[CRIU] Ghost file: no such file or directory

[Federico Reghenzani]

Hi all!

We have problem restoring Open MPI daemons with child processes that uses
shared memory:

(00.022447)    255: Opening ghost file 0x3 for
tmp/openmpi-sessions-root at roaster-vm3_0
/60995/1/shared_mem_pool.roaster-vm3.1
(00.022479)    255: Error (files-reg.c:139): Can't open ghost file
//tmp/openmpi-sessions-root at roaster-vm3_0/60995/1/shared_mem_pool.roaster-vm3.1.cr.3.ghost:
No such file or directory
(00.022558)  `- X [/dev/shm/open_mpi.0000.cr.1.ghost] ghost
(00.022570)  `- X [/dev/shm/open_mpi.0001.cr.2.ghost] ghost
(00.022586) Error (files-reg.c:445):  `- XFail
[/tmp/openmpi-sessions-root at roaster-vm3_0/60995/1/shared_mem_pool.roaster-vm3.1.cr.3.ghost]
ghost: No such file or directory
(00.022595) Error (files-reg.c:445):  `- XFail
[/tmp/openmpi-sessions-root at roaster-vm3_0/60995/1/shared_mem_btl_module.roaster-vm3.1.cr.4.ghost]
ghost: No such file or directory
(00.022613) Error (files-reg.c:445):  `- XFail
[/dev/shm/open_mpi.0000.cr.5.ghost] ghost: No such file or directory
(00.022622) Error (cr-restore.c:1995): Restoring FAILED.

Full criu logs attached.

We are migrating to another machine, in unshared context (CLONE_NEWPID |
CLONE_NEWNS), CRIU version 1.8.



Any suggestions?
Cheers,
Federico
__
Federico Reghenzani
M.Eng. Student @ Politecnico di Milano
Computer Science and Engineering
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