[  176.896720] ==================================================================
[  176.897498] BUG: KASAN: slab-use-after-free in drm_encoder_cleanup+0x265/0x270
[  176.898263] Read of size 8 at addr ffff88810336bc70 by task kunit_try_catch/1678
[  176.899029] 
[  176.899184] CPU: 1 UID: 0 PID: 1678 Comm: kunit_try_catch Tainted: G    B D W        N  6.16.0-rc3-next-20250625 #1 PREEMPT(voluntary) 
[  176.899234] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN, [N]=TEST
[  176.899248] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[  176.899265] Call Trace:
[  176.899280]  <TASK>
[  176.899301]  dump_stack_lvl+0x73/0xb0
[  176.899332]  print_report+0xd1/0x650
[  176.899357]  ? __virt_addr_valid+0x1db/0x2d0
[  176.899381]  ? drm_encoder_cleanup+0x265/0x270
[  176.899404]  ? kasan_complete_mode_report_info+0x64/0x200
[  176.899427]  ? drm_encoder_cleanup+0x265/0x270
[  176.899449]  kasan_report+0x141/0x180
[  176.899470]  ? drm_encoder_cleanup+0x265/0x270
[  176.899496]  __asan_report_load8_noabort+0x18/0x20
[  176.899519]  drm_encoder_cleanup+0x265/0x270
[  176.899542]  drmm_encoder_alloc_release+0x36/0x60
[  176.899561]  drm_managed_release+0x15c/0x470
[  176.899580]  ? simple_release_fs+0x86/0xb0
[  176.899605]  drm_dev_put.part.0+0xa1/0x100
[  176.899625]  ? __pfx_devm_drm_dev_init_release+0x10/0x10
[  176.899644]  devm_drm_dev_init_release+0x17/0x30
[  176.899663]  devm_action_release+0x50/0x80
[  176.899690]  devres_release_all+0x186/0x240
[  176.899710]  ? __pfx_devres_release_all+0x10/0x10
[  176.899729]  ? kernfs_remove_by_name_ns+0x166/0x1d0
[  176.899753]  ? sysfs_remove_file_ns+0x56/0xa0
[  176.899775]  device_unbind_cleanup+0x1b/0x1b0
[  176.899798]  device_release_driver_internal+0x3e4/0x540
[  176.899820]  ? klist_devices_put+0x35/0x50
[  176.899842]  device_release_driver+0x16/0x20
[  176.899863]  bus_remove_device+0x1e9/0x3d0
[  176.899887]  device_del+0x397/0x980
[  176.899925]  ? __pfx_device_del+0x10/0x10
[  176.899946]  ? __kasan_check_write+0x18/0x20
[  176.899966]  ? _raw_spin_lock_irqsave+0xa1/0x100
[  176.899987]  ? __pfx_device_unregister_wrapper+0x10/0x10
[  176.900013]  device_unregister+0x1b/0xa0
[  176.900034]  device_unregister_wrapper+0x12/0x20
[  176.900054]  __kunit_action_free+0x57/0x70
[  176.900078]  kunit_remove_resource+0x133/0x200
[  176.900125]  ? preempt_count_sub+0x50/0x80
[  176.900158]  kunit_cleanup+0x7a/0x120
[  176.900183]  kunit_try_run_case_cleanup+0xbd/0xf0
[  176.900205]  ? __pfx_kunit_try_run_case_cleanup+0x10/0x10
[  176.900226]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[  176.900248]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[  176.900268]  kthread+0x337/0x6f0
[  176.900440]  ? trace_preempt_on+0x20/0xc0
[  176.900469]  ? __pfx_kthread+0x10/0x10
[  176.900489]  ? _raw_spin_unlock_irq+0x47/0x80
[  176.900512]  ? calculate_sigpending+0x7b/0xa0
[  176.900535]  ? __pfx_kthread+0x10/0x10
[  176.900555]  ret_from_fork+0x116/0x1d0
[  176.900574]  ? __pfx_kthread+0x10/0x10
[  176.900594]  ret_from_fork_asm+0x1a/0x30
[  176.900624]  </TASK>
[  176.900636] 
[  176.915078] Allocated by task 1677:
[  176.915458]  kasan_save_stack+0x45/0x70
[  176.915666]  kasan_save_track+0x18/0x40
[  176.916090]  kasan_save_alloc_info+0x3b/0x50
[  176.916300]  __kasan_kmalloc+0xb7/0xc0
[  176.916564]  __kmalloc_noprof+0x1c9/0x500
