wangzhi16 commented on issue #17418:
URL: https://github.com/apache/nuttx/issues/17418#issuecomment-3645451458

   thread_parent ---------------------------------thread_child
   detach()
   group_leave()
   nxsig_cleanup()
   free()---->block!
   ---------------------------------------------------group_leave()
   ---------------------------------------------------check no member in group, 
release thread_parent.
   ---------------------------------------------------exit()
   release_tcb()--->double free!!!


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