Hi Anil, On Fri, Sep 07, 2012 at 11:09:47AM +0530, Anil kumar wrote: > We are using lwip as a linux kernel module in a multi threaded environment. > > Here is the sequence of events that are leading to the crash in my case. > > As the application is continuously sending data, do_write continuously > calls do_writemore, which internally calls tcp_write. At some point > tcp_write returns ERR_MEM and do_write waits on semaphore op_completed. > > [...] > > What could be the reason for the crash in the first case, is it i am > using lwip threads incorrectly ?
It looks like you are using the raw API with threads, raw API is -NOT- thread safe, you have to use netconn or socket API. Please read doc/rawapi.txt, but no worry, we all (At least I did) made the mistake until we find out this file :-) Also, if you are allocating pbuf outside of the lwIP thread, you have to set SYS_LIGHTWEIGHT_PROT=1 in your lwipopts.h Sylvain
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