[   12.022429] ==================================================================
[   12.022904] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560
[   12.023199] Read of size 8 at addr ffff888102782600 by task kunit_try_catch/217
[   12.023537] 
[   12.023652] CPU: 1 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G    B            N  6.15.0-next-20250605 #1 PREEMPT(voluntary) 
[   12.023696] Tainted: [B]=BAD_PAGE, [N]=TEST
[   12.023707] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   12.023728] Call Trace:
[   12.023739]  <TASK>
[   12.023770]  dump_stack_lvl+0x73/0xb0
[   12.023798]  print_report+0xd1/0x650
[   12.023819]  ? __virt_addr_valid+0x1db/0x2d0
[   12.023843]  ? workqueue_uaf+0x4d6/0x560
[   12.023863]  ? kasan_complete_mode_report_info+0x64/0x200
[   12.023885]  ? workqueue_uaf+0x4d6/0x560
[   12.023917]  kasan_report+0x141/0x180
[   12.023938]  ? workqueue_uaf+0x4d6/0x560
[   12.024008]  __asan_report_load8_noabort+0x18/0x20
[   12.024029]  workqueue_uaf+0x4d6/0x560
[   12.024050]  ? __pfx_workqueue_uaf+0x10/0x10
[   12.024072]  ? __schedule+0x10cc/0x2b60
[   12.024095]  ? __pfx_read_tsc+0x10/0x10
[   12.024116]  ? ktime_get_ts64+0x86/0x230
[   12.024140]  kunit_try_run_case+0x1a5/0x480
[   12.024161]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.024180]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   12.024205]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   12.024228]  ? __kthread_parkme+0x82/0x180
[   12.024248]  ? preempt_count_sub+0x50/0x80
[   12.024271]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.024291]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.024315]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   12.024338]  kthread+0x337/0x6f0
[   12.024357]  ? trace_preempt_on+0x20/0xc0
[   12.024380]  ? __pfx_kthread+0x10/0x10
[   12.024399]  ? _raw_spin_unlock_irq+0x47/0x80
[   12.024421]  ? calculate_sigpending+0x7b/0xa0
[   12.024445]  ? __pfx_kthread+0x10/0x10
[   12.024465]  ret_from_fork+0x116/0x1d0
[   12.024482]  ? __pfx_kthread+0x10/0x10
[   12.024502]  ret_from_fork_asm+0x1a/0x30
[   12.024532]  </TASK>
[   12.024543] 
[   12.032030] Allocated by task 217:
[   12.032186]  kasan_save_stack+0x45/0x70
[   12.032351]  kasan_save_track+0x18/0x40
[   12.032546]  kasan_save_alloc_info+0x3b/0x50
[   12.032733]  __kasan_kmalloc+0xb7/0xc0
[   12.032928]  __kmalloc_cache_noprof+0x189/0x420
[   12.033143]  workqueue_uaf+0x152/0x560
[   12.033312]  kunit_try_run_case+0x1a5/0x480
[   12.033502]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.033716]  kthread+0x337/0x6f0
[   12.034077]  ret_from_fork+0x116/0x1d0
[   12.034219]  ret_from_fork_asm+0x1a/0x30
[   12.034359] 
[   12.034456] Freed by task 44:
[   12.034606]  kasan_save_stack+0x45/0x70
[   12.034797]  kasan_save_track+0x18/0x40
[   12.034999]  kasan_save_free_info+0x3f/0x60
[   12.035316]  __kasan_slab_free+0x56/0x70
[   12.035469]  kfree+0x222/0x3f0
[   12.035586]  workqueue_uaf_work+0x12/0x20
[   12.035749]  process_one_work+0x5ee/0xf60
[   12.035995]  worker_thread+0x758/0x1220
[   12.036366]  kthread+0x337/0x6f0
[   12.036521]  ret_from_fork+0x116/0x1d0
[   12.036653]  ret_from_fork_asm+0x1a/0x30
[   12.036791] 
[   12.036862] Last potentially related work creation:
[   12.037025]  kasan_save_stack+0x45/0x70
[   12.037165]  kasan_record_aux_stack+0xb2/0xc0
[   12.037418]  __queue_work+0x626/0xeb0
[   12.037606]  queue_work_on+0xb6/0xc0
[   12.037792]  workqueue_uaf+0x26d/0x560
[   12.037996]  kunit_try_run_case+0x1a5/0x480
[   12.038387]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.038560]  kthread+0x337/0x6f0
[   12.038678]  ret_from_fork+0x116/0x1d0
[   12.038807]  ret_from_fork_asm+0x1a/0x30
[   12.039107] 
[   12.039206] The buggy address belongs to the object at ffff888102782600
[   12.039206]  which belongs to the cache kmalloc-32 of size 32
[   12.039905] The buggy address is located 0 bytes inside of
[   12.039905]  freed 32-byte region [ffff888102782600, ffff888102782620)
[   12.040435] 
[   12.040531] The buggy address belongs to the physical page:
[   12.040800] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102782
[   12.041141] flags: 0x200000000000000(node=0|zone=2)
[   12.041328] page_type: f5(slab)
[   12.041449] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   12.041976] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   12.042330] page dumped because: kasan: bad access detected
[   12.042587] 
[   12.042772] Memory state around the buggy address:
[   12.043026]  ffff888102782500: 00 00 00 fc fc fc fc fc 00 00 03 fc fc fc fc fc
[   12.043310]  ffff888102782580: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc
[   12.043608] >ffff888102782600: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   12.043919]                    ^
[   12.044099]  ffff888102782680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   12.044396]  ffff888102782700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   12.044711] ==================================================================