BWR: igt@gem_ctx_isolation@preservation-reset@rcs0 - incomplete - BUG debug_objects_cache (Not tainted): Poison overwritten
https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_537/fi-bwr-2160/igt@gem_ctx_isolation@preservation-reset@rcs0.html#dmesg-warnings219
<7> [233.563002] [drm:drm_helper_hpd_irq_event] [CONNECTOR:49:VGA-1] status updated from disconnected to disconnected
<7> [233.563009] [drm:drm_helper_hpd_irq_event] [CONNECTOR:49:VGA-1] New epoch counter 47
<7> [233.563018] [drm:drm_helper_hpd_irq_event] [CONNECTOR:52:DVI-D-1] Old epoch counter 1
<7> [233.563140] [drm:intel_sdvo_detect [i915]] [CONNECTOR:52:DVI-D-1]
<7> [233.563426] [drm:__intel_sdvo_write_cmd [i915]] SDVOB: W: 0B (GET_ATTACHED_DISPLAYS)
<7> [233.569716] [drm:intel_sdvo_read_response [i915]] SDVOB: R: (Success) 01 00
<7> [233.569831] [drm:intel_sdvo_detect [i915]] SDVO response 1 0 [1]
<7> [233.569982] [drm:__intel_sdvo_write_cmd [i915]] SDVOB: W: 7A 02 (SET_CONTROL_BUS_SWITCH)
<7> [233.577713] [drm:__intel_sdvo_write_cmd [i915]] SDVOB: W: 7A 02 (SET_CONTROL_BUS_SWITCH)
<7> [233.631190] [drm:drm_add_display_info] Supported Monitor Refresh rate range is 0 Hz - 0 Hz
<7> [233.631199] [drm:drm_add_display_info] non_desktop set to 0
<7> [233.631266] [drm:drm_helper_hpd_irq_event] [CONNECTOR:52:DVI-D-1] status updated from connected to connected
<7> [233.631273] [drm:drm_helper_hpd_irq_event] [CONNECTOR:52:DVI-D-1] New epoch counter 1
<3> [233.642260] =============================================================================
<3> [233.642401] BUG debug_objects_cache (Not tainted): Poison overwritten
<3> [233.642454] -----------------------------------------------------------------------------
<4> [233.642528] Disabling lock debugging due to kernel taint
<3> [233.642532] INFO: 0x00000000d81009bc-0x00000000217b100b @offset=4912. First byte 0x0 instead of 0x6b
<3> [233.642559] INFO: Allocated in fill_pool+0x19b/0x250 age=7085 cpu=0 pid=1038
<3> [233.642577] __slab_alloc.isra.88.constprop.93+0x3d/0x70
<3> [233.642590] kmem_cache_alloc+0x25c/0x2c0
<3> [233.642601] fill_pool+0x19b/0x250
<3> [233.642611] __debug_object_init+0x2e/0x500
<3> [233.642622] debug_object_activate+0x1dc/0x240
<3> [233.642635] kfree_call_rcu+0x49/0x220
<3> [233.642882] i915_driver_postclose+0x37/0x50 [i915]
<3> [233.642898] drm_file_free.part.13+0x240/0x290
<3> [233.642910] drm_release_noglobal+0x16/0x50
<3> [233.642921] __fput+0xf4/0x260
<3> [233.642931] task_work_run+0x6e/0xb0
<3> [233.642942] __prepare_exit_to_usermode+0xd2/0x1a0
<3> [233.642955] do_syscall_64+0x62/0xe0
<3> [233.642968] entry_SYSCALL_64_after_hwframe+0x44/0xa9
<3> [233.642982] INFO: Freed in free_obj_work+0x1d2/0x220 age=5838 cpu=1 pid=22
<3> [233.642999] kmem_cache_free+0x251/0x3d0
<3> [233.643010] free_obj_work+0x1d2/0x220
<3> [233.643021] process_one_work+0x268/0x600
<3> [233.643032] worker_thread+0x37/0x370
<3> [233.643043] kthread+0x14d/0x170
<3> [233.643052] ret_from_fork+0x22/0x30
<3> [233.643063] INFO: Slab 0x00000000d227f054 objects=21 used=0 fp=0x000000000d8d7258 flags=0x4000000000010200
<3> [233.643124] INFO: Object 0x00000000adabe756 @offset=4896 fp=0x000000009b3933e9
<3> [233.643145] Redzone 00000000: bb bb bb bb bb bb bb bb ........
<3> [233.643163] Object 00000000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
<3> [233.643183] Object 00000010: 00 00 00 00 00 00 00 00 6b 6b 6b 6b 6b 6b 6b 6b ........kkkkkkkk
<3> [233.643202] Object 00000020: 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkk.
<3> [233.643219] Redzone 00000000: bb bb bb bb bb bb bb bb ........
<3> [233.643238] Padding 00000000: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
<4> [233.643258] CPU: 1 PID: 22 Comm: kworker/1:1 Tainted: G B 5.8.0-rc4-gf88955370bca7-drmtip_537+ #1
<4> [233.643260] Hardware name: Dell Inc. OptiPlex 745 /0GW726, BIOS 2.3.1 05/21/2007
<4> [233.643265] Workqueue: events free_obj_work
<4> [233.643268] Call Trace:
<4> [233.643275] dump_stack+0x78/0xab
<4> [233.643279] check_bytes_and_report+0xe5/0x120
<4> [233.643284] check_object+0x22c/0x270
<4> [233.643289] __free_slab+0xb0/0x590
<4> [233.643294] ? free_obj_work+0x1d2/0x220
<4> [233.643297] kmem_cache_free+0x251/0x3d0
<4> [233.643302] free_obj_work+0x1d2/0x220
<4> [233.643306] process_one_work+0x268/0x600
<4> [233.643310] ? __schedule+0x300/0x8e0
<4> [233.643317] worker_thread+0x37/0x370
<4> [233.643321] ? process_one_work+0x600/0x600
<4> [233.643324] kthread+0x14d/0x170
<4> [233.643327] ? kthread_park+0x80/0x80
<4> [233.643331] ret_from_fork+0x22/0x30
<3> [233.643341] FIX debug_objects_cache: Restoring 0x00000000d81009bc-0x00000000217b100b=0x6b
<6> [233.695036] Console: switching to colour frame buffer device 240x67
<7> [233.727261] i915 0000:00:02.0: [drm:drm_fb_helper_hotplug_event.part.18]
````