[   13.190605] ==================================================================
[   13.191772] BUG: KASAN: slab-use-after-free in strnlen+0x73/0x80
[   13.192005] Read of size 1 at addr ffff88810314dfd0 by task kunit_try_catch/278
[   13.192244] 
[   13.192975] CPU: 0 UID: 0 PID: 278 Comm: kunit_try_catch Tainted: G    B            N  6.15.5-rc1 #1 PREEMPT(voluntary) 
[   13.193075] Tainted: [B]=BAD_PAGE, [N]=TEST
[   13.193090] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   13.193113] Call Trace:
[   13.193133]  <TASK>
[   13.193152]  dump_stack_lvl+0x73/0xb0
[   13.193181]  print_report+0xd1/0x650
[   13.193206]  ? __virt_addr_valid+0x1db/0x2d0
[   13.193238]  ? strnlen+0x73/0x80
[   13.193258]  ? kasan_complete_mode_report_info+0x64/0x200
[   13.193282]  ? strnlen+0x73/0x80
[   13.193300]  kasan_report+0x141/0x180
[   13.193324]  ? strnlen+0x73/0x80
[   13.193348]  __asan_report_load1_noabort+0x18/0x20
[   13.193369]  strnlen+0x73/0x80
[   13.193389]  kasan_strings+0x615/0xe80
[   13.193409]  ? trace_hardirqs_on+0x37/0xe0
[   13.193432]  ? __pfx_kasan_strings+0x10/0x10
[   13.193453]  ? finish_task_switch.isra.0+0x153/0x700
[   13.193477]  ? __switch_to+0x5d9/0xf60
[   13.193497]  ? dequeue_task_fair+0x166/0x4e0
[   13.193520]  ? __schedule+0x10cc/0x2b60
[   13.193544]  ? __pfx_read_tsc+0x10/0x10
[   13.193570]  ? ktime_get_ts64+0x86/0x230
[   13.193596]  kunit_try_run_case+0x1a5/0x480
[   13.193620]  ? __pfx_kunit_try_run_case+0x10/0x10
[   13.193664]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   13.193688]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   13.193712]  ? __kthread_parkme+0x82/0x180
[   13.193734]  ? preempt_count_sub+0x50/0x80
[   13.193758]  ? __pfx_kunit_try_run_case+0x10/0x10
[   13.193781]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.193804]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   13.193827]  kthread+0x337/0x6f0
[   13.193844]  ? trace_preempt_on+0x20/0xc0
[   13.193866]  ? __pfx_kthread+0x10/0x10
[   13.193884]  ? _raw_spin_unlock_irq+0x47/0x80
[   13.193905]  ? calculate_sigpending+0x7b/0xa0
[   13.193927]  ? __pfx_kthread+0x10/0x10
[   13.193945]  ret_from_fork+0x41/0x80
[   13.193966]  ? __pfx_kthread+0x10/0x10
[   13.193984]  ret_from_fork_asm+0x1a/0x30
[   13.194015]  </TASK>
[   13.194026] 
[   13.207509] Allocated by task 278:
[   13.207924]  kasan_save_stack+0x45/0x70
[   13.208368]  kasan_save_track+0x18/0x40
[   13.208725]  kasan_save_alloc_info+0x3b/0x50
[   13.208871]  __kasan_kmalloc+0xb7/0xc0
[   13.209000]  __kmalloc_cache_noprof+0x189/0x420
[   13.209151]  kasan_strings+0xc0/0xe80
[   13.209300]  kunit_try_run_case+0x1a5/0x480
[   13.209553]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.209860]  kthread+0x337/0x6f0
[   13.210050]  ret_from_fork+0x41/0x80
[   13.210183]  ret_from_fork_asm+0x1a/0x30
[   13.210390] 
[   13.210519] Freed by task 278:
[   13.210719]  kasan_save_stack+0x45/0x70
[   13.210914]  kasan_save_track+0x18/0x40
[   13.211171]  kasan_save_free_info+0x3f/0x60
[   13.211370]  __kasan_slab_free+0x56/0x70
[   13.211611]  kfree+0x222/0x3f0
[   13.211805]  kasan_strings+0x2aa/0xe80
[   13.212004]  kunit_try_run_case+0x1a5/0x480
[   13.212216]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.212429]  kthread+0x337/0x6f0
[   13.212548]  ret_from_fork+0x41/0x80
[   13.212740]  ret_from_fork_asm+0x1a/0x30
[   13.212944] 
[   13.213040] The buggy address belongs to the object at ffff88810314dfc0
[   13.213040]  which belongs to the cache kmalloc-32 of size 32
[   13.213478] The buggy address is located 16 bytes inside of
[   13.213478]  freed 32-byte region [ffff88810314dfc0, ffff88810314dfe0)
[   13.213899] 
[   13.214001] The buggy address belongs to the physical page:
[   13.214276] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10314d
[   13.214667] flags: 0x200000000000000(node=0|zone=2)
[   13.214947] page_type: f5(slab)
[   13.215143] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   13.215432] raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
[   13.215712] page dumped because: kasan: bad access detected
[   13.215991] 
[   13.216102] Memory state around the buggy address:
[   13.216350]  ffff88810314de80: 00 00 00 fc fc fc fc fc 00 00 00 04 fc fc fc fc
[   13.216659]  ffff88810314df00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   13.216933] >ffff88810314df80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   13.217220]                                                  ^
[   13.217451]  ffff88810314e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   13.217816]  ffff88810314e080: fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb
[   13.218113] ==================================================================