[   25.352050] ==================================================================
[   25.353488] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x320/0x380
[   25.353814] Read of size 1 at addr ffff888104919c48 by task kunit_try_catch/232
[   25.355739] 
[   25.355853] CPU: 0 UID: 0 PID: 232 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc7-next-20250722 #1 PREEMPT(voluntary) 
[   25.355905] Tainted: [B]=BAD_PAGE, [N]=TEST
[   25.355918] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   25.355940] Call Trace:
[   25.355954]  <TASK>
[   25.355972]  dump_stack_lvl+0x73/0xb0
[   25.356006]  print_report+0xd1/0x640
[   25.356031]  ? __virt_addr_valid+0x1db/0x2d0
[   25.356056]  ? kmalloc_uaf+0x320/0x380
[   25.356077]  ? kasan_complete_mode_report_info+0x64/0x200
[   25.356103]  ? kmalloc_uaf+0x320/0x380
[   25.356123]  kasan_report+0x141/0x180
[   25.356146]  ? kmalloc_uaf+0x320/0x380
[   25.356170]  __asan_report_load1_noabort+0x18/0x20
[   25.356195]  kmalloc_uaf+0x320/0x380
[   25.356234]  ? __pfx_kmalloc_uaf+0x10/0x10
[   25.356255]  ? __schedule+0x10da/0x2b60
[   25.356282]  ? __pfx_read_tsc+0x10/0x10
[   25.356305]  ? ktime_get_ts64+0x86/0x230
[   25.356331]  kunit_try_run_case+0x1a5/0x480
[   25.356357]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.356380]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   25.356405]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   25.356430]  ? __kthread_parkme+0x82/0x180
[   25.356451]  ? preempt_count_sub+0x50/0x80
[   25.356475]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.356499]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.356522]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   25.356546]  kthread+0x337/0x6f0
[   25.356566]  ? trace_preempt_on+0x20/0xc0
[   25.356590]  ? __pfx_kthread+0x10/0x10
[   25.356611]  ? _raw_spin_unlock_irq+0x47/0x80
[   25.356636]  ? calculate_sigpending+0x7b/0xa0
[   25.356660]  ? __pfx_kthread+0x10/0x10
[   25.356682]  ret_from_fork+0x116/0x1d0
[   25.356701]  ? __pfx_kthread+0x10/0x10
[   25.356722]  ret_from_fork_asm+0x1a/0x30
[   25.356754]  </TASK>
[   25.356766] 
[   25.367360] Allocated by task 232:
[   25.367505]  kasan_save_stack+0x45/0x70
[   25.367713]  kasan_save_track+0x18/0x40
[   25.367922]  kasan_save_alloc_info+0x3b/0x50
[   25.368098]  __kasan_kmalloc+0xb7/0xc0
[   25.369508]  __kmalloc_cache_noprof+0x189/0x420
[   25.369724]  kmalloc_uaf+0xaa/0x380
[   25.369888]  kunit_try_run_case+0x1a5/0x480
[   25.370095]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.371330]  kthread+0x337/0x6f0
[   25.371470]  ret_from_fork+0x116/0x1d0
[   25.371846]  ret_from_fork_asm+0x1a/0x30
[   25.372181] 
[   25.372299] Freed by task 232:
[   25.372436]  kasan_save_stack+0x45/0x70
[   25.373526]  kasan_save_track+0x18/0x40
[   25.373733]  kasan_save_free_info+0x3f/0x60
[   25.373932]  __kasan_slab_free+0x56/0x70
[   25.374112]  kfree+0x222/0x3f0
[   25.374259]  kmalloc_uaf+0x12c/0x380
[   25.374419]  kunit_try_run_case+0x1a5/0x480
[   25.374604]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.375357]  kthread+0x337/0x6f0
[   25.375916]  ret_from_fork+0x116/0x1d0
[   25.376665]  ret_from_fork_asm+0x1a/0x30
[   25.377328] 
[   25.377810] The buggy address belongs to the object at ffff888104919c40
[   25.377810]  which belongs to the cache kmalloc-16 of size 16
[   25.379810] The buggy address is located 8 bytes inside of
[   25.379810]  freed 16-byte region [ffff888104919c40, ffff888104919c50)
[   25.380917] 
[   25.381034] The buggy address belongs to the physical page:
[   25.382043] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x104919
[   25.383011] flags: 0x200000000000000(node=0|zone=2)
[   25.384049] page_type: f5(slab)
[   25.384679] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000
[   25.385849] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000
[   25.386720] page dumped because: kasan: bad access detected
[   25.387397] 
[   25.387497] Memory state around the buggy address:
[   25.388010]  ffff888104919b00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   25.389004]  ffff888104919b80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   25.390138] >ffff888104919c00: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc
[   25.390775]                                               ^
[   25.391261]  ffff888104919c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.392380]  ffff888104919d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.393522] ==================================================================