Messages in this thread |  | | From | Ronak Desai <> | Date | Thu, 29 Mar 2018 15:50:51 -0500 | Subject | Question regarding container affecting the host system mounts |
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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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