ls: can't open '.': Cannot allocate memory

Hi,

Just like the mail subject says, I'm getting a lot of these errors
when 'ls'ing' NFS mounts (but only NFS mounts).

Full error sample text:

# ls
ls: page allocation failure: order:8, mode:0xd0
Call Trace:
        [<008446e8>] 0x8446e8
 [<0084683a>] 0x84683a
 [<00851e34>] 0x851e34
 [<008526c2>] 0x8526c2
 [<008526c2>] 0x8526c2

        [<0084e200>] 0x84e200
 [<0085270a>] 0x85270a
 [<008127d2>] 0x8127d2

Mem-Info:
DMA per-cpu:
CPU    0: hi:    0, btch:   1 usd:   0
active_anon:0 inactive_anon:0 isolated_anon:0
 active_file:0 inactive_file:16 isolated_file:0
 unevictable:1 dirty:0 writeback:0 unstable:0
 free:1340 slab_reclaimable:24 slab_unreclaimable:255
 mapped:0 shmem:0 pagetables:0 bounce:0
 free_cma:0
DMA free:5360kB min:500kB low:624kB high:748kB active_anon:0kB
inactive_anon:0kB active_file:0kB inactive_file:64kB unevictable:4kB
isolated(anon):0kB isolated(file):0kB present:15704kB mlocked:0kB
dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:96kB
slab_unreclaimable:1020kB kernel_stack:84kB pagetables:0kB
unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0
all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 36*4kB 30*8kB 29*16kB 21*32kB 6*64kB 7*128kB 4*256kB 3*512kB
0*1024kB 0*2048kB 0*4096kB = 5360kB
17 total pagecache pages
2046 pages RAM
152 pages reserved
261998 pages shared
541 pages non-shared
Allocation of length 528384 from process 94 (ls) failed
DMA per-cpu:
CPU    0: hi:    0, btch:   1 usd:   0
active_anon:0 inactive_anon:0 isolated_anon:0
 active_file:0 inactive_file:16 isolated_file:0
 unevictable:1 dirty:0 writeback:0 unstable:0
 free:1340 slab_reclaimable:24 slab_unreclaimable:255
 mapped:0 shmem:0 pagetables:0 bounce:0
 free_cma:0
DMA free:5360kB min:500kB low:624kB high:748kB active_anon:0kB
inactive_anon:0kB active_file:0kB inactive_file:64kB unevictable:4kB
isolated(anon):0kB isolated(file):0kB present:15704kB mlocked:0kB
dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:96kB
slab_unreclaimable:1020kB kernel_stack:84kB pagetables:0kB
unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0
all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 36*4kB 30*8kB 29*16kB 21*32kB 6*64kB 7*128kB 4*256kB 3*512kB
0*1024kB 0*2048kB 0*4096kB = 5360kB
17 total pagecache pages
ls: can't open '.': Cannot allocate memory
#


call trace address description:

        [<008446e8>] 0x8446e8 (inside <warn_alloc_failed>)
 [<0084683a>] 0x84683a (inside <__alloc_pages_nodemask>)
 [<00851e34>] 0x851e34 (inside <do_mmap_pgoff>)
 [<008526c2>] 0x8526c2 <sys_old_mmap>
 [<008526c2>] 0x8526c2 <sys_old_mmap>

        [<0084e200>] 0x84e200 (inside <vm_mmap_pgoff>)
 [<0085270a>] 0x85270a (inside <sys_old_mmap>)
 [<008127d2>] 0x8127d2 (inside <enosys>)


Usually I have around 4 ~ 5 Mb free memory, so even if 'ls' needs
around 500k (like it says it needs in the dump - Allocation of length
528384 from process 94 (ls) failed) it would be enough.
Using busybox 'ls'.

Any sugestion?

Regards,
Luis
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