[  176.916873]  __devm_drm_bridge_alloc+0x33/0x170
[  176.917177]  drm_test_bridge_init+0x188/0x5c0
[  176.917391]  drm_test_drm_bridge_get_current_state_atomic+0xea/0x870
[  176.917814]  kunit_try_run_case+0x1a5/0x480
[  176.918267]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[  176.918728]  kthread+0x337/0x6f0
[  176.918865]  ret_from_fork+0x116/0x1d0
[  176.919380]  ret_from_fork_asm+0x1a/0x30
[  176.919525] 
[  176.919617] Freed by task 1678:
[  176.919775]  kasan_save_stack+0x45/0x70
[  176.920304]  kasan_save_track+0x18/0x40
[  176.920600]  kasan_save_free_info+0x3f/0x60
[  176.920967]  __kasan_slab_free+0x56/0x70
[  176.921289]  kfree+0x222/0x3f0
[  176.921553]  drm_bridge_put.part.0+0xc7/0x100
[  176.921959]  drm_bridge_put_void+0x17/0x30
[  176.922251]  devm_action_release+0x50/0x80
[  176.922543]  devres_release_all+0x186/0x240
[  176.922730]  device_unbind_cleanup+0x1b/0x1b0
[  176.922955]  device_release_driver_internal+0x3e4/0x540
[  176.923306]  device_release_driver+0x16/0x20
[  176.923520]  bus_remove_device+0x1e9/0x3d0
[  176.923708]  device_del+0x397/0x980
[  176.923835]  device_unregister+0x1b/0xa0
[  176.924084]  device_unregister_wrapper+0x12/0x20
[  176.924492]  __kunit_action_free+0x57/0x70
[  176.924653]  kunit_remove_resource+0x133/0x200
[  176.924984]  kunit_cleanup+0x7a/0x120
[  176.925268]  kunit_try_run_case_cleanup+0xbd/0xf0
[  176.925510]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[  176.925746]  kthread+0x337/0x6f0
[  176.925987]  ret_from_fork+0x116/0x1d0
[  176.926214]  ret_from_fork_asm+0x1a/0x30
[  176.926424] 
[  176.926532] The buggy address belongs to the object at ffff88810336bc00
[  176.926532]  which belongs to the cache kmalloc-512 of size 512
[  176.927133] The buggy address is located 112 bytes inside of
[  176.927133]  freed 512-byte region [ffff88810336bc00, ffff88810336be00)
[  176.927637] 
[  176.927730] The buggy address belongs to the physical page:
[  176.928038] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103368
[  176.928560] head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[  176.929102] flags: 0x200000000000040(head|node=0|zone=2)
[  176.929482] page_type: f5(slab)
[  176.929706] raw: 0200000000000040 ffff888100041c80 dead000000000122 0000000000000000
[  176.930079] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
[  176.930567] head: 0200000000000040 ffff888100041c80 dead000000000122 0000000000000000
[  176.930923] head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
[  176.931437] head: 0200000000000002 ffffea00040cda01 00000000ffffffff 00000000ffffffff
[  176.931781] head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
[  176.932256] page dumped because: kasan: bad access detected
[  176.932515] 
[  176.932594] Memory state around the buggy address:
[  176.932809]  ffff88810336bb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[  176.933168]  ffff88810336bb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[  176.933444] >ffff88810336bc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  176.933802]                                                              ^
[  176.934059]  ffff88810336bc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  176.934379]  ffff88810336bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  176.934712] ==================================================================