[   25.412296] ==================================================================
[   25.412609] BUG: KASAN: slab-use-after-free in strnlen+0x73/0x80
[   25.413783] Read of size 1 at addr ffff88810627a650 by task kunit_try_catch/307
[   25.414980] 
[   25.415368] CPU: 1 UID: 0 PID: 307 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5-next-20250708 #1 PREEMPT(voluntary) 
[   25.415606] Tainted: [B]=BAD_PAGE, [N]=TEST
[   25.415643] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   25.415668] Call Trace:
[   25.415688]  <TASK>
[   25.415710]  dump_stack_lvl+0x73/0xb0
[   25.415819]  print_report+0xd1/0x610
[   25.415847]  ? __virt_addr_valid+0x1db/0x2d0
[   25.415873]  ? strnlen+0x73/0x80
[   25.415896]  ? kasan_complete_mode_report_info+0x64/0x200
[   25.415925]  ? strnlen+0x73/0x80
[   25.415948]  kasan_report+0x141/0x180
[   25.415971]  ? strnlen+0x73/0x80
[   25.415998]  __asan_report_load1_noabort+0x18/0x20
[   25.416024]  strnlen+0x73/0x80
[   25.416047]  kasan_strings+0x615/0xe80
[   25.416069]  ? trace_hardirqs_on+0x37/0xe0
[   25.416094]  ? __pfx_kasan_strings+0x10/0x10
[   25.416116]  ? __kasan_check_write+0x18/0x20
[   25.416143]  ? queued_spin_lock_slowpath+0x116/0xb40
[   25.416165]  ? irqentry_exit+0x2a/0x60
[   25.416186]  ? sysvec_apic_timer_interrupt+0x50/0x90
[   25.416209]  ? trace_hardirqs_on+0x37/0xe0
[   25.416232]  ? __pfx_read_tsc+0x10/0x10
[   25.416269]  ? ktime_get_ts64+0x86/0x230
[   25.416297]  kunit_try_run_case+0x1a5/0x480
[   25.416320]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.416344]  ? queued_spin_lock_slowpath+0x116/0xb40
[   25.416367]  ? __kthread_parkme+0x82/0x180
[   25.416388]  ? preempt_count_sub+0x50/0x80
[   25.416412]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.416434]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.416461]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   25.416487]  kthread+0x337/0x6f0
[   25.416509]  ? trace_preempt_on+0x20/0xc0
[   25.416533]  ? __pfx_kthread+0x10/0x10
[   25.416556]  ? _raw_spin_unlock_irq+0x47/0x80
[   25.416583]  ? calculate_sigpending+0x7b/0xa0
[   25.416611]  ? __pfx_kthread+0x10/0x10
[   25.416635]  ret_from_fork+0x116/0x1d0
[   25.416655]  ? __pfx_kthread+0x10/0x10
[   25.416677]  ret_from_fork_asm+0x1a/0x30
[   25.416711]  </TASK>
[   25.416723] 
[   25.427573] Allocated by task 307:
[   25.428071]  kasan_save_stack+0x45/0x70
[   25.428510]  kasan_save_track+0x18/0x40
[   25.428997]  kasan_save_alloc_info+0x3b/0x50
[   25.429450]  __kasan_kmalloc+0xb7/0xc0
[   25.429910]  __kmalloc_cache_noprof+0x189/0x420
[   25.430219]  kasan_strings+0xc0/0xe80
[   25.430359]  kunit_try_run_case+0x1a5/0x480
[   25.430499]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.430670]  kthread+0x337/0x6f0
[   25.431031]  ret_from_fork+0x116/0x1d0
[   25.431415]  ret_from_fork_asm+0x1a/0x30
[   25.432024] 
[   25.432246] Freed by task 307:
[   25.432554]  kasan_save_stack+0x45/0x70
[   25.433021]  kasan_save_track+0x18/0x40
[   25.433414]  kasan_save_free_info+0x3f/0x60
[   25.433892]  __kasan_slab_free+0x56/0x70
[   25.434043]  kfree+0x222/0x3f0
[   25.434159]  kasan_strings+0x2aa/0xe80
[   25.434298]  kunit_try_run_case+0x1a5/0x480
[   25.434436]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.434605]  kthread+0x337/0x6f0
[   25.434721]  ret_from_fork+0x116/0x1d0
[   25.435257]  ret_from_fork_asm+0x1a/0x30
[   25.435641] 
[   25.436038] The buggy address belongs to the object at ffff88810627a640
[   25.436038]  which belongs to the cache kmalloc-32 of size 32
[   25.437219] The buggy address is located 16 bytes inside of
[   25.437219]  freed 32-byte region [ffff88810627a640, ffff88810627a660)
[   25.438381] 
[   25.438543] The buggy address belongs to the physical page:
[   25.439124] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10627a
[   25.439514] flags: 0x200000000000000(node=0|zone=2)
[   25.439679] page_type: f5(slab)
[   25.440124] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   25.440896] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   25.441555] page dumped because: kasan: bad access detected
[   25.441998] 
[   25.442069] Memory state around the buggy address:
[   25.442223]  ffff88810627a500: fa fb fb fb fc fc fc fc 00 00 07 fc fc fc fc fc
[   25.442928]  ffff88810627a580: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc
[   25.443546] >ffff88810627a600: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   25.444225]                                                  ^
[   25.444613]  ffff88810627a680: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   25.445160]  ffff88810627a700: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   25.445619] ==================================================================