[   18.754817] ==================================================================
[   18.755828] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x3e5/0x510
[   18.756576] Read of size 1 at addr ffff888102cae000 by task kunit_try_catch/221
[   18.757003] 
[   18.757189] CPU: 0 UID: 0 PID: 221 Comm: kunit_try_catch Tainted: G    B            N 6.14.11-rc1 #1
[   18.757296] Tainted: [B]=BAD_PAGE, [N]=TEST
[   18.757328] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   18.757371] Call Trace:
[   18.757406]  <TASK>
[   18.757447]  dump_stack_lvl+0x73/0xb0
[   18.757528]  print_report+0xd1/0x650
[   18.757583]  ? __virt_addr_valid+0x1db/0x2d0
[   18.757642]  ? kmem_cache_rcu_uaf+0x3e5/0x510
[   18.757698]  ? kasan_complete_mode_report_info+0x64/0x200
[   18.757753]  ? kmem_cache_rcu_uaf+0x3e5/0x510
[   18.757798]  kasan_report+0x140/0x180
[   18.757847]  ? kmem_cache_rcu_uaf+0x3e5/0x510
[   18.758022]  __asan_report_load1_noabort+0x18/0x20
[   18.758078]  kmem_cache_rcu_uaf+0x3e5/0x510
[   18.758133]  ? __pfx_kmem_cache_rcu_uaf+0x10/0x10
[   18.758187]  ? sysvec_apic_timer_interrupt+0x50/0x90
[   18.758265]  ? __pfx_kmem_cache_rcu_uaf+0x10/0x10
[   18.758344]  kunit_try_run_case+0x1a6/0x480
[   18.758410]  ? __pfx_kunit_try_run_case+0x10/0x10
[   18.758465]  ? _raw_spin_lock_irqsave+0xa2/0x110
[   18.758527]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   18.758587]  ? __kthread_parkme+0x82/0x160
[   18.758648]  ? preempt_count_sub+0x50/0x80
[   18.758711]  ? __pfx_kunit_try_run_case+0x10/0x10
[   18.758760]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   18.758816]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   18.758876]  kthread+0x324/0x6e0
[   18.758909]  ? trace_preempt_on+0x20/0xc0
[   18.758942]  ? __pfx_kthread+0x10/0x10
[   18.758970]  ? _raw_spin_unlock_irq+0x47/0x80
[   18.758998]  ? calculate_sigpending+0x7b/0xa0
[   18.759026]  ? __pfx_kthread+0x10/0x10
[   18.759054]  ret_from_fork+0x41/0x80
[   18.759079]  ? __pfx_kthread+0x10/0x10
[   18.759106]  ret_from_fork_asm+0x1a/0x30
[   18.759147]  </TASK>
[   18.759162] 
[   18.772978] Allocated by task 221:
[   18.773292]  kasan_save_stack+0x45/0x70
[   18.773564]  kasan_save_track+0x18/0x40
[   18.773965]  kasan_save_alloc_info+0x3b/0x50
[   18.774302]  __kasan_slab_alloc+0x91/0xa0
[   18.774592]  kmem_cache_alloc_noprof+0x124/0x400
[   18.775038]  kmem_cache_rcu_uaf+0x156/0x510
[   18.775339]  kunit_try_run_case+0x1a6/0x480
[   18.776007]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   18.777568]  kthread+0x324/0x6e0
[   18.777964]  ret_from_fork+0x41/0x80
[   18.778227]  ret_from_fork_asm+0x1a/0x30
[   18.778750] 
[   18.778923] Freed by task 0:
[   18.779115]  kasan_save_stack+0x45/0x70
[   18.779647]  kasan_save_track+0x18/0x40
[   18.780057]  kasan_save_free_info+0x3f/0x60
[   18.780573]  __kasan_slab_free+0x56/0x70
[   18.780900]  slab_free_after_rcu_debug+0xe4/0x310
[   18.781356]  rcu_core+0x680/0x1d70
[   18.782497]  rcu_core_si+0x12/0x20
[   18.782786]  handle_softirqs+0x209/0x730
[   18.783282]  __irq_exit_rcu+0xc9/0x110
[   18.783842]  irq_exit_rcu+0x12/0x20
[   18.784230]  sysvec_apic_timer_interrupt+0x81/0x90
[   18.784739]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   18.785209] 
[   18.785584] Last potentially related work creation:
[   18.785965]  kasan_save_stack+0x45/0x70
[   18.786356]  kasan_record_aux_stack+0xb2/0xc0
[   18.786631]  kmem_cache_free+0x132/0x420
[   18.787046]  kmem_cache_rcu_uaf+0x195/0x510
[   18.787440]  kunit_try_run_case+0x1a6/0x480
[   18.787710]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   18.788214]  kthread+0x324/0x6e0
[   18.788553]  ret_from_fork+0x41/0x80
[   18.789970]  ret_from_fork_asm+0x1a/0x30
[   18.790188] 
[   18.790386] The buggy address belongs to the object at ffff888102cae000
[   18.790386]  which belongs to the cache test_cache of size 200
[   18.791596] The buggy address is located 0 bytes inside of
[   18.791596]  freed 200-byte region [ffff888102cae000, ffff888102cae0c8)
[   18.792407] 
[   18.792762] The buggy address belongs to the physical page:
[   18.793143] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102cae
[   18.794378] flags: 0x200000000000000(node=0|zone=2)
[   18.794810] page_type: f5(slab)
[   18.795346] raw: 0200000000000000 ffff8881003b1280 dead000000000122 0000000000000000
[   18.795819] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000
[   18.796412] page dumped because: kasan: bad access detected
[   18.796791] 
[   18.797146] Memory state around the buggy address:
[   18.797711]  ffff888102cadf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.798219]  ffff888102cadf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.798873] >ffff888102cae000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   18.799276]                    ^
[   18.800395]  ffff888102cae080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
[   18.800775]  ffff888102cae100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.801222] ==================================================================