[   12.171758] ==================================================================
[   12.172259] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60
[   12.172533] Read of size 4 at addr ffff8881027cfb80 by task swapper/1/0
[   12.173197] 
[   12.173336] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   12.173385] Tainted: [B]=BAD_PAGE, [N]=TEST
[   12.173396] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   12.173418] Call Trace:
[   12.173447]  <IRQ>
[   12.173466]  dump_stack_lvl+0x73/0xb0
[   12.173498]  print_report+0xd1/0x650
[   12.173522]  ? __virt_addr_valid+0x1db/0x2d0
[   12.173545]  ? rcu_uaf_reclaim+0x50/0x60
[   12.173565]  ? kasan_complete_mode_report_info+0x64/0x200
[   12.173586]  ? rcu_uaf_reclaim+0x50/0x60
[   12.173605]  kasan_report+0x141/0x180
[   12.173626]  ? rcu_uaf_reclaim+0x50/0x60
[   12.173907]  __asan_report_load4_noabort+0x18/0x20
[   12.173941]  rcu_uaf_reclaim+0x50/0x60
[   12.173961]  rcu_core+0x66f/0x1c40
[   12.173991]  ? __pfx_rcu_core+0x10/0x10
[   12.174011]  ? ktime_get+0x6b/0x150
[   12.174049]  ? handle_softirqs+0x18e/0x730
[   12.174073]  rcu_core_si+0x12/0x20
[   12.174091]  handle_softirqs+0x209/0x730
[   12.174109]  ? hrtimer_interrupt+0x2fe/0x780
[   12.174130]  ? __pfx_handle_softirqs+0x10/0x10
[   12.174154]  __irq_exit_rcu+0xc9/0x110
[   12.174172]  irq_exit_rcu+0x12/0x20
[   12.174191]  sysvec_apic_timer_interrupt+0x81/0x90
[   12.174214]  </IRQ>
[   12.174245]  <TASK>
[   12.174256]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   12.174347] RIP: 0010:pv_native_safe_halt+0xf/0x20
[   12.174560] 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 03 8a 21 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
[   12.174683] RSP: 0000:ffff888100877dc8 EFLAGS: 00010206
[   12.174786] RAX: ffff8881d3574000 RBX: ffff888100853000 RCX: ffffffff856730e5
[   12.174830] RDX: ffffed102b62618b RSI: 0000000000000004 RDI: 000000000000faa4
[   12.174879] RBP: ffff888100877dd0 R08: 0000000000000001 R09: ffffed102b62618a
[   12.174920] R10: ffff88815b130c53 R11: 0000000000023c00 R12: 0000000000000001
[   12.174978] R13: ffffed102010a600 R14: ffffffff873b0690 R15: 0000000000000000
[   12.175049]  ? ct_kernel_exit.constprop.0+0xa5/0xd0
[   12.175103]  ? default_idle+0xd/0x20
[   12.175124]  arch_cpu_idle+0xd/0x20
[   12.175144]  default_idle_call+0x48/0x80
[   12.175165]  do_idle+0x379/0x4f0
[   12.175188]  ? complete+0x15b/0x1d0
[   12.175205]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   12.175229]  ? __pfx_do_idle+0x10/0x10
[   12.175248]  ? _raw_spin_unlock_irqrestore+0x49/0x90
[   12.175270]  ? complete+0x15b/0x1d0
[   12.175290]  cpu_startup_entry+0x5c/0x70
[   12.175312]  start_secondary+0x211/0x290
[   12.175333]  ? __pfx_start_secondary+0x10/0x10
[   12.175357]  common_startup_64+0x13e/0x148
[   12.175387]  </TASK>
[   12.175398] 
[   12.188457] Allocated by task 215:
[   12.188794]  kasan_save_stack+0x45/0x70
[   12.189005]  kasan_save_track+0x18/0x40
[   12.189198]  kasan_save_alloc_info+0x3b/0x50
[   12.189397]  __kasan_kmalloc+0xb7/0xc0
[   12.189571]  __kmalloc_cache_noprof+0x189/0x420
[   12.189844]  rcu_uaf+0xb0/0x330
[   12.190004]  kunit_try_run_case+0x1a5/0x480
[   12.190211]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.190446]  kthread+0x337/0x6f0
[   12.190604]  ret_from_fork+0x116/0x1d0
[   12.190837]  ret_from_fork_asm+0x1a/0x30
[   12.191031] 
[   12.191120] Freed by task 0:
[   12.191256]  kasan_save_stack+0x45/0x70
[   12.191435]  kasan_save_track+0x18/0x40
[   12.191607]  kasan_save_free_info+0x3f/0x60
[   12.191836]  __kasan_slab_free+0x56/0x70
[   12.192019]  kfree+0x222/0x3f0
[   12.192187]  rcu_uaf_reclaim+0x1f/0x60
[   12.192360]  rcu_core+0x66f/0x1c40
[   12.192522]  rcu_core_si+0x12/0x20
[   12.192736]  handle_softirqs+0x209/0x730
[   12.192920]  __irq_exit_rcu+0xc9/0x110
[   12.193103]  irq_exit_rcu+0x12/0x20
[   12.193268]  sysvec_apic_timer_interrupt+0x81/0x90
[   12.193480]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   12.193881] 
[   12.193988] Last potentially related work creation:
[   12.194242]  kasan_save_stack+0x45/0x70
[   12.194441]  kasan_record_aux_stack+0xb2/0xc0
[   12.194632]  __call_rcu_common.constprop.0+0x7b/0x9e0
[   12.194903]  call_rcu+0x12/0x20
[   12.195018]  rcu_uaf+0x168/0x330
[   12.195146]  kunit_try_run_case+0x1a5/0x480
[   12.195289]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.195459]  kthread+0x337/0x6f0
[   12.195578]  ret_from_fork+0x116/0x1d0
[   12.195708]  ret_from_fork_asm+0x1a/0x30
[   12.195851] 
[   12.195929] The buggy address belongs to the object at ffff8881027cfb80
[   12.195929]  which belongs to the cache kmalloc-32 of size 32
[   12.196543] The buggy address is located 0 bytes inside of
[   12.196543]  freed 32-byte region [ffff8881027cfb80, ffff8881027cfba0)
[   12.197323] 
[   12.197433] The buggy address belongs to the physical page:
[   12.197687] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1027cf
[   12.198985] flags: 0x200000000000000(node=0|zone=2)
[   12.199175] page_type: f5(slab)
[   12.199301] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   12.199533] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   12.200284] page dumped because: kasan: bad access detected
[   12.200549] 
[   12.200655] Memory state around the buggy address:
[   12.200884]  ffff8881027cfa80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   12.201214]  ffff8881027cfb00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   12.201526] >ffff8881027cfb80: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   12.202656]                    ^
[   12.202907]  ffff8881027cfc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   12.203189]  ffff8881027cfc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   12.203408] ==================================================================