[   15.939692] ==================================================================
[   15.939828] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70
[   15.939897] Read of size 4 at addr fff00000c6f01e80 by task ksoftirqd/0/15
[   15.939944] 
[   15.941668] CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Tainted: G    B            N  6.15.5-rc2 #1 PREEMPT 
[   15.941761] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.941786] Hardware name: linux,dummy-virt (DT)
[   15.941818] Call trace:
[   15.941844]  show_stack+0x20/0x38 (C)
[   15.941896]  dump_stack_lvl+0x8c/0xd0
[   15.941944]  print_report+0x118/0x608
[   15.941992]  kasan_report+0xdc/0x128
[   15.942037]  __asan_report_load4_noabort+0x20/0x30
[   15.942086]  rcu_uaf_reclaim+0x64/0x70
[   15.942130]  rcu_core+0x9f4/0x1e20
[   15.942176]  rcu_core_si+0x18/0x30
[   15.942218]  handle_softirqs+0x374/0xb28
[   15.942266]  run_ksoftirqd+0x80/0xb0
[   15.942308]  smpboot_thread_fn+0x2e8/0x760
[   15.942354]  kthread+0x328/0x630
[   15.942398]  ret_from_fork+0x10/0x20
[   15.942445] 
[   15.942463] Allocated by task 203:
[   15.942493]  kasan_save_stack+0x3c/0x68
[   15.942530]  kasan_save_track+0x20/0x40
[   15.942567]  kasan_save_alloc_info+0x40/0x58
[   15.942605]  __kasan_kmalloc+0xd4/0xd8
[   15.942648]  __kmalloc_cache_noprof+0x16c/0x3c0
[   15.942745]  rcu_uaf+0xb0/0x2d8
[   15.942781]  kunit_try_run_case+0x170/0x3f0
[   15.942833]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   15.942886]  kthread+0x328/0x630
[   15.942922]  ret_from_fork+0x10/0x20
[   15.942955] 
[   15.942975] Freed by task 15:
[   15.943000]  kasan_save_stack+0x3c/0x68
[   15.943044]  kasan_save_track+0x20/0x40
[   15.943086]  kasan_save_free_info+0x4c/0x78
[   15.943125]  __kasan_slab_free+0x6c/0x98
[   15.943167]  kfree+0x214/0x3c8
[   15.943207]  rcu_uaf_reclaim+0x28/0x70
[   15.943244]  rcu_core+0x9f4/0x1e20
[   15.943276]  rcu_core_si+0x18/0x30
[   15.943325]  handle_softirqs+0x374/0xb28
[   15.943359]  run_ksoftirqd+0x80/0xb0
[   15.943403]  smpboot_thread_fn+0x2e8/0x760
[   15.943439]  kthread+0x328/0x630
[   15.943474]  ret_from_fork+0x10/0x20
[   15.943509] 
[   15.943540] Last potentially related work creation:
[   15.943583]  kasan_save_stack+0x3c/0x68
[   15.943637]  kasan_record_aux_stack+0xb4/0xc8
[   15.943676]  __call_rcu_common.constprop.0+0x70/0x8b0
[   15.943717]  call_rcu+0x18/0x30
[   15.943750]  rcu_uaf+0x14c/0x2d8
[   15.943785]  kunit_try_run_case+0x170/0x3f0
[   15.943824]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   15.943877]  kthread+0x328/0x630
[   15.943920]  ret_from_fork+0x10/0x20
[   15.943960] 
[   15.944002] The buggy address belongs to the object at fff00000c6f01e80
[   15.944002]  which belongs to the cache kmalloc-32 of size 32
[   15.944075] The buggy address is located 0 bytes inside of
[   15.944075]  freed 32-byte region [fff00000c6f01e80, fff00000c6f01ea0)
[   15.944139] 
[   15.944166] The buggy address belongs to the physical page:
[   15.944208] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106f01
[   15.944260] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   15.944311] page_type: f5(slab)
[   15.944359] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000
[   15.944416] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   15.944457] page dumped because: kasan: bad access detected
[   15.944502] 
[   15.944519] Memory state around the buggy address:
[   15.944588]  fff00000c6f01d80: 00 00 00 fc fc fc fc fc 00 00 00 01 fc fc fc fc
[   15.944639]  fff00000c6f01e00: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   15.944682] >fff00000c6f01e80: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   15.944721]                    ^
[   15.944747]  fff00000c6f01f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.944789]  fff00000c6f01f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.944826] ==================================================================

[   15.044427] ==================================================================
[   15.044853] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60
[   15.045052] Read of size 4 at addr ffff8881029eef00 by task swapper/1/0
[   15.045386] 
[   15.045533] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G    B            N  6.15.5-rc2 #1 PREEMPT(voluntary) 
[   15.045630] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.045653] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   15.045698] Call Trace:
[   15.045763]  <IRQ>
[   15.045809]  dump_stack_lvl+0x73/0xb0
[   15.045870]  print_report+0xd1/0x650
[   15.045915]  ? __virt_addr_valid+0x1db/0x2d0
[   15.045969]  ? rcu_uaf_reclaim+0x50/0x60
[   15.046012]  ? kasan_complete_mode_report_info+0x64/0x200
[   15.046062]  ? rcu_uaf_reclaim+0x50/0x60
[   15.046105]  kasan_report+0x141/0x180
[   15.046147]  ? rcu_uaf_reclaim+0x50/0x60
[   15.046213]  __asan_report_load4_noabort+0x18/0x20
