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[Launchpad Bug Tracker <1771283@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package iperf - 2.0.10+dfsg1-1ubuntu0.18.04.1

---------------
iperf (2.0.10+dfsg1-1ubuntu0.18.04.1) bionic; urgency=medium

  * fix for: iperf2 long time run on 40Gb/s NIC crashes (LP: #1771283)

 -- Manoj Iyer <manoj.iyer@xxxxxxxxxxxxx>  Tue, 05 Jun 2018 11:48:25
-0500

** Changed in: iperf (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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

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

Status in iperf package in Ubuntu:
  Fix Released
Status in iperf source package in Xenial:
  Fix Released
Status in iperf source package in Artful:
  Fix Released
Status in iperf source package in Bionic:
  Fix Released
Status in iperf source package in Cosmic:
  Fix Released
Status in iperf package in Debian:
  New

Bug description:
  [Impact]
  Running iperf2 across 40GB connection for a long period of time causes iperf to segfault.

  [Test]
  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)

  [Fix]
  This is fixed latest iperf2
  git clone https://git.code.sf.net/p/iperf2/code

  commit fce3254827eb05fee56aa6a2e9f0d69cbe599a69
  Author: Robert McMahon <rjmcmahon@xxxxxxxxxxxxx>
  Date:   Sat Jun 2 11:48:22 2018 -0700

      fix for: iperf2 long time run on 40Gb/s NIC crashes, found ubuntu
  Bug #1771283, reported by Ike Panhc, increase format support to Peta
  as well

  [Regression Potential]
  This patch was tested on ARM64 Cavium ThunderX2 systems and no regressions were found.
  iperf calculates the sum of all bytes transferred and prints this sum like 'Sum: 100Mbytes'. For example if total data transferred was (simplified) 100,000,000 Bytes, iperf would print Sum: 100 Mbytes. The suffix Mbytes is stored in a static array and it uses the number of time it had to divide the sum by 1000 to determine the index to that array. iperf only accounted for Sums up to GBytes, causing it to segfault on Sums of +TBytes. Currently the patch extends this array to Peta Bytes, but you will segfault again if the sum is in the order of Exabyte or larger. This might be achievable by using 100G connections between server-client (Mellanox 100G nic & switch) and running iperf at max throughput for a long long long periods of time.

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