assertion "first != _Chain_Tail( &ready_queues[ index ] )"

[Jython]

HI, ALL!
  I coded the rtc driver for stm32 (which have no backup battery),    when
power off MCU then power on ,  got
assertion "first != _Chain_Tail( &ready_queues[ index ] )" failed: file
"../../cpukit/../../../stm32f4/lib/include/rtems/score/schedulerpriorityimpl.h",
line 166, function: _Scheduler_priority_Ready_queue_first

i dont know how to debug it.   the code is here
https://gist.github.com/goog/10950e57bfaf5489a3572ce87a971fe9
hope you could give me some help!
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