[  180.631142] ==================================================================
[  180.631852] BUG: KASAN: slab-use-after-free in drm_encoder_cleanup+0x265/0x270
[  180.632619] Read of size 8 at addr ffff88810713e870 by task kunit_try_catch/1678
[  180.633360] 
[  180.633555] CPU: 0 UID: 0 PID: 1678 Comm: kunit_try_catch Tainted: G    B D W        N  6.16.0-rc3-next-20250626 #1 PREEMPT(voluntary) 
[  180.633606] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN, [N]=TEST
[  180.633619] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[  180.633639] Call Trace:
[  180.633655]  <TASK>
[  180.633693]  dump_stack_lvl+0x73/0xb0
[  180.633729]  print_report+0xd1/0x650
[  180.633767]  ? __virt_addr_valid+0x1db/0x2d0
[  180.633793]  ? drm_encoder_cleanup+0x265/0x270
[  180.633818]  ? kasan_complete_mode_report_info+0x64/0x200
[  180.633841]  ? drm_encoder_cleanup+0x265/0x270
[  180.633865]  kasan_report+0x141/0x180
[  180.633887]  ? drm_encoder_cleanup+0x265/0x270
[  180.633914]  __asan_report_load8_noabort+0x18/0x20
[  180.633938]  drm_encoder_cleanup+0x265/0x270
[  180.633963]  drmm_encoder_alloc_release+0x36/0x60
[  180.633987]  drm_managed_release+0x15c/0x470
[  180.634007]  ? simple_release_fs+0x86/0xb0
[  180.634034]  drm_dev_put.part.0+0xa1/0x100
[  180.634052]  ? __pfx_devm_drm_dev_init_release+0x10/0x10
[  180.634073]  devm_drm_dev_init_release+0x17/0x30
[  180.634093]  devm_action_release+0x50/0x80
[  180.634119]  devres_release_all+0x186/0x240
[  180.634151]  ? __pfx_devres_release_all+0x10/0x10
[  180.634169]  ? kernfs_remove_by_name_ns+0x166/0x1d0
[  180.634194]  ? sysfs_remove_file_ns+0x56/0xa0
[  180.634218]  device_unbind_cleanup+0x1b/0x1b0
[  180.634242]  device_release_driver_internal+0x3e4/0x540
[  180.634265]  ? klist_devices_put+0x35/0x50
[  180.634287]  device_release_driver+0x16/0x20
[  180.634309]  bus_remove_device+0x1e9/0x3d0
[  180.634333]  device_del+0x397/0x980
[  180.634358]  ? __pfx_device_del+0x10/0x10
[  180.634379]  ? __kasan_check_write+0x18/0x20
[  180.634401]  ? _raw_spin_lock_irqsave+0xa1/0x100
[  180.634432]  ? __pfx_device_unregister_wrapper+0x10/0x10
[  180.634457]  device_unregister+0x1b/0xa0
[  180.634478]  device_unregister_wrapper+0x12/0x20
[  180.634499]  __kunit_action_free+0x57/0x70
[  180.634523]  kunit_remove_resource+0x133/0x200
[  180.634544]  ? preempt_count_sub+0x50/0x80
[  180.634568]  kunit_cleanup+0x7a/0x120
[  180.634592]  kunit_try_run_case_cleanup+0xbd/0xf0
[  180.634615]  ? __pfx_kunit_try_run_case_cleanup+0x10/0x10
[  180.634637]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[  180.634659]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[  180.634680]  kthread+0x337/0x6f0
[  180.634702]  ? trace_preempt_on+0x20/0xc0
[  180.634727]  ? __pfx_kthread+0x10/0x10
[  180.634747]  ? _raw_spin_unlock_irq+0x47/0x80
[  180.634773]  ? calculate_sigpending+0x7b/0xa0
[  180.634797]  ? __pfx_kthread+0x10/0x10
[  180.634818]  ret_from_fork+0x116/0x1d0
[  180.634839]  ? __pfx_kthread+0x10/0x10
[  180.634859]  ret_from_fork_asm+0x1a/0x30
[  180.634892]  </TASK>
[  180.634905] 
[  180.650797] Allocated by task 1677:
[  180.651235]  kasan_save_stack+0x45/0x70
[  180.651685]  kasan_save_track+0x18/0x40
[  180.652309]  kasan_save_alloc_info+0x3b/0x50
[  180.652801]  __kasan_kmalloc+0xb7/0xc0
[  180.653023]  __kmalloc_noprof+0x1c9/0x500
