Hay
Date
July 25, 2025, 3:13 a.m.

Environment
qemu-arm64
qemu-x86_64

[   33.690148] ==================================================================
[   33.690226] BUG: KASAN: slab-use-after-free in kmem_cache_double_destroy+0x174/0x300
[   33.690301] Read of size 1 at addr fff00000c45173c0 by task kunit_try_catch/247
[   33.690351] 
[   33.690392] CPU: 0 UID: 0 PID: 247 Comm: kunit_try_catch Tainted: G    B   W        N  6.16.0-rc7-next-20250725 #1 PREEMPT 
[   33.690484] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST
[   33.690516] Hardware name: linux,dummy-virt (DT)
[   33.690551] Call trace:
[   33.690578]  show_stack+0x20/0x38 (C)
[   33.690630]  dump_stack_lvl+0x8c/0xd0
[   33.690696]  print_report+0x118/0x5e8
[   33.690740]  kasan_report+0xdc/0x128
[   33.690784]  __kasan_check_byte+0x54/0x70
[   33.690828]  kmem_cache_destroy+0x34/0x218
[   33.690878]  kmem_cache_double_destroy+0x174/0x300
[   33.690928]  kunit_try_run_case+0x170/0x3f0
[   33.690993]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   33.691045]  kthread+0x328/0x630
[   33.691088]  ret_from_fork+0x10/0x20
[   33.691150] 
[   33.691170] Allocated by task 247:
[   33.691200]  kasan_save_stack+0x3c/0x68
[   33.691241]  kasan_save_track+0x20/0x40
[   33.691277]  kasan_save_alloc_info+0x40/0x58
[   33.691314]  __kasan_slab_alloc+0xa8/0xb0
[   33.691350]  kmem_cache_alloc_noprof+0x10c/0x398
[   33.691391]  __kmem_cache_create_args+0x178/0x280
[   33.691432]  kmem_cache_double_destroy+0xc0/0x300
[   33.691473]  kunit_try_run_case+0x170/0x3f0
[   33.691510]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   33.691553]  kthread+0x328/0x630
[   33.691585]  ret_from_fork+0x10/0x20
[   33.691621] 
[   33.691653] Freed by task 247:
[   33.691680]  kasan_save_stack+0x3c/0x68
[   33.691716]  kasan_save_track+0x20/0x40
[   33.691749]  kasan_save_free_info+0x4c/0x78
[   33.691791]  __kasan_slab_free+0x7c/0xa8
[   33.691825]  kmem_cache_free+0x260/0x468
[   33.691864]  slab_kmem_cache_release+0x38/0x50
[   33.691902]  kmem_cache_release+0x1c/0x30
[   33.691940]  kobject_put+0x17c/0x420
[   33.691978]  sysfs_slab_release+0x1c/0x30
[   33.692014]  kmem_cache_destroy+0x118/0x218
[   33.692053]  kmem_cache_double_destroy+0x128/0x300
[   33.692092]  kunit_try_run_case+0x170/0x3f0
[   33.692129]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   33.692172]  kthread+0x328/0x630
[   33.692203]  ret_from_fork+0x10/0x20
[   33.692239] 
[   33.692261] The buggy address belongs to the object at fff00000c45173c0
[   33.692261]  which belongs to the cache kmem_cache of size 208
[   33.692317] The buggy address is located 0 bytes inside of
[   33.692317]  freed 208-byte region [fff00000c45173c0, fff00000c4517490)
[   33.692377] 
[   33.692400] The buggy address belongs to the physical page:
[   33.692443] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x104517
[   33.692502] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   33.692553] page_type: f5(slab)
[   33.692595] raw: 0bfffe0000000000 fff00000c0001000 dead000000000122 0000000000000000
[   33.692659] raw: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000
[   33.692705] page dumped because: kasan: bad access detected
[   33.692737] 
[   33.692757] Memory state around the buggy address:
[   33.692793]  fff00000c4517280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   33.692837]  fff00000c4517300: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
[   33.692881] >fff00000c4517380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
[   33.692921]                                            ^
[   33.692955]  fff00000c4517400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   33.692998]  fff00000c4517480: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   33.693037] ==================================================================

