Here's what I get with cupsys-dbg, and gnome-cups-manager and libgnomecups compiled with debug.
Thanks, Brice (gdb) thread apply all bt full Thread 2 (Thread -1255375952 (LWP 23773)): #0 0xb7f70410 in ?? () No symbol table info available. #1 0xb52b7108 in ?? () No symbol table info available. #2 0xb75a9918 in ?? () from /usr/lib/libcups.so.2 No symbol table info available. #3 0x00000008 in ?? () No symbol table info available. #4 0xb72f96f2 in time () from /lib/tls/i686/cmov/libc.so.6 No symbol table info available. #5 0xb758e3bc in httpRead2 (http=0x80b4db8, buffer=0xb52b719d "%-·´q+µ,[Z·\001v*·", length=8) at http.c:1166 bytes = <value optimized out> len = "\000\000\000\0008[Z·\003\000\000\000À\231\b\b\000\000\000\000\001\000\000\000H\222\t\b\037\000\000" #6 0xb75949f3 in ipp_read_http (http=0x80b4db8, buffer=0xb52b719d "%-·´q+µ,[Z·\001v*·", length=8) at ipp.c:2759 tbytes = 0 bytes = 0 len = "hq+µäôY·È\235Z·0]P·´q+µ\000\000\000\000\000\000\000\000\235q+µ" #7 0xb759454e in ippReadIO (src=0x80b4db8, cb=0xb7594860 <ipp_read_http>, blocking=1, parent=0x0, ipp=0x80bb9f8) at ipp.c:1054 n = <value optimized out> buffer = "%-·´q+µ,[Z·\001v*·\000\000\000\000\000\000\000\000\001\200û¼r+µ\000\000\000\000°r+µ°r+µ°r+µ°r+µ°r+µ\000\000\000\000\231\231\231\231\231\231\231\031\005", '\0' <repeats 11 times>, "èT\v\b", '\0' <repeats 16 times>, "\231\231\231\031¸M\v\b(r+µXÛ9·k\002\000\000\000\000\000\000\001\000\000\000ô\237:[EMAIL PROTECTED]:·\030\231Z·xr+µ5ïX·èT\v\b\000\000\000\000\n\000\000\000\000\000\000\000¯ò+µ\001\000\000\000\220{,µ"... string = "\200ûèT\v\bèT\v\bèT\v\bèT\v\bëT\v\bçU\v\bèT\v\bçU\v\b", '\0' <repeats 16 times>, "ä\004.·ü¸:·\000\000\000\000XõY·\000\000\000\b\000\000\000\000ð¸:·ø´:·¡ú-·\030\231Z·ÿÿÿÿø´:·9\000\000\000Ü´:·\000\000\000\000(\000\000\000Ô´:· \000\000\000 \221\v\b \000\000\0008\006:·\230\235\v\bXò+µ\034nX·À\231:·\000\000\000\000\000½\v\b\a\000\000\000Ô\005:·°\000\000\000À´\n\bÈò+µ\000\000\000\000\210}\v\b\221þ3·\003\000\000\000Èò+µ\234þ3·\001\000\000"... bufptr = <value optimized out> attr = <value optimized out> tag = <value optimized out> value_tag = <value optimized out> value = <value optimized out> #8 0xb759475d in ippRead (http=0xb75a9918, ipp=0x80bb9f8) at ipp.c:991 No locals. #9 0xb759e792 in cupsDoFileRequest (http=0x80b4db8, request=0x80bb738, resource=0x8075c50 "/", filename=0x0) at request.c:346 response = (ipp_t *) 0x80bb9f8 length = <value optimized out> status = HTTP_OK got_status = 0 state = IPP_DATA file = (FILE *) 0x0 fileinfo = {st_dev = 7371206394, __pad1 = 42104, __st_ino = 3039589160, st_mode = 3074974180, st_nlink = 127, st_uid = 3074974180, st_gid = 3039589240, st_rdev = 577991481722372527, __pad2 = 42104, st_size = -5391807557197055928, st_blksize = -1221723487, st_blocks = 0, st_atim = {tv_sec = 16, tv_nsec = 134980728}, st_mtim = {tv_sec = 1, tv_nsec = -1255378024}, st_ctim = {tv_sec = -1255378024, tv_nsec = -1219993116}, st_ino = 13199935153591287808} bytes = 3 buffer = '\0' <repeats 32444 times>, "Vç-·", '\0' <repeats 20 times>, "ä\004.·)\000\000\000ä´:·ä´:·\000\000\000\000ø´:·0", '\0' <repeats 11 times>, "ð¸:·ø´:·\000\000\000\000ô\237:·ä\004.·ø´:·9\000\000\000ä\004.