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Date
July 16, 2025, 12:11 p.m.

Environment
qemu-arm64
qemu-x86_64 

[   30.400329] ==================================================================
[   30.400383] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   30.400432] Read of size 1 at addr fff00000c9b40000 by task kunit_try_catch/185
[   30.400481] 
[   30.400526] CPU: 0 UID: 0 PID: 185 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6-next-20250716 #1 PREEMPT 
[   30.400609] Tainted: [B]=BAD_PAGE, [N]=TEST
[   30.400636] Hardware name: linux,dummy-virt (DT)
[   30.400690] Call trace:
[   30.400713]  show_stack+0x20/0x38 (C)
[   30.400760]  dump_stack_lvl+0x8c/0xd0
[   30.400814]  print_report+0x118/0x5d0
[   30.400866]  kasan_report+0xdc/0x128
[   30.400910]  __asan_report_load1_noabort+0x20/0x30
[   30.400958]  page_alloc_uaf+0x328/0x350
[   30.401003]  kunit_try_run_case+0x170/0x3f0
[   30.401055]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   30.401107]  kthread+0x328/0x630
[   30.401148]  ret_from_fork+0x10/0x20
[   30.401194] 
[   30.401212] The buggy address belongs to the physical page:
[   30.401242] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109b40
[   30.401293] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   30.401340] page_type: f0(buddy)
[   30.401376] raw: 0bfffe0000000000 fff00000ff6161b0 fff00000ff6161b0 0000000000000000
[   30.401430] raw: 0000000000000000 0000000000000006 00000000f0000000 0000000000000000
[   30.401471] page dumped because: kasan: bad access detected
[   30.401501] 
[   30.401528] Memory state around the buggy address:
[   30.401560]  fff00000c9b3ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.401604]  fff00000c9b3ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.401646] >fff00000c9b40000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.401684]                    ^
[   30.401719]  fff00000c9b40080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.401762]  fff00000c9b40100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.401799] ==================================================================
Metadata Full log Test run details 

[   22.841763] ==================================================================
[   22.842438] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   22.842660] Read of size 1 at addr ffff8881061d0000 by task kunit_try_catch/203
[   22.842877] 
[   22.842954] CPU: 1 UID: 0 PID: 203 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6-next-20250716 #1 PREEMPT(voluntary) 
[   22.843001] Tainted: [B]=BAD_PAGE, [N]=TEST
[   22.843013] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   22.843033] Call Trace:
[   22.843045]  <TASK>
[   22.843061]  dump_stack_lvl+0x73/0xb0
[   22.843089]  print_report+0xd1/0x610
[   22.843111]  ? __virt_addr_valid+0x1db/0x2d0
[   22.843133]  ? page_alloc_uaf+0x356/0x3d0
[   22.843154]  ? kasan_addr_to_slab+0x11/0xa0
[   22.843173]  ? page_alloc_uaf+0x356/0x3d0
[   22.843195]  kasan_report+0x141/0x180
[   22.843215]  ? page_alloc_uaf+0x356/0x3d0
[   22.843241]  __asan_report_load1_noabort+0x18/0x20
[   22.843275]  page_alloc_uaf+0x356/0x3d0
[   22.843296]  ? __pfx_page_alloc_uaf+0x10/0x10
[   22.843318]  ? __schedule+0x10c6/0x2b60
[   22.843340]  ? __pfx_read_tsc+0x10/0x10
[   22.843361]  ? ktime_get_ts64+0x86/0x230
[   22.843385]  kunit_try_run_case+0x1a5/0x480
[   22.843408]  ? __pfx_kunit_try_run_case+0x10/0x10
[   22.843429]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   22.843451]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   22.843473]  ? __kthread_parkme+0x82/0x180
[   22.843494]  ? preempt_count_sub+0x50/0x80
[   22.843517]  ? __pfx_kunit_try_run_case+0x10/0x10
[   22.843539]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   22.843565]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   22.843590]  kthread+0x337/0x6f0
[   22.843609]  ? trace_preempt_on+0x20/0xc0
[   22.843631]  ? __pfx_kthread+0x10/0x10
[   22.843651]  ? _raw_spin_unlock_irq+0x47/0x80
[   22.843671]  ? calculate_sigpending+0x7b/0xa0
[   22.843694]  ? __pfx_kthread+0x10/0x10
[   22.843715]  ret_from_fork+0x116/0x1d0
[   22.843733]  ? __pfx_kthread+0x10/0x10
[   22.843753]  ret_from_fork_asm+0x1a/0x30
[   22.843784]  </TASK>
[   22.843795] 
[   22.863690] The buggy address belongs to the physical page:
[   22.864127] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1061d0
[   22.865117] flags: 0x200000000000000(node=0|zone=2)
[   22.865813] page_type: f0(buddy)
[   22.866348] raw: 0200000000000000 ffff88817fffb460 ffff88817fffb460 0000000000000000
[   22.866589] raw: 0000000000000000 0000000000000004 00000000f0000000 0000000000000000
[   22.866827] page dumped because: kasan: bad access detected
[   22.866994] 
[   22.867058] Memory state around the buggy address:
[   22.867213]  ffff8881061cff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.867646]  ffff8881061cff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.868093] >ffff8881061d0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.868424]                    ^
[   22.868623]  ffff8881061d0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.869141]  ffff8881061d0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.869482] ==================================================================
Metadata Full log Test run details