[FS#800] ath9k sta and ap mode change. system hang

[LEDE Bugs]

The following task has a new comment added:

FS#800 - ath9k sta  and ap mode  change. system hang
User who did this - 李鹏 (lipeng)

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Does someboby konw why?  Beacuase the system  hang ,I get any hint about this problem. I just try . The I found it was the timer  , Even In the timer function  , do nothing , I got the same  result.
the system hang.  So I get the  result I just delete the timer . The system is ok . But I can.t understand  why . So can anyone explain the reason  , I  timer can cause the systme hang
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=800#comment2792