Bad file descriptor

Hi dear all,

2 days ago our master server overloaded, bpjobd process got many server resources, after restart NBU services I saw bpjobd log increased abnormally, 

-rw-rw-rw- 1 root root    34967134 Apr 20 23:59 log.042016
-rw-rw-rw- 1 root root    53303748 Apr 21 23:59 log.042116
-rw-rw-rw- 1 root root 35243017306 Apr 22 23:59 log.042216
-rw-rw-rw- 1 root root    31203173 Apr 23 23:59 log.042316
-rw-rw-rw- 1 root root    19902730 Apr 24 09:42 log.042416

We have about 370 million line "<16> <tid:47717857593888> bpjobd: socket() failed: Bad file descriptor (9)" 

What is troubleshooting steps in this case?

Thanks,