[   23.567679] ==================================================================
[   23.568999] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x4a8/0x520
[   23.569798] Read of size 1 at addr ffff8881053a95a8 by task kunit_try_catch/237
[   23.570522] 
[   23.570777] CPU: 0 UID: 0 PID: 237 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6-next-20250716 #1 PREEMPT(voluntary) 
[   23.570826] Tainted: [B]=BAD_PAGE, [N]=TEST
[   23.570838] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   23.570858] Call Trace:
[   23.570871]  <TASK>
[   23.570888]  dump_stack_lvl+0x73/0xb0
[   23.570918]  print_report+0xd1/0x610
[   23.570939]  ? __virt_addr_valid+0x1db/0x2d0
[   23.570961]  ? kmalloc_uaf2+0x4a8/0x520
[   23.571054]  ? kasan_complete_mode_report_info+0x64/0x200
[   23.571080]  ? kmalloc_uaf2+0x4a8/0x520
[   23.571100]  kasan_report+0x141/0x180
[   23.571121]  ? kmalloc_uaf2+0x4a8/0x520
[   23.571145]  __asan_report_load1_noabort+0x18/0x20
[   23.571168]  kmalloc_uaf2+0x4a8/0x520
[   23.571187]  ? __pfx_kmalloc_uaf2+0x10/0x10
[   23.571206]  ? finish_task_switch.isra.0+0x153/0x700
[   23.571227]  ? __switch_to+0x47/0xf80
[   23.571254]  ? __schedule+0x10c6/0x2b60
[   23.571288]  ? __pfx_read_tsc+0x10/0x10
[   23.571308]  ? ktime_get_ts64+0x86/0x230
[   23.571333]  kunit_try_run_case+0x1a5/0x480
[   23.571356]  ? __pfx_kunit_try_run_case+0x10/0x10
[   23.571378]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   23.571400]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   23.571421]  ? __kthread_parkme+0x82/0x180
[   23.571441]  ? preempt_count_sub+0x50/0x80
[   23.571462]  ? __pfx_kunit_try_run_case+0x10/0x10
[   23.571484]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   23.571510]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   23.571535]  kthread+0x337/0x6f0
[   23.571564]  ? trace_preempt_on+0x20/0xc0
[   23.571587]  ? __pfx_kthread+0x10/0x10
[   23.571607]  ? _raw_spin_unlock_irq+0x47/0x80
[   23.571627]  ? calculate_sigpending+0x7b/0xa0
[   23.571651]  ? __pfx_kthread+0x10/0x10
[   23.571671]  ret_from_fork+0x116/0x1d0
[   23.571689]  ? __pfx_kthread+0x10/0x10
[   23.571709]  ret_from_fork_asm+0x1a/0x30
[   23.571738]  </TASK>
[   23.571749] 
[   23.585229] Allocated by task 237:
[   23.585605]  kasan_save_stack+0x45/0x70
[   23.585961]  kasan_save_track+0x18/0x40
[   23.586112]  kasan_save_alloc_info+0x3b/0x50
[   23.586253]  __kasan_kmalloc+0xb7/0xc0
[   23.586390]  __kmalloc_cache_noprof+0x189/0x420
[   23.586538]  kmalloc_uaf2+0xc6/0x520
[   23.586892]  kunit_try_run_case+0x1a5/0x480
[   23.587343]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   23.587923]  kthread+0x337/0x6f0
[   23.588287]  ret_from_fork+0x116/0x1d0
[   23.588689]  ret_from_fork_asm+0x1a/0x30
[   23.589118] 
[   23.589306] Freed by task 237:
[   23.589652]  kasan_save_stack+0x45/0x70
[   23.590039]  kasan_save_track+0x18/0x40
[   23.590511]  kasan_save_free_info+0x3f/0x60
[   23.590903]  __kasan_slab_free+0x56/0x70
[   23.591252]  kfree+0x222/0x3f0
[   23.591377]  kmalloc_uaf2+0x14c/0x520
[   23.591572]  kunit_try_run_case+0x1a5/0x480
[   23.592014]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   23.592563]  kthread+0x337/0x6f0
[   23.592879]  ret_from_fork+0x116/0x1d0
[   23.593199]  ret_from_fork_asm+0x1a/0x30
[   23.593346] 
[   23.593436] The buggy address belongs to the object at ffff8881053a9580
[   23.593436]  which belongs to the cache kmalloc-64 of size 64
[   23.594454] The buggy address is located 40 bytes inside of
[   23.594454]  freed 64-byte region [ffff8881053a9580, ffff8881053a95c0)
[   23.595490] 
[   23.595565] The buggy address belongs to the physical page:
[   23.595727] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1053a9
[   23.596245] flags: 0x200000000000000(node=0|zone=2)
[   23.596790] page_type: f5(slab)
[   23.597093] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000
[   23.597475] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000
[   23.598184] page dumped because: kasan: bad access detected
[   23.598784] 
[   23.598941] Memory state around the buggy address:
[   23.599236]  ffff8881053a9480: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   23.599862]  ffff8881053a9500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   23.600540] >ffff8881053a9580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   23.600748]                                   ^
[   23.600902]  ffff8881053a9600: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc
[   23.601595]  ffff8881053a9680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   23.602300] ==================================================================