New GitHub issue #119817 from Semnodime:<br>
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<pre>
# Crash report
### What happened?
```bash
# DEV=/dev/foo
# blockdev --getsize64 $DEV
1048576
# tail $DEV
# python3.12 bug.py
Bus error (core dumped)
# tail $DEV
hell#
```
```python
from mmap import mmap
with open('/dev/sda3', 'r+b') as file:
m = mmap(file.fileno(), 1024 ** 2 + 1)
m.seek(1024 ** 2 - 4)
for b in b'hello world!':
m.write(bytes([b]))
```
I hope you don't mind my reference to [Madagascar](https://www.imdb.com/title/tt0351283/fullcredits)
### CPython versions tested on:
3.12
### Operating systems tested on:
Linux
### Output from running 'python -VV' on the command line:
Python 3.12.3 (main, Apr 27 2024, 19:00:21) [GCC 11.4.0]
</pre>
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<a href="https://github.com/python/cpython/issues/119817">View on GitHub</a>
<p>Labels: type-crash</p>
<p>Assignee: </p>