Attachment 125843 Details for Bug 97381 – dmesg

dmesg

file_97381.txt (text/plain), 34.44 KB, created by mwa on 2016-08-17 11:39:54 UTC

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Creator: mwa

Created: 2016-08-17 11:39:54 UTC

Size: 34.44 KB

patch

obsolete

>[  706.898063] =============================================
>[  706.898078] [ INFO: possible recursive locking detected ]
>[  706.898094] 4.8.0-rc2-drm-intel-debug+ #21 Tainted: G     U  W      
>[  706.898108] ---------------------------------------------
>[  706.898123] rmmod/1889 is trying to acquire lock:
>[  706.898137]  (&(&n->list_lock)->rlock){-.-...}, at: [<ffffffff8151e7bb>] get_partial_node+0x5b/0x460
>[  706.898172] 
>               but task is already holding lock:
>[  706.898196]  (&(&n->list_lock)->rlock){-.-...}, at: [<ffffffff81525f1c>] __kmem_cache_shutdown+0xac/0x670
>[  706.898227] 
>               other info that might help us debug this:
>[  706.898252]  Possible unsafe locking scenario:
>
>[  706.898276]        CPU0
>[  706.898288]        ----
>[  706.898300]   lock(&(&n->list_lock)->rlock);
>[  706.898315]   lock(&(&n->list_lock)->rlock);
>[  706.898330] 
>                *** DEADLOCK ***
>
>[  706.898364]  May be due to missing lock nesting notation
>
>[  706.898403] 5 locks held by rmmod/1889:
>[  706.898416]  #0:  (&dev->mutex){......}, at: [<ffffffff81c50bed>] driver_detach+0x9d/0x1b0
>[  706.898461]  #1:  (&dev->mutex){......}, at: [<ffffffff81c50bfb>] driver_detach+0xab/0x1b0
>[  706.898491]  #2:  (cpu_hotplug.dep_map){++++++}, at: [<ffffffff81161607>] get_online_cpus+0x37/0x80
>[  706.898523]  #3:  (slab_mutex){+.+.+.}, at: [<ffffffff81491cf8>] kmem_cache_destroy+0x58/0x410
>[  706.898554]  #4:  (&(&n->list_lock)->rlock){-.-...}, at: [<ffffffff81525f1c>] __kmem_cache_shutdown+0xac/0x670
>[  706.898586] 
>               stack backtrace:
>[  706.898611] CPU: 0 PID: 1889 Comm: rmmod Tainted: G     U  W       4.8.0-rc2-drm-intel-debug+ #21
>[  706.898637] Hardware name: ASUS All Series/Z87-K, BIOS 1202 05/13/2014
>[  706.898653]  1ffff100371c7ec8 000000005177c688 ffff8801b8e3f590 ffffffff819588b5
>[  706.898682]  0000000041b58ab3 ffffffff829cb350 ffffffff819587e0 0000000000000000
>[  706.898710]  ffff880195d059a8 ffffffff851f5849 000000005177c688 ffffffff8122b2c0
>[  706.898739] Call Trace:
>[  706.898754]  [<ffffffff819588b5>] dump_stack+0xd5/0x150
>[  706.898771]  [<ffffffff819587e0>] ? _atomic_dec_and_lock+0xa0/0xa0
>[  706.898787]  [<ffffffff8122b2c0>] ? print_lock+0x90/0xa0
>[  706.898803]  [<ffffffff812273ef>] ? lockdep_on+0x1f/0x40
>[  706.898819]  [<ffffffff8122ee42>] validate_chain.isra.30+0x1972/0x2010
>[  706.898836]  [<ffffffff8122d4d0>] ? check_irq_usage+0x260/0x260
>[  706.898852]  [<ffffffff8122fb90>] ? print_usage_bug+0x480/0x480
>[  706.898868]  [<ffffffff8122d5c1>] ? validate_chain.isra.30+0xf1/0x2010
>[  706.898885]  [<ffffffff81229f27>] ? check_chain_key+0x157/0x230
>[  706.898901]  [<ffffffff8122d5c1>] ? validate_chain.isra.30+0xf1/0x2010
>[  706.898917]  [<ffffffff8122fc9c>] ? mark_lock+0x10c/0xba0
>[  706.898933]  [<ffffffff81229700>] ? match_held_lock.part.19+0x2e0/0x300
>[  706.898950]  [<ffffffff8122fb90>] ? print_usage_bug+0x480/0x480
>[  706.898966]  [<ffffffff81231788>] __lock_acquire+0x5a8/0xa80
>[  706.898982]  [<ffffffff812326d7>] lock_acquire+0x167/0x400
>[  706.898998]  [<ffffffff8151e7bb>] ? get_partial_node+0x5b/0x460
>[  706.899016]  [<ffffffff822dfec8>] _raw_spin_lock+0x38/0x50
>[  706.899031]  [<ffffffff8151e7bb>] ? get_partial_node+0x5b/0x460
>[  706.899047]  [<ffffffff8151e7bb>] get_partial_node+0x5b/0x460
>[  706.899063]  [<ffffffff81229f27>] ? check_chain_key+0x157/0x230
>[  706.899079]  [<ffffffff8122fb90>] ? print_usage_bug+0x480/0x480
>[  706.899096]  [<ffffffff8198d875>] ? _find_next_bit.part.0+0x35/0xd0
>[  706.899112]  [<ffffffff8151ed2c>] ___slab_alloc+0x16c/0xb40
>[  706.899128]  [<ffffffff8122fb90>] ? print_usage_bug+0x480/0x480
>[  706.899145]  [<ffffffff812c0094>] ? smp_call_function_many+0x64/0x710
>[  706.899162]  [<ffffffff81525ff8>] ? __kmem_cache_shutdown+0x188/0x670
>[  706.899179]  [<ffffffff812317ed>] ? __lock_acquire+0x60d/0xa80
>[  706.899195]  [<ffffffff81525ff8>] ? __kmem_cache_shutdown+0x188/0x670
>[  706.899211]  [<ffffffff8151f751>] __slab_alloc+0x51/0x90
>[  706.899227]  [<ffffffff81525ff8>] ? __kmem_cache_shutdown+0x188/0x670
>[  706.899243]  [<ffffffff81520762>] __kmalloc+0x382/0x670
>[  706.899260]  [<ffffffff81525ff8>] __kmem_cache_shutdown+0x188/0x670
>[  706.899276]  [<ffffffff81491684>] shutdown_cache+0x24/0xa0
