freedreno: firefox crashes on video playback

System information

• OS: Arch
• GPU: a690
• Kernel version: v6.4-rc3
• Mesa version: 23.1.1
• Xserver version: 1.21.1.8
• Desktop manager and compositor: dwm

Describe the issue

Firefox (113.0.1) crashes consistently when opening https://hlsjs.video-dev.org/demo/ with the following error:

MESA: error: fd_bo_dmabuf:534: failed to get dmabuf fd: -1

Rob Clark suggested adding an assert that always triggers when this happens:

+      if (suballoc_bo(bo)) {
+          ERROR_MSG("attempt to export non sharable buffer");
+      }

Disabling suballocations by making sure use_heap is always false in fd_device_new() makes the problem go away.