Hi Serge,
Attached are upstart session job output and cgmanager output showing
"good" (desktop utopic in kvm) and "bad" (device) runs:
Note the following:
- The session init in both cases is making the call on cgmanager as a
non-priv user in an identical way:
cgmanager_create_sync(controller='freezer', path='upstart_cgroup')
- However, once that gets across the wire, we have differences:
The good run shows:
do_create_main:263: controller='freezer', cgroup='upstart_cgroup', ucred
p=(pid=2948, uid=1000, gid=1000), ucred r=(pid=2948, uid=1000, gid=1000)
do_create_main:318: r.pid=2948, r.uid=1000, r.gid=1000,
dirpath='/run/cgmanager/fs/freezer/user.slice/user-1000.slice/session-c2.scope'
The bad run shows:
do_create_main:263: controller='freezer', cgroup='upstart_cgroup', ucred
p=(pid=638, uid=0, gid=0), ucred r=(pid=3554, uid=32011, gid=32011)
do_create_main:318: r.pid=3554, r.uid=32011, r.gid=32011,
dirpath='/run/cgmanager/fs/freezer'
= Differences =
== Path ==
As you picked up previously, upstart never requested that cgmanager
create '/run/cgmanager/fs/freezer', but for some reason that's the
request that arrives. The correct path should be
'/run/cgmanager/fs/freezer/user.slice/user-1000.slice/session-c2.scope'
== uid ==
Bad run shows "uid=0" and "gid=0" - this looks incorrect.
= Possible culprits =
== cgproxy ==
This is running on the device along with cgmanager since the kernel
version is 3.4.67.
However, even when running in debug mode, the entire contents of
/var/log/upstart/cgproxy.log is:
--------------------
Connection from private client
Create: Client fd is: 8 (pid=3554, uid=32011, gid=32011)
cgmanager_create: returning -1; existed is -1
Disconnected from private client
--------------------
== Other possibilities ==
- kernel
- logind?
** Attachment added: "bug-1357252-upstart+cgmanager-logs-20140820.tgz"
https://bugs.launchpad.net/ubuntu-app-launch/+bug/1357252/+attachment/4182419/+files/bug-1357252-upstart%2Bcgmanager-logs-20140820.tgz
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https://bugs.launchpad.net/bugs/1357252
Title:
Upstart jobs specifying cgroup fail to start occasionally
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