>[  706.899293]  [<ffffffff81491f07>] kmem_cache_destroy+0x267/0x410
>[  706.899368]  [<ffffffffa035a633>] ? intel_runtime_pm_put+0xf3/0x1d0 [i915]
>[  706.899445]  [<ffffffffa03a95c2>] i915_gem_load_cleanup+0x42/0x80 [i915]
>[  706.899513]  [<ffffffffa031ca1d>] i915_driver_unload+0x1cd/0x260 [i915]
>[  706.899584]  [<ffffffffa032f8a1>] i915_pci_remove+0x31/0x50 [i915]
>[  706.899601]  [<ffffffff81a39f45>] pci_device_remove+0x75/0x170
>[  706.899618]  [<ffffffff81c4f5c5>] __device_release_driver+0xf5/0x220
>[  706.899635]  [<ffffffff81c50c9f>] driver_detach+0x14f/0x1b0
>[  706.899651]  [<ffffffff81c4e899>] bus_remove_driver+0xb9/0x1d0
>[  706.899667]  [<ffffffff81c523d3>] driver_unregister+0x43/0x70
>[  706.899683]  [<ffffffff81a36ef5>] pci_unregister_driver+0x25/0xe0
>[  706.899767]  [<ffffffffa04d0cf2>] i915_exit+0x1a/0xb0 [i915]
>[  706.899783]  [<ffffffff812c92fd>] SyS_delete_module+0x28d/0x3d0
>[  706.899799]  [<ffffffff812c9070>] ? free_module+0x680/0x680
>[  706.899815]  [<ffffffff8123075c>] ? mark_held_locks+0x2c/0x130
>[  706.899832]  [<ffffffff822e09e2>] ? entry_SYSCALL_64_fastpath+0x5/0xbd
>[  706.899849]  [<ffffffff812309ee>] ? trace_hardirqs_on_caller+0x18e/0x3f0
>[  706.899866]  [<ffffffff8100501a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
>[  706.899883]  [<ffffffff822e09fc>] entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.899962] =============================================================================
>[  706.899989] BUG i915_gem_vma (Tainted: G     U  W      ): Objects remaining in i915_gem_vma on __kmem_cache_shutdown()
>[  706.900015] -----------------------------------------------------------------------------
>
>[  706.900052] INFO: Slab 0xffffea0006c72500 objects=18 used=9 fp=0xffff8801b1c97840 flags=0x5fff8000004080
>[  706.900079] CPU: 0 PID: 1889 Comm: rmmod Tainted: G    BU  W       4.8.0-rc2-drm-intel-debug+ #21
>[  706.900105] Hardware name: ASUS All Series/Z87-K, BIOS 1202 05/13/2014
>[  706.900120]  ffffea0006c72500 000000005177c688 ffff8801b8e3fa78 ffffffff819588b5
>[  706.900149]  0000000041b58ab3 ffffffff829cb350 ffffffff819587e0 ffff8801b8e3fa20
>[  706.900177]  ffffffff00000010 ffff8801b8e3fa88 000000005177c688 000000005177c688
>[  706.900205] Call Trace:
>[  706.900220]  [<ffffffff819588b5>] dump_stack+0xd5/0x150
>[  706.900236]  [<ffffffff819587e0>] ? _atomic_dec_and_lock+0xa0/0xa0
>[  706.900253]  [<ffffffff81515f85>] slab_err+0xb5/0xf0
>[  706.900269]  [<ffffffff8152058c>] ? __kmalloc+0x1ac/0x670
>[  706.900285]  [<ffffffff81526017>] __kmem_cache_shutdown+0x1a7/0x670
>[  706.900302]  [<ffffffff81491684>] shutdown_cache+0x24/0xa0
>[  706.900318]  [<ffffffff81491f07>] kmem_cache_destroy+0x267/0x410
>[  706.900391]  [<ffffffffa035a633>] ? intel_runtime_pm_put+0xf3/0x1d0 [i915]
>[  706.900467]  [<ffffffffa03a95c2>] i915_gem_load_cleanup+0x42/0x80 [i915]
>[  706.900535]  [<ffffffffa031ca1d>] i915_driver_unload+0x1cd/0x260 [i915]
>[  706.900606]  [<ffffffffa032f8a1>] i915_pci_remove+0x31/0x50 [i915]
>[  706.900623]  [<ffffffff81a39f45>] pci_device_remove+0x75/0x170
>[  706.900639]  [<ffffffff81c4f5c5>] __device_release_driver+0xf5/0x220
>[  706.900656]  [<ffffffff81c50c9f>] driver_detach+0x14f/0x1b0
>[  706.900672]  [<ffffffff81c4e899>] bus_remove_driver+0xb9/0x1d0
>[  706.900688]  [<ffffffff81c523d3>] driver_unregister+0x43/0x70
>[  706.900704]  [<ffffffff81a36ef5>] pci_unregister_driver+0x25/0xe0
>[  706.900787]  [<ffffffffa04d0cf2>] i915_exit+0x1a/0xb0 [i915]
>[  706.900803]  [<ffffffff812c92fd>] SyS_delete_module+0x28d/0x3d0
>[  706.900819]  [<ffffffff812c9070>] ? free_module+0x680/0x680
>[  706.900835]  [<ffffffff8123075c>] ? mark_held_locks+0x2c/0x130
>[  706.900852]  [<ffffffff822e09e2>] ? entry_SYSCALL_64_fastpath+0x5/0xbd
>[  706.900868]  [<ffffffff812309ee>] ? trace_hardirqs_on_caller+0x18e/0x3f0
>[  706.900885]  [<ffffffff8100501a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
>[  706.900902]  [<ffffffff822e09fc>] entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.900918] INFO: Object 0xffff8801b1c94740 @offset=1856
>[  706.900993] INFO: Allocated in __i915_vma_create+0xcb/0x4f0 [i915] age=37960 cpu=2 pid=1815
>[  706.901019] 	___slab_alloc+0x7eb/0xb40
>[  706.901033] 	__slab_alloc+0x51/0x90
>[  706.901048] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.901119] 	__i915_vma_create+0xcb/0x4f0 [i915]
>[  706.901192] 	i915_vma_create+0xe/0x10 [i915]
>[  706.901264] 	i915_gem_create_context+0x5d3/0x8b0 [i915]
>[  706.901336] 	i915_gem_context_open+0x54/0xa0 [i915]
