[   11.288821] ==================================================================
[   11.289313] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x4a8/0x520
[   11.289925] Read of size 1 at addr ffff8881028229a8 by task kunit_try_catch/206
[   11.290344] 
[   11.290474] CPU: 0 UID: 0 PID: 206 Comm: kunit_try_catch Tainted: G    B            N  6.15.0-rc7-next-20250526 #1 PREEMPT(voluntary) 
[   11.290520] Tainted: [B]=BAD_PAGE, [N]=TEST
[   11.290532] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   11.290553] Call Trace:
[   11.290565]  <TASK>
[   11.290580]  dump_stack_lvl+0x73/0xb0
[   11.290605]  print_report+0xd1/0x650
[   11.290627]  ? __virt_addr_valid+0x1db/0x2d0
[   11.290649]  ? kmalloc_uaf2+0x4a8/0x520
[   11.290669]  ? kasan_complete_mode_report_info+0x64/0x200
[   11.290692]  ? kmalloc_uaf2+0x4a8/0x520
[   11.290712]  kasan_report+0x141/0x180
[   11.290734]  ? kmalloc_uaf2+0x4a8/0x520
[   11.290759]  __asan_report_load1_noabort+0x18/0x20
[   11.290779]  kmalloc_uaf2+0x4a8/0x520
[   11.290800]  ? __pfx_kmalloc_uaf2+0x10/0x10
[   11.290819]  ? finish_task_switch.isra.0+0x153/0x700
[   11.290841]  ? __switch_to+0x47/0xf50
[   11.290866]  ? __schedule+0x10cc/0x2b60
[   11.290890]  ? __pfx_read_tsc+0x10/0x10
[   11.290909]  ? ktime_get_ts64+0x86/0x230
[   11.290933]  kunit_try_run_case+0x1a5/0x480
[   11.290953]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.290972]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   11.290996]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   11.291020]  ? __kthread_parkme+0x82/0x180
[   11.291040]  ? preempt_count_sub+0x50/0x80
[   11.291062]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.291082]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.291105]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   11.291129]  kthread+0x337/0x6f0
[   11.291148]  ? trace_preempt_on+0x20/0xc0
[   11.291182]  ? __pfx_kthread+0x10/0x10
[   11.291202]  ? _raw_spin_unlock_irq+0x47/0x80
[   11.291224]  ? calculate_sigpending+0x7b/0xa0
[   11.291247]  ? __pfx_kthread+0x10/0x10
[   11.291267]  ret_from_fork+0x116/0x1d0
[   11.291285]  ? __pfx_kthread+0x10/0x10
[   11.291305]  ret_from_fork_asm+0x1a/0x30
[   11.291334]  </TASK>
[   11.291344] 
[   11.299140] Allocated by task 206:
[   11.299273]  kasan_save_stack+0x45/0x70
[   11.299429]  kasan_save_track+0x18/0x40
[   11.299624]  kasan_save_alloc_info+0x3b/0x50
[   11.299831]  __kasan_kmalloc+0xb7/0xc0
[   11.300171]  __kmalloc_cache_noprof+0x189/0x420
[   11.300343]  kmalloc_uaf2+0xc6/0x520
[   11.300487]  kunit_try_run_case+0x1a5/0x480
[   11.300634]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.301203]  kthread+0x337/0x6f0
[   11.301410]  ret_from_fork+0x116/0x1d0
[   11.301606]  ret_from_fork_asm+0x1a/0x30
[   11.301932] 
[   11.302101] Freed by task 206:
[   11.302268]  kasan_save_stack+0x45/0x70
[   11.302484]  kasan_save_track+0x18/0x40
[   11.302628]  kasan_save_free_info+0x3f/0x60
[   11.302774]  __kasan_slab_free+0x56/0x70
[   11.303046]  kfree+0x222/0x3f0
[   11.303198]  kmalloc_uaf2+0x14c/0x520
[   11.303348]  kunit_try_run_case+0x1a5/0x480
[   11.303563]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.303763]  kthread+0x337/0x6f0
[   11.303885]  ret_from_fork+0x116/0x1d0
[   11.304018]  ret_from_fork_asm+0x1a/0x30
[   11.304157] 
[   11.304249] The buggy address belongs to the object at ffff888102822980
[   11.304249]  which belongs to the cache kmalloc-64 of size 64
[   11.304916] The buggy address is located 40 bytes inside of
[   11.304916]  freed 64-byte region [ffff888102822980, ffff8881028229c0)
[   11.305807] 
[   11.305910] The buggy address belongs to the physical page:
[   11.306217] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102822
[   11.306484] flags: 0x200000000000000(node=0|zone=2)
[   11.306651] page_type: f5(slab)
[   11.306822] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000
[   11.307173] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000
[   11.307526] page dumped because: kasan: bad access detected
[   11.307755] 
[   11.307871] Memory state around the buggy address:
[   11.308084]  ffff888102822880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   11.308426]  ffff888102822900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   11.308748] >ffff888102822980: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   11.309157]                                   ^
[   11.309406]  ffff888102822a00: 00 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc
[   11.309678]  ffff888102822a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   11.310002] ==================================================================