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To free the fence from the amdgpu_fence_slab, need twice call_rcu, to avoid the amdgpu_fence_slab_fini call kmem_cache_destroy(amdgpu_fence_slab) before kmem_cache_free(amdgpu_fence_slab, fence), add rcu_barrier after drm_sched_entity_fini. The kmem_cache_free(amdgpu_fence_slab, fence)'s call trace as below: 1.drm_sched_entity_fini -> drm_sched_entity_cleanup -> dma_fence_put(entity->last_scheduled) -> drm_sched_fence_release_finished -> drm_sched_fence_release_scheduled -> call_rcu(&fence->finished.rcu, drm_sched_fence_free) 2.drm_sched_fence_free -> dma_fence_put(fence->parent) -> amdgpu_fence_release -> call_rcu(&f->rcu, amdgpu_fence_free) -> kmem_cache_free(amdgpu_fence_slab, fence); v2:put the barrier before the kmem_cache_destroy v3:put the dma_fence_put(fence->parent) before call_rcu in drm_sched_fence_release_scheduled Signed-off-by: Emily Deng <Emily.Deng@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.