Public bug reported:

ubuntu@recht:~$ iperf -c 192.168.121.2 -P10 -w 130k -t 3600
------------------------------------------------------------
Client connecting to 192.168.121.2, TCP port 5001
TCP window size:  254 KByte (WARNING: requested  127 KByte)
------------------------------------------------------------
[ 10] local 192.168.121.3 port 40756 connected with 192.168.121.2 port 5001
[ 12] local 192.168.121.3 port 40760 connected with 192.168.121.2 port 5001
[ 11] local 192.168.121.3 port 40758 connected with 192.168.121.2 port 5001
[  8] local 192.168.121.3 port 40754 connected with 192.168.121.2 port 5001
[  9] local 192.168.121.3 port 40752 connected with 192.168.121.2 port 5001
[  7] local 192.168.121.3 port 40750 connected with 192.168.121.2 port 5001
[  6] local 192.168.121.3 port 40746 connected with 192.168.121.2 port 5001
[  5] local 192.168.121.3 port 40748 connected with 192.168.121.2 port 5001
[  3] local 192.168.121.3 port 40744 connected with 192.168.121.2 port 5001
[  4] local 192.168.121.3 port 40742 connected with 192.168.121.2 port 5001
Segmentation fault (core dumped)

Will report more information with gdb attached.

** Affects: iperf (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1771283

Title:
  iperf2 long time run on 40Gb/s NIC crashes

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