[bug #64451] Unexpected behaviour of xargs when multiple children exit with 255 in parallel

Follow-up Comment #5, bug #64451 (project findutils):

From wait(2):
*WIFSTOPPED(*_wstatus_*)*
    returns true if the child process was stopped by delivery of a signal;
this is possible only if the call was done using *WUNTRACED* or when the child
is being traced (see *ptrace*(2)).

    OK so I guess this functionality is not supposed to be used as was testing
it.


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