Comment # 16 on bug 948804 from Bernhard Wiedemann

maybe start with the backtrace of where the segfault happened
and check where this did not go as expected

> gdb /usr/bin/gdb gdb.core
(gdb) bt
#0  0x00007f3dfade07a8 in __GI_raise (sig=sig@entry=6) at
../sysdeps/unix/sysv/linux/raise.c:55
#1  0x00007f3dfade1bfa in __GI_abort () at abort.c:78
#2  0x00007f3dfba44a23 in pre_init_throw (k=0x1b661a0, args=0x1c43ec0) at
throw.c:520
#3  0x00007f3dfba5eac7 in vm_regular_engine (vm=0xfa0, program=0xfa0,
argv=0x1bb6158, nargs=-73119408) at vm-i-system.c:858
#4  0x00007f3dfba5f1f8 in scm_call_with_vm (vm=0x1bb3070, proc=0x1bb0720,
args=<optimized out>) at vm.c:1060
#5  0x00007f3dfb9cc781 in scm_apply (proc=<optimized out>, arg1=<optimized
out>, args=<optimized out>, args@entry=0x304) at eval.c:755
#6  0x00007f3dfb9ce400 in scm_apply_1 (proc=<optimized out>,
arg1=arg1@entry=0x1b661a0, args=<optimized out>) at eval.c:588
#7  0x00007f3dfba4473c in scm_throw (key=key@entry=0x1b661a0, args=<optimized
out>) at throw.c:98
#8  0x00007f3dfba44b45 in scm_ithrow (key=key@entry=0x1b661a0, args=<optimized
out>, no_return=no_return@entry=1) at throw.c:435
#9  0x00007f3dfb9cb335 in scm_error_scm (key=key@entry=0x1b661a0,
subr=<optimized out>, message=message@entry=0x1c3d100,
args=args@entry=0x1c43f50, data=data@entry=0x4) at error.c:94
#10 0x00007f3dfb9cb3ef in scm_error (key=0x1b661a0,
subr=subr@entry=0x7f3dfba849db "open_iconv_descriptors",
message=message@entry=0x7f3dfba85770 "invalid or unknown character encoding
~s", args=0x1c43f50, rest=rest@entry=0x4) at error.c:59
#11 0x00007f3dfb9cb812 in scm_misc_error (subr=subr@entry=0x7f3dfba849db
"open_iconv_descriptors", message=message@entry=0x7f3dfba85770 "invalid or
unknown character encoding ~s", args=<optimized out>) at error.c:304
#12 0x00007f3dfba106bc in open_iconv_descriptors (writing=<optimized out>,
reading=<optimized out>, encoding=<optimized out>) at ports.c:2501
#13 scm_i_port_iconv_descriptors (port=port@entry=0x1c38ff0,
mode=mode@entry=SCM_PORT_WRITE) at ports.c:2547
#14 0x00007f3dfba130ff in display_string_using_iconv
(str=str@entry=0x7f3dfba777b0 <scm_misc_error_key_string_stringbuf+16>,
narrow_p=narrow_p@entry=1, len=len@entry=10, port=port@entry=0x1c38ff0,
strategy=strategy@entry=SCM_FAILED_CONVERSION_QUESTION_MARK) at print.c:950
#15 0x00007f3dfba133c7 in display_string (str=0x7f3dfba777b0
<scm_misc_error_key_string_stringbuf+16>, narrow_p=narrow_p@entry=1,
len=len@entry=10, port=port@entry=0x1c38ff0,
strategy=strategy@entry=SCM_FAILED_CONVERSION_QUESTION_MARK) at print.c:1071
#16 0x00007f3dfba1506f in iprin1 (exp=0x1c3d140, port=0x1c38ff0,
pstate=<optimized out>) at print.c:654
#17 0x00007f3dfba14309 in scm_prin1 (exp=exp@entry=0x1c3d140,
port=port@entry=0x1c38ff0, writingp=writingp@entry=0) at print.c:845
#18 0x00007f3dfba13a9e in scm_display (obj=0x1c3d140,
port=port@entry=0x1c38ff0) at print.c:1443
#19 0x00007f3dfba14113 in print_normal_symbol (port=0x1c38ff0, sym=0x1b661a0)
at print.c:400
#20 scm_i_print_symbol_name (sym=0x1b661a0, port=0x1c38ff0) at print.c:495
#21 0x00007f3dfba15240 in iprin1 (exp=0x1b661a0, port=0x1c38ff0,
pstate=0x1b606a0) at print.c:669
#22 0x00007f3dfba14309 in scm_prin1 (exp=exp@entry=0x1b661a0,
port=port@entry=0x1c38ff0, writingp=writingp@entry=1) at print.c:845
#23 0x00007f3dfba15461 in scm_write (obj=obj@entry=0x1b661a0, port=0x1c38ff0)
at print.c:1428
#24 0x00007f3dfba44a63 in pre_init_throw (k=0x1b661a0, args=0x1c43f80) at
