I am running a osgEarth-based (v2.7) application that uses OpenSceneGraph 3.4.0
built with mingw (gcc v.4.9.2). When I am running in cache-only mode on some
machines I am seeing a crash in the osgDB::DatabasePager class. I have seen
some traffic in the past related to DatabasePager issues so I figured it would
be worth asking on here. It is crashing on a OSG info log statement which
seems strange. It looks like it is trying to iterate over an empty container.
Has anyone seen this behavior before? My OSG_NUM_DATABASE_THREADS are set to 4
and the machine it crashes on has 8 cores. I tried setting the value to 8 and
still got the same result.
Here is the call stack along with some information from GDB:
(gdb) info threads
Id Target Id Frame
18 Thread 8804.0x1ce8 0x77dd1f86 in ntdll!ZwWaitForWorkViaWorkerFactory ()
from C:\Windows\SysWOW64\ntdll.dll
17 Thread 8804.0x1738 0x77dd019d in ntdll!ZwWaitForMultipleObjects () from
C:\Windows\SysWOW64\ntdll.dll
16 Thread 8804.0x210c 0x77dd019d in ntdll!ZwWaitForMultipleObjects () from
C:\Windows\SysWOW64\ntdll.dll
15 Thread 8804.0x213c 0x61d50a0a in
std::_List_const_iterator<osg::ref_ptr<osg::Object> >::operator++
(this=0x54bbfd10)
at C:/Qt/Tools/mingw492_32/i686-w64-mingw32/include/c++/bits/stl_list.h:244
* 14 Thread 8804.0x18e8 0x77dd019d in ntdll!ZwWaitForMultipleObjects () from
C:\Windows\SysWOW64\ntdll.dll
13 Thread 8804.0x15e8 0x77dd019d in ntdll!ZwWaitForMultipleObjects () from
C:\Windows\SysWOW64\ntdll.dll
12 Thread 8804.0x1dd0 0x77dd019d in ntdll!ZwWaitForMultipleObjects () from
C:\Windows\SysWOW64\ntdll.dll
7 Thread 8804.0x1e98 0x77dd019d in ntdll!ZwWaitForMultipleObjects () from
C:\Windows\SysWOW64\ntdll.dll
5 Thread 8804.0x1d48 0x77dcfdd1 in ntdll!ZwDelayExecution () from
C:\Windows\SysWOW64\ntdll.dll
4 Thread 8804.0x910 0x77dd1f86 in ntdll!ZwWaitForWorkViaWorkerFactory ()
from C:\Windows\SysWOW64\ntdll.dll
3 Thread 8804.0x2190 0x77dd1f86 in ntdll!ZwWaitForWorkViaWorkerFactory ()
from C:\Windows\SysWOW64\ntdll.dll
2 Thread 8804.0xb14 0x77dd019d in ntdll!ZwWaitForMultipleObjects () from
C:\Windows\SysWOW64\ntdll.dll
1 Thread 8804.0x3ac 0x77de805d in ntdll!RtlGetNtGlobalFlags () from
C:\Windows\SysWOW64\ntdll.dll
(gdb) thread 15
[Switching to thread 15 (Thread 8804.0x213c)]
#0 0x61d50a0a in std::_List_const_iterator<osg::ref_ptr<osg::Object>
>::operator++ (this=0x54bbfd10)
at C:/Qt/Tools/mingw492_32/i686-w64-mingw32/include/c++/bits/stl_list.h:244
244 C:/Qt/Tools/mingw492_32/i686-w64-mingw32/include/c++/bits/stl_list.h:
No such file or directory.
(gdb) bt
#0 0x61d50a0a in std::_List_const_iterator<osg::ref_ptr<osg::Object>
>::operator++ (this=0x54bbfd10)
at C:/Qt/Tools/mingw492_32/i686-w64-mingw32/include/c++/bits/stl_list.h:244
#1 0x61d8a093 in
std::__distance<std::_List_const_iterator<osg::ref_ptr<osg::Object> > >
(__first=..., __last=...)
at
C:/Qt/Tools/mingw492_32/i686-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:82
#2 0x61d9740c in
std::distance<std::_List_const_iterator<osg::ref_ptr<osg::Object> > >
(__first=..., __last=...)
