sb> It's Mule related. That doesn't seem to be the case. I now built several XEmacsen. My initial report came from one compiled with Mule, egcc. I then tried gcc without optimization, and without Mule, without union-type and so on, until I built the one below (and the core dump is still with me). sb> Hmm. Maybe I should try a Mule build without minimal tagbits. I'm building one of those now, too. [A few minutes later] Yes, the same configuration as below, but without minimal tagbits doesn't dump core. [A few minutes earlier again] BTW, when gdb gives me that: "find_solib: Can't read pathname for load map: Input/output error" should I worry? HTH, leo Here my latest build: uname -a: Linux elric 2.0.34 #4 Mon Jun 8 13:47:43 CEST 1998 i586 unknown ../xemacs-test/configure '--srcdir=/home/xemacs/xemacs-test' '--cflags=-g' '--debug' '--error-checking=all' '--use-union-type' '--without-x11' '--with-gpm=no' '--with-database=no' '--with-sound=no' XEmacs 21.0 "Benadir" configured for `i586-pc-linux'. Where should the build process find the source code? /home/xemacs/xemacs-test What installation prefix should install use? /usr/local What operating system and machine description files should XEmacs use? `s/linux.h' and `m/intel386.h' What compiler should XEmacs be built with? gcc -g Should XEmacs use the GNU version of malloc? yes (Using Doug Lea's new malloc from the GNU C Library.) Should XEmacs use the relocating allocator for buffers? yes What window system should XEmacs use? none Compiling in support for ncurses. Compiling in DLL support. movemail will use "dot-locking" for locking mail spool files. Using the union type for Lisp_Objects. Using Lisp_Objects with minimal tagbits. Compiling in extra code for debugging. Compiling in code for checking XEmacs memory usage. WARNING: --------------------------------------------------------- WARNING: Compiling in support for runtime error checking. WARNING: XEmacs will run noticeably more slowly as a result. WARNING: Error checking is on by default for XEmacs beta releases. WARNING: --------------------------------------------------------- $ ldd xemacs libdl.so.2 => /lib/libdl.so.2 (0x4000f000) libncurses.so.3.4 => /lib/libncurses.so.3.4 (0x40012000) libm.so.6 => /lib/libm.so.6 (0x40057000) libc.so.6 => /lib/libc.so.6 (0x40070000) /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000) Debian claims this is glibc 2.0.7pre3 and ncurses 1.9.9g. lrwxrwxrwx 1 root root 14 Jun 10 13:21 /lib/libdl.so.2 -> libdl-2.0.7.so -rw-r--r-- 1 root root 241972 May 25 16:22 /lib/libncurses.so.3.4 lrwxrwxrwx 1 root root 13 Jun 10 13:21 /lib/libm.so.6 -> libm-2.0.7.so lrwxrwxrwx 1 root root 13 Jun 10 13:21 /lib/libc.so.6 -> libc-2.0.7.so lrwxrwxrwx 1 root root 11 Jun 10 13:21 /lib/ld-linux.so.2 -> ld-2.0.7.so $ gcc --version 2.7.2.3 GNU gdb 4.17 Copyright 1998 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i586-pc-linux-gnu"... Core was generated by `/home/xemacs/test1/src/xemacs -vanilla'. Program terminated with signal 11, Segmentation fault. find_solib: Can't read pathname for load map: Input/output