Re: ovl: mounting two times the same mount overlayfs will not list any directory entry anymore

[Jordi Pujol <jordipujolp@gmail.com>]

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Here is kernel v4.13 and one squashfs file

Thanks,

Jordi Pujol

On Thu, Sep 14, 2017 at 12:12 PM, Miklos Szeredi <miklos@szeredi.hu> wrote:
> On Tue, Sep 12, 2017 at 3:04 PM, Jordi Pujol <jordipujolp@gmail.com> wrote:
>> On Tue, Sep 12, 2017 at 12:47 PM, Amir Goldstein <amir73il@gmail.com> wrote:
>>
>>> So is this reproducible at every run with v4.13?
>> yes,
>>
>>> Are you able to try this without overlayfs? i.e. chroot to squashfs mount?
>> I have found the same in 4.12 when mounting only one squashfs image.
>> Therefore we could say that when working with previous versions
>> overlayfs was solving the problem in some way.
>
> Can you please post the contents of /proc/self/mountinfo?
>
> Thanks,
> Miklos

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root@pcjordi:notes# cat /proc/self/mountinfo > mountinfo-4.13.2-previous,txt
root@pcjordi:notes# mkdir /tmp/fs
root@pcjordi:notes# mount -o loop,ro /lnet/image/LneTLXQT64/00filesystem.squashfs /tmp/fs/     
root@pcjordi:notes# mount -o bind /tmp /tmp/fs/tmp/
root@pcjordi:notes# cat /proc/self/mountinfo > mountinfo-4.13.2-mount1,txt
root@pcjordi:notes# mount -o bind /tmp /tmp/fs/tmp/
root@pcjordi:notes# ls -lA /tmp/fs/
total 0
root@pcjordi:notes# cat /proc/self/mountinfo > mountinfo-4.13.2-mount2,txt

