drm-dumb: Non-thread-safe conversion to dmabufs
GstMemory *
gst_drm_dumb_memory_export_dmabuf (GstMemory * mem)
{
[...]
if (G_UNLIKELY (alloc->dmabuf_alloc == NULL))
alloc->dmabuf_alloc = gst_dmabuf_allocator_new ();
is not thread-safe. If called from two threads at once this will create to allocators and leak one.