Possible String related crash

Sat Oct 12 15:41:33 UTC 2013

I've had this issue for around a year and i've traced basically every line
of my code and cannot find any issues.  I've looked through the taglib code
and cannot find the exact cause either, but for some reason once in awhile
I'll get a stack trace that comes down to destroying a String

This is on Android so the stack traces are not the greatest:

#02 pc 000f9eff
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(operator delete(void*)+6)
#03 pc 000f9f07
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(operator delete[](void*)+2)
#04 pc 000d1eeb
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(TagLib::String::~String()+38)
#05 pc 000e4fd9
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(TagLib::TagUnion::comment() const+48)
#06 pc 00098b90
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(Java_gonemad_gmmp_taglibjni_Tag_scan+752)

#02 pc 000fa6f0
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(std::__stl_throw_length_error(char const*)+8)
#03 pc 000d224b
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(std::basic_string<wchar_t, std::char_traits<wchar_t>,
std::allocator<wchar_t> >::_M_compute_next_size(unsigned int)+50)
#04 pc 000d3287
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(std::basic_string<wchar_t, std::char_traits<wchar_t>,
std::allocator<wchar_t> >::_M_append(wchar_t const*, wchar_t const*)+102)
#05 pc 000d3365
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(TagLib::String::append(TagLib::String const&)+20)
#06 pc 000d33bf
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(operator+(TagLib::String const&, TagLib::String const&)+14)
#07 pc 000c2ad9
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(TagLib::ID3v1::genre(int)+36)
#08 pc 000c3c77
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(TagLib::ID3v2::FrameFactory::updateGenre(TagLib::ID3v2::TextIdentificationFrame*)
const+350)
#09 pc 000c3ecf
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(TagLib::ID3v2::FrameFactory::createFrame(TagLib::ByteVector const&,
TagLib::ID3v2::Header*) const+522)
#10 pc 000c5291
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(TagLib::ID3v2::Tag::parse(TagLib::ByteVector const&)+164)
#11 pc 000c544d
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(TagLib::ID3v2::Tag::read()+120)
#12 pc 000c5503
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(TagLib::ID3v2::Tag::Tag(TagLib::File*, long, TagLib::ID3v2::FrameFactory
const*)+102)
#13 pc 000c106f
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(TagLib::MPEG::File::read(bool, TagLib::AudioProperties::ReadStyle)+50)
#14 pc 000c12bb
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(TagLib::MPEG::File::File(char const*, bool,
TagLib::AudioProperties::ReadStyle)+106)
#15 pc 000e5a75
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(TagLib::FileRef::create(char const*, bool,
TagLib::AudioProperties::ReadStyle)+252)
#16 pc 000e60f1
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(TagLib::FileRef::FileRef(char const*, bool,
TagLib::AudioProperties::ReadStyle)+20)
#17 pc 000988ec
/data/app-lib/com.jrtstudio.AnotherMusicPlayer-1/libgm_audioengine.so
(Java_gonemad_gmmp_taglibjni_Tag_scan+76)

#00  pc 0001183a  /system/lib/libc.so (dlfree+57)
10-11 09:41:53.647 I/DEBUG   (303):     #01  pc 0000cf73
 /system/lib/libc.so (free+10)
10-11 09:41:53.647 I/DEBUG   (303):     #02  pc 000faccb
 /data/app-lib/gonemad.gmmp-1/libgm_audioengine.so (operator
delete(void*)+6)
10-11 09:41:53.647 I/DEBUG   (303):     #03  pc 000d2c6d
 /data/app-lib/gonemad.gmmp-1/libgm_audioengine.so
(TagLib::String::~String()+80)
10-11 09:41:53.647 I/DEBUG   (303):     #04  pc 000c3241
 /data/app-lib/gonemad.gmmp-1/libgm_audioengine.so
(TagLib::ID3v1::Tag::~Tag()+24)
10-11 09:41:53.647 I/DEBUG   (303):     #05  pc 000c327d
 /data/app-lib/gonemad.gmmp-1/libgm_audioengine.so
(TagLib::ID3v1::Tag::~Tag()+4)
10-11 09:41:53.647 I/DEBUG   (303):     #06  pc 000e587d
 /data/app-lib/gonemad.gmmp-1/libgm_audioengine.so
(TagLib::TagUnion::TagUnionPrivate::~TagUnionPrivate()+44)
10-11 09:41:53.647 I/DEBUG   (303):     #07  pc 000e58b7
 /data/app-lib/gonemad.gmmp-1/libgm_audioengine.so
(TagLib::TagUnion::~TagUnion()+22)
10-11 09:41:53.647 I/DEBUG   (303):     #08  pc 000c15f9
 /data/app-lib/gonemad.gmmp-1/libgm_audioengine.so
(TagLib::MPEG::File::~File()+36)
10-11 09:41:53.647 I/DEBUG   (303):     #09  pc 000c1615
 /data/app-lib/gonemad.gmmp-1/libgm_audioengine.so
(TagLib::MPEG::File::~File()+4)
10-11 09:41:53.647 I/DEBUG   (303):     #10  pc 000e61e3
 /data/app-lib/gonemad.gmmp-1/libgm_audioengine.so
(TagLib::FileRef::~FileRef()+42)
10-11 09:41:53.647 I/DEBUG   (303):     #11  pc 000e61f9
 /data/app-lib/gonemad.gmmp-1/libgm_audioengine.so
(TagLib::FileRef::~FileRef()+4)
10-11 09:41:53.647 I/DEBUG   (303):     #12  pc 00099ae4
 /data/app-lib/gonemad.gmmp-1/libgm_audioengine.so
(Java_gonemad_gmmp_taglibjni_Tag_scan+1396)

And I have many more similar but in different parts of taglib.  The only
common thing I can trace is the use of String::null.  The second trace i
posted happens in this chunk of code adding 2 static strings

String ID3v1::genre(int i)
{
  if(i >= 0 && i < genresSize)
    return genres[i] + String::null; // always make a copy
  return String::null;
}

Is there a possibility that String::null is somehow being deleted due to
some race condition?  I am using taglib in multiple threads at the same
time.  Any ideas?

-- 
-Kyle
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