Hay
Date
July 18, 2025, 1:09 p.m.

Environment
qemu-arm64
qemu-x86_64

[   32.734691] ==================================================================
[   32.734792] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x388/0x468
[   32.734874] Read of size 1 at addr fff00000c3ff1000 by task kunit_try_catch/244
[   32.734924] 
[   32.734968] CPU: 0 UID: 0 PID: 244 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6-next-20250718 #1 PREEMPT 
[   32.735058] Tainted: [B]=BAD_PAGE, [N]=TEST
[   32.737531] Hardware name: linux,dummy-virt (DT)
[   32.738102] Call trace:
[   32.738343]  show_stack+0x20/0x38 (C)
[   32.738748]  dump_stack_lvl+0x8c/0xd0
[   32.739459]  print_report+0x118/0x5e8
[   32.739908]  kasan_report+0xdc/0x128
[   32.740089]  __asan_report_load1_noabort+0x20/0x30
[   32.740520]  kmem_cache_rcu_uaf+0x388/0x468
[   32.741131]  kunit_try_run_case+0x170/0x3f0
[   32.741683]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   32.742092]  kthread+0x328/0x630
[   32.742686]  ret_from_fork+0x10/0x20
[   32.743125] 
[   32.743150] Allocated by task 244:
[   32.744203]  kasan_save_stack+0x3c/0x68
[   32.744497]  kasan_save_track+0x20/0x40
[   32.744579]  kasan_save_alloc_info+0x40/0x58
[   32.744656]  __kasan_slab_alloc+0xa8/0xb0
[   32.744969]  kmem_cache_alloc_noprof+0x10c/0x398
[   32.745335]  kmem_cache_rcu_uaf+0x12c/0x468
[   32.745392]  kunit_try_run_case+0x170/0x3f0
[   32.745430]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   32.745472]  kthread+0x328/0x630
[   32.745508]  ret_from_fork+0x10/0x20
[   32.745542] 
[   32.745567] Freed by task 0:
[   32.746044]  kasan_save_stack+0x3c/0x68
[   32.746375]  kasan_save_track+0x20/0x40
[   32.746422]  kasan_save_free_info+0x4c/0x78
[   32.746691]  __kasan_slab_free+0x6c/0x98
[   32.746858]  slab_free_after_rcu_debug+0xd4/0x2f8
[   32.746925]  rcu_core+0x9f4/0x1e58
[   32.746967]  rcu_core_si+0x18/0x30
[   32.747009]  handle_softirqs+0x374/0xb28
[   32.747048]  __do_softirq+0x1c/0x28
[   32.747434] 
[   32.747543] Last potentially related work creation:
[   32.747573]  kasan_save_stack+0x3c/0x68
[   32.747615]  kasan_record_aux_stack+0xb4/0xc8
[   32.747653]  kmem_cache_free+0x120/0x468
[   32.747690]  kmem_cache_rcu_uaf+0x16c/0x468
[   32.747737]  kunit_try_run_case+0x170/0x3f0
[   32.748587]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   32.748751]  kthread+0x328/0x630
[   32.748800]  ret_from_fork+0x10/0x20
[   32.748838] 
[   32.748857] The buggy address belongs to the object at fff00000c3ff1000
[   32.748857]  which belongs to the cache test_cache of size 200
[   32.749469] The buggy address is located 0 bytes inside of
[   32.749469]  freed 200-byte region [fff00000c3ff1000, fff00000c3ff10c8)
[   32.749758] 
[   32.749783] The buggy address belongs to the physical page:
[   32.749820] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103ff1
[   32.749879] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   32.749934] page_type: f5(slab)
[   32.749977] raw: 0bfffe0000000000 fff00000c4743780 dead000000000122 0000000000000000
[   32.750032] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000
[   32.750704] page dumped because: kasan: bad access detected
[   32.751000] 
[   32.751020] Memory state around the buggy address:
[   32.751242]  fff00000c3ff0f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   32.751378]  fff00000c3ff0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   32.751420] >fff00000c3ff1000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   32.751887]                    ^
[   32.751925]  fff00000c3ff1080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
[   32.751970]  fff00000c3ff1100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   32.752009] ==================================================================