at
C:/Qt/Tools/mingw492_32/i686-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:118
#3 0x61d3e48c in std::list<osg::ref_ptr<osg::Object>,
std::allocator<osg::ref_ptr<osg::Object> > >::size (this=0x3b905d7c)
at C:/Qt/Tools/mingw492_32/i686-w64-mingw32/include/c++/bits/stl_list.h:887
#4 0x61cd828c in osgDB::DatabasePager::DatabaseThread::run (this=0x3c3285a0)
at
C:\msys\1.0\home\MWoodJ\Projects\OSG\OpenSceneGraph-3.4.0\src\osgDB\DatabasePager.cpp:731
#5 0x66a08538 in OpenThreads::ThreadPrivateActions::StartThread(void*)@4
(data=0x3c3285ac)
at
C:\msys\1.0\home\MWoodJ\Projects\OSG\OpenSceneGraph-3.4.0\src\OpenThreads\win32\Win32Thread.cpp:113
#6 0x77131287 in msvcrt!_itow_s () from C:\Windows\syswow64\msvcrt.dll
#7 0x77131328 in msvcrt!_endthreadex () from C:\Windows\syswow64\msvcrt.dll
#8 0x7757336a in KERNEL32!BaseThreadInitThunk () from
C:\Windows\syswow64\kernel32.dll
#9 0x77de9882 in ntdll!RtlInitializeExceptionChain () from
C:\Windows\SysWOW64\ntdll.dll
#10 0x77de9855 in ntdll!RtlInitializeExceptionChain () from
C:\Windows\SysWOW64\ntdll.dll
#11 0x00000000 in ?? ()
(gdb) frame 4
#4 0x61cd828c in osgDB::DatabasePager::DatabaseThread::run (this=0x3c3285a0)
at
C:\msys\1.0\home\MWoodJ\Projects\OSG\OpenSceneGraph-3.4.0\src\osgDB\DatabasePager.cpp:731
731
C:\msys\1.0\home\MWoodJ\Projects\OSG\OpenSceneGraph-3.4.0\src\osgDB\DatabasePager.cpp:
No such file or directory.
(gdb) info locals
fileLocationCallback = {_ptr = 0x0}
databaseRequest = {_ptr = 0x0}
readFromFileCache = false
fileCache = {_ptr = 0x0}
dr_loadOptions = {_ptr = 0x0}
fileName = {static npos = <optimized out>,
_M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> =
{<No data fields>}, <No data fields>},
_M_p = 0x3ab7e0c4 "î_î_î_î_î_î_î_î_î_î_L\033¿\b"}}
frameNumberLastRequest = 0
cacheNodes = false
firstTime = false
read_queue = {_ptr = 0x3b905d40}
out_queue = {_ptr = 0x3b923cf8}
(gdb) print read_queue
$3 = {_ptr = 0x3b905d40}
(gdb) print read_queue->size()
$4 = 0
(gdb) print _mode
$5 = osgDB::DatabasePager::DatabaseThread::HANDLE_NON_HTTP
(gdb) print _pager->_fileRequestQueue
$6 = {_ptr = 0x3b905d40}
(gdb) print _pager->_fileRequestQueue->size()
$7 = 0
(gdb) print _pager->_fileRequestQueue->_childrenToDeleteList
$8 = {<std::_List_base<osg::ref_ptr<osg::Object>,
std::allocator<osg::ref_ptr<osg::Object> > >> = {
_M_impl = {<std::allocator<std::_List_node<osg::ref_ptr<osg::Object> > >> =
{<__gnu_cxx::new_allocator<std::_List_node<os
g::ref_ptr<osg::Object> > >> = {<No data fields>}, <No data fields>}, _M_node =
{_M_next = 0x3b905d7c,
_M_prev = 0x3b905d7c}}}, <No data fields>}
(gdb) print _pager->_fileRequestQueue->_childrenToDeleteList->size()
Cannot resolve method osgDB::DatabasePager::ObjectList::size to any overloaded
instance
(gdb) print _pager->_fileRequestQueue->_childrenToDeleteList->size
$9 = {std::list<osg::ref_ptr<osg::Object>,
std::allocator<osg::ref_ptr<osg::Object> > >::size_type (const
std::list<osg::ref_
ptr<osg::Object>, std::allocator<osg::ref_ptr<osg::Object> > > * const)}
0x61d3e460 <std::list<osg::ref_ptr<osg::Object>, std
::allocator<osg::ref_ptr<osg::Object> > >::size() const>
(gdb) print _pager->_fileRequestQueue->_childrenToDeleteList.size()
$10 = 0
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=66732#66732
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