Crash on double list(lxml.etree.iterparse(f))

[Kurakin Alexander]

lxml 4.3.3 (Python 3.7, Anaconda, Linux 64bit)

test.py:

import lxml
import lxml.etree

with open('test.xml', 'rb') as f:
    list(
        lxml.etree.iterparse(f)
    )

    # Traceback (most recent call last):
    # File "test.py", line 18, in <module>
    # lxml.etree.iterparse(f)
    # File "src/lxml/iterparse.pxi", line 209, in lxml.etree.iterparse.__next__
    # File "src/lxml/iterparse.pxi", line 194, in lxml.etree.iterparse.__next__
    # File "src/lxml/iterparse.pxi", line 225, in lxml.etree.iterparse._read_more_events
    # File "src/lxml/parser.pxi", line 1380, in lxml.etree._FeedParser.close
    # Segmentation fault
    list(
        lxml.etree.iterparse(f)
    )

test.xml:

<?xml version="1.0" encoding="UTF-8"?>
<root></root>

(or any else)

[scoder (scoder)]

Cannot reproduce a crash. What I see is an exception on the second call, because it's reading from an "empty" file and finds no XML in it.

[Kurakin Alexander (kuraga333)]

Ok. Can you read output, please, and say if it looks like a Python bug? https://gist.github.com/kuraga/2633915c6689f7a9484bbd6d605043e1 . (BTW, lxml-4.4.1) Thanks.

[Kurakin Alexander (kuraga333)]

BTW, in Gentoo's Python 3.6 I have the same.

But in Python 2.7 I don't have segfault:

    Traceback (most recent call last):
      File "test.py", line 19, in <module>
        lxml.etree.iterparse(f)
      File "src/lxml/iterparse.pxi", line 209, in lxml.etree.iterparse.__next__
      File "/home/sasha/_lxml-bug/test.xml", line 0
    lxml.etree.XMLSyntaxError: no element found

Did you try Python 3 or 2?

[Kurakin Alexander (kuraga333)]

Fixed here: https://bugs.python.org/issue37467

My bug: https://bugs.python.org/issue38042