Hay
Date
July 10, 2025, 6:10 p.m.

Environment
qemu-arm64
qemu-x86_64

[   17.101697] ==================================================================
[   17.101766] BUG: KASAN: double-free in kfree_sensitive+0x3c/0xb0
[   17.102521] Free of addr fff00000c4498e80 by task kunit_try_catch/192
[   17.102583] 
[   17.102809] CPU: 1 UID: 0 PID: 192 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT 
[   17.103020] Tainted: [B]=BAD_PAGE, [N]=TEST
[   17.103049] Hardware name: linux,dummy-virt (DT)
[   17.103286] Call trace:
[   17.103447]  show_stack+0x20/0x38 (C)
[   17.103638]  dump_stack_lvl+0x8c/0xd0
[   17.103920]  print_report+0x118/0x608
[   17.104038]  kasan_report_invalid_free+0xc0/0xe8
[   17.104251]  check_slab_allocation+0xd4/0x108
[   17.104429]  __kasan_slab_pre_free+0x2c/0x48
[   17.104616]  kfree+0xe8/0x3c8
[   17.104794]  kfree_sensitive+0x3c/0xb0
[   17.105282]  kmalloc_double_kzfree+0x168/0x308
[   17.105372]  kunit_try_run_case+0x170/0x3f0
[   17.105890]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   17.106001]  kthread+0x328/0x630
[   17.106053]  ret_from_fork+0x10/0x20
[   17.106160] 
[   17.106180] Allocated by task 192:
[   17.106231]  kasan_save_stack+0x3c/0x68
[   17.106301]  kasan_save_track+0x20/0x40
[   17.106352]  kasan_save_alloc_info+0x40/0x58
[   17.106403]  __kasan_kmalloc+0xd4/0xd8
[   17.106441]  __kmalloc_cache_noprof+0x16c/0x3c0
[   17.106481]  kmalloc_double_kzfree+0xb8/0x308
[   17.106519]  kunit_try_run_case+0x170/0x3f0
[   17.106566]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   17.106611]  kthread+0x328/0x630
[   17.106654]  ret_from_fork+0x10/0x20
[   17.106691] 
[   17.106709] Freed by task 192:
[   17.106733]  kasan_save_stack+0x3c/0x68
[   17.106770]  kasan_save_track+0x20/0x40
[   17.106808]  kasan_save_free_info+0x4c/0x78
[   17.106848]  __kasan_slab_free+0x6c/0x98
[   17.106887]  kfree+0x214/0x3c8
[   17.106919]  kfree_sensitive+0x80/0xb0
[   17.106957]  kmalloc_double_kzfree+0x11c/0x308
[   17.107004]  kunit_try_run_case+0x170/0x3f0
[   17.107058]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   17.107102]  kthread+0x328/0x630
[   17.107140]  ret_from_fork+0x10/0x20
[   17.107176] 
[   17.107194] The buggy address belongs to the object at fff00000c4498e80
[   17.107194]  which belongs to the cache kmalloc-16 of size 16
[   17.107251] The buggy address is located 0 bytes inside of
[   17.107251]  16-byte region [fff00000c4498e80, fff00000c4498e90)
[   17.107309] 
[   17.107358] The buggy address belongs to the physical page:
[   17.107410] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x104498
[   17.107469] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   17.107514] page_type: f5(slab)
[   17.107566] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000
[   17.107630] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000
[   17.107679] page dumped because: kasan: bad access detected
[   17.107710] 
[   17.107729] Memory state around the buggy address:
[   17.107759]  fff00000c4498d80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   17.107803]  fff00000c4498e00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   17.107844] >fff00000c4498e80: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   17.107883]                    ^
[   17.107912]  fff00000c4498f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   17.107953]  fff00000c4498f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   17.108001] ==================================================================

