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Date
July 8, 2025, 11:10 a.m.

Environment
qemu-arm64
qemu-x86_64 

[   30.935757] ==================================================================
[   30.935830] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   30.935888] Read of size 1 at addr fff00000c9ae0000 by task kunit_try_catch/185
[   30.935939] 
[   30.935979] CPU: 0 UID: 0 PID: 185 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5-next-20250708 #1 PREEMPT 
[   30.936062] Tainted: [B]=BAD_PAGE, [N]=TEST
[   30.936088] Hardware name: linux,dummy-virt (DT)
[   30.936429] Call trace:
[   30.936493]  show_stack+0x20/0x38 (C)
[   30.936601]  dump_stack_lvl+0x8c/0xd0
[   30.936680]  print_report+0x118/0x5d0
[   30.936761]  kasan_report+0xdc/0x128
[   30.936832]  __asan_report_load1_noabort+0x20/0x30
[   30.936907]  page_alloc_uaf+0x328/0x350
[   30.937005]  kunit_try_run_case+0x170/0x3f0
[   30.937095]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   30.937181]  kthread+0x328/0x630
[   30.937260]  ret_from_fork+0x10/0x20
[   30.937352] 
[   30.937399] The buggy address belongs to the physical page:
[   30.937463] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109ae0
[   30.937534] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   30.937581] page_type: f0(buddy)
[   30.937618] raw: 0bfffe0000000000 fff00000ff616148 fff00000ff616148 0000000000000000
[   30.937666] raw: 0000000000000000 0000000000000005 00000000f0000000 0000000000000000
[   30.937705] page dumped because: kasan: bad access detected
[   30.937734] 
[   30.937752] Memory state around the buggy address:
[   30.937997]  fff00000c9adff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.938053]  fff00000c9adff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.938112] >fff00000c9ae0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.938251]                    ^
[   30.938304]  fff00000c9ae0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.938397]  fff00000c9ae0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.938459] ==================================================================
Metadata Full log Test run details 

[   22.931906] ==================================================================
[   22.932412] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   22.932648] Read of size 1 at addr ffff8881026f0000 by task kunit_try_catch/202
[   22.933373] 
[   22.933615] CPU: 0 UID: 0 PID: 202 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5-next-20250708 #1 PREEMPT(voluntary) 
[   22.933672] Tainted: [B]=BAD_PAGE, [N]=TEST
[   22.933685] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   22.933708] Call Trace:
[   22.933754]  <TASK>
[   22.933776]  dump_stack_lvl+0x73/0xb0
[   22.933836]  print_report+0xd1/0x610
[   22.933861]  ? __virt_addr_valid+0x1db/0x2d0
[   22.933888]  ? page_alloc_uaf+0x356/0x3d0
[   22.933910]  ? kasan_addr_to_slab+0x11/0xa0
[   22.933930]  ? page_alloc_uaf+0x356/0x3d0
[   22.933953]  kasan_report+0x141/0x180
[   22.933976]  ? page_alloc_uaf+0x356/0x3d0
[   22.934004]  __asan_report_load1_noabort+0x18/0x20
[   22.934030]  page_alloc_uaf+0x356/0x3d0
[   22.934076]  ? __pfx_page_alloc_uaf+0x10/0x10
[   22.934129]  ? __schedule+0x10cc/0x2b60
[   22.934159]  ? __pfx_read_tsc+0x10/0x10
[   22.934185]  ? ktime_get_ts64+0x86/0x230
[   22.934235]  kunit_try_run_case+0x1a5/0x480
[   22.934296]  ? __pfx_kunit_try_run_case+0x10/0x10
[   22.934316]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   22.934338]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   22.934367]  ? __kthread_parkme+0x82/0x180
[   22.934389]  ? preempt_count_sub+0x50/0x80
[   22.934443]  ? __pfx_kunit_try_run_case+0x10/0x10
[   22.934465]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   22.934503]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   22.934530]  kthread+0x337/0x6f0
[   22.934551]  ? trace_preempt_on+0x20/0xc0
[   22.934577]  ? __pfx_kthread+0x10/0x10
[   22.934600]  ? _raw_spin_unlock_irq+0x47/0x80
[   22.934627]  ? calculate_sigpending+0x7b/0xa0
[   22.934655]  ? __pfx_kthread+0x10/0x10
[   22.934678]  ret_from_fork+0x116/0x1d0
[   22.934698]  ? __pfx_kthread+0x10/0x10
[   22.934720]  ret_from_fork_asm+0x1a/0x30
[   22.934761]  </TASK>
[   22.934773] 
[   22.948922] The buggy address belongs to the physical page:
[   22.949172] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1026f0
[   22.949797] flags: 0x200000000000000(node=0|zone=2)
[   22.950317] page_type: f0(buddy)
[   22.950685] raw: 0200000000000000 ffff88817fffd460 ffff88817fffd460 0000000000000000
[   22.951196] raw: 0000000000000000 0000000000000004 00000000f0000000 0000000000000000
[   22.951931] page dumped because: kasan: bad access detected
[   22.952411] 
[   22.952592] Memory state around the buggy address:
[   22.952825]  ffff8881026eff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.953492]  ffff8881026eff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.953727] >ffff8881026f0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.954174]                    ^
[   22.954329]  ffff8881026f0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.954530]  ffff8881026f0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.954726] ==================================================================
Metadata Full log Test run details