[   27.366726] ==================================================================
[   27.367418] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70
[   27.368460] Read of size 4 at addr fff00000c5752ec0 by task swapper/0/0
[   27.368719] 
[   27.369216] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G    B            N  6.16.0-rc3-next-20250626 #1 PREEMPT 
[   27.369660] Tainted: [B]=BAD_PAGE, [N]=TEST
[   27.370243] Hardware name: linux,dummy-virt (DT)
[   27.370424] Call trace:
[   27.370456]  show_stack+0x20/0x38 (C)
[   27.370610]  dump_stack_lvl+0x8c/0xd0
[   27.371228]  print_report+0x118/0x608
[   27.371296]  kasan_report+0xdc/0x128
[   27.371815]  __asan_report_load4_noabort+0x20/0x30
[   27.371874]  rcu_uaf_reclaim+0x64/0x70
[   27.371928]  rcu_core+0x9f4/0x1e20
[   27.371975]  rcu_core_si+0x18/0x30
[   27.372019]  handle_softirqs+0x374/0xb28
[   27.372075]  __do_softirq+0x1c/0x28
[   27.372472]  ____do_softirq+0x18/0x30
[   27.372634]  call_on_irq_stack+0x24/0x30
[   27.372781]  do_softirq_own_stack+0x24/0x38
[   27.372830]  __irq_exit_rcu+0x1fc/0x318
[   27.373097]  irq_exit_rcu+0x1c/0x80
[   27.373327]  el1_interrupt+0x38/0x58
[   27.373598]  el1h_64_irq_handler+0x18/0x28
[   27.373827]  el1h_64_irq+0x6c/0x70
[   27.374549]  arch_local_irq_enable+0x4/0x8 (P)
[   27.374792]  do_idle+0x384/0x4e8
[   27.374978]  cpu_startup_entry+0x68/0x80
[   27.375041]  rest_init+0x160/0x188
[   27.375099]  start_kernel+0x30c/0x3d0
[   27.375665]  __primary_switched+0x8c/0xa0
[   27.375724] 
[   27.375742] Allocated by task 210:
[   27.375782]  kasan_save_stack+0x3c/0x68
[   27.375823]  kasan_save_track+0x20/0x40
[   27.376362]  kasan_save_alloc_info+0x40/0x58
[   27.376410]  __kasan_kmalloc+0xd4/0xd8
[   27.376573]  __kmalloc_cache_noprof+0x16c/0x3c0
[   27.376616]  rcu_uaf+0xb0/0x2d8
[   27.376649]  kunit_try_run_case+0x170/0x3f0
[   27.377135]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   27.377183]  kthread+0x328/0x630
[   27.377222]  ret_from_fork+0x10/0x20
[   27.377717] 
[   27.377787] Freed by task 0:
[   27.378246]  kasan_save_stack+0x3c/0x68
[   27.378352]  kasan_save_track+0x20/0x40
[   27.378545]  kasan_save_free_info+0x4c/0x78
[   27.378585]  __kasan_slab_free+0x6c/0x98
[   27.378624]  kfree+0x214/0x3c8
[   27.379006]  rcu_uaf_reclaim+0x28/0x70
[   27.379196]  rcu_core+0x9f4/0x1e20
[   27.379240]  rcu_core_si+0x18/0x30
[   27.379276]  handle_softirqs+0x374/0xb28
[   27.379439]  __do_softirq+0x1c/0x28
[   27.379497] 
[   27.379751] Last potentially related work creation:
[   27.380036]  kasan_save_stack+0x3c/0x68
[   27.380109]  kasan_record_aux_stack+0xb4/0xc8
[   27.380265]  __call_rcu_common.constprop.0+0x74/0x8c8
[   27.380380]  call_rcu+0x18/0x30
[   27.380465]  rcu_uaf+0x14c/0x2d8
[   27.380631]  kunit_try_run_case+0x170/0x3f0
[   27.380755]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   27.380801]  kthread+0x328/0x630
[   27.380833]  ret_from_fork+0x10/0x20
[   27.380879] 
[   27.381607] The buggy address belongs to the object at fff00000c5752ec0
[   27.381607]  which belongs to the cache kmalloc-32 of size 32
[   27.381772] The buggy address is located 0 bytes inside of
[   27.381772]  freed 32-byte region [fff00000c5752ec0, fff00000c5752ee0)
[   27.381841] 
[   27.381862] The buggy address belongs to the physical page:
[   27.382419] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105752
