[Bug python/17355] New: Crash on Python frame filters with unreadable arg

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17355

            Bug ID: 17355
           Summary: Crash on Python frame filters with unreadable arg
           Product: gdb
           Version: 7.8
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: jan.kratochvil at redhat dot com
              Host: x86_64-linux-gnu
            Target: x86_64-linux-gnu

https://bugzilla.redhat.com/show_bug.cgi?id=1126177

[New LWP 8203]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `gdb --core=d /usr/bin/anjuta'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  value_type (value=value@entry=0x0) at ../../gdb/value.c:932
932      return value->type;

Thread 1 (Thread 0x7f7e44958800 (LWP 8203)):
#0  value_type (value=value@entry=0x0) at ../../gdb/value.c:932
No locals.
#1  0x00000000005616f0 in py_print_single_arg (out=0x2e9f220, sym_name=0x0,
fa=0x7fff09338f70, fv=<optimized out>, opts=0x7fff09338fb0,
args_type=CLI_SCALAR_VALUES, print_args_field=0, language=0x8d9e40
<c_language_defn>) at ../../gdb/python/py-framefilter.c:445
        cleanups = 0x88a9a0 <sentinel_cleanup>
        val = 0x0
        except = {reason = 0, error = GDB_NO_ERROR, message = 0x0}
#2  0x00000000005623ba in enumerate_args (iter=0x0, iter@entry=<listiterator at
remote 0x7f7e3713c410>, out=0x7fff09338e00, out@entry=0x2e9f220,
args_type=1116932672, args_type@entry=CLI_SCALAR_VALUES,
print_args_field=print_args_field@entry=0, frame=0x1, frame@entry=0xa9f3fd8) at
../../gdb/python/py-framefilter.c:596
        arg = {sym = 0xb3b0720, val = 0x0, error = 0xae442f0 "value has been
optimized out", entry_kind = 0x8a54ae <print_entry_values_no> "no"}
        entryarg = {sym = 0xb3b0720, val = 0x0, error = 0x0, entry_kind =
0x8a54ae <print_entry_values_no> "no"}
        language = 0x8d9e40 <c_language_defn>
        sym = 0xb3b0720
        val = 0x0
        sym_name = 0xa0c0ff0 "data"
        opts = {prettyformat = Val_prettyformat_default, prettyformat_arrays =
0, prettyformat_structs = 0, vtblprint = 0, unionprint = 1, addressprint = 1,
objectprint = 0, print_max = 200, repeat_count_threshold = 10, output_format =
0, format = 0, stop_print_at_null = 0, print_array_indexes = 0, deref_ref = 1,
static_field_print = 1, pascal_static_field_print = 1, raw = 0, summary = 1,
symbol_print = 1}
        except = {reason = 0, error = GDB_NO_ERROR, message = 0x0}
#3  0x0000000000562624 in py_print_args
(filter=filter@entry=<FrameDecorator(_base=<gdb.Frame at remote
0x7f7e3713c470>) at remote 0x7f7e3713c8d0>, out=out@entry=0x2e9f220,
args_type=args_type@entry=CLI_SCALAR_VALUES, frame=frame@entry=0xa9f3fd8) at
../../gdb/python/py-framefilter.c:968
        old_chain = 0x71863e0
        except = {reason = 0, error = GDB_NO_ERROR, message = 0x0}
#4  0x0000000000562c28 in py_print_frame
(filter=filter@entry=<FrameDecorator(_base=<gdb.Frame at remote
0x7f7e3713c470>) at remote 0x7f7e3713c8d0>, flags=flags@entry=7,
args_type=args_type@entry=CLI_SCALAR_VALUES, out=out@entry=0x2e9f220,
indent=indent@entry=0, levels_printed=levels_printed@entry=0x67844f0) at
../../gdb/python/py-framefilter.c:1236
        has_addr = <optimized out>
        address = <optimized out>
        gdbarch = <optimized out>
        frame = <optimized out>
        cleanup_stack = 0xae4d290
        opts = {prettyformat = Val_prettyformat_default, prettyformat_arrays =
0, prettyformat_structs = 0, vtblprint = 0, unionprint = 1, addressprint = 1,
objectprint = 0, print_max = 200, repeat_count_threshold = 10, output_format =
0, format = 0, stop_print_at_null = 0, print_array_indexes = 0, deref_ref = 0,
static_field_print = 1, pascal_static_field_print = 1, raw = 0, summary = 0,
symbol_print = 1}
        py_inf_frame = <optimized out>
        elided = <optimized out>
        print_level = 1
        print_frame_info = <optimized out>
        print_args = <optimized out>
        print_locals = 0
        except = {reason = 0, error = GDB_NO_ERROR, message = 0x0}
#5  0x00000000005635c0 in gdbpy_apply_frame_filter (extlang=<optimized out>,
frame=0xa9aa650, flags=7, args_type=CLI_SCALAR_VALUES, out=0x2e9f220,
frame_low=0, frame_high=-1) at ../../gdb/python/py-framefilter.c:1518
        gdbarch = 0x3096380
        cleanups = 0xabb1ca0
        success = <optimized out>
        except = {reason = 0, error = GDB_NO_ERROR, message = 0x0}
        item = <FrameDecorator(_base=<gdb.Frame at remote 0x7f7e3713c470>) at
remote 0x7f7e3713c8d0>
        levels_printed = 0x67844f0
        count_printed = <optimized out>
#6  0x000000000060ecfa in apply_ext_lang_frame_filter (frame=0xa9aa650,
flags=7, args_type=CLI_SCALAR_VALUES, out=0x2e9f220, frame_low=1,
frame_low@entry=0, frame_high=-1) at ../../gdb/extension.c:553
        status = 0
        extlang = 0x0
#7  0x0000000000608b57 in backtrace_command_1 (count_exp=count_exp@entry=0x0,
show_locals=0, no_filters=0, from_tty=from_tty@entry=1) at
../../gdb/stack.c:1801
        flags = 7
        arg_type = CLI_SCALAR_VALUES
        fi = <optimized out>
        count = <optimized out>
        i = <optimized out>
        trailing = 0xa9aa650
        trailing_level = <optimized out>
        py_start = 0
        py_end = -1
        result = EXT_LANG_BT_ERROR
#8  0x000000000060903d in backtrace_command (arg=0x0, from_tty=1) at
../../gdb/stack.c:1916
        old_chain = 0xacb0680
        fulltrace_arg = <optimized out>
        arglen = <optimized out>
        argc = <optimized out>
        no_filters = <optimized out>
        user_arg = <optimized out>

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