>[  706.901411] 	i915_gem_open+0x19c/0x260 [i915]
>[  706.901478] 	i915_driver_open+0xe/0x10 [i915]
>[  706.901518] 	drm_open+0x588/0xc00 [drm]
>[  706.901557] 	drm_stub_open+0x1ce/0x2b0 [drm]
>[  706.901572] 	chrdev_open+0x1da/0x370
>[  706.901587] 	do_dentry_open+0x38c/0x610
>[  706.901601] 	vfs_open+0xb8/0x170
>[  706.901615] 	path_openat+0xe77/0x1fc0
>[  706.901629] 	do_filp_open+0x137/0x200
>[  706.901643] INFO: Object 0xffff8801b1c951c0 @offset=4544
>[  706.901716] INFO: Allocated in __i915_vma_create+0xcb/0x4f0 [i915] age=26599 cpu=2 pid=1815
>[  706.901743] 	___slab_alloc+0x7eb/0xb40
>[  706.901757] 	__slab_alloc+0x51/0x90
>[  706.901771] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.901842] 	__i915_vma_create+0xcb/0x4f0 [i915]
>[  706.901916] 	i915_gem_obj_lookup_or_create_vma+0x36/0x40 [i915]
>[  706.901988] 	eb_lookup_vmas+0x4c0/0x800 [i915]
>[  706.902060] 	i915_gem_do_execbuffer.isra.8+0xb16/0x24a0 [i915]
>[  706.902133] 	i915_gem_execbuffer2+0x143/0x3c0 [i915]
>[  706.902171] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.902186] 	do_vfs_ioctl+0x15e/0xd70
>[  706.902201] 	SyS_ioctl+0x79/0x90
>[  706.902215] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.902229] INFO: Object 0xffff8801b1c95540 @offset=5440
>[  706.902302] INFO: Allocated in __i915_vma_create+0xcb/0x4f0 [i915] age=26571 cpu=0 pid=1815
>[  706.902328] 	___slab_alloc+0x7eb/0xb40
>[  706.902342] 	__slab_alloc+0x51/0x90
>[  706.902356] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.902455] 	__i915_vma_create+0xcb/0x4f0 [i915]
>[  706.902528] 	i915_vma_create+0xe/0x10 [i915]
>[  706.902602] 	i915_gem_render_state_init+0x1b4/0xbe0 [i915]
>[  706.902679] 	intel_rcs_ctx_init+0x83/0x400 [i915]
>[  706.902750] 	do_rcs_switch+0xada/0x1820 [i915]
>[  706.902821] 	i915_switch_context+0xd9/0x6b0 [i915]
>[  706.902903] 	execbuf_submit+0x2c0/0xf2e [i915]
>[  706.902975] 	i915_gem_do_execbuffer.isra.8+0xf77/0x24a0 [i915]
>[  706.903049] 	i915_gem_execbuffer2+0x143/0x3c0 [i915]
>[  706.903087] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.903101] 	do_vfs_ioctl+0x15e/0xd70
>[  706.903116] 	SyS_ioctl+0x79/0x90
>[  706.903130] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.903144] INFO: Object 0xffff8801b1c958c0 @offset=6336
>[  706.903217] INFO: Allocated in __i915_vma_create+0xcb/0x4f0 [i915] age=26210 cpu=1 pid=1820
>[  706.903243] 	___slab_alloc+0x7eb/0xb40
>[  706.903257] 	__slab_alloc+0x51/0x90
>[  706.903271] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.903343] 	__i915_vma_create+0xcb/0x4f0 [i915]
>[  706.903416] 	i915_gem_obj_lookup_or_create_vma+0x36/0x40 [i915]
>[  706.903488] 	eb_lookup_vmas+0x4c0/0x800 [i915]
>[  706.903561] 	i915_gem_do_execbuffer.isra.8+0xb16/0x24a0 [i915]
>[  706.903633] 	i915_gem_execbuffer2+0x143/0x3c0 [i915]
>[  706.903671] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.903686] 	do_vfs_ioctl+0x15e/0xd70
>[  706.903700] 	SyS_ioctl+0x79/0x90
>[  706.903714] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.903728] INFO: Object 0xffff8801b1c95fc0 @offset=8128
>[  706.903801] INFO: Allocated in __i915_vma_create+0xcb/0x4f0 [i915] age=26161 cpu=1 pid=1820
>[  706.903827] 	___slab_alloc+0x7eb/0xb40
>[  706.903842] 	__slab_alloc+0x51/0x90
>[  706.903856] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.903927] 	__i915_vma_create+0xcb/0x4f0 [i915]
>[  706.904000] 	i915_gem_obj_lookup_or_create_vma+0x36/0x40 [i915]
>[  706.904073] 	eb_lookup_vmas+0x4c0/0x800 [i915]
>[  706.904145] 	i915_gem_do_execbuffer.isra.8+0xb16/0x24a0 [i915]
>[  706.904217] 	i915_gem_execbuffer2+0x143/0x3c0 [i915]
>[  706.904255] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.904270] 	do_vfs_ioctl+0x15e/0xd70
>[  706.904285] 	SyS_ioctl+0x79/0x90
>[  706.904299] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.904313] INFO: Object 0xffff8801b1c96340 @offset=9024
>[  706.904386] INFO: Allocated in __i915_vma_create+0xcb/0x4f0 [i915] age=26205 cpu=1 pid=1820
>[  706.904412] 	___slab_alloc+0x7eb/0xb40
>[  706.904426] 	__slab_alloc+0x51/0x90
>[  706.904440] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.904511] 	__i915_vma_create+0xcb/0x4f0 [i915]
>[  706.904585] 	i915_vma_create+0xe/0x10 [i915]
>[  706.904658] 	i915_gem_render_state_init+0x1b4/0xbe0 [i915]
>[  706.904735] 	intel_rcs_ctx_init+0x83/0x400 [i915]
>[  706.904806] 	do_rcs_switch+0xada/0x1820 [i915]
>[  706.904877] 	i915_switch_context+0xd9/0x6b0 [i915]
>[  706.904959] 	execbuf_submit+0x2c0/0xf2e [i915]
>[  706.905032] 	i915_gem_do_execbuffer.isra.8+0xf77/0x24a0 [i915]
