I’ve tried running the container with
$ sudo docker run -it --rm --security-opt seccomp=unconfined
ubuntu:resolute
I can confirm that tar fails because the openat2(2) system call fails:
# strace tar -c /usr/share -f /dev/null
[...]
openat2(AT_FDCWD, "/usr/",
{flags=O_RDONLY|O_NOFOLLOW|O_CLOEXEC|O_PATH|O_DIRECTORY, resolve=0}, 24) = -1
ENOSYS (Function not implemented)
However the host was running a very old kernel (4.19.0) that, for some
reason, was never updated. I’ve attempted an upgrade but the machine
isn’t coming back up after rebooting.
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https://bugs.launchpad.net/bugs/2161288
Title:
Regression: tar cannot create archives of /usr/share, errors out with
“Cannot stat: Function not implemented”
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