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SubjectQuestion regarding container affecting the host system mounts
I came across a problem where if the containers are running then it
affects the unmount process of the system's mount points. I am not
using these mount points as shared mounts with container.

For example, I am using SD card and NAND as external storage device
and mounting it to a mount point in the ramfs. Then I am launching
containers and then when I try to unmount the NAND partition then my
"unmount" call succeeds but I don't see the UBIFS hooks being called
and because of that my UBI detach process fails. When I stopped the
container then I see that kernel is calling the unmount as I see my
debug prints inside the UBIFS for unmounting that partition.

If I tried to mount my NAND partition once the container is up and try
to unmount then it does unmount and detach without issue. It seems
like there is an issue with namespace.

I am using 4.1.8 kernel . I traced the kernel code and I see that
copy_mnt_ns is calling copy_tree and which basically increasing the
active counts of the super block of my host mount points (NAND, SD cards).
I am using container but I do not wish to share any of my host storage
media with
container so in my container configuration I am only mounting the
tmpfs as the rootfs of container is in in tmpfs of host. But, still I
can't umount completely my host storage media if containers are
running.

I have attached the log of the container start process with debugging
and where you can see it is increasing the super block active counts
for "ubifs".

--
Ronak A Desai
Sr. Software Engineer
Airborne Information Solutions / RC Linux Platform Software
MS 131-100, C Ave NE, Cedar Rapids, IA, 52498, USA

