[lldb-dev] [Bug 18655] New: tests: seg faults in python object cleanup during python shutdown

Wed Jan 29 09:35:53 PST 2014

http://llvm.org/bugs/show_bug.cgi?id=18655

            Bug ID: 18655
           Summary: tests: seg faults in python object cleanup during
                    python shutdown
           Product: lldb
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at cs.uiuc.edu
          Reporter: tfiala at google.com
    Classification: Unclassified

I am seeing several tests fail on Ubuntu 12.04 LTS x86_64 on top of tree LLDB
built with gcc 4.8.2 with libstdc++ (from gcc 4.8.2).

Here are the failures:

Ran 276 tests.
Failing Tests (5)
FAIL: LLDB (suite) :: TestAliases.py (Linux tfiala2.mtv.corp.google.com
3.2.5-gg1336 #1 SMP Thu Aug 29 02:37:18 PDT 2013 x86_64 x86_64)
FAIL: LLDB (suite) :: TestCommandScript.py (Linux tfiala2.mtv.corp.google.com
3.2.5-gg1336 #1 SMP Thu Aug 29 02:37:18 PDT 2013 x86_64 x86_64)
FAIL: LLDB (suite) :: TestConditionalBreak.py (Linux
tfiala2.mtv.corp.google.com 3.2.5-gg1336 #1 SMP Thu Aug 29 02:37:18 PDT 2013
x86_64 x86_64)
FAIL: LLDB (suite) :: TestDataFormatterCategories.py (Linux
tfiala2.mtv.corp.google.com 3.2.5-gg1336 #1 SMP Thu Aug 29 02:37:18 PDT 2013
x86_64 x86_64)
FAIL: LLDB (suite) :: TestDataFormatterGlobals.py (Linux
tfiala2.mtv.corp.google.com 3.2.5-gg1336 #1 SMP Thu Aug 29 02:37:18 PDT 2013
x86_64 x86_64)
make: *** [check-local] Error 1
make: Leaving directory `/mnt/ssd/work/svn/lgs/build/tools/lldb/test'

All of them are dumping core when the python executable wraps up the test runs
- the tests themselves all appear to be passing.

Here is a representative backtrace from my /usr/bin/python crash at the end of
TestAliases.py:

