[   19.398933] ==================================================================
[   19.399373] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8
[   19.399447] Read of size 8 at addr fff00000c3faa940 by task kunit_try_catch/203
[   19.399730] 
[   19.399777] CPU: 1 UID: 0 PID: 203 Comm: kunit_try_catch Tainted: G    B   W        N  6.15.1-rc1 #1 PREEMPT 
[   19.400860] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST
[   19.401000] Hardware name: linux,dummy-virt (DT)
[   19.401255] Call trace:
[   19.401723]  show_stack+0x20/0x38 (C)
[   19.401812]  dump_stack_lvl+0x8c/0xd0
[   19.401864]  print_report+0x118/0x608
[   19.401909]  kasan_report+0xdc/0x128
[   19.401955]  __asan_report_load8_noabort+0x20/0x30
[   19.402005]  workqueue_uaf+0x480/0x4a8
[   19.402232]  kunit_try_run_case+0x170/0x3f0
[   19.402582]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   19.402709]  kthread+0x328/0x630
[   19.402962]  ret_from_fork+0x10/0x20
[   19.403189] 
[   19.403213] Allocated by task 203:
[   19.403278]  kasan_save_stack+0x3c/0x68
[   19.403461]  kasan_save_track+0x20/0x40
[   19.403822]  kasan_save_alloc_info+0x40/0x58
[   19.403880]  __kasan_kmalloc+0xd4/0xd8
[   19.403924]  __kmalloc_cache_noprof+0x16c/0x3c0
[   19.403969]  workqueue_uaf+0x13c/0x4a8
[   19.404547]  kunit_try_run_case+0x170/0x3f0
[   19.404664]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   19.404844]  kthread+0x328/0x630
[   19.405076]  ret_from_fork+0x10/0x20
[   19.405164] 
[   19.405512] Freed by task 24:
[   19.405550]  kasan_save_stack+0x3c/0x68
[   19.405782]  kasan_save_track+0x20/0x40
[   19.405835]  kasan_save_free_info+0x4c/0x78
[   19.405877]  __kasan_slab_free+0x6c/0x98
[   19.405913]  kfree+0x214/0x3c8
[   19.405958]  workqueue_uaf_work+0x18/0x30
[   19.405998]  process_one_work+0x530/0xf98
[   19.406036]  worker_thread+0x618/0xf38
[   19.406072]  kthread+0x328/0x630
[   19.406109]  ret_from_fork+0x10/0x20
[   19.406146] 
[   19.406286] Last potentially related work creation:
[   19.406376]  kasan_save_stack+0x3c/0x68
[   19.406715]  kasan_record_aux_stack+0xb4/0xc8
[   19.406758]  __queue_work+0x65c/0x1008
[   19.406796]  queue_work_on+0xbc/0xf8
[   19.406833]  workqueue_uaf+0x210/0x4a8
[   19.406873]  kunit_try_run_case+0x170/0x3f0
[   19.406915]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   19.406962]  kthread+0x328/0x630
[   19.406998]  ret_from_fork+0x10/0x20
[   19.407434] 
[   19.407461] The buggy address belongs to the object at fff00000c3faa940
[   19.407461]  which belongs to the cache kmalloc-32 of size 32
[   19.408142] The buggy address is located 0 bytes inside of
[   19.408142]  freed 32-byte region [fff00000c3faa940, fff00000c3faa960)
[   19.408515] 
[   19.408544] The buggy address belongs to the physical page:
[   19.408661] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103faa
[   19.408766] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   19.409061] page_type: f5(slab)
[   19.409299] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000
[   19.409825] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   19.409873] page dumped because: kasan: bad access detected
[   19.410012] 
[   19.410031] Memory state around the buggy address:
[   19.410065]  fff00000c3faa800: 00 00 00 fc fc fc fc fc 00 00 03 fc fc fc fc fc
[   19.410110]  fff00000c3faa880: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc
[   19.410154] >fff00000c3faa900: 00 00 00 07 fc fc fc fc fa fb fb fb fc fc fc fc
[   19.410415]                                            ^
[   19.410835]  fff00000c3faa980: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
[   19.410909]  fff00000c3faaa00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   19.410948] ==================================================================

[   17.384357] ==================================================================
[   17.385225] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560
[   17.386121] Read of size 8 at addr ffff888102b360c0 by task kunit_try_catch/221
[   17.386358] 
[   17.386817] CPU: 0 UID: 0 PID: 221 Comm: kunit_try_catch Tainted: G    B            N  6.15.1-rc1 #1 PREEMPT(voluntary) 
[   17.386889] Tainted: [B]=BAD_PAGE, [N]=TEST
[   17.386904] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   17.386931] Call Trace:
[   17.386950]  <TASK>
[   17.386975]  dump_stack_lvl+0x73/0xb0
[   17.387094]  print_report+0xd1/0x650
