The line in question is:

unsigned int max_in_before_reset = BARRIER_IN_THRESHOLD
                                   - BARRIER_IN_THRESHOLD % count;

count is set the line before it to:

  unsigned int count = bar->count;

(gdb) print bar->count
$2 = 0
(gdb) print count
$3 = 0
(gdb)

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https://bugs.launchpad.net/bugs/1559842

Title:
  SIGFPE in pthread_barrier_destroy in glibc 2.23

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