error #0 0x8141cbc in print_internal (obj={gu = {type = Lisp_Type_Record, val = 0}, s = {bits = 0, val = 0}, u = {bits = 0, val = 0}, ui = 0, i = 0, v = 0x0, cv = 0x0}, printcharfun={gu = {type = Lisp_Type_Record, val = 34290013}, s = {bits = 0, val = 68580026}, u = {bits = 0, val = 68580026}, ui = 137160052, i = 137160052, v = 0x82ce574, cv = 0x82ce574}, escapeflag=1) at /home/xemacs/xemacs-test/src/print.c:1061 1061 if (CONSP (obj) || VECTORP (obj) || COMPILED_FUNCTIONP (obj)) (gdb) bt #0 0x8141cbc in print_internal (obj={gu = {type = Lisp_Type_Record, val = 0}, s = {bits = 0, val = 0}, u = {bits = 0, val = 0}, ui = 0, i = 0, v = 0x0, cv = 0x0}, printcharfun={gu = {type = Lisp_Type_Record, val = 34290013}, s = {bits = 0, val = 68580026}, u = {bits = 0, val = 68580026}, ui = 137160052, i = 137160052, v = 0x82ce574, cv = 0x82ce574}, escapeflag=1) at /home/xemacs/xemacs-test/src/print.c:1061 #1 0x8140800 in Fprin1 (object={gu = {type = Lisp_Type_Record, val = 0}, s = { bits = 0, val = 0}, u = {bits = 0, val = 0}, ui = 0, i = 0, v = 0x0, cv = 0x0}, stream={gu = {type = Lisp_Type_Record, val = 34290013}, s = { bits = 0, val = 68580026}, u = {bits = 0, val = 68580026}, ui = 137160052, i = 137160052, v = 0x82ce574, cv = 0x82ce574}) at /home/xemacs/xemacs-test/src/print.c:506 #2 0x80bac0a in Fbacktrace (stream={gu = {type = Lisp_Type_Record, val = 34290013}, s = {bits = 0, val = 68580026}, u = {bits = 0, val = 68580026}, ui = 137160052, i = 137160052, v = 0x82ce574, cv = 0x82ce574}, detailed={gu = {type = Lisp_Type_Record, val = 34263224}, s = {bits = 0, val = 68526448}, u = {bits = 0, val = 68526448}, ui = 137052896, i = 137052896, v = 0x82b42e0, cv = 0x82b42e0}) at /home/xemacs/xemacs-test/src/eval.c:4936 #3 0x80ac606 in fatal_error_signal (sig=11) at /home/xemacs/xemacs-test/src/emacs.c:245 #4 0xbfffe490 in ?? () #5 0x814091d in Fprin1_to_string (object={gu = {type = Lisp_Type_Record, val = 0}, s = {bits = 0, val = 0}, u = {bits = 0, val = 0}, ui = 0, i = 0, v = 0x0, cv = 0x0}, noescape={gu = {type = Lisp_Type_Record, val = 34263217}, s = {bits = 0, val = 68526434}, u = {bits = 0, val = 68526434}, ui = 137052868, i = 137052868, v = 0x82b42c4, cv = 0x82b42c4}) at /home/xemacs/xemacs-test/src/print.c:531 #6 0x80b6591 in funcall_recording_as (recorded_as={gu = { type = Lisp_Type_Record, val = 34289971}, s = {bits = 0, val = 68579942}, u = {bits = 0, val = 68579942}, ui = 137159884, i = 137159884, v = 0x82ce4cc, cv = 0x82ce4cc}, nargs=1, args=0xbfffe708) at /home/xemacs/xemacs-test/src/eval.c:3193 #7 0x80b6c0b in Ffuncall (nargs=2, args=0xbfffe708) at /home/xemacs/xemacs-test/src/eval.c:3238 #8 0x8082307 in Fbyte_code (bytestr={gu = {type = Lisp_Type_Record, val = 34525993}, s = {bits = 0, val = 69051986}, u = {bits = 0, val = 69051986}, ui = 138103972, i = 138103972, v = 0x83b4ca4, cv = 0x83b4ca4}, vector={gu = {type = Lisp_Type_Record, val = 34517042}, s = {bits = 0, val = 69034084}, u = {bits = 0, val = 69034084}, ui = 138068168, i = 138068168, v = 0x83ac0c8, cv = 0x83ac0c8}, maxdepth={ gu = {type = Lisp_Type_Int_Even, val = 3}, s = {bits = 1, val = 6}, u = { bits = 1, val = 6}, ui = 13, i = 13, v = 0xd, cv = 0xd}) at /home/xemacs/xemacs-test/src/bytecode.c:416 #9 0x80b7d5b in funcall_lambda (fun={gu = {type = Lisp_Type_Record, val = 34522932}, s = {bits = 0, val = 69045864}, u = {bits = 0, val = 69045864}, ui = 138091728, i = 138091728, v = 0x83b1cd0, cv = 0x83b1cd0}, nargs=3, arg_vector=0xbfffead8) at /home/xemacs/xemacs-test/src/eval.c:3597 #10 0x80b6a5c in funcall_recording_as (recorded_as={gu = { type = Lisp_Type_Record, val = 34479367}, s = {bits = 0, val = 68958734}, u = {bits = 0, val = 68958734}, ui = 137917468, i = 137917468, v = 0x838741c, cv = 0x838741c}, nargs=3, args=0xbfffead4) at /home/xemacs/xemacs-test/src/eval.c:3200 #11 0x80b6c0b in Ffuncall (nargs=4, args=0xbfffead4) at /home/xemacs/xemacs-test/src/eval.c:3238 #12 0x8082307 in Fbyte_code (bytestr={gu = {type = Lisp_Type_Record, val = 34525731}, s = {bits = 0, val = 69051462}, u = {bits = 0, val = 69051462}, ui = 138102924, i = 138102924, v = 0x83b488c, cv = 0x83b488c}, vector={gu = {type = Lisp_Type_Record, val = 34516968}, s = {bits = 0, val = 69033936}, u = {bits = 0, val = 69033936}, ui = 138067872, i = 138067872, v = 0x83abfa0, cv = 0x83abfa0}, maxdepth={ gu = {type = Lisp_Type_Int_Even, val = 2}, s = {bits = 1, val = 4}, u = { bits = 1, val = 4}, ui = 9, i = 9, v = 0x9, cv = 0x9}) at /home/xemacs/xemacs-test/src/bytecode.c:416 #13 0x80b7d5b in funcall_lambda (fun={gu = {type = Lisp_Type_Record, val = 34522904}, s = {bits = 0, val = 69045808}, u = {bits = 0, val = 69045808}, ui = 138091616, i = 138091616, v = 0x83b1c60, cv = 0x83b1c60}, nargs=1, arg_vector=0xbfffedc8) at /home/xemacs/xemacs-test/src/eval.c:3597 #14 0x80b6a5c in funcall_recording_as (recorded_as={gu = { type = Lisp_Type_Record, val = 34522904}, s = {bits = 0, val = 69045808}, u = {bits = 0, val = 69045808}, ui = 138091616, i = 138091616, v = 0x83b1c60, cv = 0x83b1c60}, nargs=1, args=0xbfffedc4) at /home/xemacs/xemacs-test/src/eval.c:3200 #15 0x80b6c0b in Ffuncall (nargs=2, args=0xbfffedc4) at /home/xemacs/xemacs-test/src/eval.c:3238 #16 0x80b85aa in call1 (fn={gu = {type = Lisp_Type_Record, val = 34522904}, s = {bits = 0, val = 69045808}, u = {bits = 0, val = 69045808}, ui = 138091616, i = 138091616, v = 0x83b1c60, cv = 0x83b1c60}, arg0={ gu = {type = Lisp_Type_Record, val = 34294427}, s = {bits = 0, val = 68588854}, u = {bits = 0, val = 68588854}, ui = 137177708, i = 137177708, v = 0x82d2a6c, cv = 0x82d2a6c}) at /home/xemacs/xemacs-test/src/eval.c:3921 #17 0x81842b9 in mapatoms_1 (sym={gu = {type = Lisp_Type_Record, val = 34294427}, s = {bits = 0, val = 68588854}, u = {bits = 0, val = 68588854}, ui = 137177708, i = 137177708, v = 0x82d2a6c, cv = 0x82d2a6c}, arg=0xbfffee34) at /home/xemacs/xemacs-test/src/symbols.c:408 #18 0x81841ad in map_obarray (obarray={gu = {type = Lisp_Type_Record, val = 34263730}, s = {bits = 0, val = 68527460}, u = {bits = 0, val = 68527460}, ui = 137054920, i = 137054920, v = 0x82b4ac8, cv = 0x82b4ac8}, fn=0x81842a0 <mapatoms_1>, arg=0xbfffee34) at /home/xemacs/xemacs-test/src/symbols.c:395 #19 0x818430c in Fmapatoms (function={gu = {type = Lisp_Type_Record, val = 34522904}, s = {bits = 0, val = 69045808}, u = {bits = 0, val = 69045808}, ui = 138091616, i = 138091616, v = 0x83b1c60, cv = 0x83b1c60}, obarray={gu = {type = Lisp_Type_Record, val = 34263730}, s = {bits = 0, val = 68527460}, u = {bits = 0, val = 68527460}, ui = 137054920, i = 137054920, v = 0x82b4ac8, cv = 0x82b4ac8}) at /home/xemacs/xemacs-test/src/symbols.c:422 #20 0x80b6591 in funcall_recording_as (recorded_as={gu = { type = Lisp_Type_Record, val = 34291868}, s = {bits = 0, val = 68583736}, u = {bits = 0, val = 68583736}, ui = 137167472, i = 137167472, v = 0x82d0270, cv = 0x82d0270}, nargs=1, args=0xbfffef38) at /home/xemacs/xemacs-test/src/eval.c:3193 #21 0x80b6c0b in Ffuncall (nargs=2, args=0xbfffef38) at /home/xemacs/xemacs-test/src/eval.c:3238 #22 0x8082307 in Fbyte_code (bytestr={gu = {type = Lisp_Type_Record, val = 34525691}, s = {bits = 0, val = 69051382}, u = {bits = 0, val = 69051382}, ui = 138102764, i = 138102764, v = 0x83b47ec, cv = 0x83b47ec}, vector={gu = {type = Lisp_Type_Record, val = 34516990}, s = {bits = 0, val = 69033980}, u = {bits = 0, val = 69033980}, ui = 138067960, i = 138067960, v = 0x83abff8, cv = 0x83abff8}, maxdepth={ gu = {type = Lisp_Type_Int_Even, val = 2}, s = {bits = 1, val = 4}, u = { bits = 1, val = 4}, ui = 9, i = 9, v = 0x9, cv = 0x9}) at /home/xemacs/xemacs-test/src/bytecode.c:416 #23 0x80b7d5b in funcall_lambda (fun={gu = {type = Lisp_Type_Record, val = 34522911}, s = {bits = 0, val = 69045822}, u = {bits = 0, val = 69045822}, ui = 138091644, i = 138091644, v = 0x83b1c7c, cv = 0x83b1c7c}, nargs=2, arg_vector=0xbffff224) at /home/xemacs/xemacs-test/src/eval.c:3597 #24 0x80b6a5c in funcall_recording_as (recorded_as={gu = { type = Lisp_Type_Record, val = 34442856}, s = {bits = 0, val = 68885712}, u = {bits = 0, val = 68885712}, ui = 137771424, i = 137771424, v = 0x83639a0, cv = 0x83639a0}, nargs=2, args=0xbffff220) at /home/xemacs/xemacs-test/src/eval.c:3200 #25 0x80b6c0b in Ffuncall (nargs=3, args=0xbffff220) at /home/xemacs/xemacs-test/src/eval.c:3238 #26 0x80884ce in Fcall_interactively (function={gu = {type = Lisp_Type_Record, val = 34442856}, s = {bits = 0, val = 68885712}, u = {bits = 0, val = 68885712}, ui = 137771424, i = 137771424, v = 0x83639a0, cv = 0x83639a0}, record_flag={gu = {type = Lisp_Type_Record, val = 34263224}, s = {bits = 0, val = 68526448}, u = {bits = 0, val = 68526448}, ui = 137052896, i = 137052896, v = 0x82b42e0, cv = 0x82b42e0}, keys={gu = {type = Lisp_Type_Record, val = 34263217}, s = {bits = 0, val = 68526434}, u = {bits = 0, val = 68526434}, ui = 137052868, i = 137052868, v = 0x82b42c4, cv = 0x82b42c4}) at /home/xemacs/xemacs-test/src/callint.c:935 #27 0x80b4875 in Fcommand_execute (cmd={gu = {type = Lisp_Type_Record, val = 34442856}, s = {bits = 0, val = 68885712}, u = {bits = 0, val = 68885712}, ui = 137771424, i = 137771424, v = 0x83639a0, cv = 0x83639a0}, record={gu = {type = Lisp_Type_Record, val = 34263224}, s = {bits = 0, val = 68526448}, u = {bits = 0, val = 68526448}, ui = 137052896, i = 137052896, v = 0x82b42e0, cv = 0x82b42e0}, keys={ gu = {type = Lisp_Type_Record, val = 34263217}, s = {bits = 0, val = 68526434}, u = {bits = 0, val = 68526434}, ui = 137052868, i = 137052868, v = 0x82b42c4, cv = 0x82b42c4}) at /home/xemacs/xemacs-test/src/eval.c:2584 #28 0x80b65b5 in funcall_recording_as (recorded_as={gu = { type = Lisp_Type_Record, val = 34284237}, s = {bits = 0, val = 68568474}, u = {bits = 0, val = 68568474}, ui = 137136948, i = 137136948, v = 0x82c8b34, cv = 0x82c8b34}, nargs=2, args=0xbffff5e8) at /home/xemacs/xemacs-test/src/eval.c:3193 #29 0x80b6c0b in Ffuncall (nargs=3, args=0xbffff5e8) at /home/xemacs/xemacs-test/src/eval.c:3238 #30 0x8082307 in Fbyte_code (bytestr={gu = {type = Lisp_Type_Record, val = 34103063}, s = {bits = 0, val = 68206126}, u = {bits = 0, val = 68206126}, ui = 136412252, i = 136412252, v = 0x8217c5c, cv = 0x8217c5c}, vector={gu = {type = Lisp_Type_Record, val = 34103103}, s = {bits = 0, val = 68206206}, u = {bits = 0, val = 68206206}, ui = 136412412, i = 136412412, v = 0x8217cfc, cv = 0x8217cfc}, maxdepth={ gu = {type = Lisp_Type_Int_Even, val = 4}, s = {bits = 1, val = 8}, u = { bits = 1, val = 8}, ui = 17, i = 17, v = 0x11, cv = 0x11}) at /home/xemacs/xemacs-test/src/bytecode.c:416 #31 0x80b7d5b in funcall_lambda (fun={gu = {type = Lisp_Type_Record, val = 34103184}, s = {bits = 0, val = 68206368}, u = {bits = 0, val = 68206368}, ui = 136412736, i = 136412736, v = 0x8217e40, cv = 0x8217e40}, nargs=1, arg_vector=0xbffff8e4) at /home/xemacs/xemacs-test/src/eval.c:3597 #32 0x80b6a5c in funcall_recording_as (recorded_as={gu = { type = Lisp_Type_Record, val = 34348835}, s = {bits = 0, val = 68697670}, u = {bits = 0, val = 68697670}, ui = 137395340, i = 137395340, v = 0x8307c8c, cv = 0x8307c8c}, nargs=1, args=0xbffff8e0) at /home/xemacs/xemacs-test/src/eval.c:3200 #33 0x80b6c0b in Ffuncall (nargs=2, args=0xbffff8e0) at /home/xemacs/xemacs-test/src/eval.c:3238 #34 0x80884ce in Fcall_interactively (function={gu = {type = Lisp_Type_Record, val = 34348835}, s = {bits = 0, val = 68697670}, u = {bits = 0, val = 68697670}, ui = 137395340, i = 137395340, v = 0x8307c8c, cv = 0x8307c8c}, record_flag={gu = {type = Lisp_Type_Record, val = 34263217}, s = {bits = 0, val = 68526434}, u = {bits = 0, val = 68526434}, ui = 137052868, i = 137052868, v = 0x82b42c4, cv = 0x82b42c4}, keys={gu = {type = Lisp_Type_Record, val = 34263217}, s = {bits = 0, val = 68526434}, u = {bits = 0, val = 68526434}, ui = 137052868, i = 137052868, v = 0x82b42c4, cv = 0x82b42c4}) at /home/xemacs/xemacs-test/src/callint.c:935 #35 0x80b4875 in Fcommand_execute (cmd={gu = {type = Lisp_Type_Record, val = 34348835}, s = {bits = 0, val = 68697670}, u = {bits = 0, val = 68697670}, ui = 137395340, i = 137395340, v = 0x8307c8c, cv = 0x8307c8c}, record={gu = {type = Lisp_Type_Record, val = 34263217}, s = {bits = 0, val = 68526434}, u = {bits = 0, val = 68526434}, ui = 137052868, i = 137052868, v = 0x82b42c4, cv = 0x82b42c4}, keys={ gu = {type = Lisp_Type_Record, val = 34263217}, s = {bits = 0, val = 68526434}, u = {bits = 0, val = 68526434}, ui = 137052868, i = 137052868, v = 0x82b42c4, cv = 0x82b42c4}) at /home/xemacs/xemacs-test/src/eval.c:2584 #36 0x80d918e in execute_command_event (command_builder=0x836ac18, event={ gu = {type = Lisp_Type_Record, val = 34481779}, s = {bits = 0, val = 68963558}, u = {bits = 0, val = 68963558}, ui = 137927116, i = 137927116, v = 0x83899cc, cv = 0x83899cc}) at /home/xemacs/xemacs-test/src/event-stream.c:4346 #37 0x80d992d in Fdispatch_event (event={gu = {type = Lisp_Type_Record, val = 34481757}, s = {bits = 0, val = 68963514}, u = {bits = 0, val = 68963514}, ui = 137927028, i = 137927028, v = 0x8389974, cv = 0x8389974}) at /home/xemacs/xemacs-test/src/event-stream.c:4637 #38 0x808e503 in Fcommand_loop_1 () at /home/xemacs/xemacs-test/src/cmdloop.c:579 #39 0x808e266 in command_loop_1 (dummy={gu = {type = Lisp_Type_Record, val = 34263217}, s = {bits = 0, val = 68526434}, u = {bits = 0, val = 68526434}, ui = 137052868, i = 137052868, v = 0x82b42c4, cv = 0x82b42c4}) at /home/xemacs/xemacs-test/src/cmdloop.c:494 #40 0x80b2ba5 in condition_case_1 (handlers={gu = {type = Lisp_Type_Record, val = 34263245}, s = {bits = 0, val = 68526490}, u = {bits = 0, val = 68526490}, ui = 137052980, i = 137052980, v = 0x82b4334, cv = 0x82b4334}, bfun=0x808e240 <command_loop_1>, barg={gu = { type = Lisp_Type_Record, val = 34263217}, s = {bits = 0, val = 68526434}, u = {bits = 0, val = 68526434}, ui = 137052868, i = 137052868, v = 0x82b42c4, cv = 0x82b42c4}, hfun=0x808d960 <cmd_error>, harg={gu = {type = Lisp_Type_Record, val = 34263217}, s = {bits = 0, val = 68526434}, u = {bits = 0, val = 68526434}, ui = 137052868, i = 137052868, v = 0x82b42c4, cv = 0x82b42c4}) at /home/xemacs/xemacs-test/src/eval.c:1653 #41 0x808daaf in command_loop_3 () at /home/xemacs/xemacs-test/src/cmdloop.c:256 #42 0x808daec in command_loop_2 (dummy={gu = {type = Lisp_Type_Record, val = 34263217}, s = {bits = 0, val = 68526434}, u = {bits = 0, val = 68526434}, ui = 137052868, i = 137052868, v = 0x82b42c4, cv = 0x82b42c4}) at /home/xemacs/xemacs-test/src/cmdloop.c:267 #43 0x80b2690 in internal_catch (tag={gu = {type = Lisp_Type_Record, val = 34281796}, s = {bits = 0, val = 68563592}, u = {bits = 0, val = 68563592}, ui = 137127184, i = 137127184, v = 0x82c6510, cv = 0x82c6510}, func=0x808dae0 <command_loop_2>, arg={gu = { type = Lisp_Type_Record, val = 34263217}, s = {bits = 0, val = 68526434}, u = {bits = 0, val = 68526434}, ui = 137052868, i = 137052868, v = 0x82b42c4, cv = 0x82b42c4}, threw=0x0) at /home/xemacs/xemacs-test/src/eval.c:1328 #44 0x808dd6e in initial_command_loop (load_me={gu = {type = Lisp_Type_Record, val = 34263217}, s = {bits = 0, val = 68526434}, u = {bits = 0, val = 68526434}, ui = 137052868, i = 137052868, v = 0x82b42c4, cv = 0x82b42c4}) at /home/xemacs/xemacs-test/src/cmdloop.c:305 #45 0x80ad708 in xemacs_21_0_i586_pc_linux (argc=2, argv=0xbffffdbc, envp=0xbffffdc8, restart=0) at /home/xemacs/xemacs-test/src/emacs.c:1702 #46 0x80ae3e0 in main (argc=2, argv=0xbffffdbc, envp=0xbffffdc8) at /home/xemacs/xemacs-test/src/emacs.c:2119 (gdb)