[   27.633022] ==================================================================
[   27.633774] BUG: KASAN: slab-use-after-free in strnlen+0x73/0x80
[   27.634536] Read of size 1 at addr ffff88810618c690 by task kunit_try_catch/308
[   27.635222] 
[   27.635369] CPU: 0 UID: 0 PID: 308 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6-next-20250717 #1 PREEMPT(voluntary) 
[   27.635429] Tainted: [B]=BAD_PAGE, [N]=TEST
[   27.635441] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   27.635463] Call Trace:
[   27.635478]  <TASK>
[   27.635494]  dump_stack_lvl+0x73/0xb0
[   27.635523]  print_report+0xd1/0x610
[   27.635545]  ? __virt_addr_valid+0x1db/0x2d0
[   27.635567]  ? strnlen+0x73/0x80
[   27.635585]  ? kasan_complete_mode_report_info+0x64/0x200
[   27.635610]  ? strnlen+0x73/0x80
[   27.635627]  kasan_report+0x141/0x180
[   27.635649]  ? strnlen+0x73/0x80
[   27.635671]  __asan_report_load1_noabort+0x18/0x20
[   27.635694]  strnlen+0x73/0x80
[   27.635713]  kasan_strings+0x615/0xe80
[   27.635731]  ? trace_hardirqs_on+0x37/0xe0
[   27.635755]  ? __pfx_kasan_strings+0x10/0x10
[   27.635775]  ? finish_task_switch.isra.0+0x153/0x700
[   27.635795]  ? __switch_to+0x47/0xf80
[   27.635820]  ? __schedule+0x10c6/0x2b60
[   27.635842]  ? __pfx_read_tsc+0x10/0x10
[   27.635862]  ? ktime_get_ts64+0x86/0x230
[   27.635886]  kunit_try_run_case+0x1a5/0x480
[   27.635909]  ? __pfx_kunit_try_run_case+0x10/0x10
[   27.635932]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   27.635954]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   27.635976]  ? __kthread_parkme+0x82/0x180
[   27.635999]  ? preempt_count_sub+0x50/0x80
[   27.636021]  ? __pfx_kunit_try_run_case+0x10/0x10
[   27.636044]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   27.636066]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   27.636100]  kthread+0x337/0x6f0
[   27.636119]  ? trace_preempt_on+0x20/0xc0
[   27.636141]  ? __pfx_kthread+0x10/0x10
[   27.636160]  ? _raw_spin_unlock_irq+0x47/0x80
[   27.636181]  ? calculate_sigpending+0x7b/0xa0
[   27.636204]  ? __pfx_kthread+0x10/0x10
[   27.636225]  ret_from_fork+0x116/0x1d0
[   27.636269]  ? __pfx_kthread+0x10/0x10
[   27.636300]  ret_from_fork_asm+0x1a/0x30
[   27.636355]  </TASK>
[   27.636366] 
[   27.646621] Allocated by task 308:
[   27.646934]  kasan_save_stack+0x45/0x70
[   27.647383]  kasan_save_track+0x18/0x40
[   27.647757]  kasan_save_alloc_info+0x3b/0x50
[   27.648153]  __kasan_kmalloc+0xb7/0xc0
[   27.648511]  __kmalloc_cache_noprof+0x189/0x420
[   27.648810]  kasan_strings+0xc0/0xe80
[   27.648936]  kunit_try_run_case+0x1a5/0x480
[   27.649069]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   27.649245]  kthread+0x337/0x6f0
[   27.649649]  ret_from_fork+0x116/0x1d0
[   27.650010]  ret_from_fork_asm+0x1a/0x30
[   27.650470] 
[   27.650644] Freed by task 308:
[   27.650935]  kasan_save_stack+0x45/0x70
[   27.651351]  kasan_save_track+0x18/0x40
[   27.651845]  kasan_save_free_info+0x3f/0x60
[   27.652261]  __kasan_slab_free+0x56/0x70
[   27.652735]  kfree+0x222/0x3f0
[   27.652851]  kasan_strings+0x2aa/0xe80
[   27.652972]  kunit_try_run_case+0x1a5/0x480
[   27.653117]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   27.653647]  kthread+0x337/0x6f0
[   27.654010]  ret_from_fork+0x116/0x1d0
[   27.654473]  ret_from_fork_asm+0x1a/0x30
[   27.654848] 
[   27.654999] The buggy address belongs to the object at ffff88810618c680
[   27.654999]  which belongs to the cache kmalloc-32 of size 32
[   27.656200] The buggy address is located 16 bytes inside of
[   27.656200]  freed 32-byte region [ffff88810618c680, ffff88810618c6a0)
[   27.657185] 
[   27.657400] The buggy address belongs to the physical page:
[   27.657565] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10618c
[   27.657801] flags: 0x200000000000000(node=0|zone=2)
[   27.657962] page_type: f5(slab)
[   27.658075] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   27.658353] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   27.658857] page dumped because: kasan: bad access detected
[   27.659089] 
[   27.659155] Memory state around the buggy address:
[   27.659298]  ffff88810618c580: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc
[   27.659503]  ffff88810618c600: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc
[   27.659701] >ffff88810618c680: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   27.659901]                          ^
[   27.660018]  ffff88810618c700: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
[   27.660226]  ffff88810618c780: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   27.660423] ==================================================================