Hay
Date
July 15, 2025, 2:09 p.m.

Environment
qemu-arm64
qemu-x86_64

[   17.652268] ==================================================================
[   17.652322] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   17.652721] Read of size 1 at addr fff00000c78c0000 by task kunit_try_catch/156
[   17.652784] 
[   17.652939] CPU: 0 UID: 0 PID: 156 Comm: kunit_try_catch Tainted: G    B            N  6.15.7-rc1 #1 PREEMPT 
[   17.653033] Tainted: [B]=BAD_PAGE, [N]=TEST
[   17.653059] Hardware name: linux,dummy-virt (DT)
[   17.653417] Call trace:
[   17.653503]  show_stack+0x20/0x38 (C)
[   17.653557]  dump_stack_lvl+0x8c/0xd0
[   17.653911]  print_report+0x118/0x5d0
[   17.654152]  kasan_report+0xdc/0x128
[   17.654484]  __asan_report_load1_noabort+0x20/0x30
[   17.654692]  page_alloc_uaf+0x328/0x350
[   17.654835]  kunit_try_run_case+0x170/0x3f0
[   17.654935]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   17.655335]  kthread+0x328/0x630
[   17.655508]  ret_from_fork+0x10/0x20
[   17.655682] 
[   17.655740] The buggy address belongs to the physical page:
[   17.655879] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1078c0
[   17.656034] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   17.656215] page_type: f0(buddy)
[   17.656465] raw: 0bfffe0000000000 fff00000ff6160f0 fff00000ff6160f0 0000000000000000
[   17.656645] raw: 0000000000000000 0000000000000006 00000000f0000000 0000000000000000
[   17.656897] page dumped because: kasan: bad access detected
[   17.657636] 
[   17.657672] Memory state around the buggy address:
[   17.658061]  fff00000c78bff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   17.658157]  fff00000c78bff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   17.658254] >fff00000c78c0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   17.658333]                    ^
[   17.658369]  fff00000c78c0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   17.658423]  fff00000c78c0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   17.659216] ==================================================================

[   10.576570] ==================================================================
[   10.577459] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   10.577673] Read of size 1 at addr ffff8881039c0000 by task kunit_try_catch/173
[   10.578445] 
[   10.578763] CPU: 0 UID: 0 PID: 173 Comm: kunit_try_catch Tainted: G    B            N  6.15.7-rc1 #1 PREEMPT(voluntary) 
[   10.578826] Tainted: [B]=BAD_PAGE, [N]=TEST
[   10.578837] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   10.578855] Call Trace:
[   10.578866]  <TASK>
[   10.578889]  dump_stack_lvl+0x73/0xb0
[   10.578913]  print_report+0xd1/0x610
[   10.578935]  ? __virt_addr_valid+0x1db/0x2d0
[   10.578956]  ? page_alloc_uaf+0x356/0x3d0
[   10.578973]  ? kasan_addr_to_slab+0x11/0xa0
[   10.579027]  ? page_alloc_uaf+0x356/0x3d0
[   10.579046]  kasan_report+0x141/0x180
[   10.579067]  ? page_alloc_uaf+0x356/0x3d0
[   10.579090]  __asan_report_load1_noabort+0x18/0x20
[   10.579138]  page_alloc_uaf+0x356/0x3d0
[   10.579156]  ? __pfx_page_alloc_uaf+0x10/0x10
[   10.579185]  ? __schedule+0x10cc/0x2b60
[   10.579208]  ? __pfx_read_tsc+0x10/0x10
[   10.579231]  ? ktime_get_ts64+0x86/0x230
[   10.579255]  kunit_try_run_case+0x1a5/0x480
[   10.579275]  ? __pfx_kunit_try_run_case+0x10/0x10
[   10.579292]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   10.579315]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   10.579337]  ? __kthread_parkme+0x82/0x180
[   10.579361]  ? preempt_count_sub+0x50/0x80
[   10.579384]  ? __pfx_kunit_try_run_case+0x10/0x10
[   10.579403]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   10.579425]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   10.579446]  kthread+0x337/0x6f0
[   10.579462]  ? trace_preempt_on+0x20/0xc0
[   10.579484]  ? __pfx_kthread+0x10/0x10
[   10.579502]  ? _raw_spin_unlock_irq+0x47/0x80
[   10.579523]  ? calculate_sigpending+0x7b/0xa0
[   10.579547]  ? __pfx_kthread+0x10/0x10
[   10.579565]  ret_from_fork+0x41/0x80
[   10.579593]  ? __pfx_kthread+0x10/0x10
[   10.579610]  ret_from_fork_asm+0x1a/0x30
[   10.579645]  </TASK>
[   10.579655] 
[   10.588014] The buggy address belongs to the physical page:
[   10.588263] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1039c0
[   10.588545] flags: 0x200000000000000(node=0|zone=2)
[   10.589029] page_type: f0(buddy)
[   10.589212] raw: 0200000000000000 ffff88817fffc470 ffff88817fffc470 0000000000000000
[   10.589612] raw: 0000000000000000 0000000000000006 00000000f0000000 0000000000000000
[   10.590065] page dumped because: kasan: bad access detected
[   10.590351] 
[   10.590446] Memory state around the buggy address:
[   10.590773]  ffff8881039bff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   10.591103]  ffff8881039bff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   10.591463] >ffff8881039c0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   10.591893]                    ^
[   10.592065]  ffff8881039c0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   10.592451]  ffff8881039c0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   10.592848] ==================================================================