GFS2 file system fails to unmount and reports "Unmount seems to be stalled. Dumping lock state..." in RHEL 5

Issue

• When I shutdown or reboot my node, it hangs on unmounting file systems with the error "Unmount seems to be stalled. Dumping lock state..."
• The filesystem would not unmount and the following error was emitted to the console:

kernel: GFS2: fsid=SCCL01:SCCL01PAPEFS.6: Unmount seems to be stalled. Dumping lock state...
kernel:  G:  s:SH n:5/18 f:qO t:SH d:EX/0 l:0 a:0 r:2 m:200
kernel:   H: s:SH f:EH e:0 p:25863 [(ended)] gfs2_inode_lookup+0x11a/0x284 [gfs2]
kernel:  G:  s:UN n:2/17 f:qO t:UN d:EX/0 l:0 a:0 r:1 m:200
kernel:  G:  s:SH n:5/17 f:qO t:SH d:EX/0 l:0 a:0 r:2 m:200
kernel:   H: s:SH f:EH e:0 p:25863 [(ended)] gfs2_inode_lookup+0x11a/0x284 [gfs2]
kernel:  G:  s:UN n:2/18 f:qO t:UN d:EX/0 l:0 a:0 r:1 m:150