[   18.885474] ==================================================================
[   18.886426] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60
[   18.887031] Read of size 4 at addr ffff888102a1a0c0 by task swapper/1/0
[   18.887546] 
[   18.887751] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G    B            N  6.16.0-rc2-next-20250617 #1 PREEMPT(voluntary) 
[   18.888046] Tainted: [B]=BAD_PAGE, [N]=TEST
[   18.888086] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   18.888146] Call Trace:
[   18.888208]  <IRQ>
[   18.888402]  dump_stack_lvl+0x73/0xb0
[   18.888495]  print_report+0xd1/0x650
[   18.888568]  ? __virt_addr_valid+0x1db/0x2d0
[   18.888644]  ? rcu_uaf_reclaim+0x50/0x60
[   18.888713]  ? kasan_complete_mode_report_info+0x64/0x200
[   18.888782]  ? rcu_uaf_reclaim+0x50/0x60
[   18.888867]  kasan_report+0x141/0x180
[   18.888946]  ? rcu_uaf_reclaim+0x50/0x60
[   18.889026]  __asan_report_load4_noabort+0x18/0x20
[   18.889102]  rcu_uaf_reclaim+0x50/0x60
[   18.889168]  rcu_core+0x66f/0x1c40
[   18.889317]  ? __pfx_rcu_core+0x10/0x10
[   18.889360]  ? ktime_get+0x6b/0x150
[   18.889401]  rcu_core_si+0x12/0x20
[   18.889431]  handle_softirqs+0x209/0x730
[   18.889462]  ? hrtimer_interrupt+0x2fe/0x780
[   18.889494]  ? __pfx_handle_softirqs+0x10/0x10
[   18.889528]  __irq_exit_rcu+0xc9/0x110
[   18.889556]  irq_exit_rcu+0x12/0x20
[   18.889582]  sysvec_apic_timer_interrupt+0x81/0x90
[   18.889614]  </IRQ>
[   18.889651]  <TASK>
[   18.889668]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   18.889783] RIP: 0010:pv_native_safe_halt+0xf/0x20
[   18.890061] 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 c3 48 1f 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
[   18.890170] RSP: 0000:ffff888100877dc8 EFLAGS: 00010212
[   18.890393] RAX: ffff88819b969000 RBX: ffff888100853000 RCX: ffffffffbd297225
[   18.890459] RDX: ffffed102b62618b RSI: 0000000000000004 RDI: 00000000000103fc
[   18.890519] RBP: ffff888100877dd0 R08: 0000000000000001 R09: ffffed102b62618a
[   18.890576] R10: ffff88815b130c53 R11: 0000000000072c00 R12: 0000000000000001
[   18.890631] R13: ffffed102010a600 R14: ffffffffbefb7990 R15: 0000000000000000
[   18.890707]  ? ct_kernel_exit.constprop.0+0xa5/0xd0
[   18.890783]  ? default_idle+0xd/0x20
[   18.890818]  arch_cpu_idle+0xd/0x20
[   18.890868]  default_idle_call+0x48/0x80
[   18.890900]  do_idle+0x379/0x4f0
[   18.890936]  ? __pfx_do_idle+0x10/0x10
[   18.890966]  ? _raw_spin_unlock_irqrestore+0x49/0x90
[   18.891004]  ? complete+0x15b/0x1d0
[   18.891033]  cpu_startup_entry+0x5c/0x70
[   18.891066]  start_secondary+0x211/0x290
[   18.891095]  ? __pfx_start_secondary+0x10/0x10
[   18.891129]  common_startup_64+0x13e/0x148
[   18.891170]  </TASK>
[   18.891185] 
[   18.910180] Allocated by task 225:
[   18.910667]  kasan_save_stack+0x45/0x70
[   18.911085]  kasan_save_track+0x18/0x40
[   18.911610]  kasan_save_alloc_info+0x3b/0x50
[   18.912039]  __kasan_kmalloc+0xb7/0xc0
[   18.912532]  __kmalloc_cache_noprof+0x189/0x420
[   18.912947]  rcu_uaf+0xb0/0x330
[   18.913201]  kunit_try_run_case+0x1a5/0x480
[   18.913599]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   18.914106]  kthread+0x337/0x6f0
[   18.914444]  ret_from_fork+0x116/0x1d0
[   18.915149]  ret_from_fork_asm+0x1a/0x30
[   18.915605] 
[   18.915765] Freed by task 0:
[   18.916075]  kasan_save_stack+0x45/0x70
[   18.916612]  kasan_save_track+0x18/0x40
[   18.917007]  kasan_save_free_info+0x3f/0x60
[   18.918579]  __kasan_slab_free+0x56/0x70
[   18.918952]  kfree+0x222/0x3f0
[   18.919264]  rcu_uaf_reclaim+0x1f/0x60
[   18.920749]  rcu_core+0x66f/0x1c40
[   18.921083]  rcu_core_si+0x12/0x20
[   18.921418]  handle_softirqs+0x209/0x730
[   18.921770]  __irq_exit_rcu+0xc9/0x110
[   18.922853]  irq_exit_rcu+0x12/0x20
[   18.923210]  sysvec_apic_timer_interrupt+0x81/0x90
[   18.924435]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   18.924923] 
[   18.925118] Last potentially related work creation:
[   18.925529]  kasan_save_stack+0x45/0x70
[   18.925921]  kasan_record_aux_stack+0xb2/0xc0
[   18.926346]  __call_rcu_common.constprop.0+0x7b/0x9e0
[   18.926755]  call_rcu+0x12/0x20
[   18.928003]  rcu_uaf+0x168/0x330
[   18.928311]  kunit_try_run_case+0x1a5/0x480
[   18.928704]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   18.929794]  kthread+0x337/0x6f0
[   18.930328]  ret_from_fork+0x116/0x1d0
[   18.930687]  ret_from_fork_asm+0x1a/0x30
[   18.931237] 
[   18.931863] The buggy address belongs to the object at ffff888102a1a0c0
[   18.931863]  which belongs to the cache kmalloc-32 of size 32
[   18.933113] The buggy address is located 0 bytes inside of
[   18.933113]  freed 32-byte region [ffff888102a1a0c0, ffff888102a1a0e0)
[   18.934940] 
[   18.935247] The buggy address belongs to the physical page:
[   18.935594] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102a1a
[   18.936566] flags: 0x200000000000000(node=0|zone=2)
[   18.936872] page_type: f5(slab)
[   18.937514] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   18.938200] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   18.938913] page dumped because: kasan: bad access detected
[   18.939763] 
[   18.939959] Memory state around the buggy address:
[   18.940554]  ffff888102a19f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.941778]  ffff888102a1a000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   18.942326] >ffff888102a1a080: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   18.943140]                                            ^
[   18.943792]  ffff888102a1a100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.944368]  ffff888102a1a180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.944885] ==================================================================