lwIP PROBLEM (pbuf)

[Altera_Forum]

Hello, I'm using LWIP 1.1.1 on Nios II 5.1 version. 

 For unknown reason, I often have some pbuf assertion failure "pbuf sane flags" when the function pbuf_free is called.  On the LWIP dev community someone has said to me that there is a bug with NIOS 2 data cache.  He has said to me that a patch was available.  Anybody has this patch ? Do you already have these assertions failure ?  Thank you  Etienne

[Altera_Forum]

It may be the problem of the data cache... 

 try to update your Quartus and especially nios II distribution to the latest one. also apply all the service packs!  bye  PJ