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this means that while restoring a process tree CRIU has failed to recreate a process or a thread with the PID (TID) value it used to have on dump. This most likely is due to the PID/TID value in question being busy with some other task or thread. There are several possible solutions to this.

this means that while restoring a process tree CRIU has failed to recreate a process or a thread with the PID (TID) value it used to have on dump. This most likely is due to the PID/TID value in question being busy with some other task or thread. There are several possible solutions to this.

One is to restore the images into a separate pid namespace. This can be done by using the <code>unshare -p --fork</code> command and then doing the restore. In this case you might also want to unshare the mount namespace and re-mount the /proc so that the restored tasks can use it. This method effectively means restoring tasks in container.

One is to restore the images into a separate pid namespace. This can be done by using the <code>unshare -p -m --fork --mount-proc</code> command and then doing the restore. In this case you might also want to unshare the mount namespace and re-mount the /proc so that the restored tasks can use it. This method effectively means restoring tasks in container.

Having said the above, the most correct way to handle this is to run the tasks you plan to checkpoint in the pid namespace (with /proc tune-up if required) from the very beginning.

Having said the above, the most correct way to handle this is to run the tasks you plan to checkpoint in the pid namespace (with /proc tune-up if required) from the very beginning.