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Date
June 23, 2025, 1:39 p.m.

Environment
qemu-arm64
qemu-x86_64 

[   24.233551] ==================================================================
[   24.233667] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   24.233790] Read of size 1 at addr fff00000c7730000 by task kunit_try_catch/156
[   24.233913] 
[   24.234139] CPU: 0 UID: 0 PID: 156 Comm: kunit_try_catch Tainted: G    B            N  6.15.4-rc1 #1 PREEMPT 
[   24.234473] Tainted: [B]=BAD_PAGE, [N]=TEST
[   24.234618] Hardware name: linux,dummy-virt (DT)
[   24.234738] Call trace:
[   24.234832]  show_stack+0x20/0x38 (C)
[   24.235040]  dump_stack_lvl+0x8c/0xd0
[   24.235182]  print_report+0x118/0x608
[   24.235314]  kasan_report+0xdc/0x128
[   24.235464]  __asan_report_load1_noabort+0x20/0x30
[   24.235629]  page_alloc_uaf+0x328/0x350
[   24.235924]  kunit_try_run_case+0x170/0x3f0
[   24.236059]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   24.236191]  kthread+0x328/0x630
[   24.236305]  ret_from_fork+0x10/0x20
[   24.236443] 
[   24.236542] The buggy address belongs to the physical page:
[   24.236674] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107730
[   24.236841] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   24.236964] page_type: f0(buddy)
[   24.237149] raw: 0bfffe0000000000 fff00000ff616020 fff00000ff616020 0000000000000000
[   24.237343] raw: 0000000000000000 0000000000000004 00000000f0000000 0000000000000000
[   24.237505] page dumped because: kasan: bad access detected
[   24.237581] 
[   24.237624] Memory state around the buggy address:
[   24.237717]  fff00000c772ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   24.237902]  fff00000c772ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   24.238011] >fff00000c7730000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   24.238163]                    ^
[   24.238274]  fff00000c7730080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   24.238376]  fff00000c7730100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   24.238525] ==================================================================
Metadata Full log Test run details 

[   16.311295] ==================================================================
[   16.312580] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   16.313487] Read of size 1 at addr ffff88810a700000 by task kunit_try_catch/175
[   16.314068] 
[   16.314326] CPU: 0 UID: 0 PID: 175 Comm: kunit_try_catch Tainted: G    B            N  6.15.4-rc1 #1 PREEMPT(voluntary) 
[   16.314452] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.314489] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   16.314542] Call Trace:
[   16.314582]  <TASK>
[   16.315043]  dump_stack_lvl+0x73/0xb0
[   16.315125]  print_report+0xd1/0x650
[   16.315252]  ? __virt_addr_valid+0x1db/0x2d0
[   16.315313]  ? page_alloc_uaf+0x356/0x3d0
[   16.315344]  ? kasan_addr_to_slab+0x11/0xa0
[   16.315377]  ? page_alloc_uaf+0x356/0x3d0
[   16.315404]  kasan_report+0x141/0x180
[   16.315439]  ? page_alloc_uaf+0x356/0x3d0
[   16.315473]  __asan_report_load1_noabort+0x18/0x20
[   16.315505]  page_alloc_uaf+0x356/0x3d0
[   16.315531]  ? __pfx_page_alloc_uaf+0x10/0x10
[   16.315560]  ? __schedule+0x10cc/0x2b60
[   16.315594]  ? __pfx_read_tsc+0x10/0x10
[   16.315685]  ? ktime_get_ts64+0x86/0x230
[   16.315757]  kunit_try_run_case+0x1a5/0x480
[   16.315798]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.315833]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   16.315869]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   16.315904]  ? __kthread_parkme+0x82/0x180
[   16.315936]  ? preempt_count_sub+0x50/0x80
[   16.315973]  ? __pfx_kunit_try_run_case+0x10/0x10
[   16.316009]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   16.316042]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   16.316077]  kthread+0x337/0x6f0
[   16.316101]  ? trace_preempt_on+0x20/0xc0
[   16.316136]  ? __pfx_kthread+0x10/0x10
[   16.316162]  ? _raw_spin_unlock_irq+0x47/0x80
[   16.316194]  ? calculate_sigpending+0x7b/0xa0
[   16.316263]  ? __pfx_kthread+0x10/0x10
[   16.316296]  ret_from_fork+0x41/0x80
[   16.316330]  ? __pfx_kthread+0x10/0x10
[   16.316355]  ret_from_fork_asm+0x1a/0x30
[   16.316398]  </TASK>
[   16.316413] 
[   16.336387] The buggy address belongs to the physical page:
[   16.336832] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10a700
[   16.337946] flags: 0x200000000000000(node=0|zone=2)
[   16.338684] page_type: f0(buddy)
[   16.339140] raw: 0200000000000000 ffff88817fffc500 ffff88817fffc500 0000000000000000
[   16.340033] raw: 0000000000000000 0000000000000008 00000000f0000000 0000000000000000
[   16.341050] page dumped because: kasan: bad access detected
[   16.341656] 
[   16.341868] Memory state around the buggy address:
[   16.342315]  ffff88810a6fff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.342897]  ffff88810a6fff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.344169] >ffff88810a700000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.344828]                    ^
[   16.345331]  ffff88810a700080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.346226]  ffff88810a700100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.346863] ==================================================================
Metadata Full log Test run details