[   13.098145] ==================================================================
[   13.098601] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60
[   13.099164] Read of size 4 at addr ffff8881038d4380 by task swapper/1/0
[   13.099381] 
[   13.099762] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   13.099809] Tainted: [B]=BAD_PAGE, [N]=TEST
[   13.099820] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   13.099840] Call Trace:
[   13.099868]  <IRQ>
[   13.099885]  dump_stack_lvl+0x73/0xb0
[   13.099917]  print_report+0xd1/0x650
[   13.099939]  ? __virt_addr_valid+0x1db/0x2d0
[   13.099962]  ? rcu_uaf_reclaim+0x50/0x60
[   13.099981]  ? kasan_complete_mode_report_info+0x64/0x200
[   13.100004]  ? rcu_uaf_reclaim+0x50/0x60
[   13.100087]  kasan_report+0x141/0x180
[   13.100112]  ? rcu_uaf_reclaim+0x50/0x60
[   13.100138]  __asan_report_load4_noabort+0x18/0x20
[   13.100162]  rcu_uaf_reclaim+0x50/0x60
[   13.100183]  rcu_core+0x66f/0x1c40
[   13.100211]  ? __pfx_rcu_core+0x10/0x10
[   13.100232]  ? ktime_get+0x6b/0x150
[   13.100254]  ? handle_softirqs+0x18e/0x730
[   13.100279]  rcu_core_si+0x12/0x20
[   13.100299]  handle_softirqs+0x209/0x730
[   13.100325]  ? hrtimer_interrupt+0x2fe/0x780
[   13.100348]  ? __pfx_handle_softirqs+0x10/0x10
[   13.100374]  __irq_exit_rcu+0xc9/0x110
[   13.100394]  irq_exit_rcu+0x12/0x20
[   13.100414]  sysvec_apic_timer_interrupt+0x81/0x90
[   13.100439]  </IRQ>
[   13.100466]  <TASK>
[   13.100477]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   13.100568] RIP: 0010:pv_native_safe_halt+0xf/0x20
[   13.100787] 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
[   13.100868] RSP: 0000:ffff888100877dc8 EFLAGS: 00010212
[   13.100954] RAX: ffff8881cc572000 RBX: ffff888100853000 RCX: ffffffff8c674105
[   13.100999] RDX: ffffed102b62618b RSI: 0000000000000004 RDI: 000000000001ebbc
[   13.101091] RBP: ffff888100877dd0 R08: 0000000000000001 R09: ffffed102b62618a
[   13.101138] R10: ffff88815b130c53 R11: ffffffff8ebc36c0 R12: 0000000000000001
[   13.101180] R13: ffffed102010a600 R14: ffffffff8e3b1390 R15: 0000000000000000
[   13.101239]  ? ct_kernel_exit.constprop.0+0xa5/0xd0
[   13.101294]  ? default_idle+0xd/0x20
[   13.101316]  arch_cpu_idle+0xd/0x20
[   13.101337]  default_idle_call+0x48/0x80
[   13.101356]  do_idle+0x379/0x4f0
[   13.101378]  ? complete+0x15b/0x1d0
[   13.101395]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   13.101421]  ? __pfx_do_idle+0x10/0x10
[   13.101441]  ? _raw_spin_unlock_irqrestore+0x49/0x90
[   13.101465]  ? complete+0x15b/0x1d0
[   13.101487]  cpu_startup_entry+0x5c/0x70
[   13.101506]  start_secondary+0x211/0x290
[   13.101528]  ? __pfx_start_secondary+0x10/0x10
[   13.101555]  common_startup_64+0x13e/0x148
[   13.101588]  </TASK>
[   13.101598] 
[   13.116532] Allocated by task 215:
[   13.116674]  kasan_save_stack+0x45/0x70
[   13.117349]  kasan_save_track+0x18/0x40
[   13.117655]  kasan_save_alloc_info+0x3b/0x50
[   13.117828]  __kasan_kmalloc+0xb7/0xc0
[   13.118011]  __kmalloc_cache_noprof+0x189/0x420
[   13.118492]  rcu_uaf+0xb0/0x330
[   13.119776]  kunit_try_run_case+0x1a5/0x480
[   13.120163]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.120470]  kthread+0x337/0x6f0
[   13.120592]  ret_from_fork+0x116/0x1d0
[   13.120811]  ret_from_fork_asm+0x1a/0x30
[   13.121185] 
[   13.121569] Freed by task 0:
[   13.122019]  kasan_save_stack+0x45/0x70
[   13.122682]  kasan_save_track+0x18/0x40
[   13.123137]  kasan_save_free_info+0x3f/0x60
[   13.123292]  __kasan_slab_free+0x56/0x70
[   13.123430]  kfree+0x222/0x3f0
[   13.123546]  rcu_uaf_reclaim+0x1f/0x60
[   13.123678]  rcu_core+0x66f/0x1c40
[   13.124384]  rcu_core_si+0x12/0x20
[   13.124729]  handle_softirqs+0x209/0x730
[   13.125256]  __irq_exit_rcu+0xc9/0x110
[   13.125722]  irq_exit_rcu+0x12/0x20
[   13.126191]  sysvec_apic_timer_interrupt+0x81/0x90
[   13.126711]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   13.127327] 
[   13.127507] Last potentially related work creation:
[   13.127671]  kasan_save_stack+0x45/0x70
[   13.127830]  kasan_record_aux_stack+0xb2/0xc0
[   13.127983]  __call_rcu_common.constprop.0+0x7b/0x9e0
[   13.128611]  call_rcu+0x12/0x20
[   13.128940]  rcu_uaf+0x168/0x330
[   13.129300]  kunit_try_run_case+0x1a5/0x480
[   13.129749]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   13.130310]  kthread+0x337/0x6f0
[   13.130686]  ret_from_fork+0x116/0x1d0
[   13.131167]  ret_from_fork_asm+0x1a/0x30
[   13.131556] 
[   13.131740] The buggy address belongs to the object at ffff8881038d4380
[   13.131740]  which belongs to the cache kmalloc-32 of size 32
[   13.132618] The buggy address is located 0 bytes inside of
[   13.132618]  freed 32-byte region [ffff8881038d4380, ffff8881038d43a0)
[   13.132975] 
[   13.133329] The buggy address belongs to the physical page:
[   13.133959] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1038d4
[   13.134823] flags: 0x200000000000000(node=0|zone=2)
[   13.135525] page_type: f5(slab)
[   13.135868] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   13.136670] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   13.137040] page dumped because: kasan: bad access detected
[   13.137317] 
[   13.137491] Memory state around the buggy address:
[   13.137960]  ffff8881038d4280: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
[   13.138743]  ffff8881038d4300: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc
[   13.139385] >ffff8881038d4380: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   13.139776]                    ^
[   13.139890]  ffff8881038d4400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   13.140261]  ffff8881038d4480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   13.141071] ==================================================================