[  146.061522] ==================================================================
[  146.062389] BUG: KASAN: slab-use-after-free in drm_encoder_cleanup+0x265/0x270
[  146.063042] Read of size 8 at addr ffff88810a109c70 by task kunit_try_catch/1605
[  146.063615] 
[  146.063720] CPU: 0 UID: 0 PID: 1605 Comm: kunit_try_catch Tainted: G    B D W        N  6.16.0-rc2-next-20250618 #1 PREEMPT(voluntary) 
[  146.063767] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN, [N]=TEST
[  146.063780] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[  146.063798] Call Trace:
[  146.063812]  <TASK>
[  146.063833]  dump_stack_lvl+0x73/0xb0
[  146.063866]  print_report+0xd1/0x650
[  146.063891]  ? __virt_addr_valid+0x1db/0x2d0
[  146.063915]  ? drm_encoder_cleanup+0x265/0x270
[  146.063936]  ? kasan_complete_mode_report_info+0x64/0x200
[  146.063959]  ? drm_encoder_cleanup+0x265/0x270
[  146.063981]  kasan_report+0x141/0x180
[  146.064001]  ? drm_encoder_cleanup+0x265/0x270
[  146.064026]  __asan_report_load8_noabort+0x18/0x20
[  146.064048]  drm_encoder_cleanup+0x265/0x270
[  146.064071]  drmm_encoder_alloc_release+0x36/0x60
[  146.064092]  drm_managed_release+0x15c/0x470
[  146.064114]  ? simple_release_fs+0x86/0xb0
[  146.064159]  drm_dev_put.part.0+0xa1/0x100
[  146.064181]  ? __pfx_devm_drm_dev_init_release+0x10/0x10
[  146.064203]  devm_drm_dev_init_release+0x17/0x30
[  146.064225]  devm_action_release+0x50/0x80
[  146.064249]  devres_release_all+0x186/0x240
[  146.064271]  ? __pfx_devres_release_all+0x10/0x10
[  146.064292]  ? kernfs_remove_by_name_ns+0x166/0x1d0
[  146.064317]  ? sysfs_remove_file_ns+0x56/0xa0
[  146.064340]  device_unbind_cleanup+0x1b/0x1b0
[  146.064361]  device_release_driver_internal+0x3e4/0x540
[  146.064380]  ? klist_devices_put+0x35/0x50
[  146.064406]  device_release_driver+0x16/0x20
[  146.064426]  bus_remove_device+0x1e9/0x3d0
[  146.064446]  device_del+0x397/0x980
[  146.064468]  ? __pfx_device_del+0x10/0x10
[  146.064487]  ? __kasan_check_write+0x18/0x20
[  146.064508]  ? _raw_spin_lock_irqsave+0xa1/0x100
[  146.064531]  ? __pfx_device_unregister_wrapper+0x10/0x10
[  146.064556]  device_unregister+0x1b/0xa0
[  146.064574]  device_unregister_wrapper+0x12/0x20
[  146.064598]  __kunit_action_free+0x57/0x70
[  146.064621]  kunit_remove_resource+0x133/0x200
[  146.064641]  ? preempt_count_sub+0x50/0x80
[  146.064664]  kunit_cleanup+0x7a/0x120
[  146.064687]  kunit_try_run_case_cleanup+0xbd/0xf0
[  146.064708]  ? __pfx_kunit_try_run_case_cleanup+0x10/0x10
[  146.064730]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[  146.064749]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[  146.064769]  kthread+0x337/0x6f0
[  146.064790]  ? trace_preempt_on+0x20/0xc0
[  146.064814]  ? __pfx_kthread+0x10/0x10
[  146.064834]  ? _raw_spin_unlock_irq+0x47/0x80
[  146.064853]  ? calculate_sigpending+0x7b/0xa0
[  146.064875]  ? __pfx_kthread+0x10/0x10
[  146.064896]  ret_from_fork+0x116/0x1d0
[  146.064914]  ? __pfx_kthread+0x10/0x10
[  146.064933]  ret_from_fork_asm+0x1a/0x30
[  146.064964]  </TASK>
[  146.064975] 
[  146.082463] Allocated by task 1604:
[  146.082797]  kasan_save_stack+0x45/0x70
[  146.083167]  kasan_save_track+0x18/0x40
[  146.083492]  kasan_save_alloc_info+0x3b/0x50
[  146.083869]  __kasan_kmalloc+0xb7/0xc0
[  146.084302]  __kmalloc_noprof+0x1c9/0x500
