Comment 0 for bug 1932523

Sometimes iotop fails with following error:

$ sudo iotop
Traceback (most recent call last):
  File "/usr/sbin/iotop", line 17, in <module>
    main()
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 737, in main
    main_loop()
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 727, in <lambda>
    main_loop = lambda: run_iotop(options)
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 620, in run_iotop
    return curses.wrapper(run_iotop_window, options)
  File "/usr/lib/python3.8/curses/__init__.py", line 105, in wrapper
    return func(stdscr, *args, **kwds)
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 612, in run_iotop_window
    ui.run()
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 188, in run
    self.refresh_display(iterations == 0, total, current,
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 476, in refresh_display
    lines = self.get_data()
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 457, in get_data
    return list(map(format, processes))
  File "/usr/lib/python3/dist-packages/iotop/ui.py", line 432, in format
    cmdline = p.get_cmdline()
  File "/usr/lib/python3/dist-packages/iotop/data.py", line 309, in get_cmdline
    proc_status = parse_proc_pid_status(self.pid)
  File "/usr/lib/python3/dist-packages/iotop/data.py", line 211, in parse_proc_pid_status
    for line in open('/proc/%d/status' % pid):
  File "/usr/lib/python3.8/codecs.py", line 322, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xd0 in position 20: invalid continuation byte

I found that /proc/pid/status can have an invalid UTF-8 symbol as part of Name, for example:

$ cat /proc/112413/status
Name: Инстанц�
Umask: 0002
State: S (sleeping)
Tgid: 112291
Ngid: 0
Pid: 112413
PPid: 112287
TracerPid: 0
Uid: 1000 1000 1000 1000
Gid: 1000 1000 1000 1000
FDSize: 4096
Groups: 4 24 27 30 46 116 126 1000
NStgid: 112291
NSpid: 112413
NSpgid: 112287
NSsid: 15882
VmPeak: 11092600 kB
VmSize: 11092564 kB
VmLck: 0 kB
VmPin: 0 kB
VmHWM: 5985748 kB
VmRSS: 5971968 kB
RssAnon: 5963752 kB
RssFile: 8212 kB
RssShmem: 4 kB
VmData: 6228788 kB
VmStk: 136 kB
VmExe: 8 kB
VmLib: 23640 kB
VmPTE: 12460 kB
VmSwap: 0 kB
HugetlbPages: 0 kB
CoreDumping: 0
THP_enabled: 1
Threads: 83
SigQ: 0/126975
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000000004
SigIgn: 0000000000001000
SigCgt: 2000000181004ccf
CapInh: 0000000000000000
CapPrm: 0000000000000000
CapEff: 0000000000000000
CapBnd: 0000003fffffffff
CapAmb: 0000000000000000
NoNewPrivs: 0
Seccomp: 0
Speculation_Store_Bypass: thread vulnerable
Cpus_allowed: ff
Cpus_allowed_list: 0-7
Mems_allowed: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000001
Mems_allowed_list: 0
voluntary_ctxt_switches: 571776
nonvoluntary_ctxt_switches: 10927

The attached patch fixes the problem.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: iotop 0.6-24-g733f3f8-1 [modified: usr/lib/python3/dist-packages/iotop/data.py]
ProcVersionSignature: Ubuntu 5.4.0-75.84-generic 5.4.119
Uname: Linux 5.4.0-75-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Fri Jun 18 15:19:11 2021
Dependencies:

InstallationDate: Installed on 2020-11-24 (205 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: iotop
UpgradeStatus: Upgraded to focal on 2020-11-25 (205 days ago)