[   15.046266]  rcu_uaf_reclaim+0x50/0x60
[   15.046304]  rcu_core+0x66c/0x1c30
[   15.046364]  ? enqueue_hrtimer+0xfe/0x210
[   15.046410]  ? __pfx_rcu_core+0x10/0x10
[   15.046451]  ? ktime_get+0x6b/0x150
[   15.046489]  ? handle_softirqs+0x18e/0x730
[   15.046546]  rcu_core_si+0x12/0x20
[   15.046586]  handle_softirqs+0x209/0x730
[   15.046632]  ? hrtimer_interrupt+0x2fe/0x780
[   15.046688]  ? __pfx_handle_softirqs+0x10/0x10
[   15.046748]  __irq_exit_rcu+0xc9/0x110
[   15.046792]  irq_exit_rcu+0x12/0x20
[   15.046831]  sysvec_apic_timer_interrupt+0x81/0x90
[   15.046885]  </IRQ>
[   15.046949]  <TASK>
[   15.046971]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   15.047278] RIP: 0010:pv_native_safe_halt+0xf/0x20
[   15.047761] 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 43 ae 27 00 fb f4 <e9> fc 1f 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
[   15.047907] RSP: 0000:ffff88810086fdc8 EFLAGS: 00010216
[   15.048038] RAX: ffff8881a0992000 RBX: ffff8881008353c0 RCX: ffffffffb820ef55
[   15.048128] RDX: ffffed102b626103 RSI: 0000000000000004 RDI: 0000000000018dac
[   15.048198] RBP: ffff88810086fdd0 R08: 0000000000000001 R09: ffffed102b626102
[   15.048272] R10: ffff88815b130813 R11: 0000000000026800 R12: 0000000000000001
[   15.048349] R13: ffffed1020106a78 R14: ffffffffb9f9c210 R15: 0000000000000000
[   15.048430]  ? ct_kernel_exit.constprop.0+0xa5/0xd0
[   15.048475]  ? default_idle+0xd/0x20
[   15.048498]  arch_cpu_idle+0xd/0x20
[   15.048519]  default_idle_call+0x48/0x80
[   15.048539]  do_idle+0x379/0x4f0
[   15.048565]  ? __pfx_do_idle+0x10/0x10
[   15.048584]  ? _raw_spin_unlock_irqrestore+0x49/0x90
[   15.048612]  ? complete+0x15b/0x1d0
[   15.048637]  cpu_startup_entry+0x5c/0x70
[   15.048659]  start_secondary+0x211/0x290
[   15.048683]  ? __pfx_start_secondary+0x10/0x10
[   15.048709]  common_startup_64+0x13e/0x148
[   15.048744]  </TASK>
[   15.048758] 
[   15.065796] Allocated by task 219:
[   15.066377]  kasan_save_stack+0x45/0x70
[   15.066800]  kasan_save_track+0x18/0x40
[   15.067168]  kasan_save_alloc_info+0x3b/0x50
[   15.067698]  __kasan_kmalloc+0xb7/0xc0
[   15.068009]  __kmalloc_cache_noprof+0x189/0x420
[   15.068520]  rcu_uaf+0xb0/0x330
[   15.068835]  kunit_try_run_case+0x1a5/0x480
[   15.069705]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.070387]  kthread+0x337/0x6f0
[   15.070761]  ret_from_fork+0x41/0x80
[   15.070975]  ret_from_fork_asm+0x1a/0x30
[   15.071503] 
[   15.071708] Freed by task 0:
[   15.071880]  kasan_save_stack+0x45/0x70
[   15.072436]  kasan_save_track+0x18/0x40
[   15.072768]  kasan_save_free_info+0x3f/0x60
[   15.073115]  __kasan_slab_free+0x56/0x70
[   15.073620]  kfree+0x222/0x3f0
[   15.073945]  rcu_uaf_reclaim+0x1f/0x60
[   15.074355]  rcu_core+0x66c/0x1c30
[   15.074666]  rcu_core_si+0x12/0x20
[   15.074964]  handle_softirqs+0x209/0x730
[   15.075801]  __irq_exit_rcu+0xc9/0x110
[   15.076152]  irq_exit_rcu+0x12/0x20
[   15.076635]  sysvec_apic_timer_interrupt+0x81/0x90
[   15.076953]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   15.077484] 
[   15.077765] Last potentially related work creation:
[   15.078101]  kasan_save_stack+0x45/0x70
[   15.078654]  kasan_record_aux_stack+0xb2/0xc0
[   15.078933]  __call_rcu_common.constprop.0+0x72/0x9c0
[   15.079550]  call_rcu+0x12/0x20
[   15.079789]  rcu_uaf+0x168/0x330
[   15.080036]  kunit_try_run_case+0x1a5/0x480
[   15.080807]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   15.081129]  kthread+0x337/0x6f0
[   15.081373]  ret_from_fork+0x41/0x80
[   15.081678]  ret_from_fork_asm+0x1a/0x30
[   15.082081] 
[   15.082305] The buggy address belongs to the object at ffff8881029eef00
[   15.082305]  which belongs to the cache kmalloc-32 of size 32
[   15.083022] The buggy address is located 0 bytes inside of
[   15.083022]  freed 32-byte region [ffff8881029eef00, ffff8881029eef20)
[   15.083738] 
[   15.084088] The buggy address belongs to the physical page:
[   15.084569] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1029ee
[   15.085387] flags: 0x200000000000000(node=0|zone=2)
[   15.086552] page_type: f5(slab)
[   15.086896] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   15.087390] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   15.087914] page dumped because: kasan: bad access detected
[   15.088541] 
[   15.088755] Memory state around the buggy address:
[   15.089168]  ffff8881029eee00: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
[   15.089918]  ffff8881029eee80: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc
[   15.090506] >ffff8881029eef00: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   15.090736]                    ^
[   15.090885]  ffff8881029eef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   15.091786]  ffff8881029ef000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   15.092515] ==================================================================