New issue 1988: pypy3: large read will make future os.system calls fail https://bitbucket.org/pypy/pypy/issue/1988/pypy3-large-read-will-make-future-ossystem
Christoph Reiter:
```
import os
open("/dev/null", "rb").read(4294967295)
print(os.system("true"))
```
prints -1 instead of 0
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