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When using sudo iotop (latest version 0.6-2.el7) in a terminal in my newly installed CentOS 7.5, I get the following error message:

Traceback (most recent call last):

  File "/sbin/iotop", line 17, in <module>

    main()

  File "/usr/lib/python2.7/site-packages/iotop/ui.py", line 620, in main

    main_loop()

  File "/usr/lib/python2.7/site-packages/iotop/ui.py", line 610, in <lambda>

    main_loop = lambda: run_iotop(options)

  File "/usr/lib/python2.7/site-packages/iotop/ui.py", line 508, in run_iotop

    return curses.wrapper(run_iotop_window, options)

  File "/usr/lib64/python2.7/curses/wrapper.py", line 43, in wrapper

    return func(stdscr, *args, **kwds)

  File "/usr/lib/python2.7/site-packages/iotop/ui.py", line 501, in run_iotop_window

    ui.run()

  File "/usr/lib/python2.7/site-packages/iotop/ui.py", line 155, in run

    self.process_list.duration)

  File "/usr/lib/python2.7/site-packages/iotop/ui.py", line 434, in refresh_display

    lines = self.get_data()

  File "/usr/lib/python2.7/site-packages/iotop/ui.py", line 415, in get_data

    return list(map(format, processes))

  File "/usr/lib/python2.7/site-packages/iotop/ui.py", line 388, in format

    cmdline = p.get_cmdline()

  File "/usr/lib/python2.7/site-packages/iotop/data.py", line 292, in get_cmdline

    proc_status = parse_proc_pid_status(self.pid)

  File "/usr/lib/python2.7/site-packages/iotop/data.py", line 196, in parse_proc_pid_status

    key, value = line.split(':t', 1)

ValueError: need more than 1 value to unpack

Any idea how to fix this problem?

Apparently, recent kernel versions introduced a blank line in /proc/(pid)/status that iotop does not expect:

CapBnd: 0000001fffffffff

CapAmb: 0000000000000000

Seccomp:    0



SpeculationStoreBypass: vulnerable

As a zeroth approximation of a fix, edit (as root) /usr/lib/python2.7/site-packages/iotop/data.py ca l.195:

def parse_proc_pid_status(pid):

    result_dict = {}

    try:

        for line in open('/proc/%d/status' % pid):

            if not line.strip(): continue

            key, value = line.split(':t', 1)

            result_dict[key] = value.strip()

    except IOError:

        pass  # No such process



    return result_dict

where the if not line.strip(): continue is new. Beware that python does not have explicit braces, so the indentation of this line should match that of the line below it.

(Also see https://bugs.launchpad.net/pkg-website/+bug/1773383 for other fixes for this bug.)

Just to complement the accepted answer (couldn't add as comment because they don't allow multiple white spaces)

1. Search for the filepath of the Python script

sudo find ./usr/lib | grep iotop/data.py

2. Replace with sed

sed -i '1n;/key, value = line/i            if not line.strip(): continue' <script_path>

Be careful and check everything is ok the first time you run it.

For my systems, it is:

sudo sed -i '1n;/key, value = line/i            if not line.strip(): continue' /usr/lib/python2.7/dist-packages/iotop/data.py