[lxc-users] lxc-start fails with invalid pid on arm

[Praveen Kumar Verma]

Hi Serge,

Sorry I am not cleared; Please see my answers pointwise:

>>i don't understand what you've done, what you wanted to have happen, or what actually happened.

I took a busybox based filesystem which doesn't have any lxc-container support.
So I downloaded the lxc-1.1.0 package & After cross compiling the lxc package I installed the binaries in busybox file system.
Our aim is to support linux container on busybox based filesystem. So that we can boot android or busybox over linux container.

>> When you say "I am login as a root in buysbox file system", what do you mean exactly
I use "root" as a login to busybox file system. Till now I have not created any container. I logged in as a root into busybox file system.

>>what do you mean exactly, is that logged in over lxc-console with the container running?
No, I havenot created any container till now. After login into busybox filesystem, Now I create a container named "bb" using lxc-create. Now after creating the container, I can see the rootfs present in /var/lib/lxc/bb directory, that means container successfully created.

>> Why did you create the 'root' cgroups by hand?
We didn't have cgmanger to handle the cgroup so I created a root entry in cgroup.

>>  or what actually happened?
After doing all above, when I started a container using "lxc-start" it fails with invalid pid. As follows:

       lxc-start 1414573214.442 DEBUG    lxc_conf - conf.c:setup_caps:2139 - capabilities have been setup
       lxc-start 1414573214.442 NOTICE   lxc_conf - conf.c:lxc_setup:3921 - 'bb' is setup.
       lxc-start 1414573214.442 NOTICE   lxc_start - start.c:start:1232 - exec'ing '/sbin/init'
       lxc-start 1414573214.482 NOTICE   lxc_start - start.c:post_start:1243 - '/sbin/init' started with pid '1896'
       lxc-start 1414573214.482 WARN     lxc_start - start.c:signal_handler:307 - invalid pid for SIGCHLD


Please let me know if I unclear on any point.

Regards,
Praveen


________________________________________
From: lxc-users [lxc-users-bounces at lists.linuxcontainers.org] on behalf of Serge Hallyn [serge.hallyn at ubuntu.com]
Sent: Saturday, April 04, 2015 7:44 AM
To: LXC users mailing-list
Subject: Re: [lxc-users] lxc-start fails with invalid pid on arm

Quoting Praveen Kumar Verma (Praveen.Verma at LntTechservices.com):
> Greetings,
>
> I am trying containers on busybox based file-system with kernel 3.12.
>
> I have successfully cross-compiled the lxc-1.1.0 package, & able to run lxc-execute without any problem.
>
> Now I want to run linux with busybox template in container.
>
> I created a container named "bb" under /var/lib/lxc/bb. I can see config, fstab & rootfs file present there.
>
> But when I tried to start the container, I am getting the following error: (The full log is attached in a file)
>
>       lxc-start 1414573214.442 DEBUG    lxc_conf - conf.c:setup_caps:2139 - capabilities have been setup
>       lxc-start 1414573214.442 NOTICE   lxc_conf - conf.c:lxc_setup:3921 - 'bb' is setup.
>       lxc-start 1414573214.442 NOTICE   lxc_start - start.c:start:1232 - exec'ing '/sbin/init'
>       lxc-start 1414573214.482 NOTICE   lxc_start - start.c:post_start:1243 - '/sbin/init' started with pid '1896'
>       lxc-start 1414573214.482 WARN     lxc_start - start.c:signal_handler:307 - invalid pid for SIGCHLD
>
>
> I am login as a root in buysbox file system. and i have manually added the root into cgroups using following:
>
>        for d in /sys/fs/cgroup/*; do
>             mkdir $d/root
>             chown -R root: $d/root
>             echo $$ > $d/root/tasks
>        done
>
>       root at evm:/sys/fs/cgroup/cpuset# cat /proc/self/cgroup
>
>         7:freezer:/root
>         6:devices:/root
>         5:memory:/root
>         4:cpuacct:/root
>         3:cpu:/root
>         2:cpuset:/root
>
> Please help me in the issue.

I'm sorry, i don't understand what you've done, what you wanted to have
happen, or what actually happened.

Exactly how did you create the container?  When you say "I am login as a root
in buysbox file system", what do you mean exactly, is that logged in over
lxc-console with the container running?  Why did you create the 'root' cgroups
by hand?
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