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lv_task_handler can fail to return in high load scenarios, causing watchdog resets

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难度
4/5
预计耗时
3-5 天
新手友好度
35/100
Issue 类型
缺陷
描述清晰度
需要澄清
活跃度
停滞

调研方向

先跟踪 issue 中描述的 lv_task_handler 与 DisplayApp/SystemTask 交互,然后在高动画负载下使用更短的 LV_DISPLAY_REFR_PERIOD 重现锁死。完成的标准是:任务处理器在持续负载下能够返回,并且消息队列不再导致看门狗重置。

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描述

bug

The LVGL task handler re-evaluates higher priority tasks after executing lower priority ones
The animation task is higher priority than refresh tasks
If the animation task or refresh task takes a long time, after executing the refresh task the animation task may be ready again
This causes lv_task_handler to infinitely execute animation->refresh->animation->refresh etc without ever returning
If lv_task_handler doesn't return, the DisplayApp message queue becomes full (usually with touchscreen events) and blocks SystemTask, causing watchdog resets

This happens very rarely or even never in standard InfiniTime. But by either decreasing the LV_DISPLAY_REFR_PERIOD and increasing animation load (e.g animation scroll speed for labels in px/s) (I have not tested if both are required to trigger this behaviour, but I know that both are sufficient), it's possible to reproduce this lockup.

I'd suggest that we replace the LVGL task handler with one that provides a hard upper bound on the number of task executions. Perhaps by only executing each task once and exiting early if it's already spent too long doing work (many tasks waiting)? This would allow task priorities to still be usefully enforced. Lower priority refresh tasks might still get starved by animations though.

Possible cause for #2012 (the notification header scrolling animation)

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