<div dir="ltr">Is this ok?<br><div><br>/sdcard # lxc-attach -n L -- cat /proc/self/mountinfo <br>16 16 0:2 / / rw - rootfs rootfs rw,size=372900k,nr_inodes=93225<br>17 16 0:4 / /proc rw,relatime - proc proc rw<br>18 16 0:11 / /sys rw,relatime - sysfs sysfs rw<br>19 18 0:12 / /sys/fs/cgroup rw,relatime - cgroup none rw,cpuset,debug,cpu,cpuacct,memory,devices,freezer,blkio,perf_event,clone_children<br>20 18 0:6 / /sys/kernel/debug rw,relatime - debugfs none rw<br>21 16 0:10 / /dev/pts rw,relatime - devpts devpts rw,mode=600,ptmxmode=000<br>22 16 179:0 / /sdcard rw,relatime - ext2 /dev/mmcblk0 rw<br>24 16 0:2 /usr/local/lib/lxc/rootfs /usr/local/lib/lxc/rootfs rw - rootfs rootfs rw,size=372900k,nr_inodes=93225<br>25 24 0:14 / /usr/local/lib/lxc/rootfs rw,relatime - tmpfs none rw,size=12k,mode=755<br>35 25 179:0 /L/rootfs /usr/local/lib/lxc/rootfs/root rw,relatime shared:1 - ext2 /dev/mmcblk0 rw<br>36 35 0:13 / /usr/local/lib/lxc/rootfs/root/proc rw,relatime shared:2 - proc none rw<br>37 35 0:15 / /usr/local/lib/lxc/rootfs/root/sys rw,relatime shared:3 - sysfs none rw<br>38 35 0:2 /dev /usr/local/lib/lxc/rootfs/root/dev rw,relatime shared:6 - rootfs rootfs rw,size=372900k,nr_inodes=93225<br>39 38 0:10 /1 /usr/local/lib/lxc/rootfs/root/dev/console rw,relatime shared:7 - devpts devpts rw,mode=600,ptmxmode=000<br>26 37 0:6 / /usr/local/lib/lxc/rootfs/root/sys/kernel/debug rw,relatime shared:4 - debugfs debugfs rw<br>27 37 0:16 / /usr/local/lib/lxc/rootfs/root/sys/fs/cgroup rw,relatime shared:5 - tmpfs none rw,mode=750,gid=1000<br>28 35 0:17 / /usr/local/lib/lxc/rootfs/root/mnt/asec rw,relatime shared:8 - tmpfs tmpfs rw,mode=755,gid=1000<br>29 35 0:18 / /usr/local/lib/lxc/rootfs/root/mnt/obb rw,relatime shared:9 - tmpfs tmpfs rw,mode=755,gid=1000<br>30 35 31:0 / /usr/local/lib/lxc/rootfs/root/system ro,relatime shared:10 - ext4 /dev/block/mtdblock0 ro,data=ordered<br>31 35 31:1 / /usr/local/lib/lxc/rootfs/root/data rw,nosuid,nodev,noatime shared:11 - ext4 /dev/block/mtdblock1 rw,data=ordered<br>32 35 31:2 / /usr/local/lib/lxc/rootfs/root/cache rw,nosuid,nodev,noatime shared:12 - ext4 /dev/block/mtdblock2 rw,data=ordered<br><br>/sdcard # cat /proc/self/mountinfo <br>1 1 0:2 / / rw - rootfs rootfs rw,size=372900k,nr_inodes=93225<br>10 1 0:4 / /proc rw,relatime - proc proc rw<br>11 1 0:11 / /sys rw,relatime - sysfs sysfs rw<br>12 11 0:12 / /sys/fs/cgroup rw,relatime - cgroup none rw,cpuset,debug,cpu,cpuacct,memory,devices,freezer,blkio,perf_event,clone_children<br>13 11 0:6 / /sys/kernel/debug rw,relatime - debugfs none rw<br>14 1 0:10 / /dev/pts rw,relatime - devpts devpts rw,mode=600,ptmxmode=000<br>15 1 179:0 / /sdcard rw,relatime - ext2 /dev/mmcblk0 rw<br>/sdcard #<br><br><br>I have this line in my lxc.conf<br>lxc.mount.entry=/dev /sdcard/L/rootfs/dev none defaults,bind 0 0<br></div><div><br><br></div><div>Thanks.<br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Feb 28, 2015 at 1:20 AM, Pavel Emelyanov <span dir="ltr"><<a href="mailto:xemul@parallels.com" target="_blank">xemul@parallels.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On 02/27/2015 08:05 PM, beproject criu wrote:<br>
> path [/usr/local/lib/lxc/rootfs/root] read_fd_link() return : 30<br>
> I have mounted the /dev of host on /dev inside my container.<br>
<br>
</span>That's interesting. How did you do it? Can you show me the mount namespaces<br>
