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Date
July 8, 2025, 7:07 p.m.

Environment
qemu-arm64
qemu-x86_64 

[   19.086736] ==================================================================
[   19.086808] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   19.087110] Read of size 1 at addr fff00000c7840000 by task kunit_try_catch/154
[   19.087277] 
[   19.087314] CPU: 1 UID: 0 PID: 154 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT 
[   19.087400] Tainted: [B]=BAD_PAGE, [N]=TEST
[   19.087426] Hardware name: linux,dummy-virt (DT)
[   19.087806] Call trace:
[   19.087891]  show_stack+0x20/0x38 (C)
[   19.087949]  dump_stack_lvl+0x8c/0xd0
[   19.087993]  print_report+0x118/0x608
[   19.088037]  kasan_report+0xdc/0x128
[   19.088081]  __asan_report_load1_noabort+0x20/0x30
[   19.088134]  page_alloc_uaf+0x328/0x350
[   19.088507]  kunit_try_run_case+0x170/0x3f0
[   19.088638]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   19.088972]  kthread+0x328/0x630
[   19.089060]  ret_from_fork+0x10/0x20
[   19.089263] 
[   19.089674] The buggy address belongs to the physical page:
[   19.089772] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107840
[   19.089942] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   19.089998] page_type: f0(buddy)
[   19.090286] raw: 0bfffe0000000000 fff00000ff616170 fff00000ff616170 0000000000000000
[   19.090393] raw: 0000000000000000 0000000000000006 00000000f0000000 0000000000000000
[   19.090475] page dumped because: kasan: bad access detected
[   19.090596] 
[   19.090614] Memory state around the buggy address:
[   19.090653]  fff00000c783ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   19.091096]  fff00000c783ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   19.091162] >fff00000c7840000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   19.091202]                    ^
[   19.091229]  fff00000c7840080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   19.091566]  fff00000c7840100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   19.091627] ==================================================================
Metadata Full log Test run details 

[   12.392833] ==================================================================
[   12.394920] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   12.395624] Read of size 1 at addr ffff888103a00000 by task kunit_try_catch/171
[   12.396238] 
[   12.396657] CPU: 0 UID: 0 PID: 171 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   12.396706] Tainted: [B]=BAD_PAGE, [N]=TEST
[   12.396718] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   12.396739] Call Trace:
[   12.396753]  <TASK>
[   12.396770]  dump_stack_lvl+0x73/0xb0
[   12.396803]  print_report+0xd1/0x650
[   12.396826]  ? __virt_addr_valid+0x1db/0x2d0
[   12.396849]  ? page_alloc_uaf+0x356/0x3d0
[   12.396870]  ? kasan_addr_to_slab+0x11/0xa0
[   12.396889]  ? page_alloc_uaf+0x356/0x3d0
[   12.396910]  kasan_report+0x141/0x180
[   12.396931]  ? page_alloc_uaf+0x356/0x3d0
[   12.396957]  __asan_report_load1_noabort+0x18/0x20
[   12.396979]  page_alloc_uaf+0x356/0x3d0
[   12.397000]  ? __pfx_page_alloc_uaf+0x10/0x10
[   12.397022]  ? __schedule+0x10cc/0x2b60
[   12.397058]  ? __pfx_read_tsc+0x10/0x10
[   12.397080]  ? ktime_get_ts64+0x86/0x230
[   12.397104]  kunit_try_run_case+0x1a5/0x480
[   12.397128]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.397149]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   12.397172]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   12.397194]  ? __kthread_parkme+0x82/0x180
[   12.397214]  ? preempt_count_sub+0x50/0x80
[   12.397237]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.397260]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.397282]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   12.397303]  kthread+0x337/0x6f0
[   12.397322]  ? trace_preempt_on+0x20/0xc0
[   12.397344]  ? __pfx_kthread+0x10/0x10
[   12.397363]  ? _raw_spin_unlock_irq+0x47/0x80
[   12.397384]  ? calculate_sigpending+0x7b/0xa0
[   12.397407]  ? __pfx_kthread+0x10/0x10
[   12.397428]  ret_from_fork+0x116/0x1d0
[   12.397445]  ? __pfx_kthread+0x10/0x10
[   12.397465]  ret_from_fork_asm+0x1a/0x30
[   12.397496]  </TASK>
[   12.397566] 
[   12.409678] The buggy address belongs to the physical page:
[   12.410220] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103a00
[   12.410987] flags: 0x200000000000000(node=0|zone=2)
[   12.411503] page_type: f0(buddy)
[   12.411835] raw: 0200000000000000 ffff88817fffc5c8 ffff88817fffc5c8 0000000000000000
[   12.412222] raw: 0000000000000000 0000000000000009 00000000f0000000 0000000000000000
[   12.412584] page dumped because: kasan: bad access detected
[   12.412942] 
[   12.413028] Memory state around the buggy address:
[   12.413232]  ffff8881039fff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.413713]  ffff8881039fff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.414026] >ffff888103a00000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.414404]                    ^
[   12.414556]  ffff888103a00080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.414893]  ffff888103a00100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.415267] ==================================================================
Metadata Full log Test run details