cannot support pstack get process stack

The debug pod and the target pod use **different users**.

When entering the corresponding directory through **cd /proc/1/root/xxx**, the data obtained through `pstack ` is all abnormal data, not the desired data. Then, the user group is modified through groupmod and usermod. The data output by pstack is not what is desired either.

No source files or tests are identified. Begin by reproducing the abnormal `pstack ` output from the debug pod after entering `/proc/1/root/xxx`, comparing the users and groups with the target pod. First confirm whether this repository can still receive changes, since it is marked unmaintained and points to another project; done would require a confirmed expected stack output and a reproducible fix.

Written by the indexing model from the issue text.