[-- Attachment #3: mountinfo-4.13.2-mount1,txt --]
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17 27 0:17 / /sys rw,nosuid,nodev,noexec,relatime shared:15 - sysfs sysfs rw
18 27 0:5 / /proc rw,nosuid,nodev,noexec,relatime shared:21 - proc proc rw
19 27 0:6 / /dev rw,nosuid,relatime shared:10 - devtmpfs udev rw,size=3913928k,nr_inodes=978482,mode=755
20 19 0:18 / /dev/pts rw,nosuid,noexec,relatime shared:11 - devpts devpts rw,gid=5,mode=620,ptmxmode=000
21 27 0:19 / /run rw,nosuid,noexec,relatime shared:13 - tmpfs tmpfs rw,size=786156k,mode=755
22 27 0:20 / /lnet rw,relatime shared:5 - tmpfs tmpfs rw,size=7861540k,mode=755
23 22 8:1 / /lnet/image ro,noatime shared:6 - ext2 /dev/sda1 ro,errors=continue,nouser_xattr,noacl
24 22 7:0 / /lnet/00filesystem.squashfs ro,noatime shared:7 - squashfs /dev/loop0 ro
25 22 7:1 / /lnet/10interfaces.squashfs ro,noatime shared:8 - squashfs /dev/loop1 ro
26 22 8:2 / /lnet/cowroot rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
27 1 0:21 / / rw,relatime shared:1 - overlay overlay rw,lowerdir=/lnet/00filesystem.squashfs:/lnet/10interfaces.squashfs,upperdir=/lnet/cowroot/LneTXFCECOW/upper,workdir=/lnet/cowroot/LneTXFCECOW/work,index=off
31 27 0:22 / /tmp rw,nosuid,nodev,relatime shared:2 - tmpfs tmpfs rw,size=7861540k
32 27 0:23 / /var/log rw,nosuid,relatime shared:3 - tmpfs tmpfs rw,size=7861540k,mode=755
33 27 0:24 / /var/tmp rw,nosuid,nodev,relatime shared:4 - tmpfs tmpfs rw,size=7861540k
34 17 0:7 / /sys/kernel/security rw,nosuid,nodev,noexec,relatime shared:16 - securityfs securityfs rw
35 19 0:25 / /dev/shm rw,nosuid,nodev shared:12 - tmpfs tmpfs rw
36 21 0:26 / /run/lock rw,nosuid,nodev,noexec,relatime shared:14 - tmpfs tmpfs rw,size=5120k
37 17 0:27 / /sys/fs/cgroup ro,nosuid,nodev,noexec shared:17 - tmpfs tmpfs ro,mode=755
38 37 0:28 / /sys/fs/cgroup/unified rw,nosuid,nodev,noexec,relatime shared:18 - cgroup2 cgroup rw
39 37 0:29 / /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime shared:19 - cgroup cgroup rw,xattr,name=systemd
40 17 0:30 / /sys/fs/pstore rw,nosuid,nodev,noexec,relatime shared:20 - pstore pstore rw
41 37 0:31 / /sys/fs/cgroup/cpu rw,nosuid,nodev,noexec,relatime shared:22 - cgroup cgroup rw,cpu
42 18 0:32 / /proc/sys/fs/binfmt_misc rw,relatime shared:23 - autofs systemd-1 rw,fd=31,pgrp=1,timeout=0,minproto=5,maxproto=5,direct
43 27 8:1 /LneTXFCE64 /boot ro,noatime shared:6 - ext2 /dev/sda1 ro,errors=continue,nouser_xattr,noacl
44 19 0:16 / /dev/mqueue rw,relatime shared:24 - mqueue mqueue rw
45 19 0:33 / /dev/hugepages rw,relatime shared:25 - hugetlbfs hugetlbfs rw,pagesize=2M
46 27 8:2 /LneTXFCEhome /home rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
47 17 0:8 / /sys/kernel/debug rw,relatime shared:26 - debugfs debugfs rw
48 43 8:1 /grub /boot/grub ro,noatime shared:6 - ext2 /dev/sda1 ro,errors=continue,nouser_xattr,noacl
49 23 8:1 /grub /lnet/image/LneTXFCE64/grub ro,noatime shared:6 - ext2 /dev/sda1 ro,errors=continue,nouser_xattr,noacl
50 46 8:2 /JPLive /home/JPLive rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
51 26 8:2 /JPLive /lnet/cowroot/LneTXFCEhome/JPLive rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
52 27 8:2 /JPLive/apt-lib-amd64 /var/lib/apt rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
53 27 8:2 /LneTXFCEhome/root /root rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
54 27 8:2 /JPLive/apt-cache-amd64 /var/cache/apt rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
55 27 8:2 /JPLive/var-spool /var/spool rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
232 21 0:37 / /run/user/1001 rw,nosuid,nodev,relatime shared:162 - tmpfs tmpfs rw,size=786152k,mode=700,uid=1001,gid=100
237 27 0:38 / /media/sshfs rw,nosuid,nodev,relatime shared:166 - fuse.sshfs livenet://home rw,user_id=0,group_id=0,allow_other
243 17 0:39 / /sys/fs/fuse/connections rw,relatime shared:170 - fusectl fusectl rw
248 31 7:2 / /tmp/fs ro,relatime shared:174 - squashfs /dev/loop2 ro
253 248 0:22 / /tmp/fs/tmp rw,nosuid,nodev,relatime shared:2 - tmpfs tmpfs rw,size=7861540k

