Mix_PlayMusic causing memory corruption - c++

Question

I've been having trouble with a game I've been working on, where once I added music it started segfaulting in my frequently-called texture-loading code, between 5-30 secs after it started playing. The best I could come up with was that it is some sort of memory corruption. After a good week of unsuccessfully trying to debug it (trying things like GFlags pageheap), I managed to cut it down to the following code, which still exhibits the problem.
Sometimes this segfaults with the callstack going through SDL2_mixer.dll, but mostly it occurs in the SDL_CreateTextureFromSurface call, due to the renderer being in a bad state. numTextures gets to between 15000-40000 on my machine (Windows 10 x64, with program compiled for x86).
My gut tells me that there's an issue in my environment or code, rather than an issue in SDL itself, but I'm at a loss. Any help or insights would be greatly appreciated.
#include <SDL_image.h>
#include <SDL_mixer.h>
#include <cassert>
int main(int argc, char* argv[])
{
assert(SDL_Init(SDL_INIT_EVERYTHING) == 0);
SDL_Window * pWindow_ = SDL_CreateWindow(
"", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, 0x0);
assert(pWindow_ != nullptr);
SDL_Renderer * pRenderer_ = SDL_CreateRenderer(pWindow_, -1, 0);
assert(pRenderer_ != nullptr);
assert(Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 512) == 0);
Mix_Music * pMusic = Mix_LoadMUS("sounds/tranquility.wav");
assert(pMusic != nullptr);
assert(Mix_PlayMusic(pMusic, -1) == 0);
SDL_Surface * pSurface = IMG_Load("images/caution.png");
assert(pSurface != nullptr);
SDL_Texture * pTexture = SDL_CreateTextureFromSurface(pRenderer_, pSurface);
assert(pTexture != nullptr);
int numTextures = 0;
while (true)
{
numTextures += 10;
assert(pTexture != nullptr);
SDL_DestroyTexture(pTexture);
pTexture = SDL_CreateTextureFromSurface(pRenderer_, pSurface);
assert(pTexture != nullptr);
}
}

Answer 1

The solution turned out to be to update to the latest version of SDL (2.0.3 -> 2.0.5).
I started developing the project in question with an engine code base which I upgraded from SDL 1.2 to 2.0 about 2 years ago, when the latest version was 2.0.3.
When I recently added sound and music, I took the latest SDL_mixer, and didn't think to update SDL to the latest 2.0.5.
After getting the latest development and runtime libraries for SDL (and SDL_image and SDL_mixer for good measure), the problem disappeared.
I'm not entirely satisfied with this. I'm quite surprised that the newer SDL_mixer linked successfully with an older SDL, if they were not compatible. In addition, I can't find any resources online that suggest any compatibility issues. Therefore, I have an uneasy feeling there may have been something else going on, which was resolved incidentally by the upgrade.