>[  706.905104] 	i915_gem_execbuffer2+0x143/0x3c0 [i915]
>[  706.905142] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.905157] 	do_vfs_ioctl+0x15e/0xd70
>[  706.905171] 	SyS_ioctl+0x79/0x90
>[  706.905185] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.905199] INFO: Object 0xffff8801b1c96a40 @offset=10816
>[  706.905272] INFO: Allocated in __i915_vma_create+0xcb/0x4f0 [i915] age=26578 cpu=0 pid=1815
>[  706.905298] 	___slab_alloc+0x7eb/0xb40
>[  706.905313] 	__slab_alloc+0x51/0x90
>[  706.905327] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.905398] 	__i915_vma_create+0xcb/0x4f0 [i915]
>[  706.905472] 	i915_gem_obj_lookup_or_create_vma+0x36/0x40 [i915]
>[  706.905544] 	eb_lookup_vmas+0x4c0/0x800 [i915]
>[  706.905616] 	i915_gem_do_execbuffer.isra.8+0xb16/0x24a0 [i915]
>[  706.905688] 	i915_gem_execbuffer2+0x143/0x3c0 [i915]
>[  706.905727] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.905741] 	do_vfs_ioctl+0x15e/0xd70
>[  706.905756] 	SyS_ioctl+0x79/0x90
>[  706.905770] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.905784] INFO: Object 0xffff8801b1c96dc0 @offset=11712
>[  706.905857] INFO: Allocated in __i915_vma_create+0xcb/0x4f0 [i915] age=37879 cpu=0 pid=1817
>[  706.905883] 	___slab_alloc+0x7eb/0xb40
>[  706.905897] 	__slab_alloc+0x51/0x90
>[  706.905911] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.905983] 	__i915_vma_create+0xcb/0x4f0 [i915]
>[  706.906056] 	i915_gem_obj_lookup_or_create_vma+0x36/0x40 [i915]
>[  706.906130] 	eb_lookup_vmas+0x4c0/0x800 [i915]
>[  706.906202] 	i915_gem_do_execbuffer.isra.8+0xb16/0x24a0 [i915]
>[  706.906275] 	i915_gem_execbuffer2+0x143/0x3c0 [i915]
>[  706.906312] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.906327] 	do_vfs_ioctl+0x15e/0xd70
>[  706.906342] 	SyS_ioctl+0x79/0x90
>[  706.906356] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.906370] INFO: Object 0xffff8801b1c97140 @offset=12608
>[  706.906469] INFO: Allocated in __i915_vma_create+0xcb/0x4f0 [i915] age=37939 cpu=2 pid=1815
>[  706.906496] 	___slab_alloc+0x7eb/0xb40
>[  706.906510] 	__slab_alloc+0x51/0x90
>[  706.906524] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.906595] 	__i915_vma_create+0xcb/0x4f0 [i915]
>[  706.906668] 	i915_vma_create+0xe/0x10 [i915]
>[  706.906739] 	i915_gem_create_context+0x5d3/0x8b0 [i915]
>[  706.906812] 	i915_gem_context_open+0x54/0xa0 [i915]
>[  706.906887] 	i915_gem_open+0x19c/0x260 [i915]
>[  706.906953] 	i915_driver_open+0xe/0x10 [i915]
>[  706.906991] 	drm_open+0x588/0xc00 [drm]
>[  706.907029] 	drm_stub_open+0x1ce/0x2b0 [drm]
>[  706.907044] 	chrdev_open+0x1da/0x370
>[  706.907059] 	do_dentry_open+0x38c/0x610
>[  706.907073] 	vfs_open+0xb8/0x170
>[  706.907087] 	path_openat+0xe77/0x1fc0
>[  706.907101] 	do_filp_open+0x137/0x200
>[  706.907474] kmem_cache_destroy i915_gem_vma: Slab cache still has objects
>[  706.907493] CPU: 0 PID: 1889 Comm: rmmod Tainted: G    BU  W       4.8.0-rc2-drm-intel-debug+ #21
>[  706.907519] Hardware name: ASUS All Series/Z87-K, BIOS 1202 05/13/2014
>[  706.907536]  ffffffff834deea0 000000005177c688 ffff8801b8e3fc18 ffffffff819588b5
>[  706.907566]  0000000041b58ab3 ffffffff829cb350 ffffffff819587e0 000000005177c688
>[  706.907596]  ffff8801d11ce140 ffff8801b8e3fc40 000000005177c688 ffff8801b8e3fc3f
>[  706.907625] Call Trace:
>[  706.907640]  [<ffffffff819588b5>] dump_stack+0xd5/0x150
>[  706.907657]  [<ffffffff819587e0>] ? _atomic_dec_and_lock+0xa0/0xa0
>[  706.907674]  [<ffffffff81230876>] ? trace_hardirqs_on_caller+0x16/0x3f0
>[  706.907693]  [<ffffffff81491f25>] kmem_cache_destroy+0x285/0x410
>[  706.907770]  [<ffffffffa035a633>] ? intel_runtime_pm_put+0xf3/0x1d0 [i915]
>[  706.907851]  [<ffffffffa03a95c2>] i915_gem_load_cleanup+0x42/0x80 [i915]
>[  706.907923]  [<ffffffffa031ca1d>] i915_driver_unload+0x1cd/0x260 [i915]
>[  706.907996]  [<ffffffffa032f8a1>] i915_pci_remove+0x31/0x50 [i915]
>[  706.908013]  [<ffffffff81a39f45>] pci_device_remove+0x75/0x170
>[  706.908030]  [<ffffffff81c4f5c5>] __device_release_driver+0xf5/0x220
>[  706.908047]  [<ffffffff81c50c9f>] driver_detach+0x14f/0x1b0
>[  706.908064]  [<ffffffff81c4e899>] bus_remove_driver+0xb9/0x1d0
>[  706.908081]  [<ffffffff81c523d3>] driver_unregister+0x43/0x70
>[  706.908097]  [<ffffffff81a36ef5>] pci_unregister_driver+0x25/0xe0
>[  706.908183]  [<ffffffffa04d0cf2>] i915_exit+0x1a/0xb0 [i915]
>[  706.908200]  [<ffffffff812c92fd>] SyS_delete_module+0x28d/0x3d0
>[  706.908216]  [<ffffffff812c9070>] ? free_module+0x680/0x680
>[  706.908232]  [<ffffffff8123075c>] ? mark_held_locks+0x2c/0x130
