> How specifically does this fix the problem.  I suspect you're just 
> papering over the bug by changing the order of thread processing.
> 
> You'll note that when a thread is canceled we call the 
> paths.unordered_remove without incrementing i.  AFAICT you're just 
> changing order in which paths out of the array.
> 
> 
> Jeff

Please check my explanation in
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78879#c11

Thanks!

Yuan, Pengfei

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