[   12.860582] ==================================================================
[   12.861158] BUG: KASAN: double-free in kfree_sensitive+0x2e/0x90
[   12.861450] Free of addr ffff888101debe80 by task kunit_try_catch/209
[   12.861647] 
[   12.861730] CPU: 0 UID: 0 PID: 209 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   12.861769] Tainted: [B]=BAD_PAGE, [N]=TEST
[   12.861780] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   12.861798] Call Trace:
[   12.861812]  <TASK>
[   12.861826]  dump_stack_lvl+0x73/0xb0
[   12.861853]  print_report+0xd1/0x650
[   12.861874]  ? __virt_addr_valid+0x1db/0x2d0
[   12.861896]  ? kasan_complete_mode_report_info+0x64/0x200
[   12.861919]  ? kfree_sensitive+0x2e/0x90
[   12.861939]  kasan_report_invalid_free+0x10a/0x130
[   12.861963]  ? kfree_sensitive+0x2e/0x90
[   12.861984]  ? kfree_sensitive+0x2e/0x90
[   12.862003]  check_slab_allocation+0x101/0x130
[   12.862026]  __kasan_slab_pre_free+0x28/0x40
[   12.862059]  kfree+0xf0/0x3f0
[   12.862079]  ? kfree_sensitive+0x2e/0x90
[   12.862101]  kfree_sensitive+0x2e/0x90
[   12.862120]  kmalloc_double_kzfree+0x19c/0x350
[   12.862375]  ? __pfx_kmalloc_double_kzfree+0x10/0x10
[   12.862400]  ? __schedule+0x10cc/0x2b60
[   12.862421]  ? __pfx_read_tsc+0x10/0x10
[   12.862442]  ? ktime_get_ts64+0x86/0x230
[   12.862465]  kunit_try_run_case+0x1a5/0x480
[   12.862490]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.862512]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   12.862536]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   12.862559]  ? __kthread_parkme+0x82/0x180
[   12.862579]  ? preempt_count_sub+0x50/0x80
[   12.862601]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.862626]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.862649]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   12.862674]  kthread+0x337/0x6f0
[   12.862692]  ? trace_preempt_on+0x20/0xc0
[   12.862715]  ? __pfx_kthread+0x10/0x10
[   12.862734]  ? _raw_spin_unlock_irq+0x47/0x80
[   12.862755]  ? calculate_sigpending+0x7b/0xa0
[   12.862778]  ? __pfx_kthread+0x10/0x10
[   12.862799]  ret_from_fork+0x116/0x1d0
[   12.862817]  ? __pfx_kthread+0x10/0x10
[   12.862876]  ret_from_fork_asm+0x1a/0x30
[   12.862906]  </TASK>
[   12.862916] 
[   12.870785] Allocated by task 209:
[   12.870966]  kasan_save_stack+0x45/0x70
[   12.871283]  kasan_save_track+0x18/0x40
[   12.871418]  kasan_save_alloc_info+0x3b/0x50
[   12.871564]  __kasan_kmalloc+0xb7/0xc0
[   12.871695]  __kmalloc_cache_noprof+0x189/0x420
[   12.871849]  kmalloc_double_kzfree+0xa9/0x350
[   12.872217]  kunit_try_run_case+0x1a5/0x480
[   12.872433]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.872691]  kthread+0x337/0x6f0
[   12.872862]  ret_from_fork+0x116/0x1d0
[   12.873181]  ret_from_fork_asm+0x1a/0x30
[   12.873470] 
[   12.873568] Freed by task 209:
[   12.873716]  kasan_save_stack+0x45/0x70
[   12.874115]  kasan_save_track+0x18/0x40
[   12.874338]  kasan_save_free_info+0x3f/0x60
[   12.874521]  __kasan_slab_free+0x56/0x70
[   12.874678]  kfree+0x222/0x3f0
[   12.874795]  kfree_sensitive+0x67/0x90
[   12.875219]  kmalloc_double_kzfree+0x12b/0x350
[   12.875461]  kunit_try_run_case+0x1a5/0x480
[   12.875664]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.876042]  kthread+0x337/0x6f0
[   12.876168]  ret_from_fork+0x116/0x1d0
[   12.876302]  ret_from_fork_asm+0x1a/0x30
[   12.876442] 
[   12.876516] The buggy address belongs to the object at ffff888101debe80
[   12.876516]  which belongs to the cache kmalloc-16 of size 16
[   12.876868] The buggy address is located 0 bytes inside of
[   12.876868]  16-byte region [ffff888101debe80, ffff888101debe90)
[   12.877370] 
[   12.877467] The buggy address belongs to the physical page:
[   12.877720] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101deb
[   12.878110] flags: 0x200000000000000(node=0|zone=2)
[   12.878349] page_type: f5(slab)
[   12.878483] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000
[   12.878714] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000
[   12.879044] page dumped because: kasan: bad access detected
[   12.879291] 
[   12.879381] Memory state around the buggy address:
[   12.879597]  ffff888101debd80: 00 02 fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   12.879904]  ffff888101debe00: 00 05 fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   12.880268] >ffff888101debe80: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   12.880528]                    ^
[   12.880640]  ffff888101debf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   12.881119]  ffff888101debf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   12.881764] ==================================================================