>[  706.908250]  [<ffffffff822e09e2>] ? entry_SYSCALL_64_fastpath+0x5/0xbd
>[  706.908267]  [<ffffffff812309ee>] ? trace_hardirqs_on_caller+0x18e/0x3f0
>[  706.908284]  [<ffffffff8100501a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
>[  706.908301]  [<ffffffff822e09fc>] entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.926504] =============================================================================
>[  706.926537] BUG i915_gem_object (Tainted: G    BU  W      ): Objects remaining in i915_gem_object on __kmem_cache_shutdown()
>[  706.926565] -----------------------------------------------------------------------------
>
>[  706.926603] INFO: Slab 0xffffea0005945000 objects=30 used=5 fp=0xffff880165143780 flags=0x5fff8000004080
>[  706.926632] CPU: 0 PID: 1889 Comm: rmmod Tainted: G    BU  W       4.8.0-rc2-drm-intel-debug+ #21
>[  706.926658] Hardware name: ASUS All Series/Z87-K, BIOS 1202 05/13/2014
>[  706.926674]  ffffea0005945000 000000005177c688 ffff8801b8e3fa78 ffffffff819588b5
>[  706.926705]  0000000041b58ab3 ffffffff829cb350 ffffffff819587e0 ffff8801b8e3fa20
>[  706.926734]  ffffffff00000010 ffff8801b8e3fa88 000000005177c688 000000005177c688
>[  706.926763] Call Trace:
>[  706.926781]  [<ffffffff819588b5>] dump_stack+0xd5/0x150
>[  706.926797]  [<ffffffff819587e0>] ? _atomic_dec_and_lock+0xa0/0xa0
>[  706.926816]  [<ffffffff81515f85>] slab_err+0xb5/0xf0
>[  706.926833]  [<ffffffff8152058c>] ? __kmalloc+0x1ac/0x670
>[  706.926850]  [<ffffffff81526017>] __kmem_cache_shutdown+0x1a7/0x670
>[  706.926868]  [<ffffffff81491684>] shutdown_cache+0x24/0xa0
>[  706.926885]  [<ffffffff81491f07>] kmem_cache_destroy+0x267/0x410
>[  706.926965]  [<ffffffffa035a633>] ? intel_runtime_pm_put+0xf3/0x1d0 [i915]
>[  706.927045]  [<ffffffffa03a95da>] i915_gem_load_cleanup+0x5a/0x80 [i915]
>[  706.927117]  [<ffffffffa031ca1d>] i915_driver_unload+0x1cd/0x260 [i915]
>[  706.927190]  [<ffffffffa032f8a1>] i915_pci_remove+0x31/0x50 [i915]
>[  706.927208]  [<ffffffff81a39f45>] pci_device_remove+0x75/0x170
>[  706.927226]  [<ffffffff81c4f5c5>] __device_release_driver+0xf5/0x220
>[  706.927243]  [<ffffffff81c50c9f>] driver_detach+0x14f/0x1b0
>[  706.927260]  [<ffffffff81c4e899>] bus_remove_driver+0xb9/0x1d0
>[  706.927277]  [<ffffffff81c523d3>] driver_unregister+0x43/0x70
>[  706.927293]  [<ffffffff81a36ef5>] pci_unregister_driver+0x25/0xe0
>[  706.927380]  [<ffffffffa04d0cf2>] i915_exit+0x1a/0xb0 [i915]
>[  706.927397]  [<ffffffff812c92fd>] SyS_delete_module+0x28d/0x3d0
>[  706.927414]  [<ffffffff812c9070>] ? free_module+0x680/0x680
>[  706.927431]  [<ffffffff8123075c>] ? mark_held_locks+0x2c/0x130
>[  706.927449]  [<ffffffff822e09e2>] ? entry_SYSCALL_64_fastpath+0x5/0xbd
>[  706.927466]  [<ffffffff812309ee>] ? trace_hardirqs_on_caller+0x18e/0x3f0
>[  706.927484]  [<ffffffff8100501a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
>[  706.927502]  [<ffffffff822e09fc>] entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.927523] INFO: Object 0xffff880165142f00 @offset=12032
>[  706.927602] INFO: Allocated in i915_gem_object_create+0x3e/0x4f0 [i915] age=37988 cpu=2 pid=1815
>[  706.927630] 	___slab_alloc+0x7eb/0xb40
>[  706.927645] 	__slab_alloc+0x51/0x90
>[  706.927661] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.927736] 	i915_gem_object_create+0x3e/0x4f0 [i915]
>[  706.927810] 	i915_gem_alloc_context_obj+0x3b/0x100 [i915]
>[  706.927885] 	i915_gem_create_context+0x5b7/0x8b0 [i915]
>[  706.927960] 	i915_gem_context_open+0x54/0xa0 [i915]
>[  706.928036] 	i915_gem_open+0x19c/0x260 [i915]
>[  706.928106] 	i915_driver_open+0xe/0x10 [i915]
>[  706.928148] 	drm_open+0x588/0xc00 [drm]
>[  706.928188] 	drm_stub_open+0x1ce/0x2b0 [drm]
>[  706.928205] 	chrdev_open+0x1da/0x370
>[  706.928220] 	do_dentry_open+0x38c/0x610
>[  706.928235] 	vfs_open+0xb8/0x170
>[  706.928249] 	path_openat+0xe77/0x1fc0
>[  706.928264] 	do_filp_open+0x137/0x200
>[  706.928278] INFO: Object 0xffff880165143bc0 @offset=15296
>[  706.928356] INFO: Allocated in i915_gem_object_create+0x3e/0x4f0 [i915] age=26626 cpu=2 pid=1815
>[  706.928383] 	___slab_alloc+0x7eb/0xb40
>[  706.928398] 	__slab_alloc+0x51/0x90
>[  706.928412] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.928488] 	i915_gem_object_create+0x3e/0x4f0 [i915]
>[  706.928566] 	i915_gem_create+0x89/0x120 [i915]
>[  706.928643] 	i915_gem_create_ioctl+0x3b/0x60 [i915]
>[  706.928683] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.928698] 	do_vfs_ioctl+0x15e/0xd70
>[  706.928713] 	SyS_ioctl+0x79/0x90
