Open Radar

 
Summary:
JSONSerialization crashes with long strings that are equal if compared case-insensitive.

This also happens in Objective-C with NSJSONSerialization

Steps to Reproduce:
Paste this into a playground/project and run:

import Cocoa

let k1 = "[\"/Users/marcelofabri/SwiftLint/source\",[[\"block_based_kvo\",\"warning\"],[\"class_delegate_protocol\",\"warning\"],[\"closing_brace\",\"warning\"],[\"closure_parameter_position\",\"warning\"],[\"colon\",\"warning, flexible_right_spacing: false, apply_to_dictionaries: true\"],[\"comma\",\"warning\"],[\"compiler_protocol_init\",\"warning\"],[\"control_statement\",\"warning\"],[\"custom_rules\",\"\"],[\"cyclomatic_complexity\",\"warning: 10, error: 20, ignores_case_statements: false\"],[\"discarded_notification_center_observer\",\"warning\"],[\"discouraged_direct_init\",\"warning, types: [\"Bundle\", \"Bundle.init\", \"UIDevice\", \"UIDevice.init\"]\"],[\"dynamic_inline\",\"error\"],[\"empty_enum_arguments\",\"warning\"],[\"empty_parameters\",\"warning\"],[\"empty_parentheses_with_trailing_closure\",\"warning\"],[\"fallthrough\",\"warning\"],[\"file_length\",\"warning: 400, error: 1000ignore_comment_only_lines: false\"],[\"for_where\",\"warning\"],[\"force_cast\",\"error\"],[\"force_try\",\"error\"],[\"function_body_length\",\"warning: 40, error: 100\"],[\"function_parameter_count\",\"warning: 5, error: 8\"],[\"generic_type_name\",\"(min_length) w/e: 1/0, (max_length) w/e: 20/1000, excluded: [], allowed_symbols: [], validates_start_with_lowercase: true\"],[\"identifier_name\",\"(min_length) w/e: 3/2, (max_length) w/e: 40/60, excluded: [], allowed_symbols: [], validates_start_with_lowercase: true\"],[\"implicit_getter\",\"warning\"],[\"is_disjoint\",\"warning\"],[\"large_tuple\",\"warning: 2, error: 3\"],[\"leading_whitespace\",\"warning\"],[\"legacy_cggeometry_functions\",\"warning\"],[\"legacy_constant\",\"warning\"],[\"legacy_constructor\",\"warning\"],[\"legacy_nsgeometry_functions\",\"warning\"],[\"line_length\",\"warning: 120, error: 200, ignores urls: false, ignores function declarations: false, ignores comments: false\"],[\"mark\",\"warning\"],[\"multiple_closures_with_trailing_closure\",\"warning\"],[\"nesting\",\"(type_level) w: 1, (statement_level) w: 5\"],[\"notification_center_detachment\",\"warning\"],[\"opening_brace\",\"warning\"],[\"operator_whitespace\",\"warning\"],[\"private_over_fileprivate\",\"warning, validate_extensions: false\"],[\"private_unit_test\",\"[\"private_unit_test\",\"\",\"Unit test marked `private` will not be run by XCTest.\",\"XCTestCase\",\"\",\"warning\"]\"],[\"protocol_property_accessors_order\",\"warning\"],[\"redundant_discardable_let\",\"warning\"],[\"redundant_optional_initialization\",\"warning\"],[\"redundant_string_enum_value\",\"warning\"],[\"redundant_void_return\",\"warning\"],[\"return_arrow_whitespace\",\"warning\"],[\"shorthand_operator\",\"error\"],[\"statement_position\",\"(statement_mode) default, (severity) warning\"],[\"superfluous_disable_command\",\"error\"],[\"switch_case_alignment\",\"warning\"],[\"syntactic_sugar\",\"warning\"],[\"todo\",\"warning\"],[\"trailing_comma\",\"warning, mandatory_comma: false\"],[\"trailing_newline\",\"warning\"],[\"trailing_semicolon\",\"warning\"],[\"trailing_whitespace\",\"warning, ignores_empty_lines: false, ignores_comments: true\"],[\"type_body_length\",\"warning: 200, error: 350\"],[\"type_name\",\"(min_length) w/e: 3/0, (max_length) w/e: 40/1000, excluded: [], allowed_symbols: [], validates_start_with_lowercase: true\"],[\"unneeded_break_in_switch\",\"warning\"],[\"unused_closure_parameter\",\"warning\"],[\"unused_enumerated\",\"warning\"],[\"unused_optional_binding\",\"warning, ignore_optional_try: false\"],[\"valid_ibinspectable\",\"warning\"],[\"vertical_parameter_alignment\",\"warning\"],[\"vertical_whitespace\",\"warning, max_empty_lines: 1\"],[\"void_return\",\"warning\"],[\"weak_delegate\",\"warning\"],[\"xctfail_message\",\"warning\"]]]"

