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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