[   11.709280] ==================================================================
[   11.710036] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560
[   11.710349] Read of size 8 at addr ffff8881028bd3c0 by task kunit_try_catch/220
[   11.710651] 
[   11.711033] CPU: 1 UID: 0 PID: 220 Comm: kunit_try_catch Tainted: G    B            N  6.15.8-rc1 #1 PREEMPT(voluntary) 
[   11.711354] Tainted: [B]=BAD_PAGE, [N]=TEST
[   11.711369] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   11.711392] Call Trace:
[   11.711406]  <TASK>
[   11.711423]  dump_stack_lvl+0x73/0xb0
[   11.711453]  print_report+0xd1/0x610
[   11.711484]  ? __virt_addr_valid+0x1db/0x2d0
[   11.711506]  ? workqueue_uaf+0x4d6/0x560
[   11.711527]  ? kasan_complete_mode_report_info+0x64/0x200
[   11.711549]  ? workqueue_uaf+0x4d6/0x560
[   11.711570]  kasan_report+0x141/0x180
[   11.711592]  ? workqueue_uaf+0x4d6/0x560
[   11.711618]  __asan_report_load8_noabort+0x18/0x20
[   11.711638]  workqueue_uaf+0x4d6/0x560
[   11.711693]  ? __pfx_workqueue_uaf+0x10/0x10
[   11.711716]  ? __schedule+0x10c6/0x2b60
[   11.711740]  ? __pfx_read_tsc+0x10/0x10
[   11.711760]  ? ktime_get_ts64+0x86/0x230
[   11.711786]  kunit_try_run_case+0x1a5/0x480
[   11.711807]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.711825]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   11.711846]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   11.711870]  ? __kthread_parkme+0x82/0x180
[   11.711891]  ? preempt_count_sub+0x50/0x80
[   11.711917]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.711936]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.711958]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   11.711980]  kthread+0x337/0x6f0
[   11.711997]  ? trace_preempt_on+0x20/0xc0
[   11.712020]  ? __pfx_kthread+0x10/0x10
[   11.712037]  ? _raw_spin_unlock_irq+0x47/0x80
[   11.712059]  ? calculate_sigpending+0x7b/0xa0
[   11.712082]  ? __pfx_kthread+0x10/0x10
[   11.712099]  ret_from_fork+0x41/0x80
[   11.712119]  ? __pfx_kthread+0x10/0x10
[   11.712136]  ret_from_fork_asm+0x1a/0x30
[   11.712167]  </TASK>
[   11.712177] 
[   11.724021] Allocated by task 220:
[   11.724190]  kasan_save_stack+0x45/0x70
[   11.724355]  kasan_save_track+0x18/0x40
[   11.724493]  kasan_save_alloc_info+0x3b/0x50
[   11.724786]  __kasan_kmalloc+0xb7/0xc0
[   11.724983]  __kmalloc_cache_noprof+0x189/0x420
[   11.725151]  workqueue_uaf+0x152/0x560
[   11.725293]  kunit_try_run_case+0x1a5/0x480
[   11.725622]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.725856]  kthread+0x337/0x6f0
[   11.726014]  ret_from_fork+0x41/0x80
[   11.726169]  ret_from_fork_asm+0x1a/0x30
[   11.726373] 
[   11.726453] Freed by task 105:
[   11.726592]  kasan_save_stack+0x45/0x70
[   11.726724]  kasan_save_track+0x18/0x40
[   11.726902]  kasan_save_free_info+0x3f/0x60
[   11.727111]  __kasan_slab_free+0x56/0x70
[   11.727402]  kfree+0x222/0x3f0
[   11.727595]  workqueue_uaf_work+0x12/0x20
[   11.728019]  process_one_work+0x5ee/0xf60
[   11.728717]  worker_thread+0x758/0x1220
[   11.728907]  kthread+0x337/0x6f0
[   11.729033]  ret_from_fork+0x41/0x80
[   11.730116]  ret_from_fork_asm+0x1a/0x30
[   11.730483] 
[   11.730564] Last potentially related work creation:
[   11.730719]  kasan_save_stack+0x45/0x70
[   11.730860]  kasan_record_aux_stack+0xb2/0xc0
[   11.731009]  __queue_work+0x626/0xeb0
[   11.731141]  queue_work_on+0xb6/0xc0
[   11.731281]  workqueue_uaf+0x26d/0x560
[   11.731421]  kunit_try_run_case+0x1a5/0x480
[   11.731564]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.731739]  kthread+0x337/0x6f0
[   11.731856]  ret_from_fork+0x41/0x80
[   11.731985]  ret_from_fork_asm+0x1a/0x30
[   11.732123] 
[   11.732191] The buggy address belongs to the object at ffff8881028bd3c0
[   11.732191]  which belongs to the cache kmalloc-32 of size 32
[   11.734493] The buggy address is located 0 bytes inside of
[   11.734493]  freed 32-byte region [ffff8881028bd3c0, ffff8881028bd3e0)
[   11.736304] 
[   11.736736] The buggy address belongs to the physical page:
[   11.737609] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1028bd
[   11.738674] flags: 0x200000000000000(node=0|zone=2)
[   11.739306] page_type: f5(slab)
[   11.739838] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   11.740789] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   11.742032] page dumped because: kasan: bad access detected
[   11.742726] 
[   11.743209] Memory state around the buggy address:
[   11.743878]  ffff8881028bd280: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   11.744645]  ffff8881028bd300: 00 00 00 fc fc fc fc fc 00 00 03 fc fc fc fc fc
[   11.745233] >ffff8881028bd380: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   11.745923]                                            ^
[   11.746649]  ffff8881028bd400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   11.747261]  ffff8881028bd480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   11.747593] ==================================================================