Ronak.Desai@rockwellcollins.com

https://www.rockwellcollins.com/
Starting lxc1 Application: ---> alloc_super, 220, atomic_read(&s->s_active) = 1, name =
---> vfs_kern_mount, 953
---> fs/namespace.c, copy_mnt_ns, 2875
---> fs/namespace.c, copy_tree, 1742
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = rootfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = devtmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = devpts
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = tmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = proc
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = tmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = tmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = tmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = sysfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = tmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = ubifs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = ubifs
---> alloc_super, 220, atomic_read(&s->s_active) = 1, name =
EXT3-fs (loop0): error: can't find ext3 filesystem on dev loop0.
---> deactivate_locked_super, 284
---> deactivate_locked_super, 288
---> kill_block_super, 1050
---> generic_shutdown_super, 409
---> deactivate_locked_super, 299
---> deactivate_locked_super, 301
---> alloc_super, 220, atomic_read(&s->s_active) = 1, name =
EXT2-fs (loop0): error: can't find an ext2 filesystem on dev loop0.
---> deactivate_locked_super, 284
---> deactivate_locked_super, 288
---> kill_block_super, 1050
---> generic_shutdown_super, 409
---> deactivate_locked_super, 299
---> deactivate_locked_super, 301
---> alloc_super, 220, atomic_read(&s->s_active) = 1, name =
EXT4-fs (loop0): VFS: Can't find ext4 filesystem
---> deactivate_locked_super, 284
---> deactivate_locked_super, 288
---> kill_block_super, 1050
---> generic_shutdown_super, 409
---> deactivate_locked_super, 299
---> deactivate_locked_super, 301
---> alloc_super, 220, atomic_read(&s->s_active) = 1, name =
---> vfs_kern_mount, 953
device veth4YTWEM entered promiscuous mode
---> kern_unmount, 3251
---> mntput_no_expire, 1144
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 321
---> deactivate_super, 323
---> deactivate_locked_super, 284
---> deactivate_locked_super, 288
---> kill_anon_super, 896
---> generic_shutdown_super, 409
---> generic_shutdown_super, 415
---> deactivate_locked_super, 299
---> deactivate_locked_super, 301
---> cleanup_mnt, 1075
device vethXAIUQR entered promiscuous mode
lxcbr1: port 1(vethXAIUQR) entered forwarding state
lxcbr1: port 1(vethXAIUQR) entered forwarding state
lxcbr1: port 1(vethXAIUQR) entered disabled state
---> fs/namespace.c, copy_mnt_ns, 2875
---> fs/namespace.c, copy_tree, 1742
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 4, name = rootfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 4, name = devtmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 4, name = devpts
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = tmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 4, name = proc
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = tmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = tmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = tmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = loop0
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = sysfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = tmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = cgroup
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = ubifs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = ubifs
---> alloc_super, 220, atomic_read(&s->s_active) = 1, name =
---> vfs_kern_mount, 953
---> alloc_super, 220, atomic_read(&s->s_active) = 1, name =
---> vfs_kern_mount, 953
---> free_user_ns, 147
---> free_user_ns, 149
---> free_user_ns, 147
---> free_user_ns, 149
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = loop0
eth0: renamed from vethQMW0V2
eth3: renamed from veth6AR9T2
lxcbr0: port 1(veth4YTWEM) entered forwarding state
lxcbr0: port 1(veth4YTWEM) entered forwarding state
lxcbr1: port 1(vethXAIUQR) entered forwarding state
lxcbr1: port 1(vethXAIUQR) entered forwarding state
---> alloc_super, 220, atomic_read(&s->s_active) = 1, name =
---> vfs_kern_mount, 953
---> grab_super, 353, atomic_read(&s->s_active) = 2, name = proc
---> vfs_kern_mount, 953
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = proc
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 4, name = proc
---> attach_mnt, 862
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 5, name = proc
---> alloc_super, 220, atomic_read(&s->s_active) = 1, name =
---> vfs_kern_mount, 953
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 4, name = tmpfs
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 5, name = devtmpfs
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 6, name = devtmpfs
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 7, name = devtmpfs
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 8, name = devtmpfs
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 9, name = devtmpfs
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 10, name = devtmpfs
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 5, name = devpts
---> fs/namespace.c, do_loopback, 2176
---> fs/namespace.c, copy_tree, 1742
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 4, name = loop0
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = tmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 11, name = devtmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 12, name = devtmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 13, name = devtmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 14, name = devtmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 15, name = devtmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 16, name = devtmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 6, name = devpts
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 6, name = proc
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 7, name = proc
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 8, name = proc
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 9, name = proc
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = tmpfs
---> fs/namespace.c, copy_tree, 1773
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 5, name = tmpfs
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> do_umount, 1502
---> umount_tree, 1441
---> umount_tree, 1444
---> propagate_mount_unlock, 381
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1450
---> umount_tree, 1457
---> umount_tree, 1457
---> umount_tree, 1457
---> umount_tree, 1457
---> umount_tree, 1457
---> umount_tree, 1457
---> umount_tree, 1457
---> umount_tree, 1457
---> umount_tree, 1457
---> umount_tree, 1457
---> umount_tree, 1457
---> umount_tree, 1457
---> umount_tree, 1457
---> umount_tree, 1457
---> umount_tree, 1457
---> __propagate_umount, 421
---> __propagate_umount, 421
---> __propagate_umount, 421
---> __propagate_umount, 421
---> __propagate_umount, 421
---> __propagate_umount, 421
---> __propagate_umount, 421
---> __propagate_umount, 421
---> __propagate_umount, 421
---> __propagate_umount, 421
---> __propagate_umount, 421
---> __propagate_umount, 421
---> __propagate_umount, 421
---> __propagate_umount, 421
---> __propagate_umount, 421
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1427
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> umount_tree, 1475
---> disconnect_mount, 1409
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> drop_mountpoint, 199
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> drop_mountpoint, 199
---> mntput_no_expire, 1135
---> SYSC_umount, 1688
---> mntput_no_expire, 1135
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 1, name = tmpfs
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 15, name = devtmpfs
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 14, name = devtmpfs
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 13, name = devtmpfs
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 12, name = devtmpfs
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 11, name = devtmpfs
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 10, name = devtmpfs
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 5, name = devpts
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 8, name = proc
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 7, name = proc
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 6, name = proc
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 5, name = proc
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 1, name = tmpfs
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 4, name = tmpfs
---> cleanup_mnt, 1075
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 3, name = loop0
---> cleanup_mnt, 1075
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> SYSC_umount, 1688
---> alloc_super, 220, atomic_read(&s->s_active) = 1, name =
---> vfs_kern_mount, 953
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 2, name = devpts
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 3, name = devpts
---> fs/namespace.c, do_loopback, 2181
---> clone_mnt, 1011, atomic_read(&sb->s_active) = 4, name = devpts

##################### umount call is successful but it does not call the UBIFS unmount as it fails in deactivate_super ##################
# umount /opt/logging/
---> do_umount, 1502
---> propagate_mount_busy, 344
---> do_refcount_check, 324
---> umount_tree, 1441
---> umount_tree, 1444
---> propagate_mount_unlock, 381
---> umount_tree, 1450
---> umount_tree, 1457
---> __propagate_umount, 421
---> umount_tree, 1475
---> disconnect_mount, 1392
---> umount_tree, 1477
---> umount_mnt, 834
---> umount_tree, 1490
---> drop_mountpoint, 199
---> SYSC_umount, 1688
---> mntput_no_expire, 1135
---> __cleanup_mnt, 1082
---> cleanup_mnt, 1063
---> cleanup_mnt, 1069
---> cleanup_mnt, 1071
---> cleanup_mnt, 1073
---> deactivate_super, 328, atomic_read(&s->s_active) = 2, name = ubifs
---> cleanup_mnt, 1075
#

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