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17 27 0:17 / /sys rw,nosuid,nodev,noexec,relatime shared:15 - sysfs sysfs rw
18 27 0:5 / /proc rw,nosuid,nodev,noexec,relatime shared:21 - proc proc rw
19 27 0:6 / /dev rw,nosuid,relatime shared:10 - devtmpfs udev rw,size=3913928k,nr_inodes=978482,mode=755
20 19 0:18 / /dev/pts rw,nosuid,noexec,relatime shared:11 - devpts devpts rw,gid=5,mode=620,ptmxmode=000
21 27 0:19 / /run rw,nosuid,noexec,relatime shared:13 - tmpfs tmpfs rw,size=786156k,mode=755
22 27 0:20 / /lnet rw,relatime shared:5 - tmpfs tmpfs rw,size=7861540k,mode=755
23 22 8:1 / /lnet/image ro,noatime shared:6 - ext2 /dev/sda1 ro,errors=continue,nouser_xattr,noacl
24 22 7:0 / /lnet/00filesystem.squashfs ro,noatime shared:7 - squashfs /dev/loop0 ro
25 22 7:1 / /lnet/10interfaces.squashfs ro,noatime shared:8 - squashfs /dev/loop1 ro
26 22 8:2 / /lnet/cowroot rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
27 1 0:21 / / rw,relatime shared:1 - overlay overlay rw,lowerdir=/lnet/00filesystem.squashfs:/lnet/10interfaces.squashfs,upperdir=/lnet/cowroot/LneTXFCECOW/upper,workdir=/lnet/cowroot/LneTXFCECOW/work,index=off
31 27 0:22 / /tmp rw,nosuid,nodev,relatime shared:2 - tmpfs tmpfs rw,size=7861540k
32 27 0:23 / /var/log rw,nosuid,relatime shared:3 - tmpfs tmpfs rw,size=7861540k,mode=755
33 27 0:24 / /var/tmp rw,nosuid,nodev,relatime shared:4 - tmpfs tmpfs rw,size=7861540k
34 17 0:7 / /sys/kernel/security rw,nosuid,nodev,noexec,relatime shared:16 - securityfs securityfs rw
35 19 0:25 / /dev/shm rw,nosuid,nodev shared:12 - tmpfs tmpfs rw
36 21 0:26 / /run/lock rw,nosuid,nodev,noexec,relatime shared:14 - tmpfs tmpfs rw,size=5120k
37 17 0:27 / /sys/fs/cgroup ro,nosuid,nodev,noexec shared:17 - tmpfs tmpfs ro,mode=755
38 37 0:28 / /sys/fs/cgroup/unified rw,nosuid,nodev,noexec,relatime shared:18 - cgroup2 cgroup rw
39 37 0:29 / /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime shared:19 - cgroup cgroup rw,xattr,name=systemd
40 17 0:30 / /sys/fs/pstore rw,nosuid,nodev,noexec,relatime shared:20 - pstore pstore rw
41 37 0:31 / /sys/fs/cgroup/cpu rw,nosuid,nodev,noexec,relatime shared:22 - cgroup cgroup rw,cpu
42 18 0:32 / /proc/sys/fs/binfmt_misc rw,relatime shared:23 - autofs systemd-1 rw,fd=31,pgrp=1,timeout=0,minproto=5,maxproto=5,direct
43 27 8:1 /LneTXFCE64 /boot ro,noatime shared:6 - ext2 /dev/sda1 ro,errors=continue,nouser_xattr,noacl
44 19 0:16 / /dev/mqueue rw,relatime shared:24 - mqueue mqueue rw
45 19 0:33 / /dev/hugepages rw,relatime shared:25 - hugetlbfs hugetlbfs rw,pagesize=2M
46 27 8:2 /LneTXFCEhome /home rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
47 17 0:8 / /sys/kernel/debug rw,relatime shared:26 - debugfs debugfs rw
48 43 8:1 /grub /boot/grub ro,noatime shared:6 - ext2 /dev/sda1 ro,errors=continue,nouser_xattr,noacl
49 23 8:1 /grub /lnet/image/LneTXFCE64/grub ro,noatime shared:6 - ext2 /dev/sda1 ro,errors=continue,nouser_xattr,noacl
50 46 8:2 /JPLive /home/JPLive rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
51 26 8:2 /JPLive /lnet/cowroot/LneTXFCEhome/JPLive rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
52 27 8:2 /JPLive/apt-lib-amd64 /var/lib/apt rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
53 27 8:2 /LneTXFCEhome/root /root rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
54 27 8:2 /JPLive/apt-cache-amd64 /var/cache/apt rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
55 27 8:2 /JPLive/var-spool /var/spool rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
232 21 0:37 / /run/user/1001 rw,nosuid,nodev,relatime shared:162 - tmpfs tmpfs rw,size=786152k,mode=700,uid=1001,gid=100
237 27 0:38 / /media/sshfs rw,nosuid,nodev,relatime shared:166 - fuse.sshfs livenet://home rw,user_id=0,group_id=0,allow_other
243 17 0:39 / /sys/fs/fuse/connections rw,relatime shared:170 - fusectl fusectl rw
248 31 7:2 / /tmp/fs ro,relatime shared:174 - squashfs /dev/loop2 ro
253 248 0:22 / /tmp/fs/tmp rw,nosuid,nodev,relatime shared:2 - tmpfs tmpfs rw,size=7861540k
258 253 0:22 / /tmp/fs/tmp rw,nosuid,nodev,relatime shared:2 - tmpfs tmpfs rw,size=7861540k
259 31 0:22 / /tmp rw,nosuid,nodev,relatime shared:2 - tmpfs tmpfs rw,size=7861540k

