[   26.377691] ==================================================================
[   26.378644] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560
[   26.378888] Read of size 8 at addr ffff888105810700 by task kunit_try_catch/249
[   26.379728] 
[   26.380102] CPU: 0 UID: 0 PID: 249 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc7-next-20250725 #1 PREEMPT(voluntary) 
[   26.380156] Tainted: [B]=BAD_PAGE, [N]=TEST
[   26.380169] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   26.380337] Call Trace:
[   26.380354]  <TASK>
[   26.380384]  dump_stack_lvl+0x73/0xb0
[   26.380418]  print_report+0xd1/0x640
[   26.380478]  ? __virt_addr_valid+0x1db/0x2d0
[   26.380504]  ? workqueue_uaf+0x4d6/0x560
[   26.380526]  ? kasan_complete_mode_report_info+0x64/0x200
[   26.380552]  ? workqueue_uaf+0x4d6/0x560
[   26.380575]  kasan_report+0x141/0x180
[   26.380598]  ? workqueue_uaf+0x4d6/0x560
[   26.380624]  __asan_report_load8_noabort+0x18/0x20
[   26.380649]  workqueue_uaf+0x4d6/0x560
[   26.380671]  ? __pfx_workqueue_uaf+0x10/0x10
[   26.380694]  ? __schedule+0x10da/0x2b60
[   26.380716]  ? __pfx_read_tsc+0x10/0x10
[   26.380738]  ? ktime_get_ts64+0x86/0x230
[   26.380764]  kunit_try_run_case+0x1a5/0x480
[   26.380860]  ? __pfx_kunit_try_run_case+0x10/0x10
[   26.380885]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   26.380908]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   26.380934]  ? __kthread_parkme+0x82/0x180
[   26.380967]  ? preempt_count_sub+0x50/0x80
[   26.380991]  ? __pfx_kunit_try_run_case+0x10/0x10
[   26.381016]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   26.381040]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   26.381072]  kthread+0x337/0x6f0
[   26.381092]  ? trace_preempt_on+0x20/0xc0
[   26.381116]  ? __pfx_kthread+0x10/0x10
[   26.381142]  ? _raw_spin_unlock_irq+0x47/0x80
[   26.381167]  ? calculate_sigpending+0x7b/0xa0
[   26.381191]  ? __pfx_kthread+0x10/0x10
[   26.381213]  ret_from_fork+0x116/0x1d0
[   26.381232]  ? __pfx_kthread+0x10/0x10
[   26.381253]  ret_from_fork_asm+0x1a/0x30
[   26.381284]  </TASK>
[   26.381296] 
[   26.397636] Allocated by task 249:
[   26.397773]  kasan_save_stack+0x45/0x70
[   26.397920]  kasan_save_track+0x18/0x40
[   26.398305]  kasan_save_alloc_info+0x3b/0x50
[   26.398640]  __kasan_kmalloc+0xb7/0xc0
[   26.398775]  __kmalloc_cache_noprof+0x189/0x420
[   26.399332]  workqueue_uaf+0x152/0x560
[   26.399740]  kunit_try_run_case+0x1a5/0x480
[   26.400117]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   26.400302]  kthread+0x337/0x6f0
[   26.400423]  ret_from_fork+0x116/0x1d0
[   26.400555]  ret_from_fork_asm+0x1a/0x30
[   26.400693] 
[   26.400758] Freed by task 9:
[   26.400894]  kasan_save_stack+0x45/0x70
[   26.401037]  kasan_save_track+0x18/0x40
[   26.401236]  kasan_save_free_info+0x3f/0x60
[   26.401504]  __kasan_slab_free+0x5e/0x80
[   26.401699]  kfree+0x222/0x3f0
[   26.401957]  workqueue_uaf_work+0x12/0x20
[   26.402363]  process_one_work+0x5ee/0xf60
[   26.402603]  worker_thread+0x758/0x1220
[   26.402753]  kthread+0x337/0x6f0
[   26.402872]  ret_from_fork+0x116/0x1d0
[   26.403144]  ret_from_fork_asm+0x1a/0x30
[   26.403486] 
[   26.403727] Last potentially related work creation:
[   26.404576]  kasan_save_stack+0x45/0x70
[   26.404848]  kasan_record_aux_stack+0xb2/0xc0
[   26.405254]  __queue_work+0x61a/0xe70
[   26.405473]  queue_work_on+0xb6/0xc0
[   26.405954]  workqueue_uaf+0x26d/0x560
[   26.406163]  kunit_try_run_case+0x1a5/0x480
[   26.406721]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   26.407260]  kthread+0x337/0x6f0
[   26.407816]  ret_from_fork+0x116/0x1d0
[   26.408287]  ret_from_fork_asm+0x1a/0x30
[   26.408441] 
[   26.408510] The buggy address belongs to the object at ffff888105810700
[   26.408510]  which belongs to the cache kmalloc-32 of size 32
[   26.409203] The buggy address is located 0 bytes inside of
[   26.409203]  freed 32-byte region [ffff888105810700, ffff888105810720)
[   26.410590] 
[   26.410895] The buggy address belongs to the physical page:
[   26.411581] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105810
[   26.412109] flags: 0x200000000000000(node=0|zone=2)
[   26.412290] page_type: f5(slab)
[   26.412416] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   26.412652] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   26.413497] page dumped because: kasan: bad access detected
[   26.414169] 
[   26.414482] Memory state around the buggy address:
[   26.415044]  ffff888105810600: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc
[   26.415801]  ffff888105810680: 00 00 00 fc fc fc fc fc 00 00 00 07 fc fc fc fc
[   26.416628] >ffff888105810700: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   26.417396]                    ^
[   26.417711]  ffff888105810780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   26.418579]  ffff888105810800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   26.419173] ==================================================================