[Bug backtrace/31560] Segfault when computing backtrace

["wingo at igalia dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31560

--- Comment #1 from Andy Wingo <wingo at igalia dot com> ---
(gdb) disassemble
Dump of assembler code for function _ZNK5block5scopeEv:
=> 0x00000000004c3350 <+0>:     mov    0x28(%rdi),%rax
   0x00000000004c3354 <+4>:     test   %rax,%rax
   0x00000000004c3357 <+7>:     je     0x4c3361 <_ZNK5block5scopeEv+17>
   0x00000000004c3359 <+9>:     mov    (%rax),%rax
   0x00000000004c335c <+12>:    test   %rax,%rax
   0x00000000004c335f <+15>:    jne    0x4c336f <_ZNK5block5scopeEv+31>
   0x00000000004c3361 <+17>:    mov    0x18(%rdi),%rdi
   0x00000000004c3365 <+21>:    test   %rdi,%rdi
   0x00000000004c3368 <+24>:    jne    0x4c3350 <_ZNK5block5scopeEv>
   0x00000000004c336a <+26>:    mov    $0xacd413,%eax
   0x00000000004c336f <+31>:    ret


And a bt full:

#0  block::scope (this=<optimized out>) at ../../gdb-14.1/gdb/block.c:293
        block = <optimized out>
#1  0x000000000055b6b7 in cp_lookup_transparent_type (name=0x85e4b00
"v8::internal::ExternalPointerTable::Space") at
../../gdb-14.1/gdb/cp-namespace.c:1029
        t = 0x0
        scope = <optimized out>
#2  0x0000000000627b1d in check_typedef (type=<optimized out>,
type@entry=0x76f7780) at ../../gdb-14.1/gdb/gdbtypes.c:3052
        name = <optimized out>
        newtype = <optimized out>
        orig_type = 0x76f7780
        __func__ = "check_typedef"
        instance_flags = {m_enum_value = 0}
#3  0x00000000005134dc in c_value_print_ptr (options=0x7fffffffda30, recurse=2,
stream=0x7fffffffdb10, val=0xf0ce9e0) at ../../gdb-14.1/gdb/c-valprint.c:352
        unresolved_elttype = 0x76f7780
        elttype = <optimized out>
        addr = <optimized out>
        type = 0x76f7820
        valaddr = 0x2a6a760 "\b`\370\222BV"
        type = <optimized out>
        valaddr = <optimized out>
        addr = <optimized out>
        unresolved_elttype = <optimized out>
        elttype = <optimized out>
        addr = <optimized out>
#4  c_value_print_inner (val=0xf0ce9e0, stream=0x7fffffffdb10, recurse=2,
options=0x7fffffffda30) at ../../gdb-14.1/gdb/c-valprint.c:435
        type = <optimized out>
#5  0x00000000008941bb in common_val_print (value=0xf0ce9e0,
stream=0x7fffffffdb10, recurse=2, options=0x7fffffffdae0, language=0xd73150
<cplus_language_defn>) at ../../gdb-14.1/gdb/valprint.c:1092
        local_opts = {prettyformat = Val_no_prettyformat, prettyformat_arrays =
false, prettyformat_structs = false, vtblprint = false, unionprint = true,
addressprint = true, nibblesprint = false, objectprint = false, print_max =
200, print_max_chars = 0, 
          repeat_count_threshold = 10, output_format = 0, format = 0,
memory_tag_violations = true, stop_print_at_null = false, print_array_indexes =
false, deref_ref = true, static_field_print = true, pascal_static_field_print =
true, raw = false, summary = true, 
          symbol_print = true, max_depth = 20}
        type = 0x76f7820
        real_type = 0x76f7820
#6  0x00000000008942ec in common_val_print_checked (val=<optimized out>,
stream=<optimized out>, recurse=<optimized out>, options=<optimized out>,
language=<optimized out>) at ../../gdb-14.1/gdb/valprint.c:1184
No locals.
#7  0x00000000007e5d8a in print_frame_arg (fp_opts=...,
