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If an task has opened or mapped any character or block device, this typically means, it wants some connection to the hardware. In this case dump (and restore) is impossible. The exception is virtual devices like null, zero, etc. and TUN network device (used by OpenVPN).
If an task has opened or mapped any character or block device, this typically means, it wants some connection to the hardware. In this case dump (and restore) is impossible. The exception is virtual devices like null, zero, etc. and TUN network device (used by OpenVPN).
== Tasks with debugger attached ==
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.