There is an Assertion 'ecma_object_check_class_name_is_object (obj_p)' failed at /jerry-core/ecma/operations/ecma-objects.c in JerryScript 3.0.0.
###### JerryScript revision

Commit: [a6ab5e9](https://github.com/jerryscript-project/jerryscript/commit/a6ab5e9abed70cdedf9f4e9c1dc379eb762ebf64)

Version: v3.0.0



###### Build platform

Ubuntu 18.04.5 LTS (Linux 4.19.128-microsoft-standard x86_64)

Ubuntu 18.04.5 LTS (Linux 5.4.0-44-generic x86_64)



###### Build steps

```bash
python ./tools/build.py --clean --debug --compile-flag=-fsanitize=address --compile-flag=-m32 --compile-flag=-g --strip=off --lto=off --logging=on --line-info=on --error-message=on --system-allocator=on --stack-limit=20
```



###### Test case
<details>
<summary>poc.js</summary>
<pre><code>

```javascript
let custom1 = BigInt(-4294967295);
let custom2 = Object(BigInt(0));

Object.prototype.toString.call(BigInt.prototype, Symbol.toStringTag, { value: (custom1) });
assert.sameValue(Object.prototype.toString.call(custom1), '[object test262]');
assert.sameValue(Object.prototype.toString.call(custom2), '[object test262]');
```
</code></pre>
</details>
​	

###### Execution steps & Output

```bash
$ ./jerryscript/build/bin/jerry poc.js

ICE: Assertion 'ecma_object_check_class_name_is_object (obj_p)' failed at jerryscript/jerry-core/ecma/operations/ecma-objects.c(ecma_object_get_class_name):3015.
Error: ERR_FAILED_INTERNAL_ASSERTION
[1]    35915 abort      jerry poc.js
```

Credits: Found by OWL337 team.
Assertion 'ecma_object_check_class_name_is_object (obj_p)' failed at jerryscript/jerry-core/ecma/operations/ecma-objects.c(ecma_object_get_class_name):3015.
This is a GitHub Issue
repo:jerryscript
owner:jerryscript-project
Title : Assertion 'ecma_object_check_class_name_is_object (obj_p)' failed at jerryscript/jerry-core/ecma/operations/ecma-objects.c(ecma_object_get_class_name):3015.
Issue date:

--- start body ---
###### JerryScript revision

Commit: [a6ab5e9](https://github.com/jerryscript-project/jerryscript/commit/a6ab5e9abed70cdedf9f4e9c1dc379eb762ebf64)

Version: v3.0.0



###### Build platform

Ubuntu 18.04.5 LTS (Linux 4.19.128-microsoft-standard x86_64)

Ubuntu 18.04.5 LTS (Linux 5.4.0-44-generic x86_64)



###### Build steps

```bash
python ./tools/build.py --clean --debug --compile-flag=-fsanitize=address --compile-flag=-m32 --compile-flag=-g --strip=off --lto=off --logging=on --line-info=on --error-message=on --system-allocator=on --stack-limit=20
```



###### Test case
<details>
<summary>poc.js</summary>
<pre><code>

```javascript
let custom1 = BigInt(-4294967295);
let custom2 = Object(BigInt(0));

Object.prototype.toString.call(BigInt.prototype, Symbol.toStringTag, { value: (custom1) });
assert.sameValue(Object.prototype.toString.call(custom1), '[object test262]');
assert.sameValue(Object.prototype.toString.call(custom2), '[object test262]');
```
</code></pre>
</details>
​	

###### Execution steps & Output

```bash
$ ./jerryscript/build/bin/jerry poc.js

ICE: Assertion 'ecma_object_check_class_name_is_object (obj_p)' failed at jerryscript/jerry-core/ecma/operations/ecma-objects.c(ecma_object_get_class_name):3015.
Error: ERR_FAILED_INTERNAL_ASSERTION
[1]    35915 abort      jerry poc.js
```

Credits: Found by OWL337 team.
--- end body ---

An assertion failure in JerryScript v3.0.0 indicates a potential vulnerability where an attacker can trigger an internal assertion failure by providing specially crafted JavaScript code. This could lead to Denial of Service (DoS) as the program aborts unexpectedly.