Re: [lwip-users] Assertion "memp sanity" failed at line 463 in ../lwip_1_4_0/Src/core/memp.c

[Sylvain Rochet]

Hi,

On Fri, Nov 16, 2012 at 10:28:17AM +0100, Mikael Eiman wrote:
> Hi,
> 
> I had a similar problem recently, and in my case I was first using 
> lwIP functions from multiple threads (it's not thread safe, don't do 
> that), and then causing a double free() by calling essentially 
> tcp_close() twice on the same handle. My guess: you're corrupting 
> memory somewhere, somehow.

Another hint, SYS_LIGHTWEIGHT_PROT must be set if you are allocating 
memory from threads other than the lwIP core "TCPIP" thread.

Sylvain

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