GUIDINGLI opened a new pull request #4021:
URL: https://github.com/apache/incubator-nuttx/pull/4021


   
   sched/waitpid: handle waitpid waitting tcb->group is NULL
   ## Summary
   
   Fail case:
   exit -> nxtask_terminate -> nxtask_exithook -> nxsched_release_tcb
                               group_leave     || nxsched_releasepid & 
group_leave
                                               /\
                                              /  \
                                          switch out & waitpid()
   
   Thread A group_leave in nxtask_exithook, switch out,
   Thread B do waitpid(thread A) then meet traget thread A group is NULL, error.
   
   Change-Id: Ia181d7a13aa645ec1c3141a45839fbf79db35b17
   Signed-off-by: ligd <liguidi...@xiaomi.com>
   
   
   
   ## Impact
   
   ## Testing
   
   


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