failed to create container

[ms140569]

I'm running this youki compiled from source:

youki version 0.0.5
commit: 0.0.5-0-984e41bb

on:

Ubuntu 18.04.6 LTS
Linux 4.15.0-167-generic x86_64 x86_64

i've tried to setup the busybox container as described here:

https://github.com/containers/youki#create-and-run-a-container

and setup a standard - not rootless - container, but get this error:

...
[DEBUG crates/libcgroups/src/v1/manager.rs:43] 2023-04-19T12:28:09.322205964+02:00 Get path for subsystem: freezer
[ERROR crates/youki/src/main.rs:145] 2023-04-19T12:28:09.328524127+02:00 error in executing command: failed to create container

Caused by:
0: failed to fork process
1: failed to run clone3
2: 38
Error: failed to create container

Caused by:
0: failed to fork process
1: failed to run clone3
2: 38

I've found these entries in the strace output:

statx(AT_FDCWD, "/sys/fs/cgroup/net_cls,net_prio/my_testcontainer", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7ffd5a69a1d0) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/sys/fs/cgroup/cpuset/my_testcontainer", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7ffd5a69a1d0) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/sys/fs/cgroup/pids/my_testcontainer", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7ffd5a69a1d0) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/sys/fs/cgroup/perf_event/my_testcontainer", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7ffd5a69a1d0) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/sys/fs/cgroup/hugetlb/my_testcontainer", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7ffd5a69a1d0) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/sys/fs/cgroup/memory/my_testcontainer", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7ffd5a69a1d0) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/sys/fs/cgroup/cpu,cpuacct/my_testcontainer", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7ffd5a69a1d0) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/sys/fs/cgroup/blkio/my_testcontainer", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7ffd5a69a1d0) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/sys/fs/cgroup/freezer/my_testcontainer", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7ffd5a69a1d0) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/sys/fs/cgroup/net_cls,net_prio/my_testcontainer", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7ffd5a69a1d0) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/sys/fs/cgroup/cpu,cpuacct/my_testcontainer", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7ffd5a69a1d0) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/sys/fs/cgroup/devices/my_testcontainer", AT_STATX_SYNC_AS_STAT, STATX_ALL, 0x7ffd5a69a1d0) = -1 ENOENT (No such file or directory)

Could this be related?
What could be the reason for the failure?
Is there anything i could do to troubleshoot this without the need for full-fledged debugging into it?

cheers, Matthias

[utam0k]

Hi, @ms140569! Thanks for your report.

Unfortunately, you need to update the kernel version because we need to clone3(2)

Caused by:
0: failed to fork process
1: failed to run clone3
2: 38
Error: failed to create container

[ms140569]

Thanks for the very fast clarification! We might place those system-requirements somewhere prominent in the README.md ...

[utam0k]

@ms140569 I have sent out the PR #1857