glfw: Creating / destroying lots of windows causing segfaults

I’ve got some unit tests for my library (CyGLFW3, a Cython binding), and each test is creating / destroying a window.

The tests individually are ok, but when I run them all together, I start getting random segfaults. This may be an OS-X only issue.

Here is an example stacktrace

0   libglfw3.3.dylib                0x0000000101805487 _glfwInputCursorMotion + 102
1   com.apple.AppKit                0x00007fff8a890324 -[NSWindow sendEvent:] + 1260
2   com.apple.AppKit                0x00007fff8a8318f2 -[NSApplication sendEvent:] + 2819
3   libglfw3.3.dylib                0x00000001018099a3 -[GLFWApplication sendEvent:] + 136
4   libglfw3.3.dylib                0x000000010180a69e _glfwPlatformPollEvents + 67
<snip>

0   ???                             0x00007fff5fbfaa48 0 + 140734799784520
1   com.apple.AppKit                0x00007fff8a890324 -[NSWindow sendEvent:] + 1260
2   com.apple.AppKit                0x00007fff8a8311be -[NSApplication sendEvent:] + 975
3   libglfw3.3.dylib                0x00000001018099a3 -[GLFWApplication sendEvent:] + 136
4   libglfw3.3.dylib                0x000000010180a69e _glfwPlatformPollEvents + 67