New submission from Marten H. van Kerkwijk <m...@astro.utoronto.ca>:
While debugging a strange failure with tests and np.memmap, I realized that the
following direct use of mmap reliably leads to a bus error. Here, obviously
mmap'ing a file, closing it, opening the file for writing but not writing
anything, and then again accessing the mmap is not something one should do (but
a test case did it anyway), but it would nevertheless be nice to avoid a crash!
```
import mmap
with open('test.dat', 'wb') as fh:
fh.write(b'abcdefghijklmnopqrstuvwxyz')
with open('test.dat', 'rb') as fh:
mm = mmap.mmap(fh.fileno(), 0, access=mmap.ACCESS_READ)
with open('test.dat', 'wb') as fh:
pass # Note: if something is written, then I get no bus error.
mm[2]
```
----------
components: Library (Lib)
messages: 369543
nosy: mhvk
priority: normal
severity: normal
status: open
title: accessing mmap of file that is overwritten causes bus error
type: crash
versions: Python 3.8
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40720>
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