Thanks for clarification. I currently have two containers and so a race
condition is very probable.
Can I help with testing something or is it already ready to be fixed?
Christoph
----- Original Message -----
From: "Serge Hallyn" <serge.hal...@canonical.com>
To: "Christoph Mitasch" <cmita...@thomas-krenn.com>
Cc: lxc-users@lists.sourceforge.net
Sent: Friday, August 24, 2012 2:50:50 PM
Subject: Re: [Lxc-users] lxc_cgroup start error
Quoting Christoph Mitasch (cmita...@thomas-krenn.com):
> Hello,
>
> I've built a LXC HA Cluster with Pacemaker and DRBD with Ubuntu 12.04.
>
> >From time to time I get the following error when a container is startet.
> lxc-start 1345755927.759 ERROR lxc_cgroup - File exists - failed to
> create '/sys/fs/cgroup/perf_event//lxc' directory
> lxc-start 1345755927.759 ERROR lxc_start - failed to spawn 'test2'
> lxc-start 1345755928.023 ERROR lxc_cgroup - No such file or
> directory - failed to remove cgroup '/sys/fs/cgroup/perf_event//lxc/test2'
>
> Any ideas what the problem could be here?
Sounds like a race in src/lxc/cgroup.c. I'm guessing that:
/* if cgparent does not exist, create it */
if (access(cgparent, F_OK) && mkdir(cgparent, 0755)) {
SYSERROR("failed to create '%s' directory", cgparent);
return -1;
}
the first two containers created after boot are racing here, and this
should be changed to
/* if cgparent does not exist, create it */
if (access(cgparent, F_OK) && mkdir(cgparent, 0755)) {
if (errno != EEXIST) {
SYSERROR("failed to create '%s' directory", cgparent);
return -1;
}
}
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