[   27.382575] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   27.382642] page_type: f5(slab)
[   27.382997] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000
[   27.383063] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   27.383452] page dumped because: kasan: bad access detected
[   27.383763] 
[   27.383867] Memory state around the buggy address:
[   27.383903]  fff00000c5752d80: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
[   27.384220]  fff00000c5752e00: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc
[   27.384344] >fff00000c5752e80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   27.384381]                                            ^
[   27.384418]  fff00000c5752f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   27.384460]  fff00000c5752f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   27.384497] ==================================================================

[   22.675086] ==================================================================
[   22.675624] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60
[   22.675885] Read of size 4 at addr ffff8881024d9480 by task swapper/0/0
[   22.676106] 
[   22.676317] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G    B            N  6.16.0-rc3-next-20250626 #1 PREEMPT(voluntary) 
[   22.676376] Tainted: [B]=BAD_PAGE, [N]=TEST
[   22.676388] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   22.676413] Call Trace:
[   22.676445]  <IRQ>
[   22.676469]  dump_stack_lvl+0x73/0xb0
[   22.676505]  print_report+0xd1/0x650
[   22.676527]  ? __virt_addr_valid+0x1db/0x2d0
[   22.676553]  ? rcu_uaf_reclaim+0x50/0x60
[   22.676573]  ? kasan_complete_mode_report_info+0x64/0x200
[   22.676597]  ? rcu_uaf_reclaim+0x50/0x60
[   22.676617]  kasan_report+0x141/0x180
[   22.676638]  ? rcu_uaf_reclaim+0x50/0x60
[   22.676661]  __asan_report_load4_noabort+0x18/0x20
[   22.676684]  rcu_uaf_reclaim+0x50/0x60
[   22.676703]  rcu_core+0x66f/0x1c40
[   22.676733]  ? __pfx_rcu_core+0x10/0x10
[   22.676754]  ? ktime_get+0x6b/0x150
[   22.676780]  rcu_core_si+0x12/0x20
[   22.676799]  handle_softirqs+0x209/0x730
[   22.676821]  ? hrtimer_interrupt+0x2fe/0x780
[   22.676847]  ? __pfx_handle_softirqs+0x10/0x10
[   22.676871]  __irq_exit_rcu+0xc9/0x110
[   22.676891]  irq_exit_rcu+0x12/0x20
[   22.676910]  sysvec_apic_timer_interrupt+0x81/0x90
[   22.676934]  </IRQ>
[   22.676958]  <TASK>
[   22.676969]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   22.677174] RIP: 0010:pv_native_safe_halt+0xf/0x20
[   22.677407] 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 00 1a 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
[   22.677492] RSP: 0000:ffffffffb7807dd8 EFLAGS: 00010202
[   22.677582] RAX: ffff8881a242e000 RBX: ffffffffb781cac0 RCX: ffffffffb66eb105
[   22.677628] RDX: ffffed102b606193 RSI: 0000000000000004 RDI: 00000000000c26b4
[   22.677672] RBP: ffffffffb7807de0 R08: 0000000000000001 R09: ffffed102b606192
[   22.677714] R10: ffff88815b030c93 R11: 0000000000091000 R12: 0000000000000000
[   22.677757] R13: fffffbfff6f03958 R14: ffffffffb83eacd0 R15: 0000000000000000
[   22.678076]  ? ct_kernel_exit.constprop.0+0xa5/0xd0
[   22.678141]  ? default_idle+0xd/0x20
[   22.678163]  arch_cpu_idle+0xd/0x20
[   22.678183]  default_idle_call+0x48/0x80
[   22.678203]  do_idle+0x379/0x4f0
[   22.678245]  ? __pfx_do_idle+0x10/0x10
