Summary: Has anyone looked at/actively looking at the 32-bit boundary memory alignment requirement for the ARM architecture? Detail: I am running freeswitch on an ARM platform (dockstar based on Marvell Kirkwood). I have compiled and tested both freeswitch-1.0.6 and freeswitch-head(1,2), and found that stun lookups were failing with a "Timeout" error. Debugging the issue points to memory alignment issues specific to the ARM architecture. Basically, due to the fact that the uint8_t array "buf", is not aligned at a 32-bit memory boundary, the stun lookup packet sent to the stun server was malformed. Web searches confirm that a symptom of misaligned access on ARM is an apparent memory corruption. This can be fixed by forcing alignment of specific variables to 32-bit boundary. As an example, in the switch_stun_lookup function of file src/switch_stun.c , we currently have { switch_sockaddr_t *local_addr = NULL, *remote_addr = NULL, *from_addr = NULL; switch_socket_t *sock = NULL; uint8_t buf[260] = { 0 }; .... } If I change it to { switch_sockaddr_t *local_addr = NULL, *remote_addr = NULL, *from_addr = NULL; switch_socket_t *sock = NULL; uint8_t buf[260] __attribute__ (aligned(4)) = { 0 }; .... } or { switch_sockaddr_t *local_addr = NULL, *remote_addr = NULL, *from_addr = NULL; switch_socket_t *sock = NULL; uint8_t *buf; buf = (uint8_t*) malloc(sizeof(uint8_t)*260); .... } the stun lookup packet sent is correct.freeswitch is also able to parse the recvd packet and correctly determines the external IP. Random crashes coupled with looking at the code in switch_rtp suggests that the memory alignment issue may not be limited to this function or even this file. Has anyone looked at ARM memory alignment issues for freeswitch in general? cheers, -m (1) Current head leads to the situation where call gets connected but there is no-audio. I have not had the chance to debug this, but suspect this could be due to the "eat rtp .... " patch combined with ARM memory alignment issues. (2) The tested (audio working, some issues) git version is commit 715d250e171a94736b19019ac742f739899ad997 Author: Mathieu Parent <math.parent@gmail.com> Date: Wed Dec 15 21:29:52 2010 +0100