Python PyEnchant分段错误或指针无效

Question

我有一个多线程Python应用程序，它调用PyEnchant。我不是Python专家，大部分代码来自第三方。我所做的是添加代码以从多线程应用程序调用PyEnchant。由于我做了更改，应用程序运行了不同的时间长度，然后崩溃。我在Ubuntu 12.04上运行它。我得到的错误如下：

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffc5ffd700 (LWP 6858)]
0x00007ffff4424854 in ?? () from /usr/lib/libenchant.so.1
(gdb) backtrace
#0  0x00007ffff4424854 in ?? () from /usr/lib/libenchant.so.1
#1  0x00007ffff442517d in enchant_dict_check () from /usr/lib/libenchant.so.1
#2  0x00007ffff48a2ea4 in ffi_call_unix64 () from /usr/lib/python2.7/lib-dynload/_ctypes.so
#3  0x00007ffff48a28c5 in ffi_call () from /usr/lib/python2.7/lib-dynload/_ctypes.so
#4  0x00007ffff48932c2 in _ctypes_callproc () from /usr/lib/python2.7/lib-dynload/_ctypes.so
#5  0x00007ffff4893aa2 in ?? () from /usr/lib/python2.7/lib-dynload/_ctypes.so
#6  0x00000000004c7c76 in PyObject_Call ()
#7  0x000000000042aa4a in PyEval_EvalFrameEx ()
#8  0x000000000042abe2 in PyEval_EvalFrameEx ()
#9  0x000000000042abe2 in PyEval_EvalFrameEx ()
#10 0x00000000004317f2 in PyEval_EvalCodeEx ()
#11 0x000000000054aa40 in ?? ()
#12 0x00000000004c7c76 in PyObject_Call ()
#13 0x000000000049e9ba in ?? ()
#14 0x00000000004c7c76 in PyObject_Call ()
#15 0x00000000004c7d36 in PyEval_CallObjectWithKeywords ()
#16 0x0000000000443e3a in ?? ()
#17 0x000000000042a862 in PyEval_EvalFrameEx ()
#18 0x000000000042abe2 in PyEval_EvalFrameEx ()
#19 0x000000000042abe2 in PyEval_EvalFrameEx ()

或

*** glibc detected *** /usr/bin/python: free(): invalid pointer: 0x00007fffd4000178 ***
(gdb) backtrace
#0  0x00007ffff68fa445 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff68fdbab in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007ffff6937e2e in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#3  0x00007ffff6942626 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x00007ffff4424861 in ?? () from /usr/lib/libenchant.so.1
#5  0x00007ffff442517d in enchant_dict_check () from /usr/lib/libenchant.so.1
#6  0x00007ffff48a2ea4 in ffi_call_unix64 () from /usr/lib/python2.7/lib-dynload/_ctypes.so
#7  0x00007ffff48a28c5 in ffi_call () from /usr/lib/python2.7/lib-dynload/_ctypes.so
#8  0x00007ffff48932c2 in _ctypes_callproc () from /usr/lib/python2.7/lib-dynload/_ctypes.so
#9  0x00007ffff4893aa2 in ?? () from /usr/lib/python2.7/lib-dynload/_ctypes.so
#10 0x00000000004c7c76 in PyObject_Call ()
#11 0x000000000042aa4a in PyEval_EvalFrameEx ()
#12 0x000000000042abe2 in PyEval_EvalFrameEx ()
#13 0x000000000042abe2 in PyEval_EvalFrameEx ()
#14 0x00000000004317f2 in PyEval_EvalCodeEx ()
#15 0x000000000054aa40 in ?? ()
#16 0x00000000004c7c76 in PyObject_Call ()
#17 0x000000000049e9ba in ?? ()
#18 0x00000000004c7c76 in PyObject_Call ()
#19 0x00000000004c7d36 in PyEval_CallObjectWithKeywords ()
#20 0x0000000000443e3a in ?? ()
#21 0x000000000042a862 in PyEval_EvalFrameEx ()
#22 0x000000000042abe2 in PyEval_EvalFrameEx ()

或

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffe57fa700 (LWP 17532)]
0x0000000000000000 in ?? ()
(gdb) backtrace
#0  0x0000000000000000 in ?? ()
#1  0x00007ffff3f5fe33 in g_hash_table_lookup () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ffff44245a3 in ?? () from /usr/lib/libenchant.so.1
#3  0x00007ffff442518b in enchant_dict_check () from /usr/lib/libenchant.so.1
#4  0x00007ffff48a2ea4 in ffi_call_unix64 () from /usr/lib/python2.7/lib-dynload/_ctypes.so
#5  0x00007ffff48a28c5 in ffi_call () from /usr/lib/python2.7/lib-dynload/_ctypes.so
#6  0x00007ffff48932c2 in _ctypes_callproc () from /usr/lib/python2.7/lib-dynload/_ctypes.so
#7  0x00007ffff4893aa2 in ?? () from /usr/lib/python2.7/lib-dynload/_ctypes.so
#8  0x00000000004c7c76 in PyObject_Call ()
#9  0x000000000042aa4a in PyEval_EvalFrameEx ()
#10 0x000000000042abe2 in PyEval_EvalFrameEx ()
#11 0x000000000042abe2 in PyEval_EvalFrameEx ()
#12 0x00000000004317f2 in PyEval_EvalCodeEx ()
#13 0x000000000054aa40 in ?? ()
#14 0x00000000004c7c76 in PyObject_Call ()
#15 0x000000000049e9ba in ?? ()
#16 0x00000000004c7c76 in PyObject_Call ()
#17 0x00000000004c7d36 in PyEval_CallObjectWithKeywords ()
#18 0x0000000000443e3a in ?? ()
#19 0x000000000042a862 in PyEval_EvalFrameEx ()
#20 0x000000000042abe2 in PyEval_EvalFrameEx ()
#21 0x000000000042abe2 in PyEval_EvalFrameEx ()
#22 0x000000000042abe2 in PyEval_EvalFrameEx ()

读了另一篇我试过的文章

ulimit -s unlimited

以及ulimit的其他各种值，但似乎没有帮助。

我已经监控了使用"top“运行的应用程序，它似乎没有占用太多资源。它有时运行5分钟，有时运行15分钟。在这些运行期间，它处理数百个字符串，并找到数百个未登录的单词。运行代码的机器没有任何已知的问题，它是我的开发机器，其他一切都运行得很稳定。

有没有人能解释这些错误的含义？在我的Python代码中，有什么我应该做或不应该做的事情可以解决这个问题吗？我猜这是一个内存问题(我对此知之甚少)，我是否应该检查内存泄漏等？

Answer 1

我做了更多的测试，发现它在单个工作线程上工作得很好。经过一些谷歌搜索，我发现http://aspell.net/在“需要做的事情”下面写了：“让Aspell线程安全。即使Aspell本身不是多线程的，我也希望它是线程安全的，这样它就可以被多线程程序使用。”我通过Enchant使用了PyEnchant的拼写，所以我猜我看到的是可以预期的。我联系了Enchant http://www.abisource.com/projects/enchant/的作者，他们说"Enchant本身就是线程安全的。不幸的是，它的一些后端可能不是，就像你在Aspell中发现的那样。这是我们可以在Enchant中解决的问题，我们可以通过序列化对Aspell字典的所有访问，从而对用户隐藏线程不安全。“我能提交一个增强请求吗。因此，我已经提交了增强请求，并期待在适当的时候进行增强。