[  180.653298]  __devm_drm_bridge_alloc+0x33/0x170
[  180.653798]  drm_test_bridge_init+0x188/0x5c0
[  180.654113]  drm_test_drm_bridge_get_current_state_atomic+0xea/0x870
[  180.654317]  kunit_try_run_case+0x1a5/0x480
[  180.654460]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[  180.654629]  kthread+0x337/0x6f0
[  180.654746]  ret_from_fork+0x116/0x1d0
[  180.654873]  ret_from_fork_asm+0x1a/0x30
[  180.655204] 
[  180.655374] Freed by task 1678:
[  180.655661]  kasan_save_stack+0x45/0x70
[  180.656016]  kasan_save_track+0x18/0x40
[  180.656432]  kasan_save_free_info+0x3f/0x60
[  180.656877]  __kasan_slab_free+0x56/0x70
[  180.657279]  kfree+0x222/0x3f0
[  180.657567]  drm_bridge_put.part.0+0xc7/0x100
[  180.658004]  drm_bridge_put_void+0x17/0x30
[  180.658382]  devm_action_release+0x50/0x80
[  180.658754]  devres_release_all+0x186/0x240
[  180.659158]  device_unbind_cleanup+0x1b/0x1b0
[  180.659763]  device_release_driver_internal+0x3e4/0x540
[  180.660181]  device_release_driver+0x16/0x20
[  180.660463]  bus_remove_device+0x1e9/0x3d0
[  180.660939]  device_del+0x397/0x980
[  180.661190]  device_unregister+0x1b/0xa0
[  180.661476]  device_unregister_wrapper+0x12/0x20
[  180.662011]  __kunit_action_free+0x57/0x70
[  180.662344]  kunit_remove_resource+0x133/0x200
[  180.662781]  kunit_cleanup+0x7a/0x120
[  180.663083]  kunit_try_run_case_cleanup+0xbd/0xf0
[  180.663253]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[  180.663423]  kthread+0x337/0x6f0
[  180.663539]  ret_from_fork+0x116/0x1d0
[  180.663666]  ret_from_fork_asm+0x1a/0x30
[  180.663800] 
[  180.663872] The buggy address belongs to the object at ffff88810713e800
[  180.663872]  which belongs to the cache kmalloc-512 of size 512
[  180.664273] The buggy address is located 112 bytes inside of
[  180.664273]  freed 512-byte region [ffff88810713e800, ffff88810713ea00)
[  180.664898] 
[  180.665083] The buggy address belongs to the physical page:
[  180.665341] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10713c
[  180.665625] head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[  180.665980] flags: 0x200000000000040(head|node=0|zone=2)
[  180.666223] page_type: f5(slab)
[  180.666349] raw: 0200000000000040 ffff888100041c80 dead000000000122 0000000000000000
[  180.666702] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[  180.667292] head: 0200000000000040 ffff888100041c80 dead000000000122 0000000000000000
[  180.667566] head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[  180.667859] head: 0200000000000002 ffffea00041c4f01 00000000ffffffff 00000000ffffffff
[  180.668545] head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
[  180.668848] page dumped because: kasan: bad access detected
[  180.669521] 
[  180.669615] Memory state around the buggy address:
[  180.670176]  ffff88810713e700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[  180.670896]  ffff88810713e780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[  180.671456] >ffff88810713e800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  180.671929]                                                              ^
[  180.672230]  ffff88810713e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  180.672503]  ffff88810713e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  180.672782] ==================================================================