igt@i915_module_load@reload|igt@i915_selftest@mock - incomplete - BUG i915_request (Tainted: .*): Objects remaining in i915_request on __kmem_cache_shutdown()

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_5495/shard-tglb3/igt@i915_module_load@reload.html

<3> [220.427784] =============================================================================
<3> [220.428126] BUG i915_request (Tainted: G     U           ): Objects remaining in i915_request on __kmem_cache_shutdown()
<3> [220.428165] -----------------------------------------------------------------------------
<4> [220.428199] Disabling lock debugging due to kernel taint
<3> [220.428202] INFO: Slab 0x000000002a983639 objects=30 used=1 fp=0x000000002fce1e83 flags=0x8000000000010200
<4> [220.428217] CPU: 6 PID: 2319 Comm: i915_module_loa Tainted: G    BU            5.6.0-rc4-CI-CI_DRM_8069+ #1
<4> [220.428218] Hardware name: Intel Corporation Tiger Lake Client Platform/TigerLake U DDR4 SODIMM RVP, BIOS TGLSFWI1.R00.2457.A16.1912270059 12/27/2019
<4> [220.428220] Call Trace:
<4> [220.428225]  dump_stack+0x71/0x9b
<4> [220.428230]  slab_err+0xa8/0xd0
<4> [220.428240]  ? __kmem_cache_shutdown+0x6e/0x3d0
<4> [220.428243]  ? ksm_migrate_page+0x160/0x160
<4> [220.428246]  __kmem_cache_shutdown+0x1fd/0x3d0
<4> [220.428251]  ? kmem_cache_destroy+0x8a/0x2b0
<4> [220.428255]  shutdown_cache+0x10/0x1b0
<4> [220.428258]  kmem_cache_destroy+0x29c/0x2b0
<4> [220.428342]  i915_globals_exit+0xa3/0xf7 [i915]
<4> [220.428345]  __x64_sys_delete_module+0x115/0x1e0
<4> [220.428349]  ? trace_hardirqs_off_thunk+0x1a/0x1c
<4> [220.428351]  ? do_syscall_64+0xd/0x220
<4> [220.428353]  do_syscall_64+0x4f/0x220
<4> [220.428357]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [220.428359] RIP: 0033:0x7fcf4a82d1b7
<4> [220.428362] Code: 73 01 c3 48 8b 0d d1 8c 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 8c 2c 00 f7 d8 64 89 01 48
<4> [220.428364] RSP: 002b:00007ffcb15de618 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
<4> [220.428366] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcf4a82d1b7
<4> [220.428367] RDX: 0000000000000001 RSI: 0000000000000800 RDI: 000056105ba12e38
<4> [220.428368] RBP: 000056105ba12dd0 R08: 000056105ba12e3c R09: 00007ffcb15de640
<4> [220.428370] R10: 00007ffcb15dd614 R11: 0000000000000206 R12: 0000000000000000
<4> [220.428371] R13: 00007ffcb15de7c0 R14: 0000000000000000 R15: 0000000000000000
<3> [220.428380] INFO: Object 0x00000000bef646b8 @offset=15296
<3> [220.428454] INFO: Allocated in __i915_request_create+0x5c/0x600 [i915] age=181528 cpu=4 pid=1147
<3> [220.428467] 	__slab_alloc.isra.89.constprop.94+0x3d/0x70
<3> [220.428476] 	kmem_cache_alloc+0x25f/0x2c0
<3> [220.428548] 	__i915_request_create+0x5c/0x600 [i915]
<3> [220.428615] 	i915_request_create+0x8c/0x1d0 [i915]
<3> [220.428677] 	i915_gem_do_execbuffer+0x9e6/0x2680 [i915]
<3> [220.428737] 	i915_gem_execbuffer2_ioctl+0x123/0x470 [i915]
<3> [220.428747] 	drm_ioctl_kernel+0xad/0xf0
<3> [220.428753] 	drm_ioctl+0x2e1/0x390
<3> [220.428760] 	ksys_ioctl+0x7b/0x90
<3> [220.428766] 	__x64_sys_ioctl+0x11/0x20
<3> [220.428773] 	do_syscall_64+0x4f/0x220
<3> [220.428780] 	entry_SYSCALL_64_after_hwframe+0x49/0xbe
<3> [220.428844] INFO: Freed in i915_request_retire+0x4ee/0x970 [i915] age=181528 cpu=0 pid=199
<3> [220.428856] 	kmem_cache_free+0x254/0x3d0
<3> [220.428918] 	i915_request_retire+0x4ee/0x970 [i915]
<3> [220.428971] 	retire_requests+0x4f/0x70 [i915]
<3> [220.429023] 	engine_retire+0x69/0xf0 [i915]
<3> [220.429031] 	process_one_work+0x260/0x600
<3> [220.429037] 	worker_thread+0x37/0x380
<3> [220.429043] 	kthread+0x119/0x130
<3> [220.429049] 	ret_from_fork+0x24/0x50
<3> [220.429089] kmem_cache_destroy i915_request: Slab cache still has objects
<4> [220.429103] CPU: 6 PID: 2319 Comm: i915_module_loa Tainted: G    BU            5.6.0-rc4-CI-CI_DRM_8069+ #1
<4> [220.429105] Hardware name: Intel Corporation Tiger Lake Client Platform/TigerLake U DDR4 SODIMM RVP, BIOS TGLSFWI1.R00.2457.A16.1912270059 12/27/2019
<4> [220.429106] Call Trace:
<4> [220.429109]  dump_stack+0x71/0x9b
<4> [220.429112]  kmem_cache_destroy+0x245/0x2b0
<4> [220.429176]  i915_globals_exit+0xa3/0xf7 [i915]
<4> [220.429181]  __x64_sys_delete_module+0x115/0x1e0
<4> [220.429184]  ? trace_hardirqs_off_thunk+0x1a/0x1c
<4> [220.429186]  ? do_syscall_64+0xd/0x220
<4> [220.429190]  do_syscall_64+0x4f/0x220
<4> [220.429194]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [220.429198] RIP: 0033:0x7fcf4a82d1b7
<4> [220.429202] Code: 73 01 c3 48 8b 0d d1 8c 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 8c 2c 00 f7 d8 64 89 01 48
<4> [220.429206] RSP: 002b:00007ffcb15de618 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
<4> [220.429211] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcf4a82d1b7
<4> [220.429214] RDX: 0000000000000001 RSI: 0000000000000800 RDI: 000056105ba12e38
<4> [220.429217] RBP: 000056105ba12dd0 R08: 000056105ba12e3c R09: 00007ffcb15de640
<4> [220.429221] R10: 00007ffcb15dd614 R11: 0000000000000206 R12: 0000000000000000
<4> [220.429224] R13: 00007ffcb15de7c0 R14: 0000000000000000 R15: 0000000000000000