[   23.860005] ==================================================================
[   23.860599] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60
[   23.861180] Read of size 4 at addr ffff888106025e00 by task swapper/1/0
[   23.861425] 
[   23.861541] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G    B            N  6.16.0-rc6-next-20250716 #1 PREEMPT(voluntary) 
[   23.861614] Tainted: [B]=BAD_PAGE, [N]=TEST
[   23.861627] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   23.861648] Call Trace:
[   23.861675]  <IRQ>
[   23.861696]  dump_stack_lvl+0x73/0xb0
[   23.861731]  print_report+0xd1/0x610
[   23.861756]  ? __virt_addr_valid+0x1db/0x2d0
[   23.861779]  ? rcu_uaf_reclaim+0x50/0x60
[   23.861799]  ? kasan_complete_mode_report_info+0x64/0x200
[   23.861824]  ? rcu_uaf_reclaim+0x50/0x60
[   23.861843]  kasan_report+0x141/0x180
[   23.861864]  ? rcu_uaf_reclaim+0x50/0x60
[   23.862003]  __asan_report_load4_noabort+0x18/0x20
[   23.862028]  rcu_uaf_reclaim+0x50/0x60
[   23.862048]  rcu_core+0x66f/0x1c40
[   23.862078]  ? __pfx_rcu_core+0x10/0x10
[   23.862099]  ? ktime_get+0x6b/0x150
[   23.862126]  rcu_core_si+0x12/0x20
[   23.862145]  handle_softirqs+0x209/0x730
[   23.862166]  ? hrtimer_interrupt+0x2fe/0x780
[   23.862194]  ? __pfx_handle_softirqs+0x10/0x10
[   23.862218]  __irq_exit_rcu+0xc9/0x110
[   23.862237]  irq_exit_rcu+0x12/0x20
[   23.862256]  sysvec_apic_timer_interrupt+0x81/0x90
[   23.862295]  </IRQ>
[   23.862327]  <TASK>
[   23.862338]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   23.862433] RIP: 0010:pv_native_safe_halt+0xf/0x20
[   23.862656] Code: 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d e3 e2 16 00 fb f4 <e9> 7c 1d 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
[   23.862742] RSP: 0000:ffff88810087fdc8 EFLAGS: 00010212
[   23.862830] RAX: ffff8881a3913000 RBX: ffff88810085b000 RCX: ffffffffb531da25
[   23.862898] RDX: ffffed102b626193 RSI: 0000000000000004 RDI: 000000000001d74c
[   23.862943] RBP: ffff88810087fdd0 R08: 0000000000000001 R09: ffffed102b626192
[   23.862986] R10: ffff88815b130c93 R11: ffff88815b1363c8 R12: 0000000000000001
[   23.863029] R13: ffffed102010b600 R14: ffffffffb6ffabd0 R15: 0000000000000000
[   23.863086]  ? ct_kernel_exit.constprop.0+0xa5/0xd0
[   23.863137]  ? default_idle+0xd/0x20
[   23.863159]  arch_cpu_idle+0xd/0x20
[   23.863180]  default_idle_call+0x48/0x80
[   23.863202]  do_idle+0x379/0x4f0
[   23.863227]  ? __pfx_do_idle+0x10/0x10
[   23.863247]  ? _raw_spin_unlock_irqrestore+0x49/0x90
[   23.863270]  ? complete+0x15b/0x1d0
[   23.863311]  cpu_startup_entry+0x5c/0x70
[   23.863334]  start_secondary+0x211/0x290
[   23.863357]  ? __pfx_start_secondary+0x10/0x10
[   23.863382]  common_startup_64+0x13e/0x148
[   23.863414]  </TASK>
[   23.863425] 
[   23.873222] Allocated by task 247:
[   23.873400]  kasan_save_stack+0x45/0x70
[   23.873596]  kasan_save_track+0x18/0x40
[   23.873783]  kasan_save_alloc_info+0x3b/0x50
[   23.874946]  __kasan_kmalloc+0xb7/0xc0
[   23.875103]  __kmalloc_cache_noprof+0x189/0x420
[   23.875317]  rcu_uaf+0xb0/0x330
[   23.875436]  kunit_try_run_case+0x1a5/0x480
[   23.875659]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   23.875910]  kthread+0x337/0x6f0
[   23.876082]  ret_from_fork+0x116/0x1d0
[   23.876217]  ret_from_fork_asm+0x1a/0x30
[   23.877220] 
[   23.877318] Freed by task 0:
[   23.877424]  kasan_save_stack+0x45/0x70
[   23.877628]  kasan_save_track+0x18/0x40
[   23.877791]  kasan_save_free_info+0x3f/0x60
[   23.878038]  __kasan_slab_free+0x56/0x70
[   23.878173]  kfree+0x222/0x3f0
[   23.878321]  rcu_uaf_reclaim+0x1f/0x60
[   23.878633]  rcu_core+0x66f/0x1c40
[   23.878916]  rcu_core_si+0x12/0x20
[   23.879039]  handle_softirqs+0x209/0x730
[   23.879301]  __irq_exit_rcu+0xc9/0x110
[   23.879491]  irq_exit_rcu+0x12/0x20
[   23.879651]  sysvec_apic_timer_interrupt+0x81/0x90
[   23.880028]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   23.880193] 
[   23.880296] Last potentially related work creation:
[   23.880514]  kasan_save_stack+0x45/0x70
[   23.880735]  kasan_record_aux_stack+0xb2/0xc0
[   23.881079]  __call_rcu_common.constprop.0+0x7b/0x9e0
[   23.881405]  call_rcu+0x12/0x20
[   23.881602]  rcu_uaf+0x168/0x330
[   23.881733]  kunit_try_run_case+0x1a5/0x480
[   23.881988]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   23.882189]  kthread+0x337/0x6f0
[   23.882393]  ret_from_fork+0x116/0x1d0
[   23.882599]  ret_from_fork_asm+0x1a/0x30
[   23.882768] 
[   23.882845] The buggy address belongs to the object at ffff888106025e00
[   23.882845]  which belongs to the cache kmalloc-32 of size 32
[   23.883382] The buggy address is located 0 bytes inside of
[   23.883382]  freed 32-byte region [ffff888106025e00, ffff888106025e20)
[   23.884115] 
[   23.884190] The buggy address belongs to the physical page:
[   23.884431] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106025
[   23.884948] flags: 0x200000000000000(node=0|zone=2)
[   23.885195] page_type: f5(slab)
[   23.885378] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   23.885827] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   23.886128] page dumped because: kasan: bad access detected
[   23.886432] 
[   23.886523] Memory state around the buggy address:
[   23.886743]  ffff888106025d00: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
[   23.886948]  ffff888106025d80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   23.887238] >ffff888106025e00: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   23.887567]                    ^
[   23.887743]  ffff888106025e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   23.888031]  ffff888106025f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   23.888231] ==================================================================