SDL audio callback stops after two iterations - c++

Question

Given the following code:
#include <SDL2/SDL.h>
#include <SDL2/SDL_audio.h>
#include <iostream>
#include <chrono>
#include <thread>
static void SDLCallback(void *userData, Uint8 *data, int bytes) {
std::cerr << "SDLCallback: " << bytes / sizeof(float) << "\n";
}
int main() {
using namespace std::literals;
SDL_Init(SDL_INIT_AUDIO);
SDL_AudioDeviceID m_deviceId{};
SDL_AudioSpec m_desired, m_obtained;
m_desired.freq = 48000;
m_desired.format = AUDIO_F32SYS;
m_desired.channels = 2;
m_desired.samples = 1024;
m_desired.callback = SDLCallback;
m_desired.userdata = nullptr;
m_deviceId = SDL_OpenAudioDevice(nullptr, 0, &m_desired, &m_obtained, 0);
std::cerr << "SDL device: " << m_deviceId << std::endl;
if (m_deviceId < 2) {
std::cerr << "SDL: Couldn't open audio: " << SDL_GetError() << std::endl;
exit(1);
}
std::cerr << "rate: " << m_obtained.freq << "\n";
std::cerr << "samples: " << m_obtained.samples << "\n";
std::cerr << "bytes: " << m_obtained.size << "\n";
std::cerr << "channels: " << (int)m_obtained.channels << "\n";
SDL_PauseAudioDevice(m_deviceId, 0);
for (int i = 0; i < 10; i++) {
std::this_thread::sleep_for(100ms);
std::cerr << (SDL_GetAudioDeviceStatus(m_deviceId) == SDL_AUDIO_PLAYING)
<< std::endl;
}
SDL_CloseAudioDevice(m_deviceId);
SDL_Quit();
}
I am seeing the following output:
$ ./a.out
SDL device: 2
rate: 48000
samples: 1024
bytes: 8192
channels:
SDLCallback: 2048
SDLCallback: 2048
1
1
1
1
1
1
1
1
1
1
<program gets stuck on SDL_CloseAudioDevice>
That is, the SDLCallback function is called only twice at the beginning then not anymore, yet the audio is still marked as running. I am using PulseAudio.
What can I do to prevent that ? Where is my program wrong ? It works if I kill PulseAudio, but PulseAudio works fine for all my other software.
And if it is not wrong, how can I make sure that my users will never encounter that issue ? How can I recover without getting the program stuck on SDL_CloseAudioDevice ? As PulseAudio is very common among Linux users.