[   12.007168] ==================================================================
[   12.007619] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60
[   12.007919] Read of size 4 at addr ffff888103109c00 by task swapper/0/0
[   12.008173] 
[   12.008304] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   12.008361] Tainted: [B]=BAD_PAGE, [N]=TEST
[   12.008373] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   12.008393] Call Trace:
[   12.008418]  <IRQ>
[   12.008436]  dump_stack_lvl+0x73/0xb0
[   12.008466]  print_report+0xd1/0x650
[   12.008488]  ? __virt_addr_valid+0x1db/0x2d0
[   12.008510]  ? rcu_uaf_reclaim+0x50/0x60
[   12.008540]  ? kasan_complete_mode_report_info+0x64/0x200
[   12.008561]  ? rcu_uaf_reclaim+0x50/0x60
[   12.008580]  kasan_report+0x141/0x180
[   12.008601]  ? rcu_uaf_reclaim+0x50/0x60
[   12.008636]  __asan_report_load4_noabort+0x18/0x20
[   12.008659]  rcu_uaf_reclaim+0x50/0x60
[   12.008678]  rcu_core+0x66f/0x1c40
[   12.008706]  ? __pfx_rcu_core+0x10/0x10
[   12.008726]  ? ktime_get+0x6b/0x150
[   12.008747]  ? handle_softirqs+0x18e/0x730
[   12.008771]  rcu_core_si+0x12/0x20
[   12.008789]  handle_softirqs+0x209/0x730
[   12.008807]  ? hrtimer_interrupt+0x2fe/0x780
[   12.008828]  ? __pfx_handle_softirqs+0x10/0x10
[   12.008851]  __irq_exit_rcu+0xc9/0x110
[   12.008880]  irq_exit_rcu+0x12/0x20
[   12.008898]  sysvec_apic_timer_interrupt+0x81/0x90
[   12.008921]  </IRQ>
[   12.008955]  <TASK>
[   12.008966]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   12.009137] RIP: 0010:pv_native_safe_halt+0xf/0x20
[   12.009360] 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
[   12.009440] RSP: 0000:ffffffff8dc07dd8 EFLAGS: 00010216
[   12.009525] RAX: ffff8881cc074000 RBX: ffffffff8dc1cac0 RCX: ffffffff8ca730e5
[   12.009570] RDX: ffffed102b60618b RSI: 0000000000000004 RDI: 0000000000005c1c
[   12.009612] RBP: ffffffff8dc07de0 R08: 0000000000000001 R09: ffffed102b60618a
[   12.009652] R10: ffff88815b030c53 R11: 000000000000b400 R12: 0000000000000000
[   12.009694] R13: fffffbfff1b83958 R14: ffffffff8e7b0690 R15: 0000000000000000
[   12.009755]  ? ct_kernel_exit.constprop.0+0xa5/0xd0
[   12.009807]  ? default_idle+0xd/0x20
[   12.009828]  arch_cpu_idle+0xd/0x20
[   12.009848]  default_idle_call+0x48/0x80
[   12.009869]  do_idle+0x379/0x4f0
[   12.009894]  ? __pfx_do_idle+0x10/0x10
[   12.009915]  ? trace_preempt_on+0x20/0xc0
[   12.009936]  ? schedule+0x86/0x2e0
[   12.009954]  ? preempt_count_sub+0x50/0x80
[   12.009976]  cpu_startup_entry+0x5c/0x70
[   12.009998]  rest_init+0x11a/0x140
[   12.010013]  ? acpi_subsystem_init+0x5d/0x150
[   12.010051]  start_kernel+0x330/0x410
[   12.010074]  x86_64_start_reservations+0x1c/0x30
[   12.010096]  x86_64_start_kernel+0x10d/0x120
[   12.010118]  common_startup_64+0x13e/0x148
[   12.010149]  </TASK>
[   12.010160] 
[   12.025870] Allocated by task 215:
[   12.026191]  kasan_save_stack+0x45/0x70
[   12.026379]  kasan_save_track+0x18/0x40
[   12.026559]  kasan_save_alloc_info+0x3b/0x50
[   12.026747]  __kasan_kmalloc+0xb7/0xc0
[   12.026908]  __kmalloc_cache_noprof+0x189/0x420
[   12.027361]  rcu_uaf+0xb0/0x330
[   12.027529]  kunit_try_run_case+0x1a5/0x480
[   12.027728]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.027952]  kthread+0x337/0x6f0
[   12.028792]  ret_from_fork+0x116/0x1d0
[   12.028986]  ret_from_fork_asm+0x1a/0x30
[   12.029134] 
[   12.029484] Freed by task 0:
[   12.029772]  kasan_save_stack+0x45/0x70
[   12.030151]  kasan_save_track+0x18/0x40
[   12.030675]  kasan_save_free_info+0x3f/0x60
[   12.030873]  __kasan_slab_free+0x56/0x70
[   12.031142]  kfree+0x222/0x3f0
[   12.031302]  rcu_uaf_reclaim+0x1f/0x60
[   12.031472]  rcu_core+0x66f/0x1c40
[   12.031633]  rcu_core_si+0x12/0x20
[   12.031793]  handle_softirqs+0x209/0x730
[   12.031963]  __irq_exit_rcu+0xc9/0x110
[   12.032315]  irq_exit_rcu+0x12/0x20
[   12.032486]  sysvec_apic_timer_interrupt+0x81/0x90
[   12.032696]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   12.032918] 
[   12.033046] Last potentially related work creation:
[   12.033215]  kasan_save_stack+0x45/0x70
[   12.033353]  kasan_record_aux_stack+0xb2/0xc0
[   12.033501]  __call_rcu_common.constprop.0+0x7b/0x9e0
[   12.033943]  call_rcu+0x12/0x20
[   12.034251]  rcu_uaf+0x168/0x330
[   12.034420]  kunit_try_run_case+0x1a5/0x480
[   12.034608]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.034971]  kthread+0x337/0x6f0
[   12.035356]  ret_from_fork+0x116/0x1d0
[   12.035742]  ret_from_fork_asm+0x1a/0x30
[   12.035900] 
[   12.035983] The buggy address belongs to the object at ffff888103109c00
[   12.035983]  which belongs to the cache kmalloc-32 of size 32
[   12.036941] The buggy address is located 0 bytes inside of
[   12.036941]  freed 32-byte region [ffff888103109c00, ffff888103109c20)
[   12.038547] 
[   12.038629] The buggy address belongs to the physical page:
[   12.038808] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103109
[   12.039089] flags: 0x200000000000000(node=0|zone=2)
[   12.039304] page_type: f5(slab)
[   12.039519] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   12.039825] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   12.040158] page dumped because: kasan: bad access detected
[   12.040864] 
[   12.040959] Memory state around the buggy address:
[   12.041231]  ffff888103109b00: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
[   12.041743]  ffff888103109b80: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc
[   12.042496] >ffff888103109c00: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   12.042791]                    ^
[   12.042961]  ffff888103109c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   12.043489]  ffff888103109d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   12.043792] ==================================================================