·", '\0' <repeats 20 times>, "ð¸:·ø´:·\003\000\000\000ü¸:·ø·:·ø´:·\030\000\000\000Ì´:·ø´:·\001\b\000\000\030", '\0' <repeats 11 times>, "%*P·\bÁ[·\001\000\000\000\210r,µô\237:·À´:·aE\001\000¸r,µµ!.·ø´:·p¤\v\bX\000\000\000"... expect = HTTP_CONTINUE #10 0xb759ecf1 in cupsDoRequest (http=0x80b4db8, request=0x80bb738, resource=0x8075c50 "/") at request.c:451 No locals. #11 0xb75b54e8 in request_thread_main (request=0x80b3c90, unused=0x0) at gnome-cups-request.c:341 status = 3074077888 __PRETTY_FUNCTION__ = "request_thread_main" #12 0xb743fd27 in g_thread_pool_push () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #13 0xb743e36f in g_thread_create_full () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #14 0xb74ff267 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0 No symbol table info available. #15 0xb734745e in clone () from /lib/tls/i686/cmov/libc.so.6 No symbol table info available. Thread 1 (Thread -1228335424 (LWP 4222)): #0 0xb7f70410 in ?? () No symbol table info available. #1 0xbfd2d918 in ?? () No symbol table info available. #2 0x00000937 in ?? () No symbol table info available. #3 0x00000009 in ?? () No symbol table info available. #4 0xb733d4d3 in poll () from /lib/tls/i686/cmov/libc.so.6 No symbol table info available. #5 0xb7423859 in g_main_context_check () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #6 0xb7423be7 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #7 0xb7b65141 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0 No symbol table info available. #8 0x0804c021 in main (argc=3, argv=0xbfd2dae4) at gnome-cups-icon.c:136 No locals. #0 0xb7f70410 in ?? () (gdb) c Continuing. Program received signal SIGINT, Interrupt. [Switching to Thread -1228335424 (LWP 4222)] 0xb7f70410 in ?? () (gdb) thread apply all bt full Thread 2 (Thread -1255375952 (LWP 23773)): #0 0xb7f70410 in ?? () No symbol table info available. #1 0xb52b7108 in ?? () No symbol table info available. #2 0xb75a9918 in ?? () from /usr/lib/libcups.so.2 No symbol table info available. #3 0x00000008 in ?? () No symbol table info available. #4 0xb72f96f2 in time () from /lib/tls/i686/cmov/libc.so.6 No symbol table info available. #5 0xb758e3bc in httpRead2 (http=0x80b4db8, buffer=0xb52b719d "%-·´q+µ,[Z·\001v*·", length=8) at http.c:1166 bytes = <value optimized out> len = "\000\000\000\0008[Z·\003\000\000\000À\231\b\b\000\000\000\000\001\000\000\000H\222\t\b\037\000\000" #6 0xb75949f3 in ipp_read_http (http=0x80b4db8, buffer=0xb52b719d "%-·´q+µ,[Z·\001v*·", length=8) at ipp.c:2759 tbytes = 0 bytes = 0 len = "hq+µäôY·È\235Z·0]P·´q+µ\000\000\000\000\000\000\000\000\235q+µ" #7 0xb759454e in ippReadIO (src=0x80b4db8, cb=0xb7594860 <ipp_read_http>, blocking=1, parent=0x0, ipp=0x80bb9f8) at ipp.c:1054 n = <value optimized out> buffer = "%-·´q+µ,[Z·\001v*·\000\000\000\000\000\000\000\000\001\200û¼r+µ\000\000\000\000°r+µ°r+µ°r+µ°r+µ°r+µ\000\000\000\000\231\231\231\231\231\231\231\031\005", '\0' <repeats 11 times>, "èT\v\b", '\0' <repeats 16 times>, "\231\231\231\031¸M\v\b(r+µXÛ9·k\002\000\000\000\000\000\000\001\000\000\000ô\237:[EMAIL PROTECTED]:·\030\231Z·xr+µ5ïX·èT\v\b\000\000\000\000\n\000\000\000\000\000\000\000¯ò+µ\001\000\000\000\220{,µ"... string = "\200ûèT\v\bèT\v\bèT\v\bèT\v\bëT\v\bçU\v\bèT\v\bçU\v\b", '\0' <repeats 16 times>, "ä\004.