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Date
July 12, 2025, 11:09 a.m.

Environment
qemu-arm64
qemu-x86_64 

[   19.026483] ==================================================================
[   19.026632] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   19.026774] Read of size 1 at addr fff00000c7920000 by task kunit_try_catch/155
[   19.026915] 
[   19.027002] CPU: 0 UID: 0 PID: 155 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT 
[   19.027207] Tainted: [B]=BAD_PAGE, [N]=TEST
[   19.027274] Hardware name: linux,dummy-virt (DT)
[   19.027350] Call trace:
[   19.027404]  show_stack+0x20/0x38 (C)
[   19.027525]  dump_stack_lvl+0x8c/0xd0
[   19.027642]  print_report+0x118/0x608
[   19.027771]  kasan_report+0xdc/0x128
[   19.028373]  __asan_report_load1_noabort+0x20/0x30
[   19.028542]  page_alloc_uaf+0x328/0x350
[   19.028645]  kunit_try_run_case+0x170/0x3f0
[   19.028794]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   19.029158]  kthread+0x328/0x630
[   19.029346]  ret_from_fork+0x10/0x20
[   19.029671] 
[   19.029726] The buggy address belongs to the physical page:
[   19.029793] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107920
[   19.029935] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   19.030058] page_type: f0(buddy)
[   19.030419] raw: 0bfffe0000000000 fff00000ff616108 fff00000ff616108 0000000000000000
[   19.030702] raw: 0000000000000000 0000000000000005 00000000f0000000 0000000000000000
[   19.030889] page dumped because: kasan: bad access detected
[   19.030972] 
[   19.031068] Memory state around the buggy address:
[   19.031144]  fff00000c791ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   19.031474]  fff00000c791ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   19.031596] >fff00000c7920000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   19.033548]                    ^
[   19.033764]  fff00000c7920080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   19.034340]  fff00000c7920100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   19.034718] ==================================================================
Metadata Full log Test run details 

[   12.217741] ==================================================================
[   12.218419] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   12.218682] Read of size 1 at addr ffff888103b00000 by task kunit_try_catch/172
[   12.219086] 
[   12.219205] CPU: 1 UID: 0 PID: 172 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   12.219247] Tainted: [B]=BAD_PAGE, [N]=TEST
[   12.219258] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   12.219278] Call Trace:
[   12.219290]  <TASK>
[   12.219306]  dump_stack_lvl+0x73/0xb0
[   12.219337]  print_report+0xd1/0x650
[   12.219359]  ? __virt_addr_valid+0x1db/0x2d0
[   12.219383]  ? page_alloc_uaf+0x356/0x3d0
[   12.219405]  ? kasan_addr_to_slab+0x11/0xa0
[   12.219425]  ? page_alloc_uaf+0x356/0x3d0
[   12.219447]  kasan_report+0x141/0x180
[   12.219469]  ? page_alloc_uaf+0x356/0x3d0
[   12.219495]  __asan_report_load1_noabort+0x18/0x20
[   12.219520]  page_alloc_uaf+0x356/0x3d0
[   12.219541]  ? __pfx_page_alloc_uaf+0x10/0x10
[   12.219565]  ? __schedule+0x10cc/0x2b60
[   12.219587]  ? __pfx_read_tsc+0x10/0x10
[   12.219609]  ? ktime_get_ts64+0x86/0x230
[   12.219634]  kunit_try_run_case+0x1a5/0x480
[   12.219860]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.219890]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   12.219915]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   12.219940]  ? __kthread_parkme+0x82/0x180
[   12.219961]  ? preempt_count_sub+0x50/0x80
[   12.219985]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.220009]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.220034]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   12.220059]  kthread+0x337/0x6f0
[   12.220710]  ? trace_preempt_on+0x20/0xc0
[   12.220739]  ? __pfx_kthread+0x10/0x10
[   12.220784]  ? _raw_spin_unlock_irq+0x47/0x80
[   12.220808]  ? calculate_sigpending+0x7b/0xa0
[   12.220832]  ? __pfx_kthread+0x10/0x10
[   12.220854]  ret_from_fork+0x116/0x1d0
[   12.220873]  ? __pfx_kthread+0x10/0x10
[   12.220895]  ret_from_fork_asm+0x1a/0x30
[   12.220929]  </TASK>
[   12.220942] 
[   12.231620] The buggy address belongs to the physical page:
[   12.231894] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103b00
[   12.232392] flags: 0x200000000000000(node=0|zone=2)
[   12.232899] page_type: f0(buddy)
[   12.233202] raw: 0200000000000000 ffff88817fffc580 ffff88817fffc580 0000000000000000
[   12.233964] raw: 0000000000000000 0000000000000008 00000000f0000000 0000000000000000
[   12.234381] page dumped because: kasan: bad access detected
[   12.234554] 
[   12.234625] Memory state around the buggy address:
[   12.234805]  ffff888103afff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.235108]  ffff888103afff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.235391] >ffff888103b00000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.235672]                    ^
[   12.236135]  ffff888103b00080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.236443]  ffff888103b00100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.236807] ==================================================================
Metadata Full log Test run details