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== Problem ==
== Problem ==
When restoring a process tree without namespaces (i.e. into namespaces in which criu lives) one may frequently hit a "pid mismatch" problem. It happens when a process CRIU tries to restore has a PID which is already owned by some other process living in this pid namespace. There's no way one can restore a process tree in ''this'' namespace, so the only solution is to unshare the new pid namespace and restore the tree into it.
When restoring a process tree without [[namespaces]] (i.e. into namespaces in which criu lives) one may frequently hit a "pid mismatch" problem. It happens when a process CRIU tries to restore has a PID which is already owned by some other process living in this pid namespace. There's no way one can restore a process tree in ''this'' namespace, so the only solution is to unshare the new pid namespace and restore the tree into it.
When doing so we have two problems:
When doing so we have two problems: