BOA errors in nios2-linux

i used the nios2-linux-20090730( in without mmu mode).tar to build with boa ,and add my web .

i could visit the web page , but would have some errors in the terminal window：

INFO: task boa:24 blocked for more than 120 seconds.

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

boa D 025cb9ac 0 24 1

Stack from 0229de50:<0>

<0> 022facc0<0> ffffe000<0> 021c9a30<0> 022fae50<0> 00000000<0> 0229dee4<

0> 00000000<0> deadbeef<0>

<0> 0229de7c<0> 025e8534<0> 02199a80<0> 00000002<0> 0229df38<0> 00000001<

0> ffffe000<0> 0229de94<0>

<0> 02199798<0> 7fffffff<0> 7fffffff<0> 0229ded8<0> 0219a7dc<0> 022fa6b4<

0> 02005654<0> 021c99e0<0>

<0> 022fa6ac<0> 022facc0<0> 0219d3b4<0> 021c9a30<0> 00000000<0> 00000002<

0> 0229df38<0> 7fffffff<0>

<0> ffffe000<0> 02199e98<0> 00000001<0> 022facc0<0> 0200b0d8<0> 0229df3c<

0> 0229df3c<0> 00000000<0>

<0> 022facc0<0> 0200b0d8<0> 00000000<0> 00000000<0> 025c117c<0> 00000000<

0> 00004000<0> 00000000<0>

Call Trace:<0>

<0> [<02199fc0>]<0> [<0200f62c>]<0> [<02001ed0>]<0> [<02000c10>]<0>

<0> [<020006c0>]<0>

the nios2-linux-20100621.tar tarball work in without mmu mode have the some erros.

the web pages in the 20080619 tarball can work fine .

i don't know why .

can you help me ?

arens