Unknown reason for segfault in simple program to draw a triangle

Question

I would like to draw a triangle with a C++ program. I compiled the program with g++, with the '-Wall' flags and it compiles with no warnings. However, I get a segmentation fault coming from the function glGenBuffers(1, &m_VertexBuffer);. I have tried replacing the type declaration from uint32_t to GLuint, but the issue persists.

#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>

int main()
{
    if (!glfwInit())
    {
        std::cout << "Failed glfwInit()" << std::endl;
        return 1;
    }

    GLFWwindow* window = glfwCreateWindow(600,600, "triangle", NULL, NULL);
    if (!window)
    {
        glfwTerminate();
        std::cout << "Failed to create window" << std::endl;
        return 1;
    }
    glfwMakeContextCurrent(window);

    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
    {
        glfwTerminate();
        std::cout << "Failed gladLoadGLLoader(...)" << std::endl;
        return 1;
    }
    
    float vertices[] = 
    {
        -.5f, -.5f, 0.f,
        .5f, .5f, 0.f,
        0.f, -.5f, 0.f
    }; //triangle

    uint32_t m_VertexBuffer;

    std::cout << "Generating buffer object from vertex array..." << std::endl;

    glGenBuffers(1, &m_VertexBuffer);

    std::cout << "Done." << std::endl;

    glBindBuffer(GL_ARRAY_BUFFER, m_VertexBuffer);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), &vertices[0], GL_STATIC_DRAW);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(float)*3, (void *) 0);
    glEnableVertexAttribArray(0);
    glViewport(0, 0, 600, 600);

    while(!glfwWindowShouldClose(window))
    {
        glClear(GL_COLOR_BUFFER_BIT);
        glDrawArrays(GL_TRIANGLES, 0, 3);
        glfwSwapBuffers(window);
        glfwPollEvents();
    }
    glfwTerminate();
}

When I execute the binary, here is the output of the terminal:

Generating buffer object from vertex array...
Segmentation fault

When I use gdb, here is the output (line 40 corresponds to the glGenBuffers(1, &m_VertexBuffer);) line.

Starting program: /home/jiageng/tri/build/tri 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) backtrace
#0  0x0000000000000000 in ?? ()
#1  0x0000555555557d8b in main () at /home/jiageng/tri/main.cpp:40

I see a black window called "triangle", but nothing is shown on this window.

Additional details: The code I am showing is adapted from a tutorial on youtube I was following. The working code of this tutorial is here (https://github.com/codetechandtutorials/tri/blob/main/main.cpp). The only things I have changed are replacing one-letter variable names with more descriptive terms, and added breakpoints and verbose statements.

I am on Windows Subsystem for Linux 2, and have verified that X11-port forwarding works properly so I can run GUI applications through VcXSrv.