[CRIU] simple loop dump fail

[Nemo Wright]

​I tried criu wiki "Simple Loop" tutorial but ran into the following
problem:

(00.003078) lockinfo: 7:1 1 1731 fd:02:917857 0 EOF
(00.003085) lockinfo: 8:1 1 1731 fd:02:786673 1073741824 1073742335
(00.003092) lockinfo: 9:-1 1 1494 fd:02:920344 0 0
(00.003097) Error (proc_parse.c:1553): Unknown file lock!
(00.003129) Unlock network
(00.003134) Unfreezing tasks into 1
(00.003208) Error (cr-dump.c:1979): Dumping FAILED.

full log attached.
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