layout on your node and inside the container? It's just /proc/$pid/mountinfo<br>
file contents on some process on host and some process in CT.<br>
<span class=""><br>
> (03.347637) Dumping path for 4 fd via self 43 [/usr/local/lib/lxc/rootfs/root/dev/__properties__]<br>
<br>
</span>OK, this is quite strange. The /usr/local/lib/lxc/rootfs is the path on HOST.<br>
How did this path become visible inside container?<br>
<span class="im HOEnZb"><br>
> (03.347847) [nyc_fd] The required root is already opened. get_service_fd() returns : 1017<br>
> (03.348197) [nyc_fd] Going into fstatat()-> [mntns_root : 1017],[rpath : ./usr/local/lib/lxc/rootfs/root/dev/__properties__]<br>
> (03.348393) [nyc_fd] Out of fstatat()-> [ret : -1],[rpath : ./usr/local/lib/lxc/rootfs/root/dev/__properties__]<br>
> (03.348583) [nyc_fd] Going into dump_linked_remap()<br>
> (03.349177) [nyc_fd] The required root is already opened. get_service_fd() returns : 1017<br>
> (03.349432) [nyc_fd] Doing linkat() [mntns_root : 1017],[link_name : ./usr/local/lib/lxc/rootfs/root/dev/link_remap.4]<br>
><br>
> (03.349756) [nyc_fd] bad_path [/usr/local/lib/lxc/rootfs/root] ,read_fd_link() return : 30<br>
><br>
> (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<br>
> (03.351097) [nyc_fd] Error in dump_one_reg_file->check_path_remap()<br>
> (03.351266) [nyc_fd] Going into dump_task_files_seized() : dump_one_file()<br>
><br>
><br>
</span><div class="HOEnZb"><div class="h5">> On Fri, Feb 27, 2015 at 8:10 PM, Pavel Emelyanov <<a href="mailto:xemul@parallels.com">xemul@parallels.com</a> <mailto:<a href="mailto:xemul@parallels.com">xemul@parallels.com</a>>> wrote:<br>
><br>
> On 02/27/2015 05:25 PM, beproject criu wrote:<br>
> > This is the flow before error,could you get what's wrong :<br>
> ><br>
> > (02.352922) Dumping path for 4 fd via self 43 [/usr/local/lib/lxc/rootfs/root/dev/__properties__]<br>
> > (02.353079) [nyc_fd] The required root is already opened. get_service_fd() returns : 1017<br>
> > (02.353216) [nyc_fd] Going into fstatat()-> [mntns_root : 1017],[rpath : ./usr/local/lib/lxc/rootfs/root/dev/__properties__]<br>
> > (02.353398) [nyc_fd] Out of fstatat()-> [ret : -1],[rpath : ./usr/local/lib/lxc/rootfs/root/dev/__properties__]<br>
> > (02.353574) [nyc_fd] Going into dump_linked_remap()<br>
> > (02.354191) [nyc_fd] The required root is already opened. get_service_fd() returns : 1017<br>
> > (02.354431) [nyc_fd] Doing linkat() [mntns_root : 1017],[link_name : ./usr/local/lib/lxc/rootfs/root/dev/link_remap.4]<br>
> > (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<br>
> > (02.355915) [nyc_fd] Error in dump_one_reg_file->check_path_remap()<br>
> > (02.356066) [nyc_fd] Going into dump_task_files_seized() : dump_one_file()<br>
><br>
> OK, so in both cases we access file af fd 1017 and sub-path "./user/local/lib/lxc/roootfs/root/dev/__properties__"<br>
> and you tell that this file actually exists in container, right?<br>
><br>
> The failing fstatat then means, that the 1017 descriptor points to some bad path. Can you check where? We<br>
> have a helper called read_fd_link() helper for that, see the fsnotify.c line 455 for code example.<br>
><br>
> And one more question -- does your container live in another mount namespace, or shared one with host?<br>
><br>
> Thanks,<br>
> Pavel<br>
><br>
><br>
<br>
</div></div></blockquote></div><br></div>