[pypy-dev] [cpyext] crash in PyThreadState_GetDict()

[Amaury Forgeot d'Arc]

2012/6/18 Stefan Behnel <stefan_ml at behnel.de>

> Hi,
>
> I'm getting reproducible segfaults in the PyThreadState_GetDict() function
> with lxml.


Is it similar to https://bugs.pypy.org/issue1175 ?
"PyThread_{get, set, delete}_key_value should work without the GIL held"


> For that, it's enough to build the latest lxml github master
> version in PyPy and start the test runner. You'll also need the github
> master version of Cython for that (with contains the PyPy port).
>
> I use these commands for building lxml under Linux:
>
> $ CFLAGS=-ggdb make PYTHON=pypy inplace
> $ pypy test.py -vv -p parser html    # no specific test, just not all
>
> The stack trace I get starts like this:
>
> """
> #0  0x0000000000b4fac5 in ?? ()
> #1  0x000000000103a813 in PyThreadState_GetDict ()
> #2  0x00007ffff51b15b0 in __pyx_f_4lxml_5etree__getGlobalErrorLog () at
> src/lxml/lxml.etree.c:32906
> #3  0x00007ffff51a8922 in __pyx_f_4lxml_5etree_13_BaseErrorLog__receive
> (__pyx_v_self=0x7ffff7f99378, __pyx_v_error=0x3205ed8) at
> src/lxml/lxml.etree.c:28299
> #4  0x00007ffff51fad46 in __pyx_f_4lxml_5etree__forwardParserError
> (__pyx_v__parser_context=0x3205c80, __pyx_v_error=0x3205ed8) at
> src/lxml/lxml.etree.c:82070
> #5  0x00007ffff51fadc7 in __pyx_f_4lxml_5etree__receiveParserError
> (__pyx_v_c_context=0x3205c80, __pyx_v_error=0x3205ed8) at
> src/lxml/lxml.etree.c:82126
> """
>
> Background: lxml frees the GIL when it starts parsing XML, then reacquires
> it to report any errors that occur and, while holding it, looks up the
> target error log object from thread global storage to find out who wants to
> know about the error. That's where it crashes above, right when it tries to
> get at the TLS dict.
>
> Any help is appreciated.
>
> Stefan
>
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>



-- 
Amaury Forgeot d'Arc
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