[Bug 204178] stress2 on arm64 thr1 hangs after printing pthread_join error

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204178

--- Comment #1 from Andrew Turner <Andrew at FreeBSD.org> ---
I'm not sure if the message is related to the hang. I've seen each independent
of each other.

It seems the process is stuck in the kernel waiting on a mutex:

# pprocstat -t 19405
  PID    TID COMM             TDNAME           CPU  PRI STATE   WCHAN    
19405 100607 thr1             -                 -1  120 sleep   umtxn     
19405 101334 thr1             -                 -1  152 sleep   umtxn     

# procstat -k 19405
  PID    TID COMM             TDNAME           KSTACK                       
19405 100607 thr1             -                mi_switch sleepq_catch_signals
sleepq_wait_sig _sleep umtxq_sleep do_lock_umutex __umtx_op_wait_umutex
do_el0_sync 
19405 101334 thr1             -                mi_switch sleepq_catch_signals
sleepq_wait_sig _sleep umtxq_sleep do_lock_umutex __umtx_op_wait_umutex
do_el0_sync

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