Verified according to test case from description:
ubuntu@xenial:~$ dpkg -l | grep procps
ii procps 2:3.3.10-4ubuntu2.5
amd64 /proc file system utilities
ubuntu@xenial:~$ ps -o thcount
THCNT
1
1
** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial
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https://bugs.launchpad.net/bugs/1410558
Title:
ps doesn't support "thcount" format specifier on Xenial
Status in procps package in Ubuntu:
Fix Released
Status in procps source package in Xenial:
Fix Committed
Bug description:
[Impact]
ps -o thcount prints out an error (error: unknown user-defined format
specifier "thcount")
[Description]
The Xenial version of procps has a bug in the thcount format specifier. ps
doesn't recognize it, and complains about an unknown user-defined format.
This is due to the format specifier table in ps/output.c, which is queried
with a binary search. Since the "thcount" entry appears out of order in Xenial,
it can't be looked up and the program fails with the "unknown user-defined
format specifier" error.
This has been fixed upstream by the commit below:
- Fix for Bug:1174313 (3a52dfa34027)
$ git describe --contains 3a52dfa34027
v3.3.12~58^2
$ rmadison procps
procps | 2:3.3.10-4ubuntu2 | xenial | source, ...
procps | 2:3.3.10-4ubuntu2.4 | xenial-security | source, ...
procps | 2:3.3.10-4ubuntu2.4 | xenial-updates | source, ... <--------
procps | 2:3.3.12-3ubuntu1 | bionic | source, ...
procps | 2:3.3.12-3ubuntu1.1 | bionic-security | source, ...
procps | 2:3.3.12-3ubuntu1.2 | bionic-updates | source, ...
Releases starting with Bionic already have this fix, so it's only
needed for Xenial.
[Test case]
1. Boot up a Xenial environment with e.g. an lxd container:
# lxc launch images:ubuntu/xenial xenial
2. Execute ps with the '-o thcount' options:
# lxc exec xenial -- ps -o thcount
error: unknown user-defined format specifier "thcount"
Usage:
ps [options]
Try 'ps --help <simple|list|output|threads|misc|all>'
or 'ps --help <s|l|o|t|m|a>'
for additional help text.
For more details see ps(1).
[Regression Potential]
The fix just fixes the order of two entries in the format specifier array, so
the regression potential is very low. Furthermore, the patch has been present
and tested in up-to-date versions of procps since Bionic. Any new regressions
introduced in Xenial will be checked with autopkgtest.
[Original Description]
In Ubuntu 12.04.5 LTS (procps 1:3.2.8-11ubuntu6.3), the following worked fine:
$ export PS_FORMAT=thcount
$ ps
THCNT
1
1
In Ubuntu 14.04.1 LTS (procps 1:3.3.9-1ubuntu2), it does not work
anymore:
$ export PS_FORMAT=thcount
$ ps
warning: $PS_FORMAT ignored. (unknown user-defined format specifier "thcount")
PID TTY TIME CMD
6593 pts/1 00:00:00 ps
16633 pts/1 00:00:00 bash
Other PS_FORMAT specifiers still work fine (I have tried many, but not
all).
In real-life usage, a more complex PS_FORMAT would of course be used,
such as
PS_FORMAT=pid,s,thcount,nice,euser,egroup,etime,cputime,%mem,rssize:6,size:7,vsize:7,command
Workaround: use nlwp instead of thcount (they are alias to the same
data, and nlwp works fine in both versions).
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/procps/+bug/1410558/+subscriptions
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