[   17.387273]  ? __virt_addr_valid+0x1db/0x2d0
[   17.387313]  ? workqueue_uaf+0x4d6/0x560
[   17.387341]  ? kasan_complete_mode_report_info+0x64/0x200
[   17.387368]  ? workqueue_uaf+0x4d6/0x560
[   17.387396]  kasan_report+0x141/0x180
[   17.387423]  ? workqueue_uaf+0x4d6/0x560
[   17.387454]  __asan_report_load8_noabort+0x18/0x20
[   17.387478]  workqueue_uaf+0x4d6/0x560
[   17.387504]  ? __pfx_workqueue_uaf+0x10/0x10
[   17.387531]  ? __schedule+0x10cc/0x2b30
[   17.387558]  ? __pfx_read_tsc+0x10/0x10
[   17.387581]  ? ktime_get_ts64+0x86/0x230
[   17.387612]  kunit_try_run_case+0x1a5/0x480
[   17.387703]  ? __pfx_kunit_try_run_case+0x10/0x10
[   17.387729]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   17.387781]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   17.387810]  ? __kthread_parkme+0x82/0x180
[   17.387837]  ? preempt_count_sub+0x50/0x80
[   17.387868]  ? __pfx_kunit_try_run_case+0x10/0x10
[   17.387897]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   17.387924]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   17.387950]  kthread+0x337/0x6f0
[   17.387969]  ? trace_preempt_on+0x20/0xc0
[   17.387998]  ? __pfx_kthread+0x10/0x10
[   17.388019]  ? _raw_spin_unlock_irq+0x47/0x80
[   17.388044]  ? calculate_sigpending+0x7b/0xa0
[   17.388069]  ? __pfx_kthread+0x10/0x10
[   17.388091]  ret_from_fork+0x41/0x80
[   17.388143]  ? __pfx_kthread+0x10/0x10
[   17.388167]  ret_from_fork_asm+0x1a/0x30
[   17.388562]  </TASK>
[   17.388580] 
[   17.397614] Allocated by task 221:
[   17.398268]  kasan_save_stack+0x45/0x70
[   17.398611]  kasan_save_track+0x18/0x40
[   17.398909]  kasan_save_alloc_info+0x3b/0x50
[   17.399254]  __kasan_kmalloc+0xb7/0xc0
[   17.399378]  __kmalloc_cache_noprof+0x189/0x420
[   17.399743]  workqueue_uaf+0x152/0x560
[   17.400064]  kunit_try_run_case+0x1a5/0x480
[   17.400536]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   17.400890]  kthread+0x337/0x6f0
[   17.401087]  ret_from_fork+0x41/0x80
[   17.401428]  ret_from_fork_asm+0x1a/0x30
[   17.401702] 
[   17.401818] Freed by task 91:
[   17.401951]  kasan_save_stack+0x45/0x70
[   17.402320]  kasan_save_track+0x18/0x40
[   17.402618]  kasan_save_free_info+0x3f/0x60
[   17.402914]  __kasan_slab_free+0x56/0x70
[   17.403128]  kfree+0x222/0x3f0
[   17.403419]  workqueue_uaf_work+0x12/0x20
[   17.403556]  process_one_work+0x5ee/0xf60
[   17.403858]  worker_thread+0x758/0x1220
[   17.404059]  kthread+0x337/0x6f0
[   17.404634]  ret_from_fork+0x41/0x80
[   17.404864]  ret_from_fork_asm+0x1a/0x30
[   17.405042] 
[   17.405181] Last potentially related work creation:
[   17.405329]  kasan_save_stack+0x45/0x70
[   17.405680]  kasan_record_aux_stack+0xb2/0xc0
[   17.405948]  __queue_work+0x626/0xeb0
[   17.406149]  queue_work_on+0xb6/0xc0
[   17.406478]  workqueue_uaf+0x26d/0x560
[   17.406619]  kunit_try_run_case+0x1a5/0x480
[   17.406885]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   17.407097]  kthread+0x337/0x6f0
[   17.407374]  ret_from_fork+0x41/0x80
[   17.407579]  ret_from_fork_asm+0x1a/0x30
[   17.407774] 
[   17.407844] The buggy address belongs to the object at ffff888102b360c0
[   17.407844]  which belongs to the cache kmalloc-32 of size 32
[   17.408778] The buggy address is located 0 bytes inside of
[   17.408778]  freed 32-byte region [ffff888102b360c0, ffff888102b360e0)
[   17.409260] 
[   17.409419] The buggy address belongs to the physical page:
[   17.409629] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102b36
[   17.410126] flags: 0x200000000000000(node=0|zone=2)
[   17.410511] page_type: f5(slab)
[   17.410682] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   17.411026] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   17.411425] page dumped because: kasan: bad access detected
[   17.411704] 
[   17.411845] Memory state around the buggy address:
[   17.411984]  ffff888102b35f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   17.412607]  ffff888102b36000: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc
[   17.412874] >ffff888102b36080: 00 00 00 07 fc fc fc fc fa fb fb fb fc fc fc fc
[   17.413312]                                            ^
[   17.413605]  ffff888102b36100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   17.413998]  ffff888102b36180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   17.414289] ==================================================================