[   13.340943] ==================================================================
[   13.341474] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60
[   13.341789] Read of size 4 at addr ffff8881029b6f80 by task swapper/0/0
[   13.342689] 
[   13.342970] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   13.343018] Tainted: [B]=BAD_PAGE, [N]=TEST
[   13.343029] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   13.343050] Call Trace:
[   13.343082]  <IRQ>
[   13.343101]  dump_stack_lvl+0x73/0xb0
[   13.343138]  print_report+0xd1/0x650
[   13.343189]  ? __virt_addr_valid+0x1db/0x2d0
[   13.343215]  ? rcu_uaf_reclaim+0x50/0x60
[   13.343234]  ? kasan_complete_mode_report_info+0x64/0x200
[   13.343257]  ? rcu_uaf_reclaim+0x50/0x60
[   13.343278]  kasan_report+0x141/0x180
[   13.343299]  ? rcu_uaf_reclaim+0x50/0x60
[   13.343323]  __asan_report_load4_noabort+0x18/0x20
[   13.343348]  rcu_uaf_reclaim+0x50/0x60
[   13.343369]  rcu_core+0x66f/0x1c40
[   13.343398]  ? __pfx_rcu_core+0x10/0x10
[   13.343418]  ? ktime_get+0x6b/0x150
[   13.343443]  rcu_core_si+0x12/0x20
[   13.343462]  handle_softirqs+0x209/0x730
[   13.343483]  ? hrtimer_interrupt+0x2fe/0x780
[   13.343505]  ? __pfx_handle_softirqs+0x10/0x10
[   13.343530]  __irq_exit_rcu+0xc9/0x110
[   13.343550]  irq_exit_rcu+0x12/0x20
[   13.343569]  sysvec_apic_timer_interrupt+0x81/0x90
[   13.343607]  </IRQ>
[   13.343634]  <TASK>
[   13.343644]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   13.343735] RIP: 0010:pv_native_safe_halt+0xf/0x20
[   13.344084] 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
[   13.344171] RSP: 0000:ffffffffa3607dd8 EFLAGS: 00010202
[   13.344258] RAX: ffff8881b6672000 RBX: ffffffffa361cac0 RCX: ffffffffa2474105
[   13.344302] RDX: ffffed102b60618b RSI: 0000000000000004 RDI: 00000000000153e4
[   13.344344] RBP: ffffffffa3607de0 R08: 0000000000000001 R09: ffffed102b60618a
[   13.344393] R10: ffff88815b030c53 R11: 00000000000df400 R12: 0000000000000000
[   13.344473] R13: fffffbfff46c3958 R14: ffffffffa41b1390 R15: 0000000000000000
[   13.344531]  ? ct_kernel_exit.constprop.0+0xa5/0xd0
[   13.344585]  ? default_idle+0xd/0x20
[   13.344624]  arch_cpu_idle+0xd/0x20
[   13.344646]  default_idle_call+0x48/0x80
[   13.344664]  do_idle+0x379/0x4f0
[   13.344690]  ? __pfx_do_idle+0x10/0x10
[   13.344717]  cpu_startup_entry+0x5c/0x70
[   13.344736]  rest_init+0x11a/0x140
[   13.344753]  ? acpi_subsystem_init+0x5d/0x150
[   13.344818]  start_kernel+0x330/0x410
[   13.344844]  x86_64_start_reservations+0x1c/0x30
[   13.344868]  x86_64_start_kernel+0x10d/0x120
[   13.344892]  common_startup_64+0x13e/0x148
[   13.344925]  </TASK>
[   13.344936] 
[   13.360639] Allocated by task 215:
[   13.360957]  kasan_save_stack+0x45/0x70
[   13.361168]  kasan_save_track+0x18/0x40
[   13.361354]  kasan_save_alloc_info+0x3b/0x50
[   13.361555]  __kasan_kmalloc+0xb7/0xc0
[   13.361752]  __kmalloc_cache_noprof+0x189/0x420
[   13.361973]  rcu_uaf+0xb0/0x330
[   13.362091]  kunit_try_run_case+0x1a5/0x480
[   13.362346]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.362624]  kthread+0x337/0x6f0
[   13.362750]  ret_from_fork+0x116/0x1d0
[   13.363355]  ret_from_fork_asm+0x1a/0x30
[   13.363523] 
[   13.363606] Freed by task 0:
[   13.363714]  kasan_save_stack+0x45/0x70
[   13.364122]  kasan_save_track+0x18/0x40
[   13.364325]  kasan_save_free_info+0x3f/0x60
[   13.364559]  __kasan_slab_free+0x56/0x70
[   13.364771]  kfree+0x222/0x3f0
[   13.365010]  rcu_uaf_reclaim+0x1f/0x60
[   13.365142]  rcu_core+0x66f/0x1c40
[   13.365299]  rcu_core_si+0x12/0x20
[   13.365543]  handle_softirqs+0x209/0x730
[   13.365754]  __irq_exit_rcu+0xc9/0x110
[   13.366167]  irq_exit_rcu+0x12/0x20
[   13.366320]  sysvec_apic_timer_interrupt+0x81/0x90
[   13.366510]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   13.366764] 
[   13.366915] Last potentially related work creation:
[   13.367203]  kasan_save_stack+0x45/0x70
[   13.367348]  kasan_record_aux_stack+0xb2/0xc0
[   13.367518]  __call_rcu_common.constprop.0+0x7b/0x9e0
[   13.367815]  call_rcu+0x12/0x20
[   13.368218]  rcu_uaf+0x168/0x330
[   13.368551]  kunit_try_run_case+0x1a5/0x480
[   13.368773]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.369029]  kthread+0x337/0x6f0
[   13.369198]  ret_from_fork+0x116/0x1d0
[   13.369383]  ret_from_fork_asm+0x1a/0x30
[   13.369622] 
[   13.369706] The buggy address belongs to the object at ffff8881029b6f80
[   13.369706]  which belongs to the cache kmalloc-32 of size 32
[   13.370326] The buggy address is located 0 bytes inside of
[   13.370326]  freed 32-byte region [ffff8881029b6f80, ffff8881029b6fa0)
[   13.370832] 
[   13.370983] The buggy address belongs to the physical page:
[   13.371338] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1029b6
[   13.371628] flags: 0x200000000000000(node=0|zone=2)
[   13.371879] page_type: f5(slab)
[   13.372161] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   13.372394] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   13.372995] page dumped because: kasan: bad access detected
[   13.373217] 
[   13.373297] Memory state around the buggy address:
[   13.373547]  ffff8881029b6e80: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
[   13.373794]  ffff8881029b6f00: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc
[   13.374060] >ffff8881029b6f80: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   13.374399]                    ^
[   13.374779]  ffff8881029b7000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   13.375114]  ffff8881029b7080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   13.375434] ==================================================================