probetest is spinning with 100% CPU

I just now (2021-04-05 16:22:49) noticed that probetest (#40013 (closed)) on the broker is using 100% CPU:

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
 1486 root      20   0  765744 239348   9832 S  98.3   5.9  91550:09 probetest

Judging by the CPU time of 91500 minutes and 9 seconds, it has been like this for about (91550 * 60 + 9) / 3600. / 24 = 63 days.