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

Environment
qemu-arm64
qemu-x86_64 

[   16.656116] ==================================================================
[   16.656176] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   16.656241] Read of size 1 at addr fff00000c78c0000 by task kunit_try_catch/154
[   16.656291] 
[   16.656331] CPU: 1 UID: 0 PID: 154 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT 
[   16.656427] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.656453] Hardware name: linux,dummy-virt (DT)
[   16.656487] Call trace:
[   16.656511]  show_stack+0x20/0x38 (C)
[   16.656563]  dump_stack_lvl+0x8c/0xd0
[   16.656613]  print_report+0x118/0x608
[   16.656660]  kasan_report+0xdc/0x128
[   16.657731]  __asan_report_load1_noabort+0x20/0x30
[   16.658698]  page_alloc_uaf+0x328/0x350
[   16.658771]  kunit_try_run_case+0x170/0x3f0
[   16.658826]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   16.658952]  kthread+0x328/0x630
[   16.658998]  ret_from_fork+0x10/0x20
[   16.659144] 
[   16.659167] The buggy address belongs to the physical page:
[   16.659428] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1078c0
[   16.659685] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   16.659741] page_type: f0(buddy)
[   16.659782] raw: 0bfffe0000000000 fff00000ff616170 fff00000ff616170 0000000000000000
[   16.660496] raw: 0000000000000000 0000000000000006 00000000f0000000 0000000000000000
[   16.660574] page dumped because: kasan: bad access detected
[   16.660605] 
[   16.660624] Memory state around the buggy address:
[   16.660710]  fff00000c78bff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.660796]  fff00000c78bff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.661012] >fff00000c78c0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.661050]                    ^
[   16.661079]  fff00000c78c0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.661413]  fff00000c78c0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.661713] ==================================================================
Metadata Full log Test run details 

[   12.109689] ==================================================================
[   12.110439] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   12.110656] Read of size 1 at addr ffff8881039c0000 by task kunit_try_catch/171
[   12.110876] 
[   12.112087] CPU: 0 UID: 0 PID: 171 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   12.112143] Tainted: [B]=BAD_PAGE, [N]=TEST
[   12.112155] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   12.112174] Call Trace:
[   12.112186]  <TASK>
[   12.112200]  dump_stack_lvl+0x73/0xb0
[   12.112230]  print_report+0xd1/0x650
[   12.112252]  ? __virt_addr_valid+0x1db/0x2d0
[   12.112275]  ? page_alloc_uaf+0x356/0x3d0
[   12.112295]  ? kasan_addr_to_slab+0x11/0xa0
[   12.112316]  ? page_alloc_uaf+0x356/0x3d0
[   12.112337]  kasan_report+0x141/0x180
[   12.112358]  ? page_alloc_uaf+0x356/0x3d0
[   12.112384]  __asan_report_load1_noabort+0x18/0x20
[   12.112408]  page_alloc_uaf+0x356/0x3d0
[   12.112429]  ? __pfx_page_alloc_uaf+0x10/0x10
[   12.112451]  ? __schedule+0x10cc/0x2b60
[   12.112472]  ? __pfx_read_tsc+0x10/0x10
[   12.112492]  ? ktime_get_ts64+0x86/0x230
[   12.112516]  kunit_try_run_case+0x1a5/0x480
[   12.112540]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.112562]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   12.112585]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   12.112608]  ? __kthread_parkme+0x82/0x180
[   12.112627]  ? preempt_count_sub+0x50/0x80
[   12.112650]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.112673]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.112697]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   12.112722]  kthread+0x337/0x6f0
[   12.112740]  ? trace_preempt_on+0x20/0xc0
[   12.112762]  ? __pfx_kthread+0x10/0x10
[   12.112782]  ? _raw_spin_unlock_irq+0x47/0x80
[   12.112802]  ? calculate_sigpending+0x7b/0xa0
[   12.112826]  ? __pfx_kthread+0x10/0x10
[   12.112846]  ret_from_fork+0x116/0x1d0
[   12.112864]  ? __pfx_kthread+0x10/0x10
[   12.112884]  ret_from_fork_asm+0x1a/0x30
[   12.112914]  </TASK>
[   12.112923] 
[   12.125672] The buggy address belongs to the physical page:
[   12.125857] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1039c0
[   12.126618] flags: 0x200000000000000(node=0|zone=2)
[   12.127243] page_type: f0(buddy)
[   12.127530] raw: 0200000000000000 ffff88817fffb4f0 ffff88817fffb4f0 0000000000000000
[   12.127764] raw: 0000000000000000 0000000000000006 00000000f0000000 0000000000000000
[   12.128554] page dumped because: kasan: bad access detected
[   12.129142] 
[   12.129337] Memory state around the buggy address:
[   12.129724]  ffff8881039bff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.130234]  ffff8881039bff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.130836] >ffff8881039c0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.131367]                    ^
[   12.131489]  ffff8881039c0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.131703]  ffff8881039c0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.132294] ==================================================================
Metadata Full log Test run details