[lxml-dev] PyThread_release_lock segmentation fault
Eli Stevens (WG.c)
listsub at wickedgrey.com
Tue Jan 9 04:31:37 CET 2007
Hello,
I'm getting segmentation faults inside PyThread_release_lock when trying
to use lxml 1.1.2. The various stack traces I have seen seem to vary,
but they are all related to "__xmlRaiseError () from
/usr/lib/libxml2.so.2" (I haven't produced very many test cases, so
there might be other causes). The original lxml install was done with
easy_install, but I get the same results when I test the source directly.
I'm using libxml2-2.6.27, gcc 3.4.3, and python 2.4 on a relatively
recent redhat install.
I am able to use the standard libxml2 python bindings, so I don't think
there is an issue with the libxml2 install.
I installed the svn trunk-and-pyrex, and was able to compile and run
make test, but the tests failed with a number of errors that seemed to
be expected for using the dev trunk (wrong functionality, not
segfaults). lxml 1.1.1 also segfaults for me, which leads me to believe
there might be a bugfix on the trunk that hasn't been released yet. If
so, is there a revision that contains the change that works?
Below is a log of my session (the most interesting part is probably the
gdb stack trace down at the bottom). Here are the commands I entered:
gcc -v
python
^D
make clean
make test
gdb python
run test.py
bt
Can anyone tell if this is a problem on my end, or on lxml's? Is there
any more information that I can provide that might be of use?
Sorry if all this is a bit verbose. :)
Thanks,
Eli
---
elis at mapdev4:~/edit/external/tarball/lxml-1.1.2/src/lxml> gcc -v
Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.3/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-java-awt=gtk
--host=i386-redhat-linux
Thread model: posix
gcc version 3.4.3 20050227 (Red Hat 3.4.3-22.1)
elis at mapdev4:~/edit/external/tarball/lxml-1.1.2/src/lxml> python
Python 2.4 (#1, Nov 30 2004, 11:25:14)
[GCC 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
elis at mapdev4:~/edit/external/tarball/lxml-1.1.2> make clean
find . \( -name '*.o' -o -name '*.c' -o -name '*.so' -o -name
'*.py[cod]' -o -name '*.dll' \) -exec rm -f {} \;
rm -rf build
elis at mapdev4:~/edit/external/tarball/lxml-1.1.2> make test
python setup.py build_ext -i
Building lxml version 1.1.2
running build_ext
building 'lxml.etree' extension
creating build
creating build/temp.linux-i686-2.4
creating build/temp.linux-i686-2.4/src
creating build/temp.linux-i686-2.4/src/lxml
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -O3 -Wall
-Wstrict-prototypes -fPIC -I/usr/include/python2.4 -c src/lxml/etree.c
-o build/temp.linux-i686-2.4/src/lxml/etree.o -w -I/usr/local/include
-I/usr/local/include/libxml2
gcc -pthread -shared build/temp.linux-i686-2.4/src/lxml/etree.o -o
src/lxml/etree.so -L/usr/local/lib -lexslt -lxslt -lxml2 -lz -lm
building 'lxml.objectify' extension
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -O3 -Wall
-Wstrict-prototypes -fPIC -I/usr/include/python2.4 -c
src/lxml/objectify.c -o build/temp.linux-i686-2.4/src/lxml/objectify.o
-w -I/usr/local/include -I/usr/local/include/libxml2
gcc -pthread -shared build/temp.linux-i686-2.4/src/lxml/objectify.o -o
src/lxml/objectify.so -L/usr/local/lib -lexslt -lxslt -lxml2 -lz -lm
python test.py -p -v
TESTED VERSION:
Python: (2, 4, 0, 'final', 0)
lxml.etree: (1, 1, 2, 0)
libxml used: (2, 6, 16)
libxml compiled: (2, 6, 27)
libxslt used: (1, 1, 11)
libxslt compiled: (1, 1, 19)
1/656 ( 0.2%): test_attribute_based_lookup
(lxml.tests.test_classlookup.ClassLookupTestCase)make: ***
[test_inplace] Segmentation fault
elis at mapdev4:~/edit/external/tarball/lxml-1.1.2> gdb python
GNU gdb Red Hat Linux (6.3.0.0-0.31rh)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu"...(no debugging
symbols found)
Using host libthread_db library "/lib/tls/libthread_db.so.1".
