Dear Developers We are experiencing opensm (V 3.3.21 ) crash from time to time on debian hosts, our developers suspect that it's something at lash algorithm, Please can you advise a fix here. Also we are using m_key Protection feature , short info from crash report Signal: 11 SourcePackage: opensm Stacktrace: #0 0x00005636f04835a9 in get_next_switch (p_lash=0x1, link=<optimized out>, sw=0) at osm_ucast_lash.c:337 No locals. #1 generate_cdg_for_sp (p_lash=p_lash@entry=0x5636f0eef0b0, sw=sw@entry=0, dest_switch=dest_switch@entry=1, lane=lane@entry=0) a t osm_ucast_lash.c:337 num_switches = 13 switches = 0x7f501c2a7d20 cdg_vertex_matrix = 0x7f501c2d0e00 next_switch = <optimized out> output_link = <optimized out> j = <optimized out> exists = <optimized out> v = <optimized out> prev = 0x0 #2 0x00005636f0484aa8 in lash_core (p_lash=<optimized out>) at osm_ucast_lash.c:842 lanes_needed = 1 k = <optimized out> dest_switch = 1 output_link = <optimized out> cycle_found2 = <optimized out> num_switches = <optimized out> switches = <optimized out> output_link2 = <optimized out> attached is a crash dump and opensm conf for your reference. Please advise here with a possible solution, help much appreciated. Thank you in advance Best Regards Ram Boinipelli