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Date
July 3, 2025, 10:10 a.m.

Environment
dragonboard-845c
qemu-arm64
qemu-x86_64 

[   33.258012] ==================================================================
[   33.269662] BUG: KASAN: use-after-free in kmalloc_large_uaf+0x2cc/0x2f8
[   33.276371] Read of size 1 at addr ffff000086190000 by task kunit_try_catch/257
[   33.283784] 
[   33.285315] CPU: 3 UID: 0 PID: 257 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4-next-20250703 #1 PREEMPT 
[   33.285343] Tainted: [B]=BAD_PAGE, [N]=TEST
[   33.285351] Hardware name: Thundercomm Dragonboard 845c (DT)
[   33.285362] Call trace:
[   33.285369]  show_stack+0x20/0x38 (C)
[   33.285387]  dump_stack_lvl+0x8c/0xd0
[   33.285407]  print_report+0x118/0x608
[   33.285427]  kasan_report+0xdc/0x128
[   33.285445]  __asan_report_load1_noabort+0x20/0x30
[   33.285463]  kmalloc_large_uaf+0x2cc/0x2f8
[   33.285480]  kunit_try_run_case+0x170/0x3f0
[   33.285499]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   33.285521]  kthread+0x328/0x630
[   33.285536]  ret_from_fork+0x10/0x20
[   33.285554] 
[   33.351176] The buggy address belongs to the physical page:
[   33.356829] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106190
[   33.364942] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   33.371563] raw: 0bfffe0000000000 fffffdffc2186508 ffff0000dae04c00 0000000000000000
[   33.379407] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[   33.387247] page dumped because: kasan: bad access detected
[   33.392901] 
[   33.394432] Memory state around the buggy address:
[   33.399295]  ffff00008618ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   33.406616]  ffff00008618ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   33.413939] >ffff000086190000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   33.421259]                    ^
[   33.424547]  ffff000086190080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   33.431862]  ffff000086190100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   33.439176] ==================================================================
Metadata Full log Test run details 

[   30.771586] ==================================================================
[   30.771649] BUG: KASAN: use-after-free in kmalloc_large_uaf+0x2cc/0x2f8
[   30.772213] Read of size 1 at addr fff00000c9bc0000 by task kunit_try_catch/180
[   30.772285] 
[   30.772479] CPU: 0 UID: 0 PID: 180 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4-next-20250703 #1 PREEMPT 
[   30.772613] Tainted: [B]=BAD_PAGE, [N]=TEST
[   30.772639] Hardware name: linux,dummy-virt (DT)
[   30.772995] Call trace:
[   30.773086]  show_stack+0x20/0x38 (C)
[   30.773221]  dump_stack_lvl+0x8c/0xd0
[   30.773315]  print_report+0x118/0x608
[   30.773367]  kasan_report+0xdc/0x128
[   30.773425]  __asan_report_load1_noabort+0x20/0x30
[   30.773632]  kmalloc_large_uaf+0x2cc/0x2f8
[   30.773853]  kunit_try_run_case+0x170/0x3f0
[   30.773916]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   30.774370]  kthread+0x328/0x630
[   30.774554]  ret_from_fork+0x10/0x20
[   30.774645] 
[   30.774666] The buggy address belongs to the physical page:
[   30.775036] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109bc0
[   30.775105] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   30.775171] raw: 0bfffe0000000000 ffffc1ffc326f108 fff00000da462c40 0000000000000000
[   30.775525] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[   30.775740] page dumped because: kasan: bad access detected
[   30.775888] 
[   30.776231] Memory state around the buggy address:
[   30.776409]  fff00000c9bbff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.776476]  fff00000c9bbff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.776525] >fff00000c9bc0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.776892]                    ^
[   30.777028]  fff00000c9bc0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.777073]  fff00000c9bc0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.777143] ==================================================================
Metadata Full log Test run details 

[   22.670827] ==================================================================
[   22.671416] BUG: KASAN: use-after-free in kmalloc_large_uaf+0x2f1/0x340
[   22.671775] Read of size 1 at addr ffff888105740000 by task kunit_try_catch/197
[   22.672071] 
[   22.672427] CPU: 0 UID: 0 PID: 197 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4-next-20250703 #1 PREEMPT(voluntary) 
[   22.672501] Tainted: [B]=BAD_PAGE, [N]=TEST
[   22.672514] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   22.672535] Call Trace:
[   22.672559]  <TASK>
[   22.672575]  dump_stack_lvl+0x73/0xb0
[   22.672605]  print_report+0xd1/0x650
[   22.672627]  ? __virt_addr_valid+0x1db/0x2d0
[   22.672651]  ? kmalloc_large_uaf+0x2f1/0x340
[   22.672670]  ? kasan_addr_to_slab+0x11/0xa0
[   22.672696]  ? kmalloc_large_uaf+0x2f1/0x340
[   22.672717]  kasan_report+0x141/0x180
[   22.672739]  ? kmalloc_large_uaf+0x2f1/0x340
[   22.672764]  __asan_report_load1_noabort+0x18/0x20
[   22.672799]  kmalloc_large_uaf+0x2f1/0x340
[   22.672819]  ? __pfx_kmalloc_large_uaf+0x10/0x10
[   22.672840]  ? __schedule+0x10cc/0x2b60
[   22.672876]  ? __pfx_read_tsc+0x10/0x10
[   22.672898]  ? ktime_get_ts64+0x86/0x230
[   22.672923]  kunit_try_run_case+0x1a5/0x480
[   22.672949]  ? __pfx_kunit_try_run_case+0x10/0x10
[   22.672980]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   22.673001]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   22.673026]  ? __kthread_parkme+0x82/0x180
[   22.673057]  ? preempt_count_sub+0x50/0x80
[   22.673081]  ? __pfx_kunit_try_run_case+0x10/0x10
[   22.673105]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   22.673128]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   22.673152]  kthread+0x337/0x6f0
[   22.673172]  ? trace_preempt_on+0x20/0xc0
[   22.673206]  ? __pfx_kthread+0x10/0x10
[   22.673226]  ? _raw_spin_unlock_irq+0x47/0x80
[   22.673263]  ? calculate_sigpending+0x7b/0xa0
[   22.673287]  ? __pfx_kthread+0x10/0x10
[   22.673308]  ret_from_fork+0x116/0x1d0
[   22.673327]  ? __pfx_kthread+0x10/0x10
[   22.673348]  ret_from_fork_asm+0x1a/0x30
[   22.673379]  </TASK>
[   22.673390] 
[   22.681846] The buggy address belongs to the physical page:
[   22.682111] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105740
[   22.682416] flags: 0x200000000000000(node=0|zone=2)
[   22.682657] raw: 0200000000000000 ffffea000415d108 ffff88815b039fc0 0000000000000000
[   22.682974] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[   22.683580] page dumped because: kasan: bad access detected
[   22.683786] 
[   22.683853] Memory state around the buggy address:
[   22.684005]  ffff88810573ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   22.684443]  ffff88810573ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   22.684760] >ffff888105740000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.685013]                    ^
[   22.685157]  ffff888105740080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.685452]  ffff888105740100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.685714] ==================================================================
Metadata Full log Test run details