Hi everyone! I think I've hit a but in the remove_edge(u,v,bg) function in case I want to delete a self-edge. The following code crashes on my machine: using namespace boost; typedef adjacency_list ubase_graph_t; ubase_graph_t bg(5); add_edge(0, 1, bg); add_edge(1, 2, bg); add_edge(3, 4, bg); add_edge(4, 0, bg); add_edge(2, 2, bg); remove_edge(2, 2, bg); However, deleting via edge_descriptors is working: BGL_FORALL_OUTEDGES(2, ed, bg, ubase_graph_t) { if(target(ed, bg) == 2) { remove_edge(ed, bg); break; } } So what is wrong with remove_edge(u, u, bg) if there is a self-edge? My boost version is 1.34.1 and I am using g++ 4.1.2 on an ubuntu gutsy machine. Some info from gdb, but the output is just not usable to me - I have no clue what happens: *** glibc detected *** ../build/tools/gcc/debug/revTest: free(): invalid next size (fast): 0x08085420 *** ======= Backtrace: ========= /lib/tls/i686/cmov/libc.so.6[0xb743bd65] /lib/tls/i686/cmov/libc.so.6(cfree+0x90)[0xb743f800] /usr/lib/libstdc++.so.6(_ZdlPv+0x21)[0xb7603d81] ../build/tools/gcc/debug/revTest[0x804f943] ../build/tools/gcc/debug/revTest[0x804f978] ../build/tools/gcc/debug/revTest[0x8050c7f] ../build/tools/gcc/debug/revTest[0x8050cbf] ../build/tools/gcc/debug/revTest[0x80510f3] ../build/tools/gcc/debug/revTest[0x8051180] ../build/tools/gcc/debug/revTest[0x8049b4b] /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe0)[0xb73e8050] ../build/tools/gcc/debug/revTest(__gxx_personality_v0+0x81)[0x80497b1] Greetings, Sebastian