·ü¸:·\000\000\000\000XõY·\000\000\000\b\000\000\000\000ð¸:·ø´:·¡ú-·\030\231Z·ÿÿÿÿø´:·9\000\000\000Ü´:·\000\000\000\000(\000\000\000Ô´:· \000\000\000 \221\v\b \000\000\0008\006:·\230\235\v\bXò+µ\034nX·À\231:·\000\000\000\000\000½\v\b\a\000\000\000Ô\005:·°\000\000\000À´\n\bÈò+µ\000\000\000\000\210}\v\b\221þ3·\003\000\000\000Èò+µ\234þ3·\001\000\000"... bufptr = <value optimized out> attr = <value optimized out> tag = <value optimized out> value_tag = <value optimized out> value = <value optimized out> #8 0xb759475d in ippRead (http=0xb75a9918, ipp=0x80bb9f8) at ipp.c:991 No locals. #9 0xb759e792 in cupsDoFileRequest (http=0x80b4db8, request=0x80bb738, resource=0x8075c50 "/", filename=0x0) at request.c:346 response = (ipp_t *) 0x80bb9f8 length = <value optimized out> status = HTTP_OK got_status = 0 state = IPP_DATA file = (FILE *) 0x0 fileinfo = {st_dev = 7371206394, __pad1 = 42104, __st_ino = 3039589160, st_mode = 3074974180, st_nlink = 127, st_uid = 3074974180, st_gid = 3039589240, st_rdev = 577991481722372527, __pad2 = 42104, st_size = -5391807557197055928, st_blksize = -1221723487, st_blocks = 0, st_atim = {tv_sec = 16, tv_nsec = 134980728}, st_mtim = {tv_sec = 1, tv_nsec = -1255378024}, st_ctim = {tv_sec = -1255378024, tv_nsec = -1219993116}, st_ino = 13199935153591287808} bytes = 3 buffer = '\0' <repeats 32444 times>, "Vç-·", '\0' <repeats 20 times>, "ä\004.·)\000\000\000ä´:·ä´:·\000\000\000\000ø´:·0", '\0' <repeats 11 times>, "ð¸:·ø´:·\000\000\000\000ô\237:·ä\004.·ø´:·9\000\000\000ä\004.·", '\0' <repeats 20 times>, "ð¸:·ø´:·\003\000\000\000ü¸:·ø·:·ø´:·\030\000\000\000Ì´:·ø´:·\001\b\000\000\030", '\0' <repeats 11 times>, "%*P·\bÁ[·\001\000\000\000\210r,µô\237:·À´:·aE\001\000¸r,µµ!.·ø´:·p¤\v\bX\000\000\000"... expect = HTTP_CONTINUE #10 0xb759ecf1 in cupsDoRequest (http=0x80b4db8, request=0x80bb738, resource=0x8075c50 "/") at request.c:451 No locals. #11 0xb75b54e8 in request_thread_main (request=0x80b3c90, unused=0x0) at gnome-cups-request.c:341 status = 3074077888 __PRETTY_FUNCTION__ = "request_thread_main" #12 0xb743fd27 in g_thread_pool_push () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #13 0xb743e36f in g_thread_create_full () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #14 0xb74ff267 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0 No symbol table info available. #15 0xb734745e in clone () from /lib/tls/i686/cmov/libc.so.6 No symbol table info available. Thread 1 (Thread -1228335424 (LWP 4222)): #0 0xb7f70410 in ?? () No symbol table info available. #1 0xbfd2d918 in ?? () No symbol table info available. #2 0x00001388 in ?? () No symbol table info available. #3 0x00000009 in ?? () No symbol table info available. #4 0xb733d4d3 in poll () from /lib/tls/i686/cmov/libc.so.6 No symbol table info available. #5 0xb7423859 in g_main_context_check () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #6 0xb7423be7 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #7 0xb7b65141 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0 No symbol table info available. #8 0x0804c021 in main (argc=3, argv=0xbfd2dae4) at gnome-cups-icon.c:136 No locals.