[CRIU] [PHAUL][BUG] P.Haul Test Code Fails with Simple Program

[John Goen]

In attempting to run the test program for P.Haul provided in its source
directory, I have run into the following issue:

    Setup:
        1. On a single VM with updated kernel and recent criu-dev branch,
build and run a simple program such as the one below (titled
test-migrate.c):
            #include <stdio.h>
            #include <unistd.h>

            int main() {
                unsigned long i = 0;
                while(1) {
                    printf("Iteration %u.\n", i++);
                    sleep(1);
                }
                return 0;
            }

        (NOTE: The provided setup with piggie.c failed for me with the
piggie program failing to spawn it's child process, returning -1, so I
opted for a simpler test program)

        2. In the phaul/ directory of CRIU, build and run the test with the
following commands:
            $ make test
            $ ./src/test/test `pidof test-migrate`

            The program should exit with the following printouts:
                Make server part (socket 4)
                Make client part (socket 3)
                Migrate
                S: start iter
                Failed: operation failed (msg: err:0)

    Pre-Dump Log:
        (00.000117) Enforcing memory tracking for pre-dump.
        (00.000161) Enforcing tasks run after pre-dump.
        (00.000204) irmap: Searching irmap cache in work dir
        (00.000224) No irmap-cache image
        (00.000233) irmap: Searching irmap cache in parent
        (00.000253) irmap: No irmap cache
        (00.000295) cpu: fpu:1 fxsr:1 xsave:1
        (00.000454) vdso: VDSO detection turned off
        (00.000464) Re-using ps socket 3
        (00.000524) Add net ns 1 pid 916
        (00.000546) Add mnt ns 2 pid 916
        (00.000566) Add pid ns 3 pid 916
        (00.000594) Error (criu/util.c:407): Can't open 32571: No such file
or directory
        (00.000622) Unfreezing tasks into 1
        (00.000635) Disconnect from the page server (null):0
        (00.000789) Error (criu/cr-dump.c:1625): Pre-dumping FAILED.

Not being knowledgeable in CRIU nor P.Haul, I'm unsure why CRIU is trying
to and cannot open the referenced file descriptor, and the empty return
message and error code 0 are unclear to me.

Please let me know if any additional information is required.

Also, if anyone knows of any known-working example of running P.Haul, I
would greatly appreciate any guidance in its usage.

Thanks,
John Goen
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