[   22.678272]  cpu_startup_entry+0x5c/0x70
[   22.678296]  rest_init+0x11a/0x140
[   22.678315]  ? acpi_subsystem_init+0x5d/0x150
[   22.678340]  start_kernel+0x352/0x400
[   22.678364]  x86_64_start_reservations+0x1c/0x30
[   22.678387]  x86_64_start_kernel+0x10d/0x120
[   22.678410]  common_startup_64+0x13e/0x148
[   22.678443]  </TASK>
[   22.678454] 
[   22.695180] Allocated by task 227:
[   22.695402]  kasan_save_stack+0x45/0x70
[   22.695569]  kasan_save_track+0x18/0x40
[   22.695755]  kasan_save_alloc_info+0x3b/0x50
[   22.695961]  __kasan_kmalloc+0xb7/0xc0
[   22.696422]  __kmalloc_cache_noprof+0x189/0x420
[   22.696586]  rcu_uaf+0xb0/0x330
[   22.696752]  kunit_try_run_case+0x1a5/0x480
[   22.697020]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   22.697459]  kthread+0x337/0x6f0
[   22.697627]  ret_from_fork+0x116/0x1d0
[   22.697786]  ret_from_fork_asm+0x1a/0x30
[   22.698335] 
[   22.698424] Freed by task 0:
[   22.698539]  kasan_save_stack+0x45/0x70
[   22.698739]  kasan_save_track+0x18/0x40
[   22.699209]  kasan_save_free_info+0x3f/0x60
[   22.699416]  __kasan_slab_free+0x56/0x70
[   22.699586]  kfree+0x222/0x3f0
[   22.699722]  rcu_uaf_reclaim+0x1f/0x60
[   22.699886]  rcu_core+0x66f/0x1c40
[   22.700472]  rcu_core_si+0x12/0x20
[   22.700654]  handle_softirqs+0x209/0x730
[   22.700807]  __irq_exit_rcu+0xc9/0x110
[   22.701185]  irq_exit_rcu+0x12/0x20
[   22.701335]  sysvec_apic_timer_interrupt+0x81/0x90
[   22.701571]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   22.702177] 
[   22.702327] Last potentially related work creation:
[   22.702517]  kasan_save_stack+0x45/0x70
[   22.702961]  kasan_record_aux_stack+0xb2/0xc0
[   22.703382]  __call_rcu_common.constprop.0+0x7b/0x9e0
[   22.703566]  call_rcu+0x12/0x20
[   22.703948]  rcu_uaf+0x168/0x330
[   22.704124]  kunit_try_run_case+0x1a5/0x480
[   22.704596]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   22.705086]  kthread+0x337/0x6f0
[   22.705271]  ret_from_fork+0x116/0x1d0
[   22.705531]  ret_from_fork_asm+0x1a/0x30
[   22.705773] 
[   22.706052] The buggy address belongs to the object at ffff8881024d9480
[   22.706052]  which belongs to the cache kmalloc-32 of size 32
[   22.706533] The buggy address is located 0 bytes inside of
[   22.706533]  freed 32-byte region [ffff8881024d9480, ffff8881024d94a0)
[   22.707332] 
[   22.707441] The buggy address belongs to the physical page:
[   22.707808] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1024d9
[   22.708314] flags: 0x200000000000000(node=0|zone=2)
[   22.708644] page_type: f5(slab)
[   22.708824] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   22.709180] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   22.710091] page dumped because: kasan: bad access detected
[   22.710364] 
[   22.710456] Memory state around the buggy address:
[   22.710674]  ffff8881024d9380: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   22.711346]  ffff8881024d9400: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   22.711727] >ffff8881024d9480: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
[   22.712264]                    ^
[   22.712457]  ffff8881024d9500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   22.712994]  ffff8881024d9580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   22.713289] ==================================================================