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232674e1a6
The drm_sched_job_unschedulable trace point can access entity->dependency after it was cleared by the callback installed in drm_sched_entity_add_dependency_cb, causing: BUG: kernel NULL pointer dereference, address: 0000000000000020 [...] Workqueue: comp_1.1.0 drm_sched_run_job_work [gpu_sched] RIP: 0010:trace_event_raw_event_drm_sched_job_unschedulable+0x70/0xd0 [gpu_sched] To fix this we either need to keep a reference to the fence before setting up the callbacks, or move the trace_drm_sched_job_unschedulable calls into drm_sched_entity_add_dependency_cb where they can be done earlier. Fixes:76d97c870f("drm/sched: Trace dependencies for GPU jobs") Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com> Signed-off-by: Philipp Stanner <phasta@kernel.org> Link: https://lore.kernel.org/r/20250901124032.1955-1-pierre-eric.pelloux-prayer@amd.com (cherry picked from commitb2b8af21fe) Signed-off-by: Maxime Ripard <mripard@kernel.org>