On 3/14/23 05:26, Dmitry Osipenko wrote: > @@ -633,7 +605,10 @@ int drm_gem_shmem_mmap(struct drm_gem_shmem_object > *shmem, struct vm_area_struct > return ret; > } > > + dma_resv_lock(shmem->base.resv, NULL); > ret = drm_gem_shmem_get_pages(shmem); > + dma_resv_unlock(shmem->base.resv);
Intel CI reported locking problem [1] here. It actually was also reported for v12, but I missed that report because of the other noisy reports. [1] https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_114671v2/shard-snb5/igt@prime_vgem@s...@rcs0.html The test does the following: 1. creates vgem 2. export it do dmabuf 3. mmaps dmabuf There is an obvious deadlock there. The DRM code assumes that mmap() is unlocked, while for dma-buf it's locked. I'll see how to fix it for v14. -- Best regards, Dmitry
