Hallo Simon, The corruptions seems to come from the shutdown function. I tracked this down with the MEMP_SANITY_CHECK.
I only got problems with the LWIP Stack when using the webserver. I've got other Applications which use TCPIP heavily didn't cause any problem (like JPEG/MJPEG streamer where I forgot to use shutdown) I've got following sequence in the webserver implementation: if (sp->sock >= 0) { ioctlsocket(sp->sock, FIONBIO, (void*)0); //removed for test if (shutdown(sp->sock, 1) >= 0) { //removed for test recv(sp->sock, buf, sizeof(buf), 0); //removed for test } close(sp->sock); } I removed for test purposes the shutdown and the LWIP stack runs for hours with the same test cases that led to crashes. It is not every shutdown crashing. It is sporadic. The call stack before the Assertion from MEMP_SANITY_CHECK is as follows: - tcpip_thread - lwip_netconn_do_delconn - lwip_netconn_do close_internal - tcp_close - tcp_close_shutdown - memp_free - do_memp_free_pool -> ASSERT In tcp_close_shutdown the pcb->state is already CLOSED But not using shutdown is not really a solution for me. Best regards, Sandra _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users