[   23.757171] ==================================================================
[   23.758540] BUG: KASAN: slab-use-after-free in kmalloc_uaf_16+0x47b/0x4c0
[   23.759222] Read of size 16 at addr ffff888104c83b40 by task kunit_try_catch/218
[   23.759936] 
[   23.760139] CPU: 0 UID: 0 PID: 218 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5-next-20250711 #1 PREEMPT(voluntary) 
[   23.760194] Tainted: [B]=BAD_PAGE, [N]=TEST
[   23.760206] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   23.760229] Call Trace:
[   23.760242]  <TASK>
[   23.760261]  dump_stack_lvl+0x73/0xb0
[   23.760295]  print_report+0xd1/0x610
[   23.760323]  ? __virt_addr_valid+0x1db/0x2d0
[   23.760410]  ? kmalloc_uaf_16+0x47b/0x4c0
[   23.760444]  ? kasan_complete_mode_report_info+0x64/0x200
[   23.760470]  ? kmalloc_uaf_16+0x47b/0x4c0
[   23.760490]  kasan_report+0x141/0x180
[   23.760512]  ? kmalloc_uaf_16+0x47b/0x4c0
[   23.760537]  __asan_report_load16_noabort+0x18/0x20
[   23.760560]  kmalloc_uaf_16+0x47b/0x4c0
[   23.760580]  ? __pfx_kmalloc_uaf_16+0x10/0x10
[   23.760601]  ? __schedule+0x10cc/0x2b60
[   23.760627]  ? __pfx_read_tsc+0x10/0x10
[   23.760649]  ? ktime_get_ts64+0x86/0x230
[   23.760674]  kunit_try_run_case+0x1a5/0x480
[   23.760697]  ? __pfx_kunit_try_run_case+0x10/0x10
[   23.760717]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   23.760753]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   23.760776]  ? __kthread_parkme+0x82/0x180
[   23.760797]  ? preempt_count_sub+0x50/0x80
[   23.760820]  ? __pfx_kunit_try_run_case+0x10/0x10
[   23.760841]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   23.760865]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   23.760891]  kthread+0x337/0x6f0
[   23.760911]  ? trace_preempt_on+0x20/0xc0
[   23.760934]  ? __pfx_kthread+0x10/0x10
[   23.760954]  ? _raw_spin_unlock_irq+0x47/0x80
[   23.760976]  ? calculate_sigpending+0x7b/0xa0
[   23.761000]  ? __pfx_kthread+0x10/0x10
[   23.761022]  ret_from_fork+0x116/0x1d0
[   23.761040]  ? __pfx_kthread+0x10/0x10
[   23.761061]  ret_from_fork_asm+0x1a/0x30
[   23.761092]  </TASK>
[   23.761103] 
[   23.773503] Allocated by task 218:
[   23.774225]  kasan_save_stack+0x45/0x70
[   23.774759]  kasan_save_track+0x18/0x40
[   23.775238]  kasan_save_alloc_info+0x3b/0x50
[   23.775812]  __kasan_kmalloc+0xb7/0xc0
[   23.775953]  __kmalloc_cache_noprof+0x189/0x420
[   23.776104]  kmalloc_uaf_16+0x15b/0x4c0
[   23.776233]  kunit_try_run_case+0x1a5/0x480
[   23.776963]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   23.777611]  kthread+0x337/0x6f0
[   23.778068]  ret_from_fork+0x116/0x1d0
[   23.778641]  ret_from_fork_asm+0x1a/0x30
[   23.779121] 
[   23.779264] Freed by task 218:
[   23.779542]  kasan_save_stack+0x45/0x70
[   23.780135]  kasan_save_track+0x18/0x40
[   23.780294]  kasan_save_free_info+0x3f/0x60
[   23.781001]  __kasan_slab_free+0x56/0x70
[   23.781435]  kfree+0x222/0x3f0
[   23.781581]  kmalloc_uaf_16+0x1d6/0x4c0
[   23.781987]  kunit_try_run_case+0x1a5/0x480
[   23.782552]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   23.782966]  kthread+0x337/0x6f0
[   23.783095]  ret_from_fork+0x116/0x1d0
[   23.783223]  ret_from_fork_asm+0x1a/0x30
[   23.783431] 
[   23.783860] The buggy address belongs to the object at ffff888104c83b40
[   23.783860]  which belongs to the cache kmalloc-16 of size 16
[   23.785379] The buggy address is located 0 bytes inside of
[   23.785379]  freed 16-byte region [ffff888104c83b40, ffff888104c83b50)
[   23.786492] 
[   23.786677] The buggy address belongs to the physical page:
[   23.786869] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x104c83
[   23.787105] flags: 0x200000000000000(node=0|zone=2)
[   23.787318] page_type: f5(slab)
[   23.787896] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000
[   23.788708] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000
[   23.789538] page dumped because: kasan: bad access detected
[   23.790276] 
[   23.790579] Memory state around the buggy address:
[   23.791104]  ffff888104c83a00: fa fb fc fc fa fb fc fc fa fb fc fc 00 04 fc fc
[   23.791610]  ffff888104c83a80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   23.792470] >ffff888104c83b00: fa fb fc fc 00 00 fc fc fa fb fc fc fc fc fc fc
[   23.792947]                                            ^
[   23.793121]  ffff888104c83b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   23.793742]  ffff888104c83c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   23.794462] ==================================================================