>[  706.928728] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.928742] INFO: Object 0xffff880165144000 @offset=16384
>[  706.928819] INFO: Allocated in i915_gem_object_create+0x3e/0x4f0 [i915] age=26603 cpu=0 pid=1815
>[  706.928848] 	___slab_alloc+0x7eb/0xb40
>[  706.928863] 	__slab_alloc+0x51/0x90
>[  706.928877] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.928953] 	i915_gem_object_create+0x3e/0x4f0 [i915]
>[  706.929030] 	i915_gem_create+0x89/0x120 [i915]
>[  706.929107] 	i915_gem_create_ioctl+0x3b/0x60 [i915]
>[  706.929148] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.929163] 	do_vfs_ioctl+0x15e/0xd70
>[  706.929178] 	SyS_ioctl+0x79/0x90
>[  706.929192] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.929207] INFO: Object 0xffff880165144440 @offset=17472
>[  706.929284] INFO: Allocated in i915_gem_object_create+0x3e/0x4f0 [i915] age=37903 cpu=0 pid=1817
>[  706.929311] 	___slab_alloc+0x7eb/0xb40
>[  706.929326] 	__slab_alloc+0x51/0x90
>[  706.929342] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.929417] 	i915_gem_object_create+0x3e/0x4f0 [i915]
>[  706.929494] 	i915_gem_create+0x89/0x120 [i915]
>[  706.929570] 	i915_gem_create_ioctl+0x3b/0x60 [i915]
>[  706.929610] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.929625] 	do_vfs_ioctl+0x15e/0xd70
>[  706.929640] 	SyS_ioctl+0x79/0x90
>[  706.929655] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.929669] INFO: Object 0xffff880165144880 @offset=18560
>[  706.929747] INFO: Allocated in i915_gem_object_create+0x3e/0x4f0 [i915] age=37963 cpu=2 pid=1815
>[  706.929774] 	___slab_alloc+0x7eb/0xb40
>[  706.929789] 	__slab_alloc+0x51/0x90
>[  706.929803] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.929879] 	i915_gem_object_create+0x3e/0x4f0 [i915]
>[  706.929954] 	i915_gem_alloc_context_obj+0x3b/0x100 [i915]
>[  706.930029] 	i915_gem_create_context+0x5b7/0x8b0 [i915]
>[  706.930104] 	i915_gem_context_open+0x54/0xa0 [i915]
>[  706.930183] 	i915_gem_open+0x19c/0x260 [i915]
>[  706.930251] 	i915_driver_open+0xe/0x10 [i915]
>[  706.930291] 	drm_open+0x588/0xc00 [drm]
>[  706.930333] 	drm_stub_open+0x1ce/0x2b0 [drm]
>[  706.930349] 	chrdev_open+0x1da/0x370
>[  706.930364] 	do_dentry_open+0x38c/0x610
>[  706.930378] 	vfs_open+0xb8/0x170
>[  706.930406] 	path_openat+0xe77/0x1fc0
>[  706.930422] 	do_filp_open+0x137/0x200
>[  706.930529] =============================================================================
>[  706.930556] BUG i915_gem_object (Tainted: G    BU  W      ): Objects remaining in i915_gem_object on __kmem_cache_shutdown()
>[  706.930583] -----------------------------------------------------------------------------
>
>[  706.930621] INFO: Slab 0xffffea00050b7600 objects=30 used=4 fp=0xffff880142dda680 flags=0x5fff8000004080
>[  706.930649] CPU: 0 PID: 1889 Comm: rmmod Tainted: G    BU  W       4.8.0-rc2-drm-intel-debug+ #21
>[  706.930676] Hardware name: ASUS All Series/Z87-K, BIOS 1202 05/13/2014
>[  706.930691]  ffffea00050b7600 000000005177c688 ffff8801b8e3fa78 ffffffff819588b5
>[  706.930721]  0000000041b58ab3 ffffffff829cb350 ffffffff819587e0 ffff8801b8e3fa20
>[  706.930750]  ffffffff00000010 ffff8801b8e3fa88 000000005177c688 000000005177c688
>[  706.930780] Call Trace:
>[  706.930795]  [<ffffffff819588b5>] dump_stack+0xd5/0x150
>[  706.930812]  [<ffffffff819587e0>] ? _atomic_dec_and_lock+0xa0/0xa0
>[  706.930831]  [<ffffffff81515f85>] slab_err+0xb5/0xf0
>[  706.930847]  [<ffffffff8152058c>] ? __kmalloc+0x1ac/0x670
>[  706.930864]  [<ffffffff81526017>] __kmem_cache_shutdown+0x1a7/0x670
>[  706.930881]  [<ffffffff81491684>] shutdown_cache+0x24/0xa0
>[  706.930898]  [<ffffffff81491f07>] kmem_cache_destroy+0x267/0x410
>[  706.930974]  [<ffffffffa035a633>] ? intel_runtime_pm_put+0xf3/0x1d0 [i915]
>[  706.931055]  [<ffffffffa03a95da>] i915_gem_load_cleanup+0x5a/0x80 [i915]
>[  706.931127]  [<ffffffffa031ca1d>] i915_driver_unload+0x1cd/0x260 [i915]
>[  706.931199]  [<ffffffffa032f8a1>] i915_pci_remove+0x31/0x50 [i915]
>[  706.931216]  [<ffffffff81a39f45>] pci_device_remove+0x75/0x170
>[  706.931233]  [<ffffffff81c4f5c5>] __device_release_driver+0xf5/0x220
>[  706.931250]  [<ffffffff81c50c9f>] driver_detach+0x14f/0x1b0
>[  706.931267]  [<ffffffff81c4e899>] bus_remove_driver+0xb9/0x1d0
>[  706.931284]  [<ffffffff81c523d3>] driver_unregister+0x43/0x70
>[  706.931300]  [<ffffffff81a36ef5>] pci_unregister_driver+0x25/0xe0
>[  706.931386]  [<ffffffffa04d0cf2>] i915_exit+0x1a/0xb0 [i915]
>[  706.931402]  [<ffffffff812c92fd>] SyS_delete_module+0x28d/0x3d0
>[  706.931421]  [<ffffffff812c9070>] ? free_module+0x680/0x680