let k2 = "[\"/Users/marcelofabri/SwiftLint/Source\",[[\"block_based_kvo\",\"warning\"],[\"class_delegate_protocol\",\"warning\"],[\"closing_brace\",\"warning\"],[\"closure_parameter_position\",\"warning\"],[\"colon\",\"warning, flexible_right_spacing: false, apply_to_dictionaries: true\"],[\"comma\",\"warning\"],[\"compiler_protocol_init\",\"warning\"],[\"control_statement\",\"warning\"],[\"custom_rules\",\"\"],[\"cyclomatic_complexity\",\"warning: 10, error: 20, ignores_case_statements: false\"],[\"discarded_notification_center_observer\",\"warning\"],[\"discouraged_direct_init\",\"warning, types: [\"Bundle\", \"Bundle.init\", \"UIDevice\", \"UIDevice.init\"]\"],[\"dynamic_inline\",\"error\"],[\"empty_enum_arguments\",\"warning\"],[\"empty_parameters\",\"warning\"],[\"empty_parentheses_with_trailing_closure\",\"warning\"],[\"fallthrough\",\"warning\"],[\"file_length\",\"warning: 400, error: 1000ignore_comment_only_lines: false\"],[\"for_where\",\"warning\"],[\"force_cast\",\"error\"],[\"force_try\",\"error\"],[\"function_body_length\",\"warning: 40, error: 100\"],[\"function_parameter_count\",\"warning: 5, error: 8\"],[\"generic_type_name\",\"(min_length) w/e: 1/0, (max_length) w/e: 20/1000, excluded: [], allowed_symbols: [], validates_start_with_lowercase: true\"],[\"identifier_name\",\"(min_length) w/e: 3/2, (max_length) w/e: 40/60, excluded: [], allowed_symbols: [], validates_start_with_lowercase: true\"],[\"implicit_getter\",\"warning\"],[\"is_disjoint\",\"warning\"],[\"large_tuple\",\"warning: 2, error: 3\"],[\"leading_whitespace\",\"warning\"],[\"legacy_cggeometry_functions\",\"warning\"],[\"legacy_constant\",\"warning\"],[\"legacy_constructor\",\"warning\"],[\"legacy_nsgeometry_functions\",\"warning\"],[\"line_length\",\"warning: 120, error: 200, ignores urls: false, ignores function declarations: false, ignores comments: false\"],[\"mark\",\"warning\"],[\"multiple_closures_with_trailing_closure\",\"warning\"],[\"nesting\",\"(type_level) w: 1, (statement_level) w: 5\"],[\"notification_center_detachment\",\"warning\"],[\"opening_brace\",\"warning\"],[\"operator_whitespace\",\"warning\"],[\"private_over_fileprivate\",\"warning, validate_extensions: false\"],[\"private_unit_test\",\"[\"private_unit_test\",\"\",\"Unit test marked `private` will not be run by XCTest.\",\"XCTestCase\",\"\",\"warning\"]\"],[\"protocol_property_accessors_order\",\"warning\"],[\"redundant_discardable_let\",\"warning\"],[\"redundant_optional_initialization\",\"warning\"],[\"redundant_string_enum_value\",\"warning\"],[\"redundant_void_return\",\"warning\"],[\"return_arrow_whitespace\",\"warning\"],[\"shorthand_operator\",\"error\"],[\"statement_position\",\"(statement_mode) default, (severity) warning\"],[\"superfluous_disable_command\",\"error\"],[\"switch_case_alignment\",\"warning\"],[\"syntactic_sugar\",\"warning\"],[\"todo\",\"warning\"],[\"trailing_comma\",\"warning, mandatory_comma: false\"],[\"trailing_newline\",\"warning\"],[\"trailing_semicolon\",\"warning\"],[\"trailing_whitespace\",\"warning, ignores_empty_lines: false, ignores_comments: true\"],[\"type_body_length\",\"warning: 200, error: 350\"],[\"type_name\",\"(min_length) w/e: 3/0, (max_length) w/e: 40/1000, excluded: [], allowed_symbols: [], validates_start_with_lowercase: true\"],[\"unneeded_break_in_switch\",\"warning\"],[\"unused_closure_parameter\",\"warning\"],[\"unused_enumerated\",\"warning\"],[\"unused_optional_binding\",\"warning, ignore_optional_try: false\"],[\"valid_ibinspectable\",\"warning\"],[\"vertical_parameter_alignment\",\"warning\"],[\"vertical_whitespace\",\"warning, max_empty_lines: 1\"],[\"void_return\",\"warning\"],[\"weak_delegate\",\"warning\"],[\"xctfail_message\",\"warning\"]]]"

let dict = [k1: "test", k2: "test2"]
let data = try? JSONSerialization.data(withJSONObject: dict, options: [.prettyPrinted, .sortedKeys])

Expected Results:
data is not nil

Actual Results:
malloc: *** error for object 0x7ffeef219e30: Non-aligned pointer being freed (2)


Version:
10.13.3

Notes: