[  180.007397] ==================================================================
[  180.007948] BUG: KASAN: slab-use-after-free in drm_encoder_cleanup+0x265/0x270
[  180.008555] Read of size 8 at addr ffff88810769ac70 by task kunit_try_catch/1610
[  180.009120] 
[  180.009285] CPU: 0 UID: 0 PID: 1610 Comm: kunit_try_catch Tainted: G    B D W        N  6.16.0-rc2-next-20250620 #1 PREEMPT(voluntary) 
[  180.009384] Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN, [N]=TEST
[  180.010184] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[  180.010232] Call Trace:
[  180.010253]  <TASK>
[  180.010285]  dump_stack_lvl+0x73/0xb0
[  180.010337]  print_report+0xd1/0x650
[  180.010366]  ? __virt_addr_valid+0x1db/0x2d0
[  180.010392]  ? drm_encoder_cleanup+0x265/0x270
[  180.010444]  ? kasan_complete_mode_report_info+0x64/0x200
[  180.010473]  ? drm_encoder_cleanup+0x265/0x270
[  180.010498]  kasan_report+0x141/0x180
[  180.010522]  ? drm_encoder_cleanup+0x265/0x270
[  180.010551]  __asan_report_load8_noabort+0x18/0x20
[  180.010576]  drm_encoder_cleanup+0x265/0x270
[  180.010602]  drmm_encoder_alloc_release+0x36/0x60
[  180.010627]  drm_managed_release+0x15c/0x470
[  180.010652]  ? simple_release_fs+0x86/0xb0
[  180.010680]  drm_dev_put.part.0+0xa1/0x100
[  180.010706]  ? __pfx_devm_drm_dev_init_release+0x10/0x10
[  180.010731]  devm_drm_dev_init_release+0x17/0x30
[  180.010756]  devm_action_release+0x50/0x80
[  180.010784]  devres_release_all+0x186/0x240
[  180.010809]  ? __pfx_devres_release_all+0x10/0x10
[  180.010833]  ? kernfs_remove_by_name_ns+0x166/0x1d0
[  180.010861]  ? sysfs_remove_file_ns+0x56/0xa0
[  180.010887]  device_unbind_cleanup+0x1b/0x1b0
[  180.010911]  device_release_driver_internal+0x3e4/0x540
[  180.010935]  ? klist_devices_put+0x35/0x50
[  180.010958]  device_release_driver+0x16/0x20
[  180.010981]  bus_remove_device+0x1e9/0x3d0
[  180.011005]  device_del+0x397/0x980
[  180.011031]  ? __pfx_device_del+0x10/0x10
[  180.011053]  ? __kasan_check_write+0x18/0x20
[  180.011077]  ? _raw_spin_lock_irqsave+0xa1/0x100
[  180.011101]  ? __pfx_device_unregister_wrapper+0x10/0x10
[  180.011144]  device_unregister+0x1b/0xa0
[  180.011169]  device_unregister_wrapper+0x12/0x20
[  180.011191]  __kunit_action_free+0x57/0x70
[  180.011215]  kunit_remove_resource+0x133/0x200
[  180.011239]  ? preempt_count_sub+0x50/0x80
[  180.011265]  kunit_cleanup+0x7a/0x120
[  180.011291]  kunit_try_run_case_cleanup+0xbd/0xf0
[  180.011315]  ? __pfx_kunit_try_run_case_cleanup+0x10/0x10
[  180.011340]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[  180.011362]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[  180.011384]  kthread+0x337/0x6f0
[  180.011417]  ? trace_preempt_on+0x20/0xc0
[  180.011449]  ? __pfx_kthread+0x10/0x10
[  180.011472]  ? _raw_spin_unlock_irq+0x47/0x80
[  180.011494]  ? calculate_sigpending+0x7b/0xa0
[  180.011520]  ? __pfx_kthread+0x10/0x10
[  180.011543]  ret_from_fork+0x116/0x1d0
[  180.011565]  ? __pfx_kthread+0x10/0x10
[  180.011588]  ret_from_fork_asm+0x1a/0x30
[  180.011622]  </TASK>
[  180.011638] 
[  180.025925] Allocated by task 1609:
[  180.026359]  kasan_save_stack+0x45/0x70
[  180.026674]  kasan_save_track+0x18/0x40
[  180.026859]  kasan_save_alloc_info+0x3b/0x50
[  180.027295]  __kasan_kmalloc+0xb7/0xc0
[  180.027630]  __kmalloc_noprof+0x1c9/0x500
[  180.027967]  __devm_drm_bridge_alloc+0x33/0x170
[  180.028248]  drm_test_bridge_init+0x188/0x5c0
[  180.028456]  drm_test_drm_bridge_get_current_state_atomic+0xea/0x870
[  180.028695]  kunit_try_run_case+0x1a5/0x480
[  180.028891]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[  180.029136]  kthread+0x337/0x6f0
[  180.029305]  ret_from_fork+0x116/0x1d0
[  180.029624]  ret_from_fork_asm+0x1a/0x30
[  180.030050] 
[  180.030324] Freed by task 1610:
[  180.030618]  kasan_save_stack+0x45/0x70
[  180.030947]  kasan_save_track+0x18/0x40
[  180.031342]  kasan_save_free_info+0x3f/0x60
[  180.031752]  __kasan_slab_free+0x56/0x70
[  180.032147]  kfree+0x222/0x3f0
[  180.032463]  drm_bridge_put.part.0+0xc7/0x100
[  180.032828]  drm_bridge_put_void+0x17/0x30
[  180.033267]  devm_action_release+0x50/0x80
[  180.033503]  devres_release_all+0x186/0x240
[  180.033896]  device_unbind_cleanup+0x1b/0x1b0
[  180.034341]  device_release_driver_internal+0x3e4/0x540
[  180.034736]  device_release_driver+0x16/0x20
[  180.035034]  bus_remove_device+0x1e9/0x3d0
[  180.035417]  device_del+0x397/0x980
[  180.035685]  device_unregister+0x1b/0xa0
[  180.036039]  device_unregister_wrapper+0x12/0x20
[  180.036396]  __kunit_action_free+0x57/0x70
[  180.036741]  kunit_remove_resource+0x133/0x200
[  180.037134]  kunit_cleanup+0x7a/0x120
[  180.037512]  kunit_try_run_case_cleanup+0xbd/0xf0
[  180.037827]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[  180.038318]  kthread+0x337/0x6f0
[  180.038550]  ret_from_fork+0x116/0x1d0
[  180.038730]  ret_from_fork_asm+0x1a/0x30
[  180.038919] 
[  180.039027] The buggy address belongs to the object at ffff88810769ac00
[  180.039027]  which belongs to the cache kmalloc-512 of size 512
[  180.039447] The buggy address is located 112 bytes inside of
[  180.039447]  freed 512-byte region [ffff88810769ac00, ffff88810769ae00)
[  180.040385] 
[  180.040584] The buggy address belongs to the physical page:
[  180.041010] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107698
[  180.041792] head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[  180.042454] flags: 0x200000000000040(head|node=0|zone=2)
[  180.042945] page_type: f5(slab)
[  180.043260] raw: 0200000000000040 ffff888100041c80 dead000000000122 0000000000000000
[  180.044180] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[  180.044626] head: 0200000000000040 ffff888100041c80 dead000000000122 0000000000000000
[  180.045208] head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[  180.045677] head: 0200000000000002 ffffea00041da601 00000000ffffffff 00000000ffffffff
[  180.046131] head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
[  180.047692] page dumped because: kasan: bad access detected
[  180.048220] 
[  180.048402] Memory state around the buggy address:
[  180.048820]  ffff88810769ab00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[  180.049489]  ffff88810769ab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[  180.049937] >ffff88810769ac00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  180.050213]                                                              ^
[  180.050464]  ffff88810769ac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  180.050942]  ffff88810769ad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[  180.051379] ==================================================================