[   18.157867] ==================================================================
[   18.158818] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60
[   18.159327] Read of size 4 at addr ffff88810a07c480 by task swapper/1/0
[   18.160047] 
[   18.160303] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G    B            N  6.15.4-rc1 #1 PREEMPT(voluntary) 
[   18.160425] Tainted: [B]=BAD_PAGE, [N]=TEST
[   18.160461] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   18.160520] Call Trace:
[   18.160580]  <IRQ>
[   18.160933]  dump_stack_lvl+0x73/0xb0
[   18.161019]  print_report+0xd1/0x650
[   18.161088]  ? __virt_addr_valid+0x1db/0x2d0
[   18.161128]  ? rcu_uaf_reclaim+0x50/0x60
[   18.161160]  ? kasan_complete_mode_report_info+0x64/0x200
[   18.161194]  ? rcu_uaf_reclaim+0x50/0x60
[   18.161241]  kasan_report+0x141/0x180
[   18.161646]  ? rcu_uaf_reclaim+0x50/0x60
[   18.161880]  __asan_report_load4_noabort+0x18/0x20
[   18.161927]  rcu_uaf_reclaim+0x50/0x60
[   18.161959]  rcu_core+0x66c/0x1c30
[   18.162003]  ? __pfx_rcu_core+0x10/0x10
[   18.162038]  ? ktime_get+0x6b/0x150
[   18.162078]  rcu_core_si+0x12/0x20
[   18.162103]  handle_softirqs+0x209/0x730
[   18.162137]  ? hrtimer_interrupt+0x2fe/0x780
[   18.162170]  ? __pfx_handle_softirqs+0x10/0x10
[   18.162209]  __irq_exit_rcu+0xc9/0x110
[   18.162270]  irq_exit_rcu+0x12/0x20
[   18.162298]  sysvec_apic_timer_interrupt+0x81/0x90
[   18.162337]  </IRQ>
[   18.162377]  <TASK>
[   18.162394]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   18.162508] RIP: 0010:pv_native_safe_halt+0xf/0x20
[   18.162834] 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 83 cd 27 00 fb f4 <e9> fc 1f 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
[   18.162947] RSP: 0000:ffff88810086fdc8 EFLAGS: 00010206
[   18.163070] RAX: ffff8881b2593000 RBX: ffff8881008353c0 RCX: ffffffffa660d015
[   18.163133] RDX: ffffed102b626103 RSI: 0000000000000004 RDI: 000000000001eb94
[   18.163194] RBP: ffff88810086fdd0 R08: 0000000000000001 R09: ffffed102b626102
[   18.163277] R10: ffff88815b130813 R11: 0000000000034000 R12: 0000000000000001
[   18.163340] R13: ffffed1020106a78 R14: ffffffffa839c210 R15: 0000000000000000
[   18.163419]  ? ct_kernel_exit.constprop.0+0xa5/0xd0
[   18.163492]  ? default_idle+0xd/0x20
[   18.163524]  arch_cpu_idle+0xd/0x20
[   18.163551]  default_idle_call+0x48/0x80
[   18.163581]  do_idle+0x379/0x4f0
[   18.163671]  ? __pfx_do_idle+0x10/0x10
[   18.163739]  ? _raw_spin_unlock_irqrestore+0x49/0x90
[   18.163781]  ? complete+0x15b/0x1d0
[   18.163816]  cpu_startup_entry+0x5c/0x70
[   18.163847]  start_secondary+0x211/0x290
[   18.163877]  ? __pfx_start_secondary+0x10/0x10
[   18.163912]  common_startup_64+0x13e/0x148
[   18.163953]  </TASK>
[   18.163968] 
[   18.188971] Allocated by task 219:
[   18.189297]  kasan_save_stack+0x45/0x70
[   18.189987]  kasan_save_track+0x18/0x40
[   18.190537]  kasan_save_alloc_info+0x3b/0x50
[   18.191085]  __kasan_kmalloc+0xb7/0xc0
[   18.191736]  __kmalloc_cache_noprof+0x189/0x420
[   18.192275]  rcu_uaf+0xb0/0x330
[   18.193159]  kunit_try_run_case+0x1a5/0x480
[   18.193826]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   18.194470]  kthread+0x337/0x6f0
[   18.195042]  ret_from_fork+0x41/0x80
[   18.195447]  ret_from_fork_asm+0x1a/0x30
[   18.196108] 
[   18.196330] Freed by task 0:
[   18.197382]  kasan_save_stack+0x45/0x70
[   18.197908]  kasan_save_track+0x18/0x40
[   18.198323]  kasan_save_free_info+0x3f/0x60
[   18.198726]  __kasan_slab_free+0x56/0x70
[   18.199106]  kfree+0x222/0x3f0
[   18.199468]  rcu_uaf_reclaim+0x1f/0x60
[   18.200249]  rcu_core+0x66c/0x1c30
[   18.200618]  rcu_core_si+0x12/0x20
[   18.201447]  handle_softirqs+0x209/0x730
[   18.202272]  __irq_exit_rcu+0xc9/0x110
[   18.202537]  irq_exit_rcu+0x12/0x20
[   18.203011]  sysvec_apic_timer_interrupt+0x81/0x90
[   18.203738]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   18.204708] 
[   18.205542] Last potentially related work creation:
[   18.206119]  kasan_save_stack+0x45/0x70
[   18.206527]  kasan_record_aux_stack+0xb2/0xc0
[   18.206883]  __call_rcu_common.constprop.0+0x72/0x9c0
[   18.207374]  call_rcu+0x12/0x20
[   18.207766]  rcu_uaf+0x168/0x330
[   18.208107]  kunit_try_run_case+0x1a5/0x480
[   18.208541]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   18.209459]  kthread+0x337/0x6f0
[   18.209934]  ret_from_fork+0x41/0x80
[   18.210366]  ret_from_fork_asm+0x1a/0x30
[   18.210911] 
[   18.211152] The buggy address belongs to the object at ffff88810a07c480
[   18.211152]  which belongs to the cache kmalloc-32 of size 32
[   18.212289] The buggy address is located 0 bytes inside of
[   18.212289]  freed 32-byte region [ffff88810a07c480, ffff88810a07c4a0)
[   18.213545] 
[   18.213927] The buggy address belongs to the physical page:
[   18.214427] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10a07c
[   18.215136] flags: 0x200000000000000(node=0|zone=2)
[   18.215676] page_type: f5(slab)
[   18.216034] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   18.216601] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   18.217744] page dumped because: kasan: bad access detected
[   18.218169] 
[   18.218445] Memory state around the buggy address:
[   18.218996]  ffff88810a07c380: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
[   18.219754]  ffff88810a07c400: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc
[   18.220420] >ffff88810a07c480: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   18.221319]                    ^
[   18.221829]  ffff88810a07c500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.222443]  ffff88810a07c580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.223107] ==================================================================