Public bug reported:
Apt-cacher keeps a list of the pids of any children it forks/spawns. At
shutdown, it terminates them all with SIGTERM. Unfortunately, it
doesn't catch SIGCHLD and remove a normal finished child from the list.
So after it's been running for a while, that list of PIDs will be fairly
long and rather comprehensive (on one recent server where I noticed it,
the list had 25000 unique PIDs, i.e. about 3/4s of the available PID
space :)).
The only mitigating factor is that apt-cacher runs as www-data by
default, although that doesn't help if you're running it on the same
server as apache2, nginx or some other www-data running process.
Patch attached fixes this; it uses a hash instead of an array, and traps
SIGCHLD to catch when children finish. Seems to work ok in a short time
running it here.
** Affects: apt-cacher (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug lucid
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https://bugs.launchpad.net/bugs/882874
Title:
apt-cacher has poor childpid management
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