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CRIU uses the same API as debuggers do to get some tasks' state and this API (the ptrace one) doesn't allow for multiple debuggers to explore a task. Thus tasks under gdb or strace cannot be dumped.
CRIU uses the same API as debuggers do to get some tasks' state and this API (the ptrace one) doesn't allow for multiple debuggers to explore a task. Thus tasks under gdb or strace cannot be dumped.
== Task from different user (for non root) ==
For security reasons, if CRIU is requested by non-root to dump some other task, it doesn't do it unless the dumpee belongs to the same user.