(gdb) run test.py
Starting program: /usr/local/bin/python test.py
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1207994688 (LWP 25687)]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
TESTED VERSION:
Python: (2, 4, 0, 'final', 0)
lxml.etree: (1, 1, 2, 0)
libxml used: (2, 6, 16)
libxml compiled: (2, 6, 27)
libxslt used: (1, 1, 11)
libxslt compiled: (1, 1, 19)
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1207994688 (LWP 25687)]
0x00a10b4a in sem_post at GLIBC_2.0 () from /lib/tls/libpthread.so.0
(gdb) bt
#0 0x00a10b4a in sem_post at GLIBC_2.0 () from /lib/tls/libpthread.so.0
#1 0x080de5e2 in PyThread_release_lock ()
#2 0x0012430f in __pyx_f_5etree__receiveError
(__pyx_v_c_log_handler=0xb7c42bcc, __pyx_v_error=0x9b5e308) at
src/lxml/etree.c:15789
#3 0x00383ccc in __xmlRaiseError () from /usr/lib/libxml2.so.2
#4 0x0038525e in xmlKeepBlanksDefault () from /usr/lib/libxml2.so.2
#5 0x0040e58f in xmlSkipBlankChars () from /usr/lib/libxml2.so.2
#6 0x0041204a in xmlParseElement () from /usr/lib/libxml2.so.2
#7 0x003749ae in xmlParseDocument () from /usr/lib/libxml2.so.2
#8 0x00374b71 in xmlCleanupParser () from /usr/lib/libxml2.so.2
#9 0x00186726 in __pyx_f_5etree_11_BaseParser__parseDoc (__pyx_v_self=0x0,
__pyx_v_c_text=0xb7fda8d4 "<root xmlns=\"myNS\"
xmlns:other=\"otherNS\">\n <c1 a1=\"A1\" a2=\"A2\" other:a3=\"A3\">\n
<c2 a1=\"C2\">0</c2>\n <c2>1</c2>\n <other:c2>2</other:c2>\n
</c1>\n</root>", __pyx_v_c_len=159,
__pyx_v_c_filename=0x0) at src/lxml/etree.c:20945
#10 0x00137132 in __pyx_f_5etree__parseMemoryDocument
(__pyx_v_text=0xb7fda8c0, __pyx_v_url=0x8118bc0,
__pyx_v_parser=0xb7c4466c) at src/lxml/etree.c:22182
#11 0x0016accc in __pyx_f_5etree_XML (__pyx_self=0x0,
__pyx_args=0xb7ad0bac, __pyx_kwds=0x0) at src/lxml/etree.c:9712
#12 0x080b5122 in PyEval_EvalFrame ()
#13 0x080b569c in PyEval_EvalFrame ()
#14 0x080b5e22 in PyEval_EvalCodeEx ()
#15 0x080fcd9a in function_call ()
#16 0x0805bdb0 in PyObject_Call ()
#17 0x080641d5 in instancemethod_call ()
#18 0x0805bdb0 in PyObject_Call ()
#19 0x0808f352 in slot_tp_call ()
#20 0x0805bdb0 in PyObject_Call ()
#21 0x080b0e6d in PyEval_EvalFrame ()
#22 0x080b5e22 in PyEval_EvalCodeEx ()
#23 0x080fcd9a in function_call ()
#24 0x0805bdb0 in PyObject_Call ()
#25 0x080641d5 in instancemethod_call ()
#26 0x0805bdb0 in PyObject_Call ()
#27 0x0808f352 in slot_tp_call ()
#28 0x0805bdb0 in PyObject_Call ()
#29 0x080b0e6d in PyEval_EvalFrame ()
#30 0x080b569c in PyEval_EvalFrame ()
#31 0x080b569c in PyEval_EvalFrame ()
#32 0x080b5e22 in PyEval_EvalCodeEx ()
#33 0x080b5f8a in PyEval_EvalCode ()
#34 0x080d9f4c in PyRun_FileExFlags ()
#35 0x080da82e in PyRun_SimpleFileExFlags ()
#36 0x0805560f in Py_Main ()
#37 0x08054e3f in main ()
More information about the lxml-dev
mailing list