Yes. The "tree" starting at dpkg was linear, with one child for each
process, except for who which was a leaf.

I just had a look at the code. /usr/lib/python2.5/site-
packages/landscape/lib/sysstats.py uses
twisted.internet.utils.getProcessOutputAndValue to call "who -q".
Therefore the actual cause of this bug might also lie in python-twisted-
core, which might for some reason have failed to reap this dead child.
Should this bug here therefore be marked as affecting twisted as well as
landscape-client?

I cannot reproduce the issue by calling landscape-sysinfo manually. If I
hadn't been in such a hurry, I might have thought of stracing landscape-
sysinfo, but it's too late for that now.

-- 
landscape-common.postinst stuck with defunct who
https://bugs.launchpad.net/bugs/277038
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