Using host libthread_db library "/usr/grte/v3/lib64/libthread_db.so.1".
Core was generated by `python ../llvm/tools/lldb/test/dotest.py -C gcc
--executable /usr/local/google/'.
Program terminated with signal 6, Aborted.
#0  0x00007fa54badd425 in __GI_raise (sig=<optimized out>) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
64      ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  0x00007fa54badd425 in __GI_raise (sig=<optimized out>) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007fa54bae0b8b in __GI_abort () at abort.c:91
#2  0x000000000053ed5d in Py_FatalError ()
#3  0x00000000004925cf in ?? ()
#4  0x000000000047f797 in ?? ()
#5  0x00007fa5462c0fd9 in lldb_private::PythonObject::Reset (this=0x1b63850,
py_obj=0x0)
    at
/mnt/ssd/work/svn/lgs/llvm/tools/lldb/source/Interpreter/../../include/lldb/Interpreter/PythonDataObjects.h:65
#6  0x00007fa5462c0f35 in lldb_private::PythonObject::~PythonObject
(this=0x1b63850, __in_chrg=<optimized out>)
    at
/mnt/ssd/work/svn/lgs/llvm/tools/lldb/source/Interpreter/../../include/lldb/Interpreter/PythonDataObjects.h:51
#7  0x00007fa5462c3a50 in
lldb_private::ScriptInterpreterPython::~ScriptInterpreterPython
(this=0x1b63810,
    __in_chrg=<optimized out>) at
/mnt/ssd/work/svn/lgs/llvm/tools/lldb/source/Interpreter/ScriptInterpreterPython.cpp:205
#8  0x00007fa5462c3ab4 in
lldb_private::ScriptInterpreterPython::~ScriptInterpreterPython
(this=0x1b63810,
    __in_chrg=<optimized out>) at
/mnt/ssd/work/svn/lgs/llvm/tools/lldb/source/Interpreter/ScriptInterpreterPython.cpp:207
#9  0x00007fa5461f16d4 in
std::default_delete<lldb_private::ScriptInterpreter>::operator()
(this=0x1798f38, __ptr=
    0x1b63810) at
/usr/local/gcc/gcc-4.8.2/include/c++/4.8.2/bits/unique_ptr.h:67
#10 0x00007fa5461f08d9 in std::unique_ptr<lldb_private::ScriptInterpreter,
std::default_delete<lldb_private::ScriptInterpreter> >::~unique_ptr
(this=0x1798f38, __in_chrg=<optimized out>)
    at /usr/local/gcc/gcc-4.8.2/include/c++/4.8.2/bits/unique_ptr.h:184
#11 0x00007fa5461edaab in lldb_private::CommandInterpreter::~CommandInterpreter
(this=0x1798cf0,
    __in_chrg=<optimized out>) at
/mnt/ssd/work/svn/lgs/llvm/tools/lldb/source/Interpreter/CommandInterpreter.cpp:2097
#12 0x00007fa5461edba0 in lldb_private::CommandInterpreter::~CommandInterpreter
(this=0x1798cf0,
    __in_chrg=<optimized out>) at
/mnt/ssd/work/svn/lgs/llvm/tools/lldb/source/Interpreter/CommandInterpreter.cpp:2099
#13 0x00007fa54608541a in
std::default_delete<lldb_private::CommandInterpreter>::operator()
(this=0x18302b8,
    __ptr=0x1798cf0) at
/usr/local/gcc/gcc-4.8.2/include/c++/4.8.2/bits/unique_ptr.h:67
#14 0x00007fa54608396d in std::unique_ptr<lldb_private::CommandInterpreter,
std::default_delete<lldb_private::CommandInterpreter> >::~unique_ptr
(this=0x18302b8, __in_chrg=<optimized out>)
    at /usr/local/gcc/gcc-4.8.2/include/c++/4.8.2/bits/unique_ptr.h:184
#15 0x00007fa54607b500 in lldb_private::Debugger::~Debugger (this=0x182ff20,
__in_chrg=<optimized out>)
    at /mnt/ssd/work/svn/lgs/llvm/tools/lldb/source/Core/Debugger.cpp:668
#16 0x00007fa54607b60e in lldb_private::Debugger::~Debugger (this=0x182ff20,
__in_chrg=<optimized out>)
    at /mnt/ssd/work/svn/lgs/llvm/tools/lldb/source/Core/Debugger.cpp:671
#17 0x00007fa546089c3a in std::_Sp_counted_ptr<lldb_private::Debugger*,
(__gnu_cxx::_Lock_policy)2>::_M_dispose (
    this=0x1b3c330) at
/usr/local/gcc/gcc-4.8.2/include/c++/4.8.2/bits/shared_ptr_base.h:290
#18 0x00007fa545f602b4 in
std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release (this=0x1b3c330)
    at /usr/local/gcc/gcc-4.8.2/include/c++/4.8.2/bits/shared_ptr_base.h:144
#19 0x00007fa545f5fd67 in
std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count
(this=0x1c12688,
    __in_chrg=<optimized out>) at
/usr/local/gcc/gcc-4.8.2/include/c++/4.8.2/bits/shared_ptr_base.h:546
#20 0x00007fa545f65cfc in std::__shared_ptr<lldb_private::Debugger,
(__gnu_cxx::_Lock_policy)2>::~__shared_ptr (
    this=0x1c12680, __in_chrg=<optimized out>) at
/usr/local/gcc/gcc-4.8.2/include/c++/4.8.2/bits/shared_ptr_base.h:781
#21 0x00007fa545f65d16 in std::shared_ptr<lldb_private::Debugger>::~shared_ptr
(this=0x1c12680, __in_chrg=<optimized out>)
    at /usr/local/gcc/gcc-4.8.2/include/c++/4.8.2/bits/shared_ptr.h:93
#22 0x00007fa545f6fd26 in lldb::SBDebugger::~SBDebugger (this=0x1c12680,
__in_chrg=<optimized out>)
    at /mnt/ssd/work/svn/lgs/llvm/tools/lldb/source/API/SBDebugger.cpp:247
#23 0x00007fa54621c35f in _wrap_delete_SBDebugger (args=0x17a64d0) at
LLDBWrapPython.cpp:14646
#24 0x00000000004f7496 in PyObject_Call ()
---Type <return> to continue, or q <return> to quit---
#25 0x00000000004f87cb in PyObject_CallFunctionObjArgs ()
#26 0x00007fa5461fb73d in SwigPyObject_dealloc (v=0x1d45600) at
LLDBWrapPython.cpp:1697
#27 0x000000000054878d in ?? ()
#28 0x000000000045d198 in ?? ()
#29 0x0000000000555d65 in ?? ()
#30 0x00000000004bef09 in PyDict_SetItem ()
#31 0x000000000044c9b9 in _PyModule_Clear ()
#32 0x00000000004369c8 in PyImport_Cleanup ()
#33 0x000000000047ec4c in Py_Finalize ()
#34 0x000000000047f148 in Py_Exit ()
#35 0x000000000047f27c in ?? ()
#36 0x0000000000424a8c in PyRun_SimpleFileExFlags ()
#37 0x0000000000425cb6 in Py_Main ()
#38 0x00007fa54bac876d in __libc_start_main (main=0x41bb00 <main>, argc=8,
ubp_av=0x7fffe1597538, init=<optimized out>,
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffe1597528)
at libc-start.c:226
#39 0x000000000041bb31 in _start ()

I am tracking this down now.  It may just require shutting down lldb correctly
within the test itself.  I had posted some of this in lldb-dev but I wanted to
move it here so it doesn't end up cluttering lldb-dev.

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/lldb-dev/attachments/20140129/55ed29cb/attachment.html>