This bug was fixed in the package lxc - 0.9.0-0ubuntu3.2
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lxc (0.9.0-0ubuntu3.2) raring-proposed; urgency=low
* 0004-cgroup-prevent-DOS-when-a-hierachy-is-mounted-multip.patch: prevent
DOS when a cgroup hierarchy is mounted multiple times (LP: #1176287)
-- Serge Hallyn
Hello Reinhard, or anyone else affected,
Accepted lxc into raring-proposed. The package will build now and be
available at http://launchpad.net/ubuntu/+source/lxc/0.9.0-0ubuntu3.2 in
a few hours, and then in the -proposed repository.
Please help us by testing this new package. See
This new version of lxc does indeed fix the symptoms for me on raring.
Thanks for the prompt update.
** Tags removed: verification-needed
** Tags added: verification-done
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Thanks for the information. The key was in the /proc/self/mounts
output: you have cgroups mounted in schroots. This is triggering a bug
in the way cgroups are handled in lxc.
You should be able to work around it by unmounting the cgroup
filesystems from under /var/lib/schroot/mount/rtmpdump-
** Description changed:
- I've played around with steam-lxc, but the container fails to start.
- Some debugging reveals:
+ === SRU Justification ===
+ 1. Impact: users who have cgroups mounted in more than one place will hang
thier
+ system when starting an lxc container
+ 2.
This bug was fixed in the package lxc - 0.9.0-0ubuntu7
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lxc (0.9.0-0ubuntu7) saucy; urgency=low
* 0005-cgroup-prevent-DOS-when-a-hierachy-is-mounted-multip.patch: prevent
DOS when a cgroup hierarchy is mounted multiple times (LP: #1176287)
-- Serge Hallyn
From: /var/log/lxc/siretart-steam.log
lxc-start 1367650042.758 INFO lxc_start_ui - using rcfile
/var/lib/lxc/siretart-steam/config
lxc-start 1367650042.758 INFO lxc_apparmor - aa_enabled set to 1
lxc-start 1367650042.758 DEBUGlxc_start - sigchild handler set
How can I debug the problem further?
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https://bugs.launchpad.net/bugs/1176287
Title:
lxc-start: Error creating cgroups
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The error message is thrown here in the code:
http://bazaar.launchpad.net/~ubuntu-
branches/ubuntu/raring/lxc/raring/view/head:/src/lxc/cgroup.c#L578
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the lxc-start command seems to massively create cgroups:
find /sys/fs/cgroup/ -name 'siretart-steam*' -print | wc -l
589773
What does create that many cgroups?
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Coudl you please show the result of
find /sys/fs/cgroup -maxdepth 3
Also, please post the full debug.out file after doing
sudo lxc-start -l info -o debug.out --name siretart-steam
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Sorry, please also show the output of:
dpkg -l | grep cgroup
cat /proc/self/mounts
** Changed in: lxc (Ubuntu)
Status: New = Incomplete
** Changed in: lxc (Ubuntu)
Importance: Undecided = High
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** Attachment added: find_sys_fs_cgroup.txt.gz
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1176287/+attachment/3664775/+files/find_sys_fs_cgroup.txt.gz
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** Attachment added: dpkg_l_cgroup
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1176287/+attachment/3664777/+files/dpkg_l_cgroup
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** Attachment added: lxc-debug.out
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1176287/+attachment/3664776/+files/lxc-debug.out
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** Attachment added: proc_self_mounts
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1176287/+attachment/3664778/+files/proc_self_mounts
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I've added all requested information now. Please indicate if there is
anything else that may be helpful for diagnosing the problem.
** Changed in: lxc (Ubuntu)
Status: Incomplete = Confirmed
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