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Description of problem:

I using RHEL6 (Clean install of RHEL6-20100715.x86_64 + updates) with btrfs / and /home.

In last few days I found out that halt is hanging on umount -f /home /boot.

So I tried out to umount filesystem from console (no process of lkocman should be running) manually but it failed.

I'm using following layout:

(T400 -- one disk)

rootvg ->
          lv_boot (ext4) /boot
          lv_root (btrfs) /
          lv_home (btrfs) /home -> 
                                  btrfs subvolume /home/lkocman

subvolume /home/lkocman contains also snapshots of /home/lkocman
         


Version-Release number of selected component (if applicable):

util-linux-ng-2.17.2-5.el6.x86_64
btrfs-progs-0.19-11.el6.x86_64
kernel-2.6.32-44.1.el6.x86_64


How reproducible:

Obtain machine with the same layout as I have

Steps to Reproduce:
1. umount -f /home
  
Actual results:

Hangs



Expected results:

Filesystem should be unmounted

Additional info:

Created attachment 433660 [details]
output of strace umount -f /home

umount -f /home is not hanging any more ... but it's showing that device is busy .... fuser /home is showing that no process is using /home

Created attachment 433661 [details]
dmesg output taken after executing umount -f /home

This problem no longer occur in 2.6.32-70.el6.x86_64. So I believe that it was fixed somewhere by upstream.

Closing as current-release