arg=arg@entry=0x7fffffffdbd0) at ../../gdb-14.1/gdb/stack.c:487
        language = 0xd73150 <cplus_language_defn>
        vp_opts = {prettyformat = Val_no_prettyformat, prettyformat_arrays =
false, prettyformat_structs = false, vtblprint = false, unionprint = true,
addressprint = true, nibblesprint = false, objectprint = false, print_max =
200, print_max_chars = 0, 
          repeat_count_threshold = 10, output_format = 0, format = 0,
memory_tag_violations = true, stop_print_at_null = false, print_array_indexes =
false, deref_ref = true, static_field_print = true, pascal_static_field_print =
true, raw = false, summary = true, 
          symbol_print = true, max_depth = 20}
        uiout = 0xf21b10
        stb = {<ui_file> = {_vptr.ui_file = 0xafba90 <vtable for
string_file+16>, m_applied_style = {m_foreground = {m_simple = true, {m_value =
-1, {m_red = 255 '\377', m_green = 255 '\377', m_blue = 255 '\377'}}},
m_background = {m_simple = true, {m_value = -1, {
                    m_red = 255 '\377', m_green = 255 '\377', m_blue = 255
'\377'}}}, m_intensity = ui_file_style::NORMAL, m_reverse = false}}, m_string =
"", m_term_out = false}
        __func__ = "print_frame_arg"
        arg_emitter = <optimized out>
        tuple_emitter = {m_uiout = 0xf21b10}
        style = {m_foreground = {m_simple = true, {m_value = -1, {m_red = 255
'\377', m_green = 255 '\377', m_blue = 255 '\377'}}}, m_background = {m_simple
= true, {m_value = -1, {m_red = 255 '\377', m_green = 255 '\377', m_blue = 255
'\377'}}}, 
          m_intensity = ui_file_style::NORMAL, m_reverse = false}
#8  0x00000000007ea0c2 in print_frame_args (fp_opts=..., func=<optimized out>,
frame=..., num=-1, stream=0xdb8d20) at ../../gdb-14.1/gdb/stack.c:883
        arg = {sym = 0x16cb05f0, val = 0xf0ce9e0, error = std::unique_ptr<char>
= {get() = 0x0}, entry_kind = 0xadfe37 <print_entry_values_no> "no"}
        entryarg = {sym = 0x16cb05f0, val = 0x0, error = std::unique_ptr<char>
= {get() = 0x0}, entry_kind = 0xadfe37 <print_entry_values_no> "no"}
        sym = 0x16cb05f0
        __for_range = @0x7fffffffdca0: {m_begin = {m_sym = 0x16cb0570, m_iter =
{d = {compunit_symtab = 0x16cb07f0, block = 0x16cb07f0}, name = 0x0, idx = -1,
which = FIRST_LOCAL_BLOCK, mdict_iter = {mdict = 0x16cb0830, iterator = {dict =
0x16cb0850, index = 0, 
                  current = 0x48f6fa49db}, current_idx = 0}}}, m_end = {m_sym =
0x0, m_iter = {d = {compunit_symtab = 0x1, block = 0x1}, name = 0x9cac78
<operator new(unsigned long)+24>, idx = 1, which = GLOBAL_BLOCK, mdict_iter = {
                mdict = 0x87cb75 <ui_out::push_level(ui_out_type)+21>, iterator
= {dict = 0x7fffffffdec0, index = 208603584, current = 0x3ffffe040},
current_idx = 65535}}}}
        __for_begin = {m_sym = 0x16cb05f0, m_iter = {d = {compunit_symtab =
0x16cb07f0, block = 0x16cb07f0}, name = 0x0, idx = -1, which =
FIRST_LOCAL_BLOCK, mdict_iter = {mdict = 0x16cb0830, iterator = {dict =
0x16cb0850, index = 1, current = 0x48f6fa49db}, 
              current_idx = 0}}}
        __for_end = <optimized out>
        b = 0x16cb07f0
        uiout = 0xf21b10
        first = <optimized out>
        highest_offset = -1
        args_printed = <optimized out>
        print_names = true
        print_args = true
        __func__ = "print_frame_args"

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