throw.c:507
#25 0x00007f3dfba5eac7 in vm_regular_engine (vm=0xfa0, program=0xfa0,
argv=0x1bb6108, nargs=-73119408) at vm-i-system.c:858
#26 0x00007f3dfba5f1f8 in scm_call_with_vm (vm=0x1bb3070, proc=0x1bb0720,
args=<optimized out>) at vm.c:1060
#27 0x00007f3dfb9cc781 in scm_apply (proc=<optimized out>, arg1=<optimized
out>, args=<optimized out>, args@entry=0x304) at eval.c:755
#28 0x00007f3dfb9ce400 in scm_apply_1 (proc=<optimized out>,
arg1=arg1@entry=0x1b661a0, args=<optimized out>) at eval.c:588
#29 0x00007f3dfba4473c in scm_throw (key=key@entry=0x1b661a0, args=<optimized
out>) at throw.c:98
#30 0x00007f3dfba44b45 in scm_ithrow (key=key@entry=0x1b661a0, args=<optimized
out>, no_return=no_return@entry=1) at throw.c:435
#31 0x00007f3dfb9cb335 in scm_error_scm (key=key@entry=0x1b661a0,
subr=<optimized out>, message=message@entry=0x1c3d1a0,
args=args@entry=0x1c40010, data=data@entry=0x4) at error.c:94
#32 0x00007f3dfb9cb3ef in scm_error (key=0x1b661a0,
subr=subr@entry=0x7f3dfba849db "open_iconv_descriptors",
message=message@entry=0x7f3dfba85770 "invalid or unknown character encoding
~s", args=0x1c40010, rest=rest@entry=0x4) at error.c:59
#33 0x00007f3dfb9cb812 in scm_misc_error (subr=subr@entry=0x7f3dfba849db
"open_iconv_descriptors", message=message@entry=0x7f3dfba85770 "invalid or
unknown character encoding ~s", args=<optimized out>) at error.c:304
#34 0x00007f3dfba106bc in open_iconv_descriptors (writing=<optimized out>,
reading=<optimized out>, encoding=<optimized out>) at ports.c:2501
#35 scm_i_port_iconv_descriptors (port=port@entry=0x1c38ff0,
mode=mode@entry=SCM_PORT_WRITE) at ports.c:2547
#36 0x00007f3dfba130ff in display_string_using_iconv
(str=str@entry=0x7f3dfba8d810 <scm_encoding_error_key_string_stringbuf+16>,
narrow_p=narrow_p@entry=1, len=len@entry=14, port=port@entry=0x1c38ff0,
strategy=strategy@entry=SCM_FAILED_CONVERSION_QUESTION_MARK) at print.c:950
#37 0x00007f3dfba133c7 in display_string (str=0x7f3dfba8d810
<scm_encoding_error_key_string_stringbuf+16>, narrow_p=narrow_p@entry=1,
len=len@entry=14, port=port@entry=0x1c38ff0,
strategy=strategy@entry=SCM_FAILED_CONVERSION_QUESTION_MARK) at print.c:1071
#38 0x00007f3dfba1506f in iprin1 (exp=0x1c3d1e0, port=0x1c38ff0,
pstate=<optimized out>) at print.c:654
#39 0x00007f3dfba14309 in scm_prin1 (exp=exp@entry=0x1c3d1e0,
port=port@entry=0x1c38ff0, writingp=writingp@entry=0) at print.c:845
#40 0x00007f3dfba13a9e in scm_display (obj=0x1c3d1e0,
port=port@entry=0x1c38ff0) at print.c:1443
#41 0x00007f3dfba14113 in print_normal_symbol (port=0x1c38ff0, sym=0x1b4b460)
at print.c:400
#42 scm_i_print_symbol_name (sym=0x1b4b460, port=0x1c38ff0) at print.c:495
#43 0x00007f3dfba15240 in iprin1 (exp=0x1b4b460, port=0x1c38ff0,
pstate=0x1b60780) at print.c:669
#44 0x00007f3dfba14309 in scm_prin1 (exp=exp@entry=0x1b4b460,
port=port@entry=0x1c38ff0, writingp=writingp@entry=1) at print.c:845
#45 0x00007f3dfba15461 in scm_write (obj=obj@entry=0x1b4b460,
port=port@entry=0x1c38ff0) at print.c:1428
#46 0x00007f3dfb9b9951 in boot_print_exception (port=0x1c38ff0,
frame=<optimized out>, key=0x1b4b460, args=0x1c400b0) at backtrace.c:62
#47 0x00007f3dfba5ecbb in vm_regular_engine (vm=0xfa0, program=0xfa0,
argv=0x1bb60b8, nargs=-73688816) at vm-i-system.c:864
#48 0x00007f3dfb9ce073 in scm_call_4 (proc=0x1b69640, arg1=<optimized out>,
arg2=<optimized out>, arg3=arg3@entry=0x1b4b460, arg4=arg4@entry=0x1c400b0) at
eval.c:507