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17 27 0:17 / /sys rw,nosuid,nodev,noexec,relatime shared:15 - sysfs sysfs rw
18 27 0:5 / /proc rw,nosuid,nodev,noexec,relatime shared:21 - proc proc rw
19 27 0:6 / /dev rw,nosuid,relatime shared:10 - devtmpfs udev rw,size=3913928k,nr_inodes=978482,mode=755
20 19 0:18 / /dev/pts rw,nosuid,noexec,relatime shared:11 - devpts devpts rw,gid=5,mode=620,ptmxmode=000
21 27 0:19 / /run rw,nosuid,noexec,relatime shared:13 - tmpfs tmpfs rw,size=786156k,mode=755
22 27 0:20 / /lnet rw,relatime shared:5 - tmpfs tmpfs rw,size=7861540k,mode=755
23 22 8:1 / /lnet/image ro,noatime shared:6 - ext2 /dev/sda1 ro,errors=continue,nouser_xattr,noacl
24 22 7:0 / /lnet/00filesystem.squashfs ro,noatime shared:7 - squashfs /dev/loop0 ro
25 22 7:1 / /lnet/10interfaces.squashfs ro,noatime shared:8 - squashfs /dev/loop1 ro
26 22 8:2 / /lnet/cowroot rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
27 1 0:21 / / rw,relatime shared:1 - overlay overlay rw,lowerdir=/lnet/00filesystem.squashfs:/lnet/10interfaces.squashfs,upperdir=/lnet/cowroot/LneTXFCECOW/upper,workdir=/lnet/cowroot/LneTXFCECOW/work,index=off
31 27 0:22 / /tmp rw,nosuid,nodev,relatime shared:2 - tmpfs tmpfs rw,size=7861540k
32 27 0:23 / /var/log rw,nosuid,relatime shared:3 - tmpfs tmpfs rw,size=7861540k,mode=755
33 27 0:24 / /var/tmp rw,nosuid,nodev,relatime shared:4 - tmpfs tmpfs rw,size=7861540k
34 17 0:7 / /sys/kernel/security rw,nosuid,nodev,noexec,relatime shared:16 - securityfs securityfs rw
35 19 0:25 / /dev/shm rw,nosuid,nodev shared:12 - tmpfs tmpfs rw
36 21 0:26 / /run/lock rw,nosuid,nodev,noexec,relatime shared:14 - tmpfs tmpfs rw,size=5120k
37 17 0:27 / /sys/fs/cgroup ro,nosuid,nodev,noexec shared:17 - tmpfs tmpfs ro,mode=755
38 37 0:28 / /sys/fs/cgroup/unified rw,nosuid,nodev,noexec,relatime shared:18 - cgroup2 cgroup rw
39 37 0:29 / /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime shared:19 - cgroup cgroup rw,xattr,name=systemd
40 17 0:30 / /sys/fs/pstore rw,nosuid,nodev,noexec,relatime shared:20 - pstore pstore rw
41 37 0:31 / /sys/fs/cgroup/cpu rw,nosuid,nodev,noexec,relatime shared:22 - cgroup cgroup rw,cpu
42 18 0:32 / /proc/sys/fs/binfmt_misc rw,relatime shared:23 - autofs systemd-1 rw,fd=31,pgrp=1,timeout=0,minproto=5,maxproto=5,direct
43 27 8:1 /LneTXFCE64 /boot ro,noatime shared:6 - ext2 /dev/sda1 ro,errors=continue,nouser_xattr,noacl
44 19 0:16 / /dev/mqueue rw,relatime shared:24 - mqueue mqueue rw
45 19 0:33 / /dev/hugepages rw,relatime shared:25 - hugetlbfs hugetlbfs rw,pagesize=2M
46 27 8:2 /LneTXFCEhome /home rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
47 17 0:8 / /sys/kernel/debug rw,relatime shared:26 - debugfs debugfs rw
48 43 8:1 /grub /boot/grub ro,noatime shared:6 - ext2 /dev/sda1 ro,errors=continue,nouser_xattr,noacl
49 23 8:1 /grub /lnet/image/LneTXFCE64/grub ro,noatime shared:6 - ext2 /dev/sda1 ro,errors=continue,nouser_xattr,noacl
50 46 8:2 /JPLive /home/JPLive rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
51 26 8:2 /JPLive /lnet/cowroot/LneTXFCEhome/JPLive rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
52 27 8:2 /JPLive/apt-lib-amd64 /var/lib/apt rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
53 27 8:2 /LneTXFCEhome/root /root rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
54 27 8:2 /JPLive/apt-cache-amd64 /var/cache/apt rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
55 27 8:2 /JPLive/var-spool /var/spool rw,relatime shared:9 - ext4 /dev/sda2 rw,data=ordered
232 21 0:37 / /run/user/1001 rw,nosuid,nodev,relatime shared:162 - tmpfs tmpfs rw,size=786152k,mode=700,uid=1001,gid=100
237 27 0:38 / /media/sshfs rw,nosuid,nodev,relatime shared:166 - fuse.sshfs livenet://home rw,user_id=0,group_id=0,allow_other
243 17 0:39 / /sys/fs/fuse/connections rw,relatime shared:170 - fusectl fusectl rw