[Bug 1703975] [NEW] lsof faulty output while using -F option

[Manik Jain]

Public bug reported:

After upgrading to xenial, the -F option returns faulty output
especially when used with field character 'n'.

OS version --> xenial, lsof --> 4.89 :


# lsb_release -rd
Description:	Ubuntu 16.04.2 LTS
Release:	16.04

# uname -a
Linux some-hostname.com 4.4.0-1020-aws #29-Ubuntu SMP Wed Jun 14 15:54:52 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

# dpkg -l lsof
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                                          Version                     Architecture                Description
+++-=============================================-===========================-===========================-===============================================================================================
ii  lsof                                          4.89+dfsg-0.1               amd64                       Utility to list open files


Running lsof with '-Fn' lists some entries starting with 'f' for e.g. f5, f8, f11 below: (hostnames/port no. changed below)


# lsof -a -iTCP -sTCP:ESTABLISHED  -P -Fn
p11628
f5
nsome-hostname.com:59612->ec2-x-x-x-x.xxxx.amazonaws.com:443
f8
nlocalhost:29896->localhost:80
f11
nlocalhost:12150->localhost:80
p25352


-------


While on precise it still seems to work fine:

OS version --> precise, lsof --> 4.81

# lsb_release -rd
Description:	Ubuntu 12.04.5 LTS
Release:	12.04

# uname -a
Linux some-hostname.com 3.13.0-117-generic #164~precise1-Ubuntu SMP Mon Apr 10 16:16:25 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

# dpkg -l lsof
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                                          Version                                       Description
+++-=============================================-=============================================-==========================================================================================================
ii  lsof                                          4.81.dfsg.1-1build1                           List open files


Running lsof with '-Fn' option in precise doesn't show anything like
'f10,f8,f5,f11' that's seen for xenial as put above. (hostnames/port no.
changed below)


# lsof -a -iTCP -sTCP:ESTABLISHED  -P -Fn

p23957
nsome-hostname.com:22375->some-domain-address:7483
p22118
nlocalhost:12346->localhost:80
nlocalhost:32121->localhost:80
nsome-hostname.com:13380->ec2-x-x-x-x.xxxx.amazonaws.com:443
p15128

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

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https://bugs.launchpad.net/bugs/1703975

Title:
  lsof faulty output while using -F option

Status in lsof package in Ubuntu:
  New

Bug description:
  After upgrading to xenial, the -F option returns faulty output
  especially when used with field character 'n'.

  OS version --> xenial, lsof --> 4.89 :

  
  # lsb_release -rd
  Description:	Ubuntu 16.04.2 LTS
  Release:	16.04

  # uname -a
  Linux some-hostname.com 4.4.0-1020-aws #29-Ubuntu SMP Wed Jun 14 15:54:52 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

  # dpkg -l lsof
  Desired=Unknown/Install/Remove/Purge/Hold
  | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name                                          Version                     Architecture                Description
  +++-=============================================-===========================-===========================-===============================================================================================
  ii  lsof                                          4.89+dfsg-0.1               amd64                       Utility to list open files

  
  Running lsof with '-Fn' lists some entries starting with 'f' for e.g. f5, f8, f11 below: (hostnames/port no. changed below)

  
  # lsof -a -iTCP -sTCP:ESTABLISHED  -P -Fn
  p11628
  f5
  nsome-hostname.com:59612->ec2-x-x-x-x.xxxx.amazonaws.com:443
  f8
  nlocalhost:29896->localhost:80
  f11
  nlocalhost:12150->localhost:80
  p25352

  
  -------

  
  While on precise it still seems to work fine:

  OS version --> precise, lsof --> 4.81

  # lsb_release -rd
  Description:	Ubuntu 12.04.5 LTS
  Release:	12.04

  # uname -a
  Linux some-hostname.com 3.13.0-117-generic #164~precise1-Ubuntu SMP Mon Apr 10 16:16:25 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

  # dpkg -l lsof
  Desired=Unknown/Install/Remove/Purge/Hold
  | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name                                          Version                                       Description
  +++-=============================================-=============================================-==========================================================================================================
  ii  lsof                                          4.81.dfsg.1-1build1                           List open files


  Running lsof with '-Fn' option in precise doesn't show anything like
  'f10,f8,f5,f11' that's seen for xenial as put above. (hostnames/port
  no. changed below)

  
  # lsof -a -iTCP -sTCP:ESTABLISHED  -P -Fn

  p23957
  nsome-hostname.com:22375->some-domain-address:7483
  p22118
  nlocalhost:12346->localhost:80
  nlocalhost:32121->localhost:80
  nsome-hostname.com:13380->ec2-x-x-x-x.xxxx.amazonaws.com:443
  p15128

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