strace -f shows that /proc/sys/fs/ocfs2/nm/hb_path_ctl is not found and therefore the mount fails. This functionality has been moved into a new module ocfs2_stackglue, which is not loaded in /etc/init.d/o2cb.
To fix this problem simply add "load_module ocfs2_stackglue" to the LOAD_ACTIONS in /etc/init.d/o2cb.
strace -f shows that /proc/sys/ fs/ocfs2/ nm/hb_path_ ctl is not found and therefore the mount fails. This functionality has been moved into a new module ocfs2_stackglue, which is not loaded in /etc/init.d/o2cb.
To fix this problem simply add "load_module ocfs2_stackglue" to the LOAD_ACTIONS in /etc/init.d/o2cb.