[issue24891] python aborts running under nohup

[Yi Ding]

Yi Ding added the comment:

test.sh attached

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Added file: http://bugs.python.org/file40210/test.sh

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[issue24891] python aborts running under nohup

[Yi Ding]

New submission from Yi Ding:

Looks like this bug https://bugs.python.org/issue7111 has resurfaced in python3 
(python 2.6 works as far as I can tell) at least on Macs.

I've attached a simple test script.

Steps:
1. SSH to remote server.
2. Run nohup ./test.sh 
3. exit SSH.
4. SSH back in and see that there are a bunch of errors in your nohup.out file.

--
files: test.py
messages: 248797
nosy: Yi Ding
priority: normal
severity: normal
status: open
title: python aborts running under nohup
type: crash
versions: Python 3.4
Added file: http://bugs.python.org/file40209/test.py

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[issue24891] python aborts running under nohup

[STINNER Victor]

STINNER Victor added the comment:

I can reproduce the bug with gdb if the file descriptor 0 is closed before 
calling:
std = create_stdio(iomod, fd, 0, stdin, encoding, errors);
and after the following lines were called:
fd = fileno(stdin);
if (!is_valid_fd(fd)) {

In initstdio () at Python/pylifecycle.c:1156.

create_stdio() fails in FileIO constructor, on the line:
   if (_Py_fstat(self-fd, fdfstat)  0)
of _io_FileIO___init___impl() at Modules/_io/fileio.c:480

It's a corner case of the issue #7111, I would call it a race condition.

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[issue24891] python aborts running under nohup

[STINNER Victor]

STINNER Victor added the comment:

Python 2 is not affected, PyFile_FromFile() doesn't check if the file 
descriptor is valid. On Python 3, we call fstat() to check the block size of 
the file descriptor to optimize buffering.

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versions: +Python 3.5, Python 3.6

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[issue24891] python aborts running under nohup

[Yi Ding]

Yi Ding added the comment:

Fatal Python error: Py_Initialize: can't initialize sys standard streams
OSError: [Errno 9] Bad file descriptor
./test.sh: line 4: 49632 Abort trap: 6   python3 test.py -o hello.txt

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[issue24891] python aborts running under nohup

[Robert Collins]

Robert Collins added the comment:

What sort of errors?

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nosy: +rbcollins

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[issue24891] python aborts running under nohup

[STINNER Victor]

STINNER Victor added the comment:

I'm unable to reproduce the issue on Linux with Python 3.4.2.

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components: +Macintosh
nosy: +haypo, ned.deily, ronaldoussoren

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[issue24891] python aborts running under nohup

[Yi Ding]

Yi Ding added the comment:

That's from my nohup.out. It might be a Mac OS specific thing.

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[issue24891] python aborts running under nohup

[STINNER Victor]

Changes by STINNER Victor victor.stin...@gmail.com:


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priority: normal - low

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