>[  706.931437]  [<ffffffff8123075c>] ? mark_held_locks+0x2c/0x130
>[  706.931454]  [<ffffffff822e09e2>] ? entry_SYSCALL_64_fastpath+0x5/0xbd
>[  706.931471]  [<ffffffff812309ee>] ? trace_hardirqs_on_caller+0x18e/0x3f0
>[  706.931488]  [<ffffffff8100501a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
>[  706.931506]  [<ffffffff822e09fc>] entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.931523] INFO: Object 0xffff880142dd8040 @offset=64
>[  706.931601] INFO: Allocated in i915_gem_object_create+0x3e/0x4f0 [i915] age=26234 cpu=1 pid=1820
>[  706.931628] 	___slab_alloc+0x7eb/0xb40
>[  706.931643] 	__slab_alloc+0x51/0x90
>[  706.931657] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.931733] 	i915_gem_object_create+0x3e/0x4f0 [i915]
>[  706.931809] 	i915_gem_render_state_init+0x168/0xbe0 [i915]
>[  706.931889] 	intel_rcs_ctx_init+0x83/0x400 [i915]
>[  706.931963] 	do_rcs_switch+0xada/0x1820 [i915]
>[  706.932037] 	i915_switch_context+0xd9/0x6b0 [i915]
>[  706.932122] 	execbuf_submit+0x2c0/0xf2e [i915]
>[  706.932197] 	i915_gem_do_execbuffer.isra.8+0xf77/0x24a0 [i915]
>[  706.932272] 	i915_gem_execbuffer2+0x143/0x3c0 [i915]
>[  706.932311] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.932327] 	do_vfs_ioctl+0x15e/0xd70
>[  706.932342] 	SyS_ioctl+0x79/0x90
>[  706.932356] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.932373] INFO: Freed in qlist_free_all+0x5b/0x170 age=29959 cpu=1 pid=1817
>[  706.932390] 	__slab_free+0x1ff/0x2f0
>[  706.932404] 	___cache_free+0xe5/0x190
>[  706.932419] 	qlist_free_all+0x73/0x170
>[  706.932434] 	quarantine_reduce+0x1e2/0x350
>[  706.932450] 	kasan_kmalloc+0xca/0xe0
>[  706.932464] 	kasan_slab_alloc+0x12/0x20
>[  706.932479] 	kmem_cache_alloc+0x135/0x5e0
>[  706.932494] 	create_object+0xbb/0x5f0
>[  706.932510] 	kmemleak_alloc+0x4a/0xa0
>[  706.932524] 	__kmalloc+0x218/0x670
>[  706.932597] 	drm_malloc_gfp.constprop.9+0x39/0x70 [i915]
>[  706.932673] 	i915_gem_execbuffer2+0xb7/0x3c0 [i915]
>[  706.932712] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.932727] 	do_vfs_ioctl+0x15e/0xd70
>[  706.932742] 	SyS_ioctl+0x79/0x90
>[  706.932757] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.932771] INFO: Object 0xffff880142dd99c0 @offset=6592
>[  706.932849] INFO: Allocated in i915_gem_object_create+0x3e/0x4f0 [i915] age=26242 cpu=1 pid=1820
>[  706.932876] 	___slab_alloc+0x7eb/0xb40
>[  706.932891] 	__slab_alloc+0x51/0x90
>[  706.932905] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.932980] 	i915_gem_object_create+0x3e/0x4f0 [i915]
>[  706.933057] 	i915_gem_create+0x89/0x120 [i915]
>[  706.933132] 	i915_gem_create_ioctl+0x3b/0x60 [i915]
>[  706.933172] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.933189] 	do_vfs_ioctl+0x15e/0xd70
>[  706.933204] 	SyS_ioctl+0x79/0x90
>[  706.933218] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.933235] INFO: Freed in qlist_free_all+0x5b/0x170 age=29878 cpu=1 pid=1817
>[  706.933252] 	__slab_free+0x1ff/0x2f0
>[  706.933266] 	___cache_free+0xe5/0x190
>[  706.933281] 	qlist_free_all+0x73/0x170
>[  706.933298] 	quarantine_reduce+0x1e2/0x350
>[  706.933313] 	kasan_kmalloc+0xca/0xe0
>[  706.933328] 	kasan_slab_alloc+0x12/0x20
>[  706.933343] 	kmem_cache_alloc+0x135/0x5e0
>[  706.933358] 	create_object+0xbb/0x5f0
>[  706.933373] 	kmemleak_alloc+0x4a/0xa0
>[  706.933387] 	__kmalloc+0x218/0x670
>[  706.933460] 	drm_malloc_gfp.constprop.9+0x39/0x70 [i915]
>[  706.933534] 	i915_gem_execbuffer2+0xb7/0x3c0 [i915]
>[  706.933574] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.933589] 	do_vfs_ioctl+0x15e/0xd70
>[  706.933604] 	SyS_ioctl+0x79/0x90
>[  706.933618] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.933633] INFO: Object 0xffff880142ddc880 @offset=18560
>[  706.933712] INFO: Allocated in i915_gem_object_create+0x3e/0x4f0 [i915] age=26604 cpu=0 pid=1815
>[  706.933741] 	___slab_alloc+0x7eb/0xb40
>[  706.933755] 	__slab_alloc+0x51/0x90
>[  706.933770] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.933845] 	i915_gem_object_create+0x3e/0x4f0 [i915]
>[  706.933923] 	i915_gem_render_state_init+0x168/0xbe0 [i915]
>[  706.934002] 	intel_rcs_ctx_init+0x83/0x400 [i915]
>[  706.934077] 	do_rcs_switch+0xada/0x1820 [i915]
>[  706.934151] 	i915_switch_context+0xd9/0x6b0 [i915]
>[  706.934236] 	execbuf_submit+0x2c0/0xf2e [i915]
>[  706.934311] 	i915_gem_do_execbuffer.isra.8+0xf77/0x24a0 [i915]
>[  706.934400] 	i915_gem_execbuffer2+0x143/0x3c0 [i915]
>[  706.934440] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.934467] 	do_vfs_ioctl+0x15e/0xd70
