[   13.042919] ==================================================================
[   13.043406] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60
[   13.043730] Read of size 4 at addr ffff88810279cf40 by task swapper/1/0
[   13.044057] 
[   13.044159] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   13.044309] Tainted: [B]=BAD_PAGE, [N]=TEST
[   13.044327] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   13.044347] Call Trace:
[   13.044377]  <IRQ>
[   13.044392]  dump_stack_lvl+0x73/0xb0
[   13.044424]  print_report+0xd1/0x650
[   13.044446]  ? __virt_addr_valid+0x1db/0x2d0
[   13.044469]  ? rcu_uaf_reclaim+0x50/0x60
[   13.044489]  ? kasan_complete_mode_report_info+0x64/0x200
[   13.044536]  ? rcu_uaf_reclaim+0x50/0x60
[   13.044558]  kasan_report+0x141/0x180
[   13.044579]  ? rcu_uaf_reclaim+0x50/0x60
[   13.044603]  __asan_report_load4_noabort+0x18/0x20
[   13.044627]  rcu_uaf_reclaim+0x50/0x60
[   13.044647]  rcu_core+0x66f/0x1c40
[   13.044674]  ? __pfx_rcu_core+0x10/0x10
[   13.044695]  ? ktime_get+0x6b/0x150
[   13.044735]  ? handle_softirqs+0x18e/0x730
[   13.044760]  rcu_core_si+0x12/0x20
[   13.044780]  handle_softirqs+0x209/0x730
[   13.044799]  ? hrtimer_interrupt+0x2fe/0x780
[   13.044879]  ? __pfx_handle_softirqs+0x10/0x10
[   13.044926]  __irq_exit_rcu+0xc9/0x110
[   13.044948]  irq_exit_rcu+0x12/0x20
[   13.044968]  sysvec_apic_timer_interrupt+0x81/0x90
[   13.044994]  </IRQ>
[   13.045023]  <TASK>
[   13.045046]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   13.045136] RIP: 0010:pv_native_safe_halt+0xf/0x20
[   13.045356] 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 81 21 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
[   13.045436] RSP: 0000:ffff888100877dc8 EFLAGS: 00010216
[   13.045519] RAX: ffff8881a6f72000 RBX: ffff888100853000 RCX: ffffffffb1c74105
[   13.045563] RDX: ffffed102b62618b RSI: 0000000000000004 RDI: 000000000001271c
[   13.045606] RBP: ffff888100877dd0 R08: 0000000000000001 R09: ffffed102b62618a
[   13.045646] R10: ffff88815b130c53 R11: 00000000000e2800 R12: 0000000000000001
[   13.045687] R13: ffffed102010a600 R14: ffffffffb39b1490 R15: 0000000000000000
[   13.045741]  ? ct_kernel_exit.constprop.0+0xa5/0xd0
[   13.045905]  ? default_idle+0xd/0x20
[   13.045930]  arch_cpu_idle+0xd/0x20
[   13.045951]  default_idle_call+0x48/0x80
[   13.045970]  do_idle+0x379/0x4f0
[   13.045992]  ? complete+0x15b/0x1d0
[   13.046009]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   13.046045]  ? __pfx_do_idle+0x10/0x10
[   13.046066]  ? _raw_spin_unlock_irqrestore+0x49/0x90
[   13.046089]  ? complete+0x15b/0x1d0
[   13.046110]  cpu_startup_entry+0x5c/0x70
[   13.046129]  start_secondary+0x211/0x290
[   13.046151]  ? __pfx_start_secondary+0x10/0x10
[   13.046176]  common_startup_64+0x13e/0x148
[   13.046208]  </TASK>
[   13.046218] 
[   13.062216] Allocated by task 215:
[   13.062393]  kasan_save_stack+0x45/0x70
[   13.062672]  kasan_save_track+0x18/0x40
[   13.062994]  kasan_save_alloc_info+0x3b/0x50
[   13.063230]  __kasan_kmalloc+0xb7/0xc0
[   13.063666]  __kmalloc_cache_noprof+0x189/0x420
[   13.064344]  rcu_uaf+0xb0/0x330
[   13.064756]  kunit_try_run_case+0x1a5/0x480
[   13.065322]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.065511]  kthread+0x337/0x6f0
[   13.065634]  ret_from_fork+0x116/0x1d0
[   13.065766]  ret_from_fork_asm+0x1a/0x30
[   13.066229] 
[   13.066563] Freed by task 0:
[   13.066702]  kasan_save_stack+0x45/0x70
[   13.066855]  kasan_save_track+0x18/0x40
[   13.067185]  kasan_save_free_info+0x3f/0x60
[   13.067457]  __kasan_slab_free+0x56/0x70
[   13.067663]  kfree+0x222/0x3f0
[   13.067827]  rcu_uaf_reclaim+0x1f/0x60
[   13.068108]  rcu_core+0x66f/0x1c40
[   13.068240]  rcu_core_si+0x12/0x20
[   13.068416]  handle_softirqs+0x209/0x730
[   13.068609]  __irq_exit_rcu+0xc9/0x110
[   13.068806]  irq_exit_rcu+0x12/0x20
[   13.069249]  sysvec_apic_timer_interrupt+0x81/0x90
[   13.069463]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   13.069686] 
[   13.069801] Last potentially related work creation:
[   13.070653]  kasan_save_stack+0x45/0x70
[   13.070875]  kasan_record_aux_stack+0xb2/0xc0
[   13.071203]  __call_rcu_common.constprop.0+0x7b/0x9e0
[   13.071660]  call_rcu+0x12/0x20
[   13.071953]  rcu_uaf+0x168/0x330
[   13.072103]  kunit_try_run_case+0x1a5/0x480
[   13.072334]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.072795]  kthread+0x337/0x6f0
[   13.073186]  ret_from_fork+0x116/0x1d0
[   13.073401]  ret_from_fork_asm+0x1a/0x30
[   13.073567] 
[   13.073668] The buggy address belongs to the object at ffff88810279cf40
[   13.073668]  which belongs to the cache kmalloc-32 of size 32
[   13.074567] The buggy address is located 0 bytes inside of
[   13.074567]  freed 32-byte region [ffff88810279cf40, ffff88810279cf60)
[   13.075488] 
[   13.075760] The buggy address belongs to the physical page:
[   13.076301] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10279c
[   13.076655] flags: 0x200000000000000(node=0|zone=2)
[   13.076910] page_type: f5(slab)
[   13.077370] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   13.077780] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   13.078377] page dumped because: kasan: bad access detected
[   13.078839] 
[   13.078985] Memory state around the buggy address:
[   13.079395]  ffff88810279ce00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   13.079806]  ffff88810279ce80: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   13.080505] >ffff88810279cf00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   13.080860]                                            ^
[   13.081178]  ffff88810279cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   13.081493]  ffff88810279d000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   13.081998] ==================================================================