[   26.652924] ==================================================================
[   26.654191] BUG: KASAN: slab-use-after-free in kmem_cache_double_destroy+0x1bf/0x380
[   26.654475] Read of size 1 at addr ffff888106258140 by task kunit_try_catch/264
[   26.654706] 
[   26.654809] CPU: 1 UID: 0 PID: 264 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc7-next-20250725 #1 PREEMPT(voluntary) 
[   26.654863] Tainted: [B]=BAD_PAGE, [N]=TEST
[   26.654876] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   26.654899] Call Trace:
[   26.654914]  <TASK>
[   26.654934]  dump_stack_lvl+0x73/0xb0
[   26.654983]  print_report+0xd1/0x640
[   26.655007]  ? __virt_addr_valid+0x1db/0x2d0
[   26.655034]  ? kmem_cache_double_destroy+0x1bf/0x380
[   26.655058]  ? kasan_complete_mode_report_info+0x64/0x200
[   26.655086]  ? kmem_cache_double_destroy+0x1bf/0x380
[   26.655180]  kasan_report+0x141/0x180
[   26.655205]  ? kmem_cache_double_destroy+0x1bf/0x380
[   26.655247]  ? kmem_cache_double_destroy+0x1bf/0x380
[   26.655273]  __kasan_check_byte+0x3d/0x50
[   26.655297]  kmem_cache_destroy+0x25/0x1d0
[   26.655326]  kmem_cache_double_destroy+0x1bf/0x380
[   26.655352]  ? __pfx_kmem_cache_double_destroy+0x10/0x10
[   26.655377]  ? finish_task_switch.isra.0+0x153/0x700
[   26.655401]  ? __switch_to+0x47/0xf80
[   26.655432]  ? __pfx_read_tsc+0x10/0x10
[   26.655455]  ? ktime_get_ts64+0x86/0x230
[   26.655483]  kunit_try_run_case+0x1a5/0x480
[   26.655511]  ? __pfx_kunit_try_run_case+0x10/0x10
[   26.655535]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   26.655557]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   26.655585]  ? __kthread_parkme+0x82/0x180
[   26.655607]  ? preempt_count_sub+0x50/0x80
[   26.655632]  ? __pfx_kunit_try_run_case+0x10/0x10
[   26.655657]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   26.655692]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   26.655717]  kthread+0x337/0x6f0
[   26.655738]  ? trace_preempt_on+0x20/0xc0
[   26.655774]  ? __pfx_kthread+0x10/0x10
[   26.655795]  ? _raw_spin_unlock_irq+0x47/0x80
[   26.655861]  ? calculate_sigpending+0x7b/0xa0
[   26.655891]  ? __pfx_kthread+0x10/0x10
[   26.655914]  ret_from_fork+0x116/0x1d0
[   26.655934]  ? __pfx_kthread+0x10/0x10
[   26.655966]  ret_from_fork_asm+0x1a/0x30
[   26.656001]  </TASK>
[   26.656013] 
[   26.664719] Allocated by task 264:
[   26.665153]  kasan_save_stack+0x45/0x70
[   26.665454]  kasan_save_track+0x18/0x40
[   26.665659]  kasan_save_alloc_info+0x3b/0x50
[   26.666965]  __kasan_slab_alloc+0x91/0xa0
[   26.667503]  kmem_cache_alloc_noprof+0x123/0x3f0
[   26.667677]  __kmem_cache_create_args+0x169/0x240
[   26.667836]  kmem_cache_double_destroy+0xd5/0x380
[   26.668004]  kunit_try_run_case+0x1a5/0x480
[   26.668155]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   26.668327]  kthread+0x337/0x6f0
[   26.668444]  ret_from_fork+0x116/0x1d0
[   26.668573]  ret_from_fork_asm+0x1a/0x30
[   26.668708] 
[   26.668774] Freed by task 264:
[   26.668882]  kasan_save_stack+0x45/0x70
[   26.669318]  kasan_save_track+0x18/0x40
[   26.669756]  kasan_save_free_info+0x3f/0x60
[   26.670339]  __kasan_slab_free+0x5e/0x80
[   26.670848]  kmem_cache_free+0x249/0x420
[   26.671332]  slab_kmem_cache_release+0x2e/0x40
[   26.671875]  kmem_cache_release+0x16/0x20
[   26.672276]  kobject_put+0x181/0x450
[   26.672665]  sysfs_slab_release+0x16/0x20
[   26.673202]  kmem_cache_destroy+0xf0/0x1d0
[   26.673601]  kmem_cache_double_destroy+0x14e/0x380
[   26.674192]  kunit_try_run_case+0x1a5/0x480
[   26.674659]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   26.675297]  kthread+0x337/0x6f0
[   26.675634]  ret_from_fork+0x116/0x1d0
[   26.676110]  ret_from_fork_asm+0x1a/0x30
[   26.676509] 
[   26.676679] The buggy address belongs to the object at ffff888106258140
[   26.676679]  which belongs to the cache kmem_cache of size 208
[   26.677805] The buggy address is located 0 bytes inside of
[   26.677805]  freed 208-byte region [ffff888106258140, ffff888106258210)
[   26.678180] 
[   26.678249] The buggy address belongs to the physical page:
[   26.678434] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106258
[   26.678683] flags: 0x200000000000000(node=0|zone=2)
[   26.678849] page_type: f5(slab)
[   26.678984] raw: 0200000000000000 ffff888100041000 dead000000000122 0000000000000000
[   26.679222] raw: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000
[   26.679451] page dumped because: kasan: bad access detected
[   26.679623] 
[   26.679687] Memory state around the buggy address:
[   26.679843]  ffff888106258000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   26.680412]  ffff888106258080: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc
[   26.681200] >ffff888106258100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
[   26.681840]                                            ^
[   26.682511]  ffff888106258180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   26.683391]  ffff888106258200: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   26.684204] ==================================================================