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)
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):
Obtain machine with the same layout as I have
Steps to Reproduce:
1. umount -f /home
Filesystem should be unmounted
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