Crash while new[] in tinyxml2 in android - c++

Question

I am looking into the CPP code which i am not very familiar with and facing a crash while assigning a constant simple string in tinyxml2. I have searched for 2 days and could not find any logic for this over the net.
This issue is hardly reproducible.
crash:
pid: 22847, tid: 22967, name: BluetoothAdapte >>> com.android.bluetooth <<<
signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0
r0 ab425974 r1 e4cf3de5 r2 80000000 r3 ab3f26d8
r4 ab425b00 r5 0000344e r6 00000000 r7 00000000
r8 00000000 r9 ab425bb8 sl 00000004 fp 00000002
ip a0000000 sp e4bd46c8 lr 00000000 pc 00000000 cpsr 800f0010
backtrace:
#00 pc 00000000 <unknown>
stack:
e4bd4688 01000000
e4bd468c f722fc4d /system/lib/libstdc++.so (operator new[](unsigned int)+8)
e4bd4690 ab3f26d8 [heap]
e4bd4694 e4ce76af /system/lib/hw/bluetooth.default.so (tinyxml2::StrPair::SetStr(char const*, int)+40)
e4bd4698 ab425974 [heap]
e4bd469c ab425bd0 [heap]
e4bd46a0 ab425950 [heap]
e4bd46a4 e4cf3de0 /system/lib/hw/bluetooth.default.so
e4bd46a8 e4d3ed20 /system/lib/hw/bluetooth.default.so
e4bd46ac e4ce895b /system/lib/hw/bluetooth.default.so (tinyxml2::XMLElement::FindOrCreateAttribute(char const*)+106)
code :
https://github.com/leethomason/tinyxml2/blob/master/tinyxml2.cpp: crashes at line 177
void StrPair::Reset()
{
if ( flags & NEEDS_DELETE ) {
delete [] start;
}
flags = 0;
start = 0;
end = 0;
}
void StrPair::SetStr( const char* str, int flags )
{
Reset();
size_t len = strlen( str );
start = new char[ len+1 ]; //crashes here
memcpy( start, str, len+1 );
end = start + len;
this->flags = flags | NEEDS_DELETE;
}