[   14.044171] ==================================================================
[   14.044681] BUG: KASAN: slab-use-after-free in strnlen+0x73/0x80
[   14.045337] Read of size 1 at addr ffff8881039efb10 by task kunit_try_catch/279
[   14.046452] 
[   14.046657] CPU: 0 UID: 0 PID: 279 Comm: kunit_try_catch Tainted: G    B            N  6.15.4-rc2 #1 PREEMPT(voluntary) 
[   14.046769] Tainted: [B]=BAD_PAGE, [N]=TEST
[   14.046796] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   14.046837] Call Trace:
[   14.046875]  <TASK>
[   14.046913]  dump_stack_lvl+0x73/0xb0
[   14.046974]  print_report+0xd1/0x650
[   14.047024]  ? __virt_addr_valid+0x1db/0x2d0
[   14.047068]  ? strnlen+0x73/0x80
[   14.047098]  ? kasan_complete_mode_report_info+0x64/0x200
[   14.047123]  ? strnlen+0x73/0x80
[   14.047142]  kasan_report+0x141/0x180
[   14.047163]  ? strnlen+0x73/0x80
[   14.047184]  __asan_report_load1_noabort+0x18/0x20
[   14.047205]  strnlen+0x73/0x80
[   14.047223]  kasan_strings+0x615/0xe80
[   14.047243]  ? trace_hardirqs_on+0x37/0xe0
[   14.047265]  ? __pfx_kasan_strings+0x10/0x10
[   14.047285]  ? finish_task_switch.isra.0+0x153/0x700
[   14.047309]  ? __switch_to+0x5d9/0xf60
[   14.047329]  ? dequeue_task_fair+0x166/0x4e0
[   14.047352]  ? __schedule+0x10cc/0x2b60
[   14.047375]  ? __pfx_read_tsc+0x10/0x10
[   14.047394]  ? ktime_get_ts64+0x86/0x230
[   14.047420]  kunit_try_run_case+0x1a5/0x480
[   14.047443]  ? __pfx_kunit_try_run_case+0x10/0x10
[   14.047464]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   14.047487]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   14.047509]  ? __kthread_parkme+0x82/0x180
[   14.047531]  ? preempt_count_sub+0x50/0x80
[   14.047578]  ? __pfx_kunit_try_run_case+0x10/0x10
[   14.047602]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   14.047641]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   14.047667]  kthread+0x337/0x6f0
[   14.047684]  ? trace_preempt_on+0x20/0xc0
[   14.047705]  ? __pfx_kthread+0x10/0x10
[   14.047722]  ? _raw_spin_unlock_irq+0x47/0x80
[   14.047743]  ? calculate_sigpending+0x7b/0xa0
[   14.047764]  ? __pfx_kthread+0x10/0x10
[   14.047782]  ret_from_fork+0x41/0x80
[   14.047801]  ? __pfx_kthread+0x10/0x10
[   14.047818]  ret_from_fork_asm+0x1a/0x30
[   14.047849]  </TASK>
[   14.047860] 
[   14.055980] Allocated by task 279:
[   14.056322]  kasan_save_stack+0x45/0x70
[   14.056665]  kasan_save_track+0x18/0x40
[   14.056955]  kasan_save_alloc_info+0x3b/0x50
[   14.057272]  __kasan_kmalloc+0xb7/0xc0
[   14.057608]  __kmalloc_cache_noprof+0x189/0x420
[   14.057989]  kasan_strings+0xc0/0xe80
[   14.058270]  kunit_try_run_case+0x1a5/0x480
[   14.058513]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   14.058865]  kthread+0x337/0x6f0
[   14.059053]  ret_from_fork+0x41/0x80
[   14.059245]  ret_from_fork_asm+0x1a/0x30
[   14.059439] 
[   14.059582] Freed by task 279:
[   14.059775]  kasan_save_stack+0x45/0x70
[   14.059969]  kasan_save_track+0x18/0x40
[   14.060159]  kasan_save_free_info+0x3f/0x60
[   14.060480]  __kasan_slab_free+0x56/0x70
[   14.060815]  kfree+0x222/0x3f0
[   14.061075]  kasan_strings+0x2aa/0xe80
[   14.061376]  kunit_try_run_case+0x1a5/0x480
[   14.061740]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   14.062128]  kthread+0x337/0x6f0
[   14.062396]  ret_from_fork+0x41/0x80
[   14.062716]  ret_from_fork_asm+0x1a/0x30
[   14.063014] 
[   14.063174] The buggy address belongs to the object at ffff8881039efb00
[   14.063174]  which belongs to the cache kmalloc-32 of size 32
[   14.064060] The buggy address is located 16 bytes inside of
[   14.064060]  freed 32-byte region [ffff8881039efb00, ffff8881039efb20)
[   14.064591] 
[   14.064771] The buggy address belongs to the physical page:
[   14.065175] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1039ef
[   14.065576] flags: 0x200000000000000(node=0|zone=2)
[   14.065804] page_type: f5(slab)
[   14.065986] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   14.066409] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   14.066942] page dumped because: kasan: bad access detected
[   14.067330] 
[   14.067479] Memory state around the buggy address:
[   14.067873]  ffff8881039efa00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   14.068352]  ffff8881039efa80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   14.068788] >ffff8881039efb00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   14.069153]                          ^
[   14.069386]  ffff8881039efb80: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
[   14.069787]  ffff8881039efc00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   14.070039] ==================================================================