[  146.084607]  __devm_drm_bridge_alloc+0x33/0x170
[  146.084756]  drm_test_bridge_init+0x188/0x5c0
[  146.084900]  drm_test_drm_bridge_get_current_state_atomic+0xea/0x870
[  146.085087]  kunit_try_run_case+0x1a5/0x480
[  146.085455]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[  146.086026]  kthread+0x337/0x6f0
[  146.086355]  ret_from_fork+0x116/0x1d0
[  146.086701]  ret_from_fork_asm+0x1a/0x30
[  146.087046] 
[  146.087206] Freed by task 1605:
[  146.087511]  kasan_save_stack+0x45/0x70
[  146.087946]  kasan_save_track+0x18/0x40
[  146.088223]  kasan_save_free_info+0x3f/0x60
[  146.088382]  __kasan_slab_free+0x56/0x70
[  146.088511]  kfree+0x222/0x3f0
[  146.088627]  drm_bridge_put.part.0+0xc7/0x100
[  146.088766]  drm_bridge_put_void+0x17/0x30
[  146.088899]  devm_action_release+0x50/0x80
[  146.089031]  devres_release_all+0x186/0x240
[  146.089202]  device_unbind_cleanup+0x1b/0x1b0
[  146.089403]  device_release_driver_internal+0x3e4/0x540
[  146.089592]  device_release_driver+0x16/0x20
[  146.089792]  bus_remove_device+0x1e9/0x3d0
[  146.089961]  device_del+0x397/0x980
[  146.090123]  device_unregister+0x1b/0xa0
[  146.090295]  device_unregister_wrapper+0x12/0x20
[  146.090479]  __kunit_action_free+0x57/0x70
[  146.090612]  kunit_remove_resource+0x133/0x200
[  146.090755]  kunit_cleanup+0x7a/0x120
[  146.090932]  kunit_try_run_case_cleanup+0xbd/0xf0
[  146.091138]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[  146.091461]  kthread+0x337/0x6f0
[  146.091618]  ret_from_fork+0x116/0x1d0
[  146.091742]  ret_from_fork_asm+0x1a/0x30
[  146.091875] 
[  146.091941] The buggy address belongs to the object at ffff88810a109c00
[  146.091941]  which belongs to the cache kmalloc-512 of size 512
[  146.092491] The buggy address is located 112 bytes inside of
[  146.092491]  freed 512-byte region [ffff88810a109c00, ffff88810a109e00)
[  146.093274] 
[  146.093356] The buggy address belongs to the physical page:
[  146.093526] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10a108
[  146.093870] head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[  146.094755] flags: 0x200000000000040(head|node=0|zone=2)
[  146.094969] page_type: f5(slab)
[  146.095214] raw: 0200000000000040 ffff888100041c80 dead000000000122 0000000000000000
[  146.095674] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[  146.095994] head: 0200000000000040 ffff888100041c80 dead000000000122 0000000000000000
[  146.096486] head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[  146.096868] head: 0200000000000002 ffffea0004284201 00000000ffffffff 00000000ffffffff
[  146.097157] head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
[  146.097532] page dumped because: kasan: bad access detected
[  146.097781] 
[  146.097861] Memory state around the buggy address:
[  146.098069]  ffff88810a109b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[  146.098710]  ffff88810a109b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[  146.098990] >ffff88810a109c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  146.099501]                                                              ^
[  146.099769]  ffff88810a109c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  146.100162]  ffff88810a109d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  146.100517] ==================================================================