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We're freeing GuC error log in uc_fini_hw() that matches corresponding uc_init_hw() but we missed the point that this log object is copied on error path and in case of failure in uc_init_hw() we will leak this object as uc_fini_hw() is never called. If we free this log object as part of the late uC cleanup, where we also release other firmware objects, we can avoid this BUG: [70841.001413] BUG drm_i915_gem_object (Tainted: G U W ): Objects remaining in drm_i915_gem_object on __kmem_cache_shutdown() [70841.001436] INFO: Slab 0x00000000c94e41af objects=21 used=1 fp=0x000000001d60c40a flags=0x8000000000008100 [70841.001466] Call Trace: [70841.001471] dump_stack+0x5e/0x8e [70841.001476] slab_err+0x99/0xb0 [70841.001483] ? __slab_alloc.isra.24.constprop.29+0x62/0x70 [70841.001491] ? __kmalloc+0x1f5/0x320 [70841.001497] __kmem_cache_shutdown+0x18b/0x400 [70841.001505] shutdown_cache+0x13/0x1c0 [70841.001511] kmem_cache_destroy+0x1c2/0x240 [70841.001517] ? __mutex_unlock_slowpath+0x38/0x270 [70841.001559] i915_gem_load_cleanup+0xbc/0x130 [i915] [70841.001595] i915_driver_cleanup_early+0x11/0x60 [i915] [70841.001630] i915_driver_load+0x708/0x1720 [i915] [70841.001638] ? trace_hardirqs_on_caller+0xe2/0x1c0 [70841.001673] i915_pci_probe+0x2d/0x90 [i915] [70841.001680] pci_device_probe+0x9c/0x120 [70841.001687] driver_probe_device+0x2a9/0x490 [70841.001694] __driver_attach+0xd9/0xe0 [70841.001700] ? driver_probe_device+0x490/0x490 [70841.001705] bus_for_each_dev+0x57/0x90 [70841.001712] bus_add_driver+0x1eb/0x260 [70841.001717] ? 0xffffffffa0685000 [70841.001723] driver_register+0x52/0xc0 [70841.001728] ? 0xffffffffa0685000 [70841.001733] do_one_initcall+0x39/0x170 [70841.001739] ? rcu_read_lock_sched_held+0x6f/0x80 [70841.001746] ? kmem_cache_alloc_trace+0x27b/0x2e0 [70841.001753] do_init_module+0x56/0x1ec [70841.001759] load_module+0x219e/0x2550 [70841.001766] ? vfs_read+0x121/0x140 [70841.001774] ? SyS_finit_module+0xa5/0xe0 [70841.001779] SyS_finit_module+0xa5/0xe0 [70841.001788] entry_SYSCALL_64_fastpath+0x22/0x8f [70841.001806] INFO: Object 0x00000000eab7ed96 @offset=6208 [70841.001850] INFO: Allocated in i915_gem_object_create.part.32+0x1f/0x260 [i915] age=38 cpu=0 pid=2708 [70841.001861] kmem_cache_alloc+0x23d/0x2d0 [70841.001897] i915_gem_object_create.part.32+0x1f/0x260 [i915] [70841.001937] intel_guc_allocate_vma+0x15/0x100 [i915] [70841.001977] intel_guc_log_create+0x34/0x1c0 [i915] [70841.002014] intel_guc_init+0x5a/0x100 [i915] [70841.002051] intel_uc_init+0x3e/0xb0 [i915] [70841.002089] i915_gem_init+0x18e/0x540 [i915] [70841.002123] i915_driver_load+0xa7a/0x1720 [i915] [70841.002159] i915_pci_probe+0x2d/0x90 [i915] [70841.002165] pci_device_probe+0x9c/0x120 [70841.002171] driver_probe_device+0x2a9/0x490 [70841.002177] __driver_attach+0xd9/0xe0 [70841.002182] bus_for_each_dev+0x57/0x90 [70841.002188] bus_add_driver+0x1eb/0x260 [70841.002193] driver_register+0x52/0xc0 [70841.002198] do_one_initcall+0x39/0x170 [70841.002462] kmem_cache_destroy drm_i915_gem_object: Slab cache still has objects [70841.002491] Call Trace: [70841.002497] dump_stack+0x5e/0x8e [70841.002503] kmem_cache_destroy+0x1e0/0x240 [70841.002509] ? __mutex_unlock_slowpath+0x38/0x270 [70841.002551] i915_gem_load_cleanup+0xbc/0x130 [i915] [70841.002586] i915_driver_cleanup_early+0x11/0x60 [i915] [70841.002621] i915_driver_load+0x708/0x1720 [i915] [70841.002629] ? trace_hardirqs_on_caller+0xe2/0x1c0 [70841.002664] i915_pci_probe+0x2d/0x90 [i915] [70841.002671] pci_device_probe+0x9c/0x120 [70841.002678] driver_probe_device+0x2a9/0x490 [70841.002684] __driver_attach+0xd9/0xe0 [70841.002690] ? driver_probe_device+0x490/0x490 [70841.002696] bus_for_each_dev+0x57/0x90 [70841.002702] bus_add_driver+0x1eb/0x260 [70841.002708] ? 0xffffffffa0685000 [70841.002713] driver_register+0x52/0xc0 [70841.002719] ? 0xffffffffa0685000 [70841.002724] do_one_initcall+0x39/0x170 [70841.002731] ? rcu_read_lock_sched_held+0x6f/0x80 [70841.002737] ? kmem_cache_alloc_trace+0x27b/0x2e0 [70841.002745] do_init_module+0x56/0x1ec [70841.002751] load_module+0x219e/0x2550 [70841.002758] ? vfs_read+0x121/0x140 [70841.002766] ? SyS_finit_module+0xa5/0xe0 [70841.002772] SyS_finit_module+0xa5/0xe0 [70841.002781] entry_SYSCALL_64_fastpath+0x22/0x8f Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com> Cc: Michal Winiarski <michal.winiarski@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180131173241.19704-2-michal.wajdeczko@intel.com Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.