[   13.086858] ==================================================================
[   13.087623] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560
[   13.087907] Read of size 8 at addr ffff88810279cfc0 by task kunit_try_catch/217
[   13.088353] 
[   13.088469] CPU: 1 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   13.088513] Tainted: [B]=BAD_PAGE, [N]=TEST
[   13.088524] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   13.088543] Call Trace:
[   13.088555]  <TASK>
[   13.088570]  dump_stack_lvl+0x73/0xb0
[   13.088599]  print_report+0xd1/0x650
[   13.088620]  ? __virt_addr_valid+0x1db/0x2d0
[   13.088664]  ? workqueue_uaf+0x4d6/0x560
[   13.088685]  ? kasan_complete_mode_report_info+0x64/0x200
[   13.088708]  ? workqueue_uaf+0x4d6/0x560
[   13.088729]  kasan_report+0x141/0x180
[   13.088750]  ? workqueue_uaf+0x4d6/0x560
[   13.088776]  __asan_report_load8_noabort+0x18/0x20
[   13.088801]  workqueue_uaf+0x4d6/0x560
[   13.088822]  ? __pfx_workqueue_uaf+0x10/0x10
[   13.088844]  ? __schedule+0x10cc/0x2b60
[   13.088917]  ? __pfx_read_tsc+0x10/0x10
[   13.088972]  ? ktime_get_ts64+0x86/0x230
[   13.088997]  kunit_try_run_case+0x1a5/0x480
[   13.089021]  ? __pfx_kunit_try_run_case+0x10/0x10
[   13.089054]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   13.089078]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   13.089102]  ? __kthread_parkme+0x82/0x180
[   13.089122]  ? preempt_count_sub+0x50/0x80
[   13.089145]  ? __pfx_kunit_try_run_case+0x10/0x10
[   13.089170]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.089194]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   13.089221]  kthread+0x337/0x6f0
[   13.089241]  ? trace_preempt_on+0x20/0xc0
[   13.089265]  ? __pfx_kthread+0x10/0x10
[   13.089285]  ? _raw_spin_unlock_irq+0x47/0x80
[   13.089307]  ? calculate_sigpending+0x7b/0xa0
[   13.089331]  ? __pfx_kthread+0x10/0x10
[   13.089351]  ret_from_fork+0x116/0x1d0
[   13.089369]  ? __pfx_kthread+0x10/0x10
[   13.089389]  ret_from_fork_asm+0x1a/0x30
[   13.089419]  </TASK>
[   13.089429] 
[   13.099164] Allocated by task 217:
[   13.099312]  kasan_save_stack+0x45/0x70
[   13.099587]  kasan_save_track+0x18/0x40
[   13.099779]  kasan_save_alloc_info+0x3b/0x50
[   13.100059]  __kasan_kmalloc+0xb7/0xc0
[   13.100322]  __kmalloc_cache_noprof+0x189/0x420
[   13.100542]  workqueue_uaf+0x152/0x560
[   13.100689]  kunit_try_run_case+0x1a5/0x480
[   13.101056]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.101350]  kthread+0x337/0x6f0
[   13.101494]  ret_from_fork+0x116/0x1d0
[   13.101700]  ret_from_fork_asm+0x1a/0x30
[   13.101893] 
[   13.101985] Freed by task 44:
[   13.102162]  kasan_save_stack+0x45/0x70
[   13.102295]  kasan_save_track+0x18/0x40
[   13.102644]  kasan_save_free_info+0x3f/0x60
[   13.103087]  __kasan_slab_free+0x56/0x70
[   13.103305]  kfree+0x222/0x3f0
[   13.103530]  workqueue_uaf_work+0x12/0x20
[   13.103791]  process_one_work+0x5ee/0xf60
[   13.103935]  worker_thread+0x758/0x1220
[   13.104659]  kthread+0x337/0x6f0
[   13.104862]  ret_from_fork+0x116/0x1d0
[   13.105278]  ret_from_fork_asm+0x1a/0x30
[   13.105498] 
[   13.105588] Last potentially related work creation:
[   13.105793]  kasan_save_stack+0x45/0x70
[   13.106202]  kasan_record_aux_stack+0xb2/0xc0
[   13.106554]  __queue_work+0x626/0xeb0
[   13.106923]  queue_work_on+0xb6/0xc0
[   13.107360]  workqueue_uaf+0x26d/0x560
[   13.107545]  kunit_try_run_case+0x1a5/0x480
[   13.107742]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.108292]  kthread+0x337/0x6f0
[   13.108584]  ret_from_fork+0x116/0x1d0
[   13.109005]  ret_from_fork_asm+0x1a/0x30
[   13.109225] 
[   13.109315] The buggy address belongs to the object at ffff88810279cfc0
[   13.109315]  which belongs to the cache kmalloc-32 of size 32
[   13.109791] The buggy address is located 0 bytes inside of
[   13.109791]  freed 32-byte region [ffff88810279cfc0, ffff88810279cfe0)
[   13.110770] 
[   13.111096] The buggy address belongs to the physical page:
[   13.111561] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10279c
[   13.112205] flags: 0x200000000000000(node=0|zone=2)
[   13.112433] page_type: f5(slab)
[   13.112583] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   13.113389] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   13.113902] page dumped because: kasan: bad access detected
[   13.114137] 
[   13.114226] Memory state around the buggy address:
[   13.114435]  ffff88810279ce80: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   13.114720]  ffff88810279cf00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   13.115372] >ffff88810279cf80: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   13.115653]                                            ^
[   13.116265]  ffff88810279d000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   13.116569]  ffff88810279d080: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
[   13.116951] ==================================================================