Public bug reported:
Ubuntu version:
Description: Ubuntu 12.04.2 LTS
Release: 12.04
lxc version:
lxc:
Installed: 0.7.5-3ubuntu66
Candidate: 0.7.5-3ubuntu66
Version table:
*** 0.7.5-3ubuntu66 0
500 http://us-east-1.ec2.archive.ubuntu.com/ubuntu/
precise-updates/universe amd64 Packages
100 /var/lib/dpkg/status
0.7.5-3ubuntu52 0
500 http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise/universe
amd64 Packages
Expected:
Expected it to work as normal, not hang.
What happened instead:
This is pretty easy to reproduce by running a bunch of processes (5 is
fine to reproduce) that continuously execute very short lxc-execute
processes (less than a second).
Here is a log from the process calling lxc-execute:
Feb 27 12:54:30 Running now: lxc-execute -n vm16946 -f /mnt/vm16946/lxc.conf --
sh /task/.runtask
Feb 27 12:54:30 Command executed, starting to read streams
Feb 27 12:54:30 out: hello
That's it, never exits/finishes. The program running inside lxc is a
ruby program that prints "hello", that's all it does.
ps -ef shows this:
root 16090 16946 0 20:54 ? 00:00:00 lxc-execute -n vm16946 -f
/mnt/vm16946/lxc.conf -- sh /task/.runtask
root 16100 16090 0 20:54 ? 00:00:00 [lxc-init] <defunct>
This never goes away and the parent process of lxc-execute hangs forever
too.
On a side note, this same thing running on Quantal with lxc 0.8 rc1 will
make the entire machine completely unresponsive so it actually gets
worse in 0.8.
** Affects: lxc (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1134923
Title:
Running a lot of lxc-execute processes concurrently causes defunct
processes, hangs forever
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