#49 0x00007f3dfb9ba52b in scm_print_exception (port=<optimized out>,
frame=<optimized out>, key=key@entry=0x1b4b460, args=args@entry=0x1c400b0) at
backtrace.c:92
#50 0x00007f3dfba44595 in handler_message (tag=tag@entry=0x1b4b460,
args=args@entry=0x1c400b0, handler_data=<optimized out>) at throw.c:368
#51 0x00007f3dfba44927 in scm_handle_by_message_noexit (handler_data=<optimized
out>, tag=0x1b4b460, args=0x1c400b0) at throw.c:419
#52 0x00007f3dfba44a04 in pre_init_throw (k=0x1b4b460, args=0x1c400b0) at
throw.c:516
#53 0x00007f3dfba5eac7 in vm_regular_engine (vm=0xfa0, program=0xfa0,
argv=0x1bb6058, nargs=-73119408) at vm-i-system.c:858
#54 0x00007f3dfba5f1f8 in scm_call_with_vm (vm=0x1bb3070, proc=0x1bb0720,
args=<optimized out>) at vm.c:1060
#55 0x00007f3dfb9cc781 in scm_apply (proc=<optimized out>, arg1=<optimized
out>, args=<optimized out>, args@entry=0x304) at eval.c:755
#56 0x00007f3dfb9ce400 in scm_apply_1 (proc=<optimized out>, arg1=<optimized
out>, args=<optimized out>) at eval.c:588
#57 0x00007f3dfba4473c in scm_throw (key=<optimized out>, args=<optimized out>)
at throw.c:98
#58 0x00007f3dfba3b3fc in scm_encoding_error (subr=subr@entry=0x7f3dfba8d620
<__func__.17343> "scm_to_stringn", err=<optimized out>,
message=message@entry=0x7f3dfba8d488 "cannot convert narrow string to output
locale", port=port@entry=0x4, chr=0x1c3d2a0, chr@entry=0x4) at strings.c:1486
#59 0x00007f3dfba3be8d in scm_to_stringn (str=str@entry=0x1c3d2a0,
lenp=lenp@entry=0x0, encoding=<optimized out>,
handler=SCM_FAILED_CONVERSION_QUESTION_MARK) at strings.c:2106
#60 0x00007f3dfba3c11c in scm_to_locale_stringn (str=str@entry=0x1c3d2a0,
lenp=lenp@entry=0x0) at strings.c:1820
#61 0x00007f3dfba3c127 in scm_to_locale_string (str=str@entry=0x1c3d2a0) at
strings.c:1814
#62 0x00007f3dfb9f12ad in search_path (path=0x1c401a0, filename=0x1c3d2a0,
extensions=extensions@entry=0x304, require_exts=require_exts@entry=0x4,
stat_buf=stat_buf@entry=0x7ffe0efc3940) at load.c:534
#63 0x00007f3dfb9f2014 in scm_init_eval_in_scheme () at load.c:1059
#64 0x00007f3dfb9eb3fb in scm_i_init_guile (base=base@entry=0x7ffe0efc3af0) at
init.c:502
#65 0x00007f3dfba41f50 in scm_i_init_thread_for_guile (base=0x7ffe0efc3af0,
parent=0x0) at threads.c:833
#66 0x00007f3dfba41f89 in with_guile_and_parent (base=0x7ffe0efc3af0,
data=0x7ffe0efc3b20) at threads.c:899
#67 0x00007f3dfaa60992 in GC_call_with_stack_base () from /usr/lib64/libgc.so.1
#68 0x00007f3dfba423a8 in scm_i_with_guile_and_parent (parent=<optimized out>,
data=data@entry=0x0, func=func@entry=0x589490 <call_initialize_gdb_module>) at
threads.c:949
#69 scm_with_guile (func=func@entry=0x589490 <call_initialize_gdb_module>,
data=data@entry=0x0) at threads.c:955
#70 0x0000000000589ee3 in _initialize_guile () at ../../gdb/guile/guile.c:860
#71 0x0000000000747ddd in initialize_all_files () at init.c:338
#72 0x000000000070e6a9 in gdb_init (argv0=0x17ad600 "gdb") at
../../gdb/top.c:1944
#73 0x0000000000643389 in captured_main (data=data@entry=0x7ffe0efc3de0) at
../../gdb/main.c:891
#74 0x00000000006400d5 in catch_errors (func=func@entry=0x6430d0
<captured_main>, func_args=func_args@entry=0x7ffe0efc3de0,
errstring=errstring@entry=0x8aa40f "", mask=mask@entry=RETURN_MASK_ALL) at
../../gdb/exceptions.c:237
#75 0x000000000064443b in gdb_main (args=args@entry=0x7ffe0efc3de0) at
../../gdb/main.c:1252
#76 0x00000000004719b5 in main (argc=<optimized out>, argv=<optimized out>) at
../../gdb/gdb.c:32