[   25.656023] ==================================================================
[   25.656542] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x3e3/0x510
[   25.656891] Read of size 1 at addr ffff888102b0c000 by task kunit_try_catch/261
[   25.657565] 
[   25.657692] CPU: 1 UID: 0 PID: 261 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6-next-20250718 #1 PREEMPT(voluntary) 
[   25.657745] Tainted: [B]=BAD_PAGE, [N]=TEST
[   25.657757] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   25.657779] Call Trace:
[   25.657815]  <TASK>
[   25.657835]  dump_stack_lvl+0x73/0xb0
[   25.657870]  print_report+0xd1/0x640
[   25.657893]  ? __virt_addr_valid+0x1db/0x2d0
[   25.657919]  ? kmem_cache_rcu_uaf+0x3e3/0x510
[   25.657941]  ? kasan_complete_mode_report_info+0x64/0x200
[   25.657967]  ? kmem_cache_rcu_uaf+0x3e3/0x510
[   25.657989]  kasan_report+0x141/0x180
[   25.658011]  ? kmem_cache_rcu_uaf+0x3e3/0x510
[   25.658037]  __asan_report_load1_noabort+0x18/0x20
[   25.658060]  kmem_cache_rcu_uaf+0x3e3/0x510
[   25.658083]  ? __pfx_kmem_cache_rcu_uaf+0x10/0x10
[   25.658104]  ? finish_task_switch.isra.0+0x153/0x700
[   25.658126]  ? __switch_to+0x47/0xf80
[   25.658156]  ? __pfx_read_tsc+0x10/0x10
[   25.658178]  ? ktime_get_ts64+0x86/0x230
[   25.658203]  kunit_try_run_case+0x1a5/0x480
[   25.658241]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.658263]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   25.658287]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   25.658310]  ? __kthread_parkme+0x82/0x180
[   25.658330]  ? preempt_count_sub+0x50/0x80
[   25.658352]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.658375]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.658398]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   25.658421]  kthread+0x337/0x6f0
[   25.658439]  ? trace_preempt_on+0x20/0xc0
[   25.658463]  ? __pfx_kthread+0x10/0x10
[   25.658483]  ? _raw_spin_unlock_irq+0x47/0x80
[   25.658504]  ? calculate_sigpending+0x7b/0xa0
[   25.658528]  ? __pfx_kthread+0x10/0x10
[   25.658548]  ret_from_fork+0x116/0x1d0
[   25.658567]  ? __pfx_kthread+0x10/0x10
[   25.658586]  ret_from_fork_asm+0x1a/0x30
[   25.658618]  </TASK>
[   25.658633] 
[   25.667674] Allocated by task 261:
[   25.667988]  kasan_save_stack+0x45/0x70
[   25.668165]  kasan_save_track+0x18/0x40
[   25.668354]  kasan_save_alloc_info+0x3b/0x50
[   25.668540]  __kasan_slab_alloc+0x91/0xa0
[   25.668717]  kmem_cache_alloc_noprof+0x123/0x3f0
[   25.668901]  kmem_cache_rcu_uaf+0x155/0x510
[   25.669091]  kunit_try_run_case+0x1a5/0x480
[   25.669297]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.669517]  kthread+0x337/0x6f0
[   25.669657]  ret_from_fork+0x116/0x1d0
[   25.669840]  ret_from_fork_asm+0x1a/0x30
[   25.669994] 
[   25.670081] Freed by task 0:
[   25.670217]  kasan_save_stack+0x45/0x70
[   25.671115]  kasan_save_track+0x18/0x40
[   25.671278]  kasan_save_free_info+0x3f/0x60
[   25.671998]  __kasan_slab_free+0x56/0x70
[   25.672566]  slab_free_after_rcu_debug+0xe4/0x310
[   25.673271]  rcu_core+0x66f/0x1c40
[   25.673654]  rcu_core_si+0x12/0x20
[   25.673783]  handle_softirqs+0x209/0x730
[   25.674424]  __irq_exit_rcu+0xc9/0x110
[   25.675062]  irq_exit_rcu+0x12/0x20
[   25.675513]  sysvec_apic_timer_interrupt+0x81/0x90
[   25.675700]  asm_sysvec_apic_timer_interrupt+0x1f/0x30
[   25.676283] 
[   25.676451] Last potentially related work creation:
[   25.676897]  kasan_save_stack+0x45/0x70
[   25.677111]  kasan_record_aux_stack+0xb2/0xc0
[   25.677321]  kmem_cache_free+0x131/0x420
[   25.677497]  kmem_cache_rcu_uaf+0x194/0x510
[   25.677688]  kunit_try_run_case+0x1a5/0x480
[   25.677880]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.678114]  kthread+0x337/0x6f0
[   25.678274]  ret_from_fork+0x116/0x1d0
[   25.678450]  ret_from_fork_asm+0x1a/0x30
[   25.678631] 
[   25.678701] The buggy address belongs to the object at ffff888102b0c000
[   25.678701]  which belongs to the cache test_cache of size 200
[   25.679209] The buggy address is located 0 bytes inside of
[   25.679209]  freed 200-byte region [ffff888102b0c000, ffff888102b0c0c8)
[   25.679873] 
[   25.679949] The buggy address belongs to the physical page:
[   25.680199] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102b0c
[   25.680581] flags: 0x200000000000000(node=0|zone=2)
[   25.680908] page_type: f5(slab)
[   25.681108] raw: 0200000000000000 ffff8881012b1780 dead000000000122 0000000000000000
[   25.681442] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000
[   25.681767] page dumped because: kasan: bad access detected
[   25.682211] 
[   25.682296] Memory state around the buggy address:
[   25.682492]  ffff888102b0bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.683048]  ffff888102b0bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.683359] >ffff888102b0c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   25.683645]                    ^
[   25.683905]  ffff888102b0c080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
[   25.684213]  ffff888102b0c100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.684545] ==================================================================