduling being disabled).
After the B interrupt execution is complete and control returns to A task, xTaskResumeAll() will be called, and then prvResetNextTaskUnblockTime() will update the pxDelayedTaskList resource again.
Issue : Restarting the server without 30sec delay between httpd_stop() and httpd_start() causes EADDRINUSE error
Resolution : Use setsockopt() to enable SO_REUSEADDR on listener socket
Closes https://github.com/espressif/esp-idf/issues/3381
1. there is a risk of ticks_end overflow, if xTaskGetTickCount() plus ticks_to_wait is bigger than portMAX_DELAY
2. potential blocking code on waiting for tx fifo done. It usually occurs at esp uart uses flow control, and the other side of uart not.
fix(lib): check and reset mac reg every 2s when rx hang occurs
See merge request sdk/ESP8266_RTOS_SDK!1595
(cherry picked from commit 30a4ba7e2d)
fb5894a9 fix(lib): check and reset mac reg every 2s when rx hang occurs
