[CRIU] link_remap_ok

[beproject criu]

path [/usr/local/lib/lxc/rootfs/root] read_fd_link() return : 30
I have mounted the /dev of host on /dev inside my container.

(03.347637) Dumping path for 4 fd via self 43
[/usr/local/lib/lxc/rootfs/root/dev/__properties__]
(03.347847) [nyc_fd] The required root is already opened. get_service_fd()
returns : 1017
(03.348197) [nyc_fd] Going into fstatat()-> [mntns_root : 1017],[rpath :
./usr/local/lib/lxc/rootfs/root/dev/__properties__]
(03.348393) [nyc_fd] Out of fstatat()-> [ret : -1],[rpath :
./usr/local/lib/lxc/rootfs/root/dev/__properties__]
(03.348583) [nyc_fd] Going into dump_linked_remap()
(03.349177) [nyc_fd] The required root is already opened. get_service_fd()
returns : 1017
(03.349432) [nyc_fd] Doing linkat() [mntns_root : 1017],[link_name :
./usr/local/lib/lxc/rootfs/root/dev/link_remap.4]

(03.349756) [nyc_fd] bad_path [/usr/local/lib/lxc/rootfs/root]
,read_fd_link() return : 30

(03.350027) Error (files-reg.c:515): Can't link remap to
/usr/local/lib/lxc/rootfs/root/dev/__properties__: No such file or directory
(03.351097) [nyc_fd] Error in dump_one_reg_file->check_path_remap()
(03.351266) [nyc_fd] Going into dump_task_files_seized() : dump_one_file()


On Fri, Feb 27, 2015 at 8:10 PM, Pavel Emelyanov <xemul at parallels.com>
wrote:

> On 02/27/2015 05:25 PM, beproject criu wrote:
> > This is the flow before error,could you get what's wrong :
> >
> > (02.352922) Dumping path for 4 fd via self 43
> [/usr/local/lib/lxc/rootfs/root/dev/__properties__]
> > (02.353079) [nyc_fd] The required root is already opened.
> get_service_fd() returns : 1017
> > (02.353216) [nyc_fd] Going into fstatat()-> [mntns_root : 1017],[rpath :
> ./usr/local/lib/lxc/rootfs/root/dev/__properties__]
> > (02.353398) [nyc_fd] Out of fstatat()-> [ret : -1],[rpath :
> ./usr/local/lib/lxc/rootfs/root/dev/__properties__]
> > (02.353574) [nyc_fd] Going into dump_linked_remap()
> > (02.354191) [nyc_fd] The required root is already opened.
> get_service_fd() returns : 1017
> > (02.354431) [nyc_fd] Doing linkat() [mntns_root : 1017],[link_name :
> ./usr/local/lib/lxc/rootfs/root/dev/link_remap.4]
> > (02.354747) Error (files-reg.c:510): Can't link remap to
> /usr/local/lib/lxc/rootfs/root/dev/__properties__: No such file or directory
> > (02.355915) [nyc_fd] Error in dump_one_reg_file->check_path_remap()
> > (02.356066) [nyc_fd] Going into dump_task_files_seized() :
> dump_one_file()
>
> OK, so in both cases we access file af fd 1017 and sub-path
> "./user/local/lib/lxc/roootfs/root/dev/__properties__"
> and you tell that this file actually exists in container, right?
>
> The failing fstatat then means, that the 1017 descriptor points to some
> bad path. Can you check where? We
> have a helper called read_fd_link() helper for that, see the fsnotify.c
> line 455 for code example.
>
> And one more question -- does your container live in another mount
> namespace, or shared one with host?
>
> Thanks,
> Pavel
>
>
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