[   25.576309] ==================================================================
[   25.577074] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560
[   25.577573] Read of size 8 at addr ffff888104516100 by task kunit_try_catch/249
[   25.578146] 
[   25.578602] CPU: 1 UID: 0 PID: 249 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4-next-20250704 #1 PREEMPT(voluntary) 
[   25.578679] Tainted: [B]=BAD_PAGE, [N]=TEST
[   25.578694] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   25.578765] Call Trace:
[   25.578782]  <TASK>
[   25.578806]  dump_stack_lvl+0x73/0xb0
[   25.578844]  print_report+0xd1/0x650
[   25.578870]  ? __virt_addr_valid+0x1db/0x2d0
[   25.578910]  ? workqueue_uaf+0x4d6/0x560
[   25.578932]  ? kasan_complete_mode_report_info+0x64/0x200
[   25.578960]  ? workqueue_uaf+0x4d6/0x560
[   25.578983]  kasan_report+0x141/0x180
[   25.579007]  ? workqueue_uaf+0x4d6/0x560
[   25.579035]  __asan_report_load8_noabort+0x18/0x20
[   25.579060]  workqueue_uaf+0x4d6/0x560
[   25.579084]  ? __pfx_workqueue_uaf+0x10/0x10
[   25.579108]  ? __schedule+0x10cc/0x2b60
[   25.579134]  ? __pfx_read_tsc+0x10/0x10
[   25.579171]  ? ktime_get_ts64+0x86/0x230
[   25.579200]  kunit_try_run_case+0x1a5/0x480
[   25.579231]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.579257]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   25.579283]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   25.579309]  ? __kthread_parkme+0x82/0x180
[   25.579333]  ? preempt_count_sub+0x50/0x80
[   25.579359]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.579386]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.579424]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   25.579450]  kthread+0x337/0x6f0
[   25.579472]  ? trace_preempt_on+0x20/0xc0
[   25.579499]  ? __pfx_kthread+0x10/0x10
[   25.579521]  ? _raw_spin_unlock_irq+0x47/0x80
[   25.579545]  ? calculate_sigpending+0x7b/0xa0
[   25.579572]  ? __pfx_kthread+0x10/0x10
[   25.579596]  ret_from_fork+0x116/0x1d0
[   25.579617]  ? __pfx_kthread+0x10/0x10
[   25.579639]  ret_from_fork_asm+0x1a/0x30
[   25.579674]  </TASK>
[   25.579689] 
[   25.589790] Allocated by task 249:
[   25.590113]  kasan_save_stack+0x45/0x70
[   25.590713]  kasan_save_track+0x18/0x40
[   25.590895]  kasan_save_alloc_info+0x3b/0x50
[   25.591672]  __kasan_kmalloc+0xb7/0xc0
[   25.591903]  __kmalloc_cache_noprof+0x189/0x420
[   25.592147]  workqueue_uaf+0x152/0x560
[   25.592532]  kunit_try_run_case+0x1a5/0x480
[   25.592901]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.593406]  kthread+0x337/0x6f0
[   25.593602]  ret_from_fork+0x116/0x1d0
[   25.594046]  ret_from_fork_asm+0x1a/0x30
[   25.594497] 
[   25.594609] Freed by task 41:
[   25.594769]  kasan_save_stack+0x45/0x70
[   25.595185]  kasan_save_track+0x18/0x40
[   25.595530]  kasan_save_free_info+0x3f/0x60
[   25.595948]  __kasan_slab_free+0x56/0x70
[   25.596311]  kfree+0x222/0x3f0
[   25.596487]  workqueue_uaf_work+0x12/0x20
[   25.596694]  process_one_work+0x5ee/0xf60
[   25.597054]  worker_thread+0x758/0x1220
[   25.597360]  kthread+0x337/0x6f0
[   25.597516]  ret_from_fork+0x116/0x1d0
[   25.597724]  ret_from_fork_asm+0x1a/0x30
[   25.597982] 
[   25.598081] Last potentially related work creation:
[   25.598313]  kasan_save_stack+0x45/0x70
[   25.598623]  kasan_record_aux_stack+0xb2/0xc0
[   25.598845]  __queue_work+0x61a/0xe70
[   25.599069]  queue_work_on+0xb6/0xc0
[   25.599222]  workqueue_uaf+0x26d/0x560
[   25.599562]  kunit_try_run_case+0x1a5/0x480
[   25.599823]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.600047]  kthread+0x337/0x6f0
[   25.600324]  ret_from_fork+0x116/0x1d0
[   25.600552]  ret_from_fork_asm+0x1a/0x30
[   25.600715] 
[   25.600789] The buggy address belongs to the object at ffff888104516100
[   25.600789]  which belongs to the cache kmalloc-32 of size 32
[   25.601816] The buggy address is located 0 bytes inside of
[   25.601816]  freed 32-byte region [ffff888104516100, ffff888104516120)
[   25.602453] 
[   25.602594] The buggy address belongs to the physical page:
[   25.602853] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x104516
[   25.603244] flags: 0x200000000000000(node=0|zone=2)
[   25.603608] page_type: f5(slab)
[   25.603810] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   25.604175] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   25.604625] page dumped because: kasan: bad access detected
[   25.604814] 
[   25.604940] Memory state around the buggy address:
[   25.605423]  ffff888104516000: 00 00 00 fc fc fc fc fc 00 00 03 fc fc fc fc fc
[   25.605674]  ffff888104516080: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc
[   25.606258] >ffff888104516100: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   25.606651]                    ^
[   25.606803]  ffff888104516180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.607411]  ffff888104516200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.607727] ==================================================================