[   26.248066] ==================================================================
[   26.248600] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560
[   26.248827] Read of size 8 at addr ffff88810613bf00 by task kunit_try_catch/249
[   26.249041] 
[   26.249174] CPU: 0 UID: 0 PID: 249 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6-next-20250717 #1 PREEMPT(voluntary) 
[   26.249457] Tainted: [B]=BAD_PAGE, [N]=TEST
[   26.249475] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   26.249498] Call Trace:
[   26.249511]  <TASK>
[   26.249529]  dump_stack_lvl+0x73/0xb0
[   26.249562]  print_report+0xd1/0x610
[   26.249583]  ? __virt_addr_valid+0x1db/0x2d0
[   26.249607]  ? workqueue_uaf+0x4d6/0x560
[   26.249627]  ? kasan_complete_mode_report_info+0x64/0x200
[   26.249651]  ? workqueue_uaf+0x4d6/0x560
[   26.249672]  kasan_report+0x141/0x180
[   26.249693]  ? workqueue_uaf+0x4d6/0x560
[   26.249718]  __asan_report_load8_noabort+0x18/0x20
[   26.249740]  workqueue_uaf+0x4d6/0x560
[   26.249761]  ? __pfx_workqueue_uaf+0x10/0x10
[   26.249782]  ? __schedule+0x10c6/0x2b60
[   26.249804]  ? __pfx_read_tsc+0x10/0x10
[   26.249825]  ? ktime_get_ts64+0x86/0x230
[   26.249850]  kunit_try_run_case+0x1a5/0x480
[   26.249874]  ? __pfx_kunit_try_run_case+0x10/0x10
[   26.249895]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   26.249917]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   26.249945]  ? __kthread_parkme+0x82/0x180
[   26.249970]  ? preempt_count_sub+0x50/0x80
[   26.249993]  ? __pfx_kunit_try_run_case+0x10/0x10
[   26.250015]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   26.250037]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   26.250059]  kthread+0x337/0x6f0
[   26.250462]  ? trace_preempt_on+0x20/0xc0
[   26.250522]  ? __pfx_kthread+0x10/0x10
[   26.250557]  ? _raw_spin_unlock_irq+0x47/0x80
[   26.250578]  ? calculate_sigpending+0x7b/0xa0
[   26.250602]  ? __pfx_kthread+0x10/0x10
[   26.250622]  ret_from_fork+0x116/0x1d0
[   26.250640]  ? __pfx_kthread+0x10/0x10
[   26.250660]  ret_from_fork_asm+0x1a/0x30
[   26.250691]  </TASK>
[   26.250702] 
[   26.265124] Allocated by task 249:
[   26.265668]  kasan_save_stack+0x45/0x70
[   26.266225]  kasan_save_track+0x18/0x40
[   26.266721]  kasan_save_alloc_info+0x3b/0x50
[   26.267053]  __kasan_kmalloc+0xb7/0xc0
[   26.267197]  __kmalloc_cache_noprof+0x189/0x420
[   26.267355]  workqueue_uaf+0x152/0x560
[   26.267630]  kunit_try_run_case+0x1a5/0x480
[   26.268322]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   26.268869]  kthread+0x337/0x6f0
[   26.269299]  ret_from_fork+0x116/0x1d0
[   26.269739]  ret_from_fork_asm+0x1a/0x30
[   26.270197] 
[   26.270507] Freed by task 9:
[   26.270856]  kasan_save_stack+0x45/0x70
[   26.270995]  kasan_save_track+0x18/0x40
[   26.271137]  kasan_save_free_info+0x3f/0x60
[   26.271327]  __kasan_slab_free+0x56/0x70
[   26.271976]  kfree+0x222/0x3f0
[   26.272451]  workqueue_uaf_work+0x12/0x20
[   26.272948]  process_one_work+0x5ee/0xf60
[   26.273521]  worker_thread+0x758/0x1220
[   26.273976]  kthread+0x337/0x6f0
[   26.274390]  ret_from_fork+0x116/0x1d0
[   26.274765]  ret_from_fork_asm+0x1a/0x30
[   26.274912] 
[   26.274978] Last potentially related work creation:
[   26.275136]  kasan_save_stack+0x45/0x70
[   26.275287]  kasan_record_aux_stack+0xb2/0xc0
[   26.275987]  __queue_work+0x61a/0xe70
[   26.276596]  queue_work_on+0xb6/0xc0
[   26.277060]  workqueue_uaf+0x26d/0x560
[   26.277578]  kunit_try_run_case+0x1a5/0x480
[   26.278065]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   26.278697]  kthread+0x337/0x6f0
[   26.279094]  ret_from_fork+0x116/0x1d0
[   26.279526]  ret_from_fork_asm+0x1a/0x30
[   26.279886] 
[   26.280042] The buggy address belongs to the object at ffff88810613bf00
[   26.280042]  which belongs to the cache kmalloc-32 of size 32
[   26.281056] The buggy address is located 0 bytes inside of
[   26.281056]  freed 32-byte region [ffff88810613bf00, ffff88810613bf20)
[   26.281890] 
[   26.281973] The buggy address belongs to the physical page:
[   26.282159] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10613b
[   26.282406] flags: 0x200000000000000(node=0|zone=2)
[   26.282566] page_type: f5(slab)
[   26.282688] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   26.282918] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   26.283146] page dumped because: kasan: bad access detected
[   26.283309] 
[   26.283370] Memory state around the buggy address:
[   26.283519]  ffff88810613be00: 00 00 00 fc fc fc fc fc 00 00 05 fc fc fc fc fc
[   26.283725]  ffff88810613be80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   26.283930] >ffff88810613bf00: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   26.284262]                    ^
[   26.284540]  ffff88810613bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   26.285659]  ffff88810613c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   26.285940] ==================================================================