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Date
July 9, 2025, 11:07 p.m.

Environment
qemu-arm64
qemu-x86_64 

[   16.474452] ==================================================================
[   16.474508] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   16.474564] Read of size 1 at addr fff00000c7750000 by task kunit_try_catch/154
[   16.474613] 
[   16.474650] CPU: 1 UID: 0 PID: 154 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT 
[   16.474731] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.474756] Hardware name: linux,dummy-virt (DT)
[   16.474787] Call trace:
[   16.474809]  show_stack+0x20/0x38 (C)
[   16.474858]  dump_stack_lvl+0x8c/0xd0
[   16.474907]  print_report+0x118/0x608
[   16.474987]  kasan_report+0xdc/0x128
[   16.475036]  __asan_report_load1_noabort+0x20/0x30
[   16.475086]  page_alloc_uaf+0x328/0x350
[   16.475621]  kunit_try_run_case+0x170/0x3f0
[   16.476467]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   16.477339]  kthread+0x328/0x630
[   16.477663]  ret_from_fork+0x10/0x20
[   16.478071] 
[   16.478157] The buggy address belongs to the physical page:
[   16.478568] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107750
[   16.478690] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   16.479077] page_type: f0(buddy)
[   16.479135] raw: 0bfffe0000000000 fff00000ff6160a0 fff00000ff6160a0 0000000000000000
[   16.479612] raw: 0000000000000000 0000000000000004 00000000f0000000 0000000000000000
[   16.479949] page dumped because: kasan: bad access detected
[   16.480082] 
[   16.480201] Memory state around the buggy address:
[   16.480238]  fff00000c774ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.480300]  fff00000c774ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.480350] >fff00000c7750000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.480635]                    ^
[   16.480740]  fff00000c7750080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.480866]  fff00000c7750100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.480906] ==================================================================
Metadata Full log Test run details 

[   12.151532] ==================================================================
[   12.152545] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   12.152869] Read of size 1 at addr ffff888103950000 by task kunit_try_catch/171
[   12.153333] 
[   12.153622] CPU: 0 UID: 0 PID: 171 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   12.153689] Tainted: [B]=BAD_PAGE, [N]=TEST
[   12.153712] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   12.153732] Call Trace:
[   12.153743]  <TASK>
[   12.153757]  dump_stack_lvl+0x73/0xb0
[   12.153786]  print_report+0xd1/0x650
[   12.153807]  ? __virt_addr_valid+0x1db/0x2d0
[   12.153829]  ? page_alloc_uaf+0x356/0x3d0
[   12.153871]  ? kasan_addr_to_slab+0x11/0xa0
[   12.153891]  ? page_alloc_uaf+0x356/0x3d0
[   12.153912]  kasan_report+0x141/0x180
[   12.153933]  ? page_alloc_uaf+0x356/0x3d0
[   12.153959]  __asan_report_load1_noabort+0x18/0x20
[   12.153983]  page_alloc_uaf+0x356/0x3d0
[   12.154004]  ? __pfx_page_alloc_uaf+0x10/0x10
[   12.154084]  ? sysvec_apic_timer_interrupt+0x50/0x90
[   12.154113]  ? trace_hardirqs_on+0x37/0xe0
[   12.154136]  ? __pfx_read_tsc+0x10/0x10
[   12.154156]  ? ktime_get_ts64+0x86/0x230
[   12.154179]  kunit_try_run_case+0x1a5/0x480
[   12.154203]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.154227]  ? queued_spin_lock_slowpath+0x116/0xb40
[   12.154251]  ? __kthread_parkme+0x82/0x180
[   12.154271]  ? preempt_count_sub+0x50/0x80
[   12.154294]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.154318]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.154342]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   12.154366]  kthread+0x337/0x6f0
[   12.154385]  ? trace_preempt_on+0x20/0xc0
[   12.154406]  ? __pfx_kthread+0x10/0x10
[   12.154426]  ? _raw_spin_unlock_irq+0x47/0x80
[   12.154447]  ? calculate_sigpending+0x7b/0xa0
[   12.154470]  ? __pfx_kthread+0x10/0x10
[   12.154490]  ret_from_fork+0x116/0x1d0
[   12.154508]  ? __pfx_kthread+0x10/0x10
[   12.154528]  ret_from_fork_asm+0x1a/0x30
[   12.154558]  </TASK>
[   12.154567] 
[   12.161890] The buggy address belongs to the physical page:
[   12.162173] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103950
[   12.162697] flags: 0x200000000000000(node=0|zone=2)
[   12.162878] page_type: f0(buddy)
[   12.163311] raw: 0200000000000000 ffff88817fffb460 ffff88817fffb460 0000000000000000
[   12.163590] raw: 0000000000000000 0000000000000004 00000000f0000000 0000000000000000
[   12.163868] page dumped because: kasan: bad access detected
[   12.164144] 
[   12.164239] Memory state around the buggy address:
[   12.164617]  ffff88810394ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.165046]  ffff88810394ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.165253] >ffff888103950000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.165755]                    ^
[   12.165906]  ffff888103950080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.166653]  ffff888103950100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.167305] ==================================================================
Metadata Full log Test run details