kernel: Argh. No free space left for GC error

Hi,

I'm running stock RT-N66U (3.0.0.4.382_51641-g46d2311) and recently I'm getting this error every few seconds,

Dec 7 17:01:02 kernel: Argh. No free space left for GC. nr_erasing_blocks is 0. nr_free_blocks is 0. (erasableempty: yes, erasingempty: yes, erasependingempty: yes)
Dec 7 17:01:03 kernel: jffs2_reserve_space_gc of 55 bytes for garbage_collect_dirent failed: -28
Dec 7 17:01:03 kernel: Argh. No free space left for GC. nr_erasing_blocks is 0. nr_free_blocks is 0. (erasableempty:...

kernel: Argh. No free space left for GC error