To reproduce, start Gnumeric and choose Data->Text to Columns....  Gnumeric crashes with a bus error.  The crash occurs both with an empty document and with a non-empty document.

System info:

Mac G5 (PowerPC), OS X 10.4.7
Gnumeric 1.7.0
GOffice 0.3.0
libgsf 1.14.1
Other packages (Glib 2.0, ...) from Fink
Built with SHEET_MAX_ROWS = 1048576 and SHEET_MAX_COLS = 1024.

$ uname -a
Darwin macjr.ccri.com 8.7.0 Darwin Kernel Version 8.7.0: Fri May 26 15:20:53 PDT 2006; root:xnu-792.6.76.obj~1/RELEASE_PPC Power Macintosh powerpc


GDB transcripts:

Here is a GDB transcript showing a stack dump.  Below that is a GDB transcript that seems to show strange mangling of the 'data' argument to stf_parse_options_guess() -- but I haven't used GDB much on this Mac and don't trust or know how to interpret this.

(gdb) run
Starting program: /Users/cdc6d/local/bin/gnumeric 
Reading symbols for shared libraries ......+++.+++++...........................................+++++++++++++
+ done
Reading symbols for shared libraries . done
Reading symbols for shared libraries .. done
Reading symbols for shared libraries . done

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00000000
0x90003164 in strchr ()
(gdb) where

+ Trace 72537

------------------------------------------------
GDB session showing 'data' mangling follows...
------------------------------------------------

(gdb) break stf_parse_options_guess
Breakpoint 1 at 0x9ff1c: file stf-parse.c, line 1375.
(gdb) run
Starting program: /Users/cdc6d/local/bin/gnumeric 
Reading symbols for shared libraries ......+++.+++++...........................................++++++++++++++ done
Breakpoint 1 at 0x10a7f1c: file stf-parse.c, line 1375.
Reading symbols for shared libraries . done
Reading symbols for shared libraries .. done
Reading symbols for shared libraries . done

Breakpoint 1, stf_parse_options_guess (data=0x264dc80 "\n") at stf-parse.c:1375
1375            gunichar sepchar = format_get_arg_sep ();
(gdb) l
1370            StfParseOptions_t *res;
1371            GStringChunk *lines_chunk;
1372            GPtrArray *lines;
1373            int tabcount;
1374            int sepcount;
1375            gunichar sepchar = format_get_arg_sep ();
1376
1377            g_return_val_if_fail (data != NULL, NULL);
1378
1379            res = stf_parse_options_new ();
(gdb) print data
$1 = 0x264dc80 "\n"
(gdb) unt 1383
stf_parse_options_guess (data=0x264dc80 "\n") at stf-parse.c:1383
1383            tabcount = count_character (lines, '\t', 0.2);
(gdb) print data
$2 = 0x264dc80 "\n"
(gdb) unt 1384
stf_parse_options_guess (data=0x264dc80 "\n") at stf-parse.c:1384
1384            sepcount = count_character (lines, sepchar, 0.2);
(gdb) print data
$3 = 0x264dc80 "\n"
(gdb) l
1379            res = stf_parse_options_new ();
1380            lines_chunk = g_string_chunk_new (100 * 1024);
1381            lines = stf_parse_lines (res, lines_chunk, data, SHEET_MAX_ROWS, FALSE);
1382
1383            tabcount = count_character (lines, '\t', 0.2);
1384            sepcount = count_character (lines, sepchar, 0.2);
1385
1386            /* At least one tab per line and enough to separate every
1387               would-be sepchars.  */
1388            if (tabcount >= 1 && tabcount >= sepcount - 1)
(gdb) unt 1388
stf_parse_options_guess (data=0x0) at stf-parse.c:1388
1388            if (tabcount >= 1 && tabcount >= sepcount - 1)
(gdb) print data
$4 = 0x0
(gdb) unt 1421
stf_parse_options_guess (data=0x2c <Address 0x2c out of bounds>) at stf-parse.c:1421
1421                    stf_parse_options_csv_set_duplicates
(gdb) print data
$5 = 0x2c <Address 0x2c out of bounds>
(gdb) l
1416                    /* Separated */
1417
1418                    stf_parse_options_set_type (res, PARSE_TYPE_CSV);
1419                    stf_parse_options_set_trim_spaces (res, TRIM_TYPE_LEFT | TRIM_TYPE_RIGHT);
1420                    stf_parse_options_csv_set_indicator_2x_is_single (res, TRUE);
1421                    stf_parse_options_csv_set_duplicates
1422                            (res, strchr (res->sep.chr, ' ') != NULL);
1423                    stf_parse_options_csv_set_trim_seps
1424                            (res, strchr (res->sep.chr, ' ') != NULL);
1425
(gdb) unt 1423

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00000000
0x90003164 in strchr ()
(gdb)