[   13.088015] ==================================================================
[   13.088595] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x3e3/0x510
[   13.088962] Read of size 1 at addr ffff8881026c1000 by task kunit_try_catch/230
[   13.089428] 
[   13.089551] CPU: 1 UID: 0 PID: 230 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6 #1 PREEMPT(voluntary) 
[   13.089599] Tainted: [B]=BAD_PAGE, [N]=TEST
[   13.089611] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   13.089633] Call Trace:
[   13.089646]  <TASK>
[   13.089665]  dump_stack_lvl+0x73/0xb0
[   13.089697]  print_report+0xd1/0x610
[   13.089720]  ? __virt_addr_valid+0x1db/0x2d0
[   13.089744]  ? kmem_cache_rcu_uaf+0x3e3/0x510
[   13.089766]  ? kasan_complete_mode_report_info+0x64/0x200
[   13.089789]  ? kmem_cache_rcu_uaf+0x3e3/0x510
[   13.089812]  kasan_report+0x141/0x180
[   13.089833]  ? kmem_cache_rcu_uaf+0x3e3/0x510
[   13.089898]  __asan_report_load1_noabort+0x18/0x20
[   13.089922]  kmem_cache_rcu_uaf+0x3e3/0x510
[   13.089957]  ? __pfx_kmem_cache_rcu_uaf+0x10/0x10
[   13.089979]  ? finish_task_switch.isra.0+0x153/0x700
[   13.090003]  ? __switch_to+0x47/0xf50
[   13.090034]  ? __pfx_read_tsc+0x10/0x10
[   13.090062]  ? ktime_get_ts64+0x86/0x230
[   13.090087]  kunit_try_run_case+0x1a5/0x480
[   13.090114]  ? __pfx_kunit_try_run_case+0x10/0x10
[   13.090135]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   13.090160]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   13.090182]  ? __kthread_parkme+0x82/0x180
[   13.090203]  ? preempt_count_sub+0x50/0x80
[   13.090230]  ? __pfx_kunit_try_run_case+0x10/0x10
[   13.090254]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.090277]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   13.090300]  kthread+0x337/0x6f0
[   13.090319]  ? trace_preempt_on+0x20/0xc0
[   13.090342]  ? __pfx_kthread+0x10/0x10
[   13.090361]  ? _raw_spin_unlock_irq+0x47/0x80
[   13.090405]  ? calculate_sigpending+0x7b/0xa0
[   13.090430]  ? __pfx_kthread+0x10/0x10
[   13.090450]  ret_from_fork+0x116/0x1d0
[   13.090480]  ? __pfx_kthread+0x10/0x10
[   13.090499]  ret_from_fork_asm+0x1a/0x30
[   13.090552]  </TASK>
[   13.090562] 
[   13.099114] Allocated by task 230:
[   13.099255]  kasan_save_stack+0x45/0x70
[   13.099403]  kasan_save_track+0x18/0x40
[   13.099539]  kasan_save_alloc_info+0x3b/0x50
[   13.099749]  __kasan_slab_alloc+0x91/0xa0
[   13.099952]  kmem_cache_alloc_noprof+0x123/0x3f0
[   13.100305]  kmem_cache_rcu_uaf+0x155/0x510
[   13.100544]  kunit_try_run_case+0x1a5/0x480
[   13.100756]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.101180]  kthread+0x337/0x6f0
[   13.101345]  ret_from_fork+0x116/0x1d0
[   13.101524]  ret_from_fork_asm+0x1a/0x30
[   13.101958] 
[   13.102067] Freed by task 0:
[   13.102187]  kasan_save_stack+0x45/0x70
[   13.102395]  kasan_save_track+0x18/0x40
[   13.102566]  kasan_save_free_info+0x3f/0x60
[   13.103695]  __kasan_slab_free+0x56/0x70
[   13.103869]  slab_free_after_rcu_debug+0xe4/0x310
[   13.104033]  rcu_core+0x66f/0x1c40
[   13.104173]  rcu_core_si+0x12/0x20
[   13.104297]  handle_softirqs+0x209/0x730
[   13.104437]  __irq_exit_rcu+0xc9/0x110
[   13.104569]  irq_exit_rcu+0x12/0x20
[   13.104695]  sysvec_apic_timer_interrupt+0x81/0x90
[   13.104858]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   13.105028] 
[   13.105111] Last potentially related work creation:
[   13.105267]  kasan_save_stack+0x45/0x70
[   13.105698]  kasan_record_aux_stack+0xb2/0xc0
[   13.105852]  kmem_cache_free+0x131/0x420
[   13.105989]  kmem_cache_rcu_uaf+0x194/0x510
[   13.106371]  kunit_try_run_case+0x1a5/0x480
[   13.106906]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.107372]  kthread+0x337/0x6f0
[   13.107680]  ret_from_fork+0x116/0x1d0
[   13.108191]  ret_from_fork_asm+0x1a/0x30
[   13.108610] 
[   13.108869] The buggy address belongs to the object at ffff8881026c1000
[   13.108869]  which belongs to the cache test_cache of size 200
[   13.110172] The buggy address is located 0 bytes inside of
[   13.110172]  freed 200-byte region [ffff8881026c1000, ffff8881026c10c8)
[   13.111364] 
[   13.111529] The buggy address belongs to the physical page:
[   13.112106] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1026c1
[   13.113090] flags: 0x200000000000000(node=0|zone=2)
[   13.113618] page_type: f5(slab)
[   13.113934] raw: 0200000000000000 ffff8881010b4780 dead000000000122 0000000000000000
[   13.114831] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000
[   13.115690] page dumped because: kasan: bad access detected
[   13.116379] 
[   13.116569] Memory state around the buggy address:
[   13.117162]  ffff8881026c0f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   13.117858]  ffff8881026c0f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   13.118486] >ffff8881026c1000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   13.119246]                    ^
[   13.119494]  ffff8881026c1080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
[   13.119798]  ffff8881026c1100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   13.120567] ==================================================================