[   25.788407] ==================================================================
[   25.789062] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x3e3/0x510
[   25.789968] Read of size 1 at addr ffff888105ab7000 by task kunit_try_catch/262
[   25.790895] 
[   25.791038] CPU: 0 UID: 0 PID: 262 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4-next-20250704 #1 PREEMPT(voluntary) 
[   25.791230] Tainted: [B]=BAD_PAGE, [N]=TEST
[   25.791251] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   25.791281] Call Trace:
[   25.791425]  <TASK>
[   25.791453]  dump_stack_lvl+0x73/0xb0
[   25.791496]  print_report+0xd1/0x650
[   25.791523]  ? __virt_addr_valid+0x1db/0x2d0
[   25.791553]  ? kmem_cache_rcu_uaf+0x3e3/0x510
[   25.791579]  ? kasan_complete_mode_report_info+0x64/0x200
[   25.791607]  ? kmem_cache_rcu_uaf+0x3e3/0x510
[   25.791633]  kasan_report+0x141/0x180
[   25.791657]  ? kmem_cache_rcu_uaf+0x3e3/0x510
[   25.791687]  __asan_report_load1_noabort+0x18/0x20
[   25.791713]  kmem_cache_rcu_uaf+0x3e3/0x510
[   25.791738]  ? __pfx_kmem_cache_rcu_uaf+0x10/0x10
[   25.791762]  ? finish_task_switch.isra.0+0x153/0x700
[   25.791787]  ? __switch_to+0x47/0xf50
[   25.791821]  ? __pfx_read_tsc+0x10/0x10
[   25.791846]  ? ktime_get_ts64+0x86/0x230
[   25.791876]  kunit_try_run_case+0x1a5/0x480
[   25.791906]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.791932]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   25.791961]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   25.791987]  ? __kthread_parkme+0x82/0x180
[   25.792011]  ? preempt_count_sub+0x50/0x80
[   25.792037]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.792065]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.792091]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   25.792118]  kthread+0x337/0x6f0
[   25.792140]  ? trace_preempt_on+0x20/0xc0
[   25.792169]  ? __pfx_kthread+0x10/0x10
[   25.792192]  ? _raw_spin_unlock_irq+0x47/0x80
[   25.792216]  ? calculate_sigpending+0x7b/0xa0
[   25.792250]  ? __pfx_kthread+0x10/0x10
[   25.792273]  ret_from_fork+0x116/0x1d0
[   25.792295]  ? __pfx_kthread+0x10/0x10
[   25.792318]  ret_from_fork_asm+0x1a/0x30
[   25.792352]  </TASK>
[   25.792368] 
[   25.805239] Allocated by task 262:
[   25.805785]  kasan_save_stack+0x45/0x70
[   25.806127]  kasan_save_track+0x18/0x40
[   25.806273]  kasan_save_alloc_info+0x3b/0x50
[   25.806451]  __kasan_slab_alloc+0x91/0xa0
[   25.806648]  kmem_cache_alloc_noprof+0x123/0x3f0
[   25.806811]  kmem_cache_rcu_uaf+0x155/0x510
[   25.807126]  kunit_try_run_case+0x1a5/0x480
[   25.807468]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.807741]  kthread+0x337/0x6f0
[   25.807892]  ret_from_fork+0x116/0x1d0
[   25.808112]  ret_from_fork_asm+0x1a/0x30
[   25.808414] 
[   25.808498] Freed by task 0:
[   25.808610]  kasan_save_stack+0x45/0x70
[   25.808772]  kasan_save_track+0x18/0x40
[   25.809089]  kasan_save_free_info+0x3f/0x60
[   25.809337]  __kasan_slab_free+0x56/0x70
[   25.809971]  slab_free_after_rcu_debug+0xe4/0x310
[   25.810715]  rcu_core+0x66f/0x1c40
[   25.810888]  rcu_core_si+0x12/0x20
[   25.811042]  handle_softirqs+0x209/0x730
[   25.811434]  __irq_exit_rcu+0xc9/0x110
[   25.811611]  irq_exit_rcu+0x12/0x20
[   25.811740]  sysvec_apic_timer_interrupt+0x81/0x90
[   25.811978]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   25.812325] 
[   25.812445] Last potentially related work creation:
[   25.812673]  kasan_save_stack+0x45/0x70
[   25.812853]  kasan_record_aux_stack+0xb2/0xc0
[   25.813007]  kmem_cache_free+0x131/0x420
[   25.813149]  kmem_cache_rcu_uaf+0x194/0x510
[   25.813295]  kunit_try_run_case+0x1a5/0x480
[   25.813552]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.813731]  kthread+0x337/0x6f0
[   25.813916]  ret_from_fork+0x116/0x1d0
[   25.814111]  ret_from_fork_asm+0x1a/0x30
[   25.814424] 
[   25.814799] The buggy address belongs to the object at ffff888105ab7000
[   25.814799]  which belongs to the cache test_cache of size 200
[   25.815338] The buggy address is located 0 bytes inside of
[   25.815338]  freed 200-byte region [ffff888105ab7000, ffff888105ab70c8)
[   25.816798] 
[   25.817202] The buggy address belongs to the physical page:
[   25.818692] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105ab7
[   25.820374] flags: 0x200000000000000(node=0|zone=2)
[   25.820740] page_type: f5(slab)
[   25.820896] raw: 0200000000000000 ffff888101d9e3c0 dead000000000122 0000000000000000
[   25.821150] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000
[   25.821407] page dumped because: kasan: bad access detected
[   25.821593] 
[   25.821667] Memory state around the buggy address:
[   25.821834]  ffff888105ab6f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.822065]  ffff888105ab6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.822294] >ffff888105ab7000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   25.824219]                    ^
[   25.824785]  ffff888105ab7080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
[   25.825939]  ffff888105ab7100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.827018] ==================================================================