[lxml-dev] Segfault and bus error when importing lxml.html.clean after importing webbrowser

Jon Rosebaugh chairos at gmail.com
Sat Feb 2 07:12:52 CET 2008


I was trying to use lxml.html.clean to sanitize comments in my blog.
Unfortunately, although I can import and use it in a standalone
console session, it fails within the webapp. Sometimes it segfaults,
and sometimes it's a bus error instead.
After going through all the imports to see what _they_ imported, I
finally tracked down a minimal example that can cause the problem:

import webbrowser
import lxml.html.clean

If I reverse the order of imports, everything works fine, so for the
moment I've worked around it by making sure that lxml.html.clean is
imported the very first thing.

I have lxml compiled from the 2.0 tgz from the site, libxml2 2.6.31
and libxslt 1.1.22 installed via macports (both the latest versions
macports has), Cython 0.9.6.11 installed, and I'm using Python 2.5.1
as downloaded from python.org for OS X.

Here's the crash log Mac OS X provides:
Process:         Python [82702]
Path:
/Library/Frameworks/Python.framework/Versions/2.5/Resources/Python.app/Contents/MacOS/Python
Identifier:      Python
Version:         ??? (???)
Code Type:       X86 (Native)
Parent Process:  bash [188]

Date/Time:       2008-02-02 00:05:49.472 -0600
OS Version:      Mac OS X 10.5.1 (9B18)
Report Version:  6

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000005
Crashed Thread:  0

Thread 0 Crashed:
0   libxml2.2.dylib               	0x91cda419 xmlDictLookup + 360
1   libxml2.2.dylib               	0x00d78728 xmlXPathCompExprAdd + 280
2   libxml2.2.dylib               	0x00d84e0c xmlXPathCompStep + 1004
3   libxml2.2.dylib               	0x00d85812
xmlXPathCompRelativeLocationPath + 98
4   libxml2.2.dylib               	0x00d86235 xmlXPathCompPathExpr + 1973
5   libxml2.2.dylib               	0x00d86c35 xmlXPathCompUnaryExpr + 213
6   libxml2.2.dylib               	0x00d86e3f
xmlXPathCompMultiplicativeExpr + 15
7   libxml2.2.dylib               	0x00d8702f xmlXPathCompAdditiveExpr + 15
8   libxml2.2.dylib               	0x00d8717f xmlXPathCompRelationalExpr + 15
9   libxml2.2.dylib               	0x00d8732f xmlXPathCompEqualityExpr + 15
10  libxml2.2.dylib               	0x00d8748f xmlXPathCompAndExpr + 15
11  libxml2.2.dylib               	0x00d87602 xmlXPathCompileExpr + 18
12  libxml2.2.dylib               	0x00d868ec xmlXPathCompPathExpr + 3692
13  libxml2.2.dylib               	0x00d86c35 xmlXPathCompUnaryExpr + 213
14  libxml2.2.dylib               	0x00d86e3f
xmlXPathCompMultiplicativeExpr + 15
15  libxml2.2.dylib               	0x00d8702f xmlXPathCompAdditiveExpr + 15
16  libxml2.2.dylib               	0x00d8717f xmlXPathCompRelationalExpr + 15
17  libxml2.2.dylib               	0x00d8732f xmlXPathCompEqualityExpr + 15
18  libxml2.2.dylib               	0x00d8748f xmlXPathCompAndExpr + 15
19  libxml2.2.dylib               	0x00d87602 xmlXPathCompileExpr + 18
20  libxml2.2.dylib               	0x00d87872 xmlXPathCompPredicate + 194
21  libxml2.2.dylib               	0x00d84d4e xmlXPathCompStep + 814
22  libxml2.2.dylib               	0x00d85812
xmlXPathCompRelativeLocationPath + 98
23  libxml2.2.dylib               	0x00d86235 xmlXPathCompPathExpr + 1973
24  libxml2.2.dylib               	0x00d86c35 xmlXPathCompUnaryExpr + 213
25  libxml2.2.dylib               	0x00d86e3f
xmlXPathCompMultiplicativeExpr + 15
26  libxml2.2.dylib               	0x00d8702f xmlXPathCompAdditiveExpr + 15
27  libxml2.2.dylib               	0x00d8717f xmlXPathCompRelationalExpr + 15
28  libxml2.2.dylib               	0x00d8732f xmlXPathCompEqualityExpr + 15
29  libxml2.2.dylib               	0x00d8748f xmlXPathCompAndExpr + 15
30  libxml2.2.dylib               	0x00d87602 xmlXPathCompileExpr + 18
31  libxml2.2.dylib               	0x00d8c6ca xmlXPathCtxtCompile + 90
32  etree.so                      	0x00bdc1d7
__pyx_pf_4lxml_5etree_5XPath___init__ + 551 (lxml.etree.c:79217)
33  org.python.python             	0x00448981 type_call + 166 (typeobject.c:436)
34  org.python.python             	0x003f9278 PyObject_Call + 45
(abstract.c:1860)
35  org.python.python             	0x00480851 PyEval_EvalFrameEx +
9242 (ceval.c:3775)
36  org.python.python             	0x00484cdc PyEval_EvalCodeEx + 1819
(ceval.c:2831)
37  org.python.python             	0x00484e90 PyEval_EvalCode + 87 (ceval.c:500)
38  org.python.python             	0x0049bcbe
PyImport_ExecCodeModuleEx + 193 (import.c:669)
39  org.python.python             	0x0049c114 load_source_module + 726
(import.c:953)
40  org.python.python             	0x0049cd9b import_submodule + 293
(import.c:2394)
41  org.python.python             	0x0049cfe9 load_next + 195 (import.c:2214)
42  org.python.python             	0x0049d4dd import_module_level +
213 (import.c:2002)
43  org.python.python             	0x0049d98d
PyImport_ImportModuleLevel + 45 (import.c:2066)
44  org.python.python             	0x00478917 builtin___import__ + 156
(bltinmodule.c:49)
45  org.python.python             	0x003f9278 PyObject_Call + 45
(abstract.c:1860)
46  org.python.python             	0x0047d5b2
PyEval_CallObjectWithKeywords + 112 (ceval.c:3433)
47  org.python.python             	0x00481464 PyEval_EvalFrameEx +
12333 (ceval.c:2063)
48  org.python.python             	0x00484cdc PyEval_EvalCodeEx + 1819
(ceval.c:2831)
49  org.python.python             	0x00484e90 PyEval_EvalCode + 87 (ceval.c:500)
50  org.python.python             	0x004a7cf2
PyRun_InteractiveOneFlags + 460 (pythonrun.c:1271)
51  org.python.python             	0x004a7f2e
PyRun_InteractiveLoopFlags + 85 (pythonrun.c:723)
52  org.python.python             	0x004a86da PyRun_AnyFileExFlags +
155 (pythonrun.c:690)
53  org.python.python             	0x004b5bb6 Py_Main + 3077 (main.c:523)
54  org.python.python             	0x00001f8e 0x1000 + 3982
55  org.python.python             	0x00001eb5 0x1000 + 3765

