[CRIU] Ghost file: no such file or directory

[Federico Reghenzani]

I attached C code used in my application and I uploaded here the image:
https://www.dropbox.com/s/d3u4srrpv6vpj4q/tountar.tar.gz?dl=0

Maybe it's helpful.


Thank you,
Federico

__
Federico Reghenzani
M.Eng. Student @ Politecnico di Milano
Computer Science and Engineering



2016-03-30 15:40 GMT+02:00 Tycho Andersen <tycho.andersen at canonical.com>:

> On Wed, Mar 30, 2016 at 02:45:01PM +0200, Federico Reghenzani wrote:
> > Also, I think that ghost-file-3.img is suspicious because is too big:
> > ~140MB for a process that consumes ~4MB of ram, and the application does
> > nothing with shared memory (it only initializes the open mpi module).
> Also
> > the /tmp/openmpi-sessions-root at roaster-vm3_0 directory has a size of
> only
> > 256KB.
>
> But the ghost file means a file that has been deleted, so you won't
> see it if you do du of that directory, and it won't be in the RAM of
> the container.
>
> Anyway, w.r.t. the core issue of not being able to open the ghost
> file, I have had users report this to me as well, but have not been
> able to reproduce it myself.
>
> Tycho
>
> > __
> > Federico Reghenzani
> > M.Eng. Student @ Politecnico di Milano
> > Computer Science and Engineering
> >
> >
> >
> > 2016-03-30 14:33 GMT+02:00 Federico Reghenzani <
> > federico1.reghenzani at mail.polimi.it>:
> >
> > > 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
> > >
> > >
> > >
> > >
>
> > _______________________________________________
> > CRIU mailing list
> > CRIU at openvz.org
> > https://lists.openvz.org/mailman/listinfo/criu
>
>
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