[CRIU] Ghost file: no such file or directory

[Pavel Emelyanov]

On 03/30/2016 05:59 PM, Tycho Andersen wrote:
> On Wed, Mar 30, 2016 at 05:50:32PM +0300, Pavel Emelyanov wrote:
>> On 03/30/2016 05:46 PM, Tycho Andersen wrote:
>>> On Wed, Mar 30, 2016 at 05:26:15PM +0300, Pavel Emelyanov wrote:
>>>> On 03/30/2016 03:33 PM, Federico Reghenzani wrote:
>>>>> 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
>>>>
>>>> Can you check whether the \dirname of this path exists?
>>>> I mean this -- //tmp/openmpi-sessions-root at roaster-vm3_0/60995/1/
>>>>
>>>> Presumably this is the case when not only the file was removed, but also
>>>> some dir components. And we've fixed it only in 2.0.
>>>
>>> The users I had report it were using post 2.0, so there's some other
>>> bug here. I'm trying to reproduce now again, but not having any luck
>>> :(
>>
>> Do they also see the ENOENT errno from the open(O_CREAT) call?
> 
> Which call do you mean here? I don't see anything close to this that
> does an O_CREAT on dump.

Yes, because the error is on restore :) For 1.8 this is files-reg.c create_ghost()'s

	gfd = open(path, ghost_flags, gfe->mode);
        if (gfd < 0) {
                pr_perror("Can't open ghost file %s", path);
                goto err;
        }

-- Pavel