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Date
July 2, 2025, 11:09 p.m.

Environment
qemu-arm64
qemu-x86_64 

[   18.003842] ==================================================================
[   18.003927] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   18.004000] Read of size 1 at addr fff00000c7890000 by task kunit_try_catch/154
[   18.004049] 
[   18.004091] CPU: 0 UID: 0 PID: 154 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT 
[   18.004173] Tainted: [B]=BAD_PAGE, [N]=TEST
[   18.004199] Hardware name: linux,dummy-virt (DT)
[   18.004232] Call trace:
[   18.004256]  show_stack+0x20/0x38 (C)
[   18.004308]  dump_stack_lvl+0x8c/0xd0
[   18.004359]  print_report+0x118/0x608
[   18.004405]  kasan_report+0xdc/0x128
[   18.004450]  __asan_report_load1_noabort+0x20/0x30
[   18.004500]  page_alloc_uaf+0x328/0x350
[   18.004545]  kunit_try_run_case+0x170/0x3f0
[   18.004608]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   18.004660]  kthread+0x328/0x630
[   18.004745]  ret_from_fork+0x10/0x20
[   18.004819] 
[   18.004842] The buggy address belongs to the physical page:
[   18.004873] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107890
[   18.004927] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   18.004979] page_type: f0(buddy)
[   18.005021] raw: 0bfffe0000000000 fff00000ff6160a0 fff00000ff6160a0 0000000000000000
[   18.005069] raw: 0000000000000000 0000000000000004 00000000f0000000 0000000000000000
[   18.005108] page dumped because: kasan: bad access detected
[   18.005138] 
[   18.005156] Memory state around the buggy address:
[   18.005188]  fff00000c788ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   18.005229]  fff00000c788ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   18.005270] >fff00000c7890000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   18.005306]                    ^
[   18.005334]  fff00000c7890080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   18.005374]  fff00000c7890100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   18.005411] ==================================================================
Metadata Full log Test run details 

[   10.982863] ==================================================================
[   10.983324] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   10.983590] Read of size 1 at addr ffff888103940000 by task kunit_try_catch/173
[   10.984463] 
[   10.984769] CPU: 0 UID: 0 PID: 173 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   10.984816] Tainted: [B]=BAD_PAGE, [N]=TEST
[   10.984828] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   10.984847] Call Trace:
[   10.984860]  <TASK>
[   10.984878]  dump_stack_lvl+0x73/0xb0
[   10.984906]  print_report+0xd1/0x650
[   10.984928]  ? __virt_addr_valid+0x1db/0x2d0
[   10.984952]  ? page_alloc_uaf+0x356/0x3d0
[   10.984972]  ? kasan_addr_to_slab+0x11/0xa0
[   10.984991]  ? page_alloc_uaf+0x356/0x3d0
[   10.985011]  kasan_report+0x141/0x180
[   10.985032]  ? page_alloc_uaf+0x356/0x3d0
[   10.985056]  __asan_report_load1_noabort+0x18/0x20
[   10.985079]  page_alloc_uaf+0x356/0x3d0
[   10.985099]  ? __pfx_page_alloc_uaf+0x10/0x10
[   10.985121]  ? __schedule+0x10cc/0x2b60
[   10.985141]  ? __pfx_read_tsc+0x10/0x10
[   10.985161]  ? ktime_get_ts64+0x86/0x230
[   10.985184]  kunit_try_run_case+0x1a5/0x480
[   10.985208]  ? __pfx_kunit_try_run_case+0x10/0x10
[   10.985228]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   10.985250]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   10.985271]  ? __kthread_parkme+0x82/0x180
[   10.985291]  ? preempt_count_sub+0x50/0x80
[   10.985313]  ? __pfx_kunit_try_run_case+0x10/0x10
[   10.985335]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   10.985356]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   10.985388]  kthread+0x337/0x6f0
[   10.985407]  ? trace_preempt_on+0x20/0xc0
[   10.985429]  ? __pfx_kthread+0x10/0x10
[   10.985448]  ? _raw_spin_unlock_irq+0x47/0x80
[   10.985467]  ? calculate_sigpending+0x7b/0xa0
[   10.985490]  ? __pfx_kthread+0x10/0x10
[   10.985510]  ret_from_fork+0x116/0x1d0
[   10.985526]  ? __pfx_kthread+0x10/0x10
[   10.985546]  ret_from_fork_asm+0x1a/0x30
[   10.985575]  </TASK>
[   10.985586] 
[   10.999459] The buggy address belongs to the physical page:
[   10.999674] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103940
[   10.999972] flags: 0x200000000000000(node=0|zone=2)
[   11.000445] page_type: f0(buddy)
[   11.000754] raw: 0200000000000000 ffff88817fffc4f0 ffff88817fffc4f0 0000000000000000
[   11.001523] raw: 0000000000000000 0000000000000006 00000000f0000000 0000000000000000
[   11.001914] page dumped because: kasan: bad access detected
[   11.002102] 
[   11.002186] Memory state around the buggy address:
[   11.002342]  ffff88810393ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.002565]  ffff88810393ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.002987] >ffff888103940000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.003556]                    ^
[   11.003860]  ffff888103940080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.004614]  ffff888103940100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.005403] ==================================================================
Metadata Full log Test run details