>[  706.934482] 	SyS_ioctl+0x79/0x90
>[  706.934497] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.934513] INFO: Freed in qlist_free_all+0x5b/0x170 age=29781 cpu=1 pid=1817
>[  706.934530] 	__slab_free+0x1ff/0x2f0
>[  706.934544] 	___cache_free+0xe5/0x190
>[  706.934561] 	qlist_free_all+0x73/0x170
>[  706.934576] 	quarantine_reduce+0x1e2/0x350
>[  706.934591] 	kasan_kmalloc+0xca/0xe0
>[  706.934606] 	kasan_slab_alloc+0x12/0x20
>[  706.934620] 	kmem_cache_alloc+0x135/0x5e0
>[  706.934635] 	create_object+0xbb/0x5f0
>[  706.934650] 	kmemleak_alloc+0x4a/0xa0
>[  706.934667] 	__kmalloc+0x218/0x670
>[  706.934742] 	drm_malloc_gfp.constprop.9+0x39/0x70 [i915]
>[  706.934819] 	i915_gem_execbuffer2+0xb7/0x3c0 [i915]
>[  706.934858] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.934874] 	do_vfs_ioctl+0x15e/0xd70
>[  706.934889] 	SyS_ioctl+0x79/0x90
>[  706.934903] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.934919] INFO: Object 0xffff880142dde200 @offset=25088
>[  706.934997] INFO: Allocated in i915_gem_object_create+0x3e/0x4f0 [i915] age=26194 cpu=1 pid=1820
>[  706.935025] 	___slab_alloc+0x7eb/0xb40
>[  706.935040] 	__slab_alloc+0x51/0x90
>[  706.935054] 	kmem_cache_alloc+0x2ad/0x5e0
>[  706.935131] 	i915_gem_object_create+0x3e/0x4f0 [i915]
>[  706.935211] 	i915_gem_create+0x89/0x120 [i915]
>[  706.935290] 	i915_gem_create_ioctl+0x3b/0x60 [i915]
>[  706.935330] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.935345] 	do_vfs_ioctl+0x15e/0xd70
>[  706.935360] 	SyS_ioctl+0x79/0x90
>[  706.935375] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.935391] INFO: Freed in qlist_free_all+0x5b/0x170 age=29963 cpu=1 pid=1817
>[  706.935408] 	__slab_free+0x1ff/0x2f0
>[  706.935422] 	___cache_free+0xe5/0x190
>[  706.935437] 	qlist_free_all+0x73/0x170
>[  706.935452] 	quarantine_reduce+0x1e2/0x350
>[  706.935467] 	kasan_kmalloc+0xca/0xe0
>[  706.935482] 	kasan_slab_alloc+0x12/0x20
>[  706.935497] 	kmem_cache_alloc+0x135/0x5e0
>[  706.935512] 	create_object+0xbb/0x5f0
>[  706.935527] 	kmemleak_alloc+0x4a/0xa0
>[  706.935541] 	__kmalloc+0x218/0x670
>[  706.935616] 	drm_malloc_gfp.constprop.9+0x39/0x70 [i915]
>[  706.935690] 	i915_gem_execbuffer2+0xb7/0x3c0 [i915]
>[  706.935730] 	drm_ioctl+0x441/0x8a0 [drm]
>[  706.935745] 	do_vfs_ioctl+0x15e/0xd70
>[  706.935760] 	SyS_ioctl+0x79/0x90
>[  706.935775] 	entry_SYSCALL_64_fastpath+0x1f/0xbd
>[  706.936136] kmem_cache_destroy i915_gem_object: Slab cache still has objects
>[  706.936155] CPU: 0 PID: 1889 Comm: rmmod Tainted: G    BU  W       4.8.0-rc2-drm-intel-debug+ #21
>[  706.936182] Hardware name: ASUS All Series/Z87-K, BIOS 1202 05/13/2014
>[  706.936199]  ffffffff834deea0 000000005177c688 ffff8801b8e3fc18 ffffffff819588b5
>[  706.936229]  0000000041b58ab3 ffffffff829cb350 ffffffff819587e0 000000005177c688
>[  706.936258]  ffff8801d11cdbc0 ffff8801b8e3fc40 000000005177c688 ffff8801b8e3fc3f
>[  706.936289] Call Trace:
>[  706.936304]  [<ffffffff819588b5>] dump_stack+0xd5/0x150
>[  706.936321]  [<ffffffff819587e0>] ? _atomic_dec_and_lock+0xa0/0xa0
>[  706.936338]  [<ffffffff81230876>] ? trace_hardirqs_on_caller+0x16/0x3f0
>[  706.936355]  [<ffffffff81491f25>] kmem_cache_destroy+0x285/0x410
>[  706.936431]  [<ffffffffa035a633>] ? intel_runtime_pm_put+0xf3/0x1d0 [i915]
>[  706.936511]  [<ffffffffa03a95da>] i915_gem_load_cleanup+0x5a/0x80 [i915]
>[  706.936583]  [<ffffffffa031ca1d>] i915_driver_unload+0x1cd/0x260 [i915]
>[  706.936657]  [<ffffffffa032f8a1>] i915_pci_remove+0x31/0x50 [i915]
>[  706.936676]  [<ffffffff81a39f45>] pci_device_remove+0x75/0x170
>[  706.936693]  [<ffffffff81c4f5c5>] __device_release_driver+0xf5/0x220
>[  706.936710]  [<ffffffff81c50c9f>] driver_detach+0x14f/0x1b0
>[  706.936727]  [<ffffffff81c4e899>] bus_remove_driver+0xb9/0x1d0
>[  706.936743]  [<ffffffff81c523d3>] driver_unregister+0x43/0x70
>[  706.936760]  [<ffffffff81a36ef5>] pci_unregister_driver+0x25/0xe0
>[  706.936847]  [<ffffffffa04d0cf2>] i915_exit+0x1a/0xb0 [i915]
>[  706.936864]  [<ffffffff812c92fd>] SyS_delete_module+0x28d/0x3d0
>[  706.936880]  [<ffffffff812c9070>] ? free_module+0x680/0x680
>[  706.936897]  [<ffffffff8123075c>] ? mark_held_locks+0x2c/0x130
>[  706.936914]  [<ffffffff822e09e2>] ? entry_SYSCALL_64_fastpath+0x5/0xbd
>[  706.936931]  [<ffffffff812309ee>] ? trace_hardirqs_on_caller+0x18e/0x3f0
>[  706.936948]  [<ffffffff8100501a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
>[  706.936966]  [<ffffffff822e09fc>] entry_SYSCALL_64_fastpath+0x1f/0xbd

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