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Date
June 20, 2025, 12:38 p.m.

Environment
qemu-arm64
qemu-x86_64 

[   31.439984] ==================================================================
[   31.440277] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   31.440635] Read of size 1 at addr fff00000c59a0000 by task kunit_try_catch/165
[   31.440771] 
[   31.440863] CPU: 1 UID: 0 PID: 165 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc2-next-20250620 #1 PREEMPT 
[   31.441053] Tainted: [B]=BAD_PAGE, [N]=TEST
[   31.441107] Hardware name: linux,dummy-virt (DT)
[   31.441178] Call trace:
[   31.441231]  show_stack+0x20/0x38 (C)
[   31.441355]  dump_stack_lvl+0x8c/0xd0
[   31.441478]  print_report+0x118/0x608
[   31.441597]  kasan_report+0xdc/0x128
[   31.441741]  __asan_report_load1_noabort+0x20/0x30
[   31.441853]  page_alloc_uaf+0x328/0x350
[   31.442094]  kunit_try_run_case+0x170/0x3f0
[   31.442239]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   31.442373]  kthread+0x328/0x630
[   31.442469]  ret_from_fork+0x10/0x20
[   31.442589] 
[   31.442662] The buggy address belongs to the physical page:
[   31.442755] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1059a0
[   31.442914] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   31.443033] page_type: f0(buddy)
[   31.443193] raw: 0bfffe0000000000 fff00000ff616108 fff00000ff616108 0000000000000000
[   31.443380] raw: 0000000000000000 0000000000000005 00000000f0000000 0000000000000000
[   31.443545] page dumped because: kasan: bad access detected
[   31.443670] 
[   31.443734] Memory state around the buggy address:
[   31.443859]  fff00000c599ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   31.444015]  fff00000c599ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   31.444167] >fff00000c59a0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   31.444298]                    ^
[   31.444359]  fff00000c59a0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   31.444461]  fff00000c59a0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   31.444555] ==================================================================
Metadata Full log Test run details 

[   24.937368] ==================================================================
[   24.938510] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   24.939066] Read of size 1 at addr ffff888103990000 by task kunit_try_catch/183
[   24.939876] 
[   24.940067] CPU: 0 UID: 0 PID: 183 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc2-next-20250620 #1 PREEMPT(voluntary) 
[   24.940378] Tainted: [B]=BAD_PAGE, [N]=TEST
[   24.940412] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   24.940475] Call Trace:
[   24.940511]  <TASK>
[   24.940751]  dump_stack_lvl+0x73/0xb0
[   24.940851]  print_report+0xd1/0x650
[   24.940896]  ? __virt_addr_valid+0x1db/0x2d0
[   24.940933]  ? page_alloc_uaf+0x356/0x3d0
[   24.940957]  ? kasan_addr_to_slab+0x11/0xa0
[   24.940979]  ? page_alloc_uaf+0x356/0x3d0
[   24.941003]  kasan_report+0x141/0x180
[   24.941026]  ? page_alloc_uaf+0x356/0x3d0
[   24.941053]  __asan_report_load1_noabort+0x18/0x20
[   24.941079]  page_alloc_uaf+0x356/0x3d0
[   24.941102]  ? __pfx_page_alloc_uaf+0x10/0x10
[   24.941127]  ? __schedule+0x10cc/0x2b60
[   24.941177]  ? __pfx_read_tsc+0x10/0x10
[   24.941211]  ? ktime_get_ts64+0x86/0x230
[   24.941242]  kunit_try_run_case+0x1a5/0x480
[   24.941271]  ? __pfx_kunit_try_run_case+0x10/0x10
[   24.941295]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   24.941319]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   24.941344]  ? __kthread_parkme+0x82/0x180
[   24.941367]  ? preempt_count_sub+0x50/0x80
[   24.941393]  ? __pfx_kunit_try_run_case+0x10/0x10
[   24.941418]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   24.941462]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   24.941489]  kthread+0x337/0x6f0
[   24.941511]  ? trace_preempt_on+0x20/0xc0
[   24.941538]  ? __pfx_kthread+0x10/0x10
[   24.941594]  ? _raw_spin_unlock_irq+0x47/0x80
[   24.941639]  ? calculate_sigpending+0x7b/0xa0
[   24.941684]  ? __pfx_kthread+0x10/0x10
[   24.941711]  ret_from_fork+0x116/0x1d0
[   24.941733]  ? __pfx_kthread+0x10/0x10
[   24.941756]  ret_from_fork_asm+0x1a/0x30
[   24.941790]  </TASK>
[   24.941805] 
[   24.955046] The buggy address belongs to the physical page:
[   24.955965] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103990
[   24.956517] flags: 0x200000000000000(node=0|zone=2)
[   24.956746] page_type: f0(buddy)
[   24.957215] raw: 0200000000000000 ffff88817fffc460 ffff88817fffc460 0000000000000000
[   24.958018] raw: 0000000000000000 0000000000000004 00000000f0000000 0000000000000000
[   24.958813] page dumped because: kasan: bad access detected
[   24.959273] 
[   24.959457] Memory state around the buggy address:
[   24.959829]  ffff88810398ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   24.960796]  ffff88810398ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   24.961427] >ffff888103990000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   24.961855]                    ^
[   24.962176]  ffff888103990080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   24.962898]  ffff888103990100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   24.963282] ==================================================================
Metadata Full log Test run details