Thread 0 crashed with X86 Thread State (32-bit):
  eax: 0x009d0bd4  ebx: 0x91cda2c2  ecx: 0x00000004  edx: 0x0000e3d0
  edi: 0x00000005  esi: 0x00000005  ebp: 0xbfffd428  esp: 0xbfffd3f0
   ss: 0x0000001f  efl: 0x00010202  eip: 0x91cda419   cs: 0x00000017
   ds: 0x0000001f   es: 0x0000001f   fs: 0x00000000   gs: 0x00000037
  cr2: 0x00000005

Binary Images:
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/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libRadiance.dylib
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/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/ATS
0x95c3f000 - 0x95c9cffb  libstdc++.6.dylib ??? (???)
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/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices
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/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Ink.framework/Versions/A/Ink
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/System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration
0x96483000 - 0x965bbff7  libicucore.A.dylib ??? (???)
<afcea652ff2ec36885b2c81c57d06d4c> /usr/lib/libicucore.A.dylib
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/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/PrintCore.framework/Versions/A/PrintCore
0x96835000 - 0x9685cfff  libcups.2.dylib ??? (???)
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0x9685d000 - 0x96897ff7  com.apple.coreui 0.1 (60)
/System/Library/PrivateFrameworks/CoreUI.framework/Versions/A/CoreUI
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<f53c808e87d1184c0f9df63aef53ce0b> /usr/lib/libgcc_s.1.dylib
0x968a4000 - 0x968abffe  libbsm.dylib ??? (???)
<d25c63378a5029648ffd4b4669be31bf> /usr/lib/libbsm.dylib
0x968ea000 - 0x96c80ff7  com.apple.QuartzCore 1.5.1 (1.5.1)
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/System/Library/Frameworks/QuartzCore.framework/Versions/A/QuartzCore
0x96c81000 - 0x96ca5fff  libxslt.1.dylib ??? (???)
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/System/Library/Frameworks/DiskArbitration.framework/Versions/A/DiskArbitration
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0x96cb0000 - 0x96d24fef  libvMisc.dylib ??? (???)
/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvMisc.dylib
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/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLImage.dylib
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/usr/lib/system/libmathCommon.A.dylib
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(3.7.24) <d3180f9edbd9a5e6f283d6156aa3c602>
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0xffff0000 - 0xffff1780  libSystem.B.dylib ??? (???) /usr/lib/libSystem.B.dylib


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