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Date
July 4, 2025, 11:11 p.m.

Environment
qemu-arm64
qemu-x86_64 

[   17.850281] ==================================================================
[   17.850339] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   17.850394] Read of size 1 at addr fff00000c7770000 by task kunit_try_catch/154
[   17.850442] 
[   17.850473] CPU: 0 UID: 0 PID: 154 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT 
[   17.850573] Tainted: [B]=BAD_PAGE, [N]=TEST
[   17.850609] Hardware name: linux,dummy-virt (DT)
[   17.850641] Call trace:
[   17.850671]  show_stack+0x20/0x38 (C)
[   17.850720]  dump_stack_lvl+0x8c/0xd0
[   17.850769]  print_report+0x118/0x608
[   17.850864]  kasan_report+0xdc/0x128
[   17.851049]  __asan_report_load1_noabort+0x20/0x30
[   17.851566]  page_alloc_uaf+0x328/0x350
[   17.851924]  kunit_try_run_case+0x170/0x3f0
[   17.851977]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   17.852246]  kthread+0x328/0x630
[   17.852488]  ret_from_fork+0x10/0x20
[   17.852698] 
[   17.852777] The buggy address belongs to the physical page:
[   17.852874] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107770
[   17.852927] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   17.853581] page_type: f0(buddy)
[   17.853638] raw: 0bfffe0000000000 fff00000ff6160a0 fff00000ff6160a0 0000000000000000
[   17.854164] raw: 0000000000000000 0000000000000004 00000000f0000000 0000000000000000
[   17.854399] page dumped because: kasan: bad access detected
[   17.854534] 
[   17.854573] Memory state around the buggy address:
[   17.855088]  fff00000c776ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   17.855544]  fff00000c776ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   17.855649] >fff00000c7770000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   17.855705]                    ^
[   17.855733]  fff00000c7770080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   17.855773]  fff00000c7770100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   17.856165] ==================================================================
Metadata Full log Test run details 

[   11.425002] ==================================================================
[   11.426032] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   11.426574] Read of size 1 at addr ffff8881039c0000 by task kunit_try_catch/171
[   11.427064] 
[   11.427188] CPU: 0 UID: 0 PID: 171 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   11.427254] Tainted: [B]=BAD_PAGE, [N]=TEST
[   11.427436] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   11.427461] Call Trace:
[   11.427479]  <TASK>
[   11.427500]  dump_stack_lvl+0x73/0xb0
[   11.427536]  print_report+0xd1/0x650
[   11.427559]  ? __virt_addr_valid+0x1db/0x2d0
[   11.427581]  ? page_alloc_uaf+0x356/0x3d0
[   11.427603]  ? kasan_addr_to_slab+0x11/0xa0
[   11.427622]  ? page_alloc_uaf+0x356/0x3d0
[   11.427642]  kasan_report+0x141/0x180
[   11.427663]  ? page_alloc_uaf+0x356/0x3d0
[   11.427689]  __asan_report_load1_noabort+0x18/0x20
[   11.427712]  page_alloc_uaf+0x356/0x3d0
[   11.427733]  ? __pfx_page_alloc_uaf+0x10/0x10
[   11.427754]  ? sysvec_apic_timer_interrupt+0x50/0x90
[   11.427777]  ? trace_hardirqs_on+0x37/0xe0
[   11.427799]  ? __pfx_read_tsc+0x10/0x10
[   11.427819]  ? ktime_get_ts64+0x86/0x230
[   11.427842]  kunit_try_run_case+0x1a5/0x480
[   11.427866]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.427889]  ? queued_spin_lock_slowpath+0x116/0xb40
[   11.427912]  ? __kthread_parkme+0x82/0x180
[   11.427931]  ? preempt_count_sub+0x50/0x80
[   11.427953]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.427975]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.427996]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   11.428017]  kthread+0x337/0x6f0
[   11.428035]  ? trace_preempt_on+0x20/0xc0
[   11.428055]  ? __pfx_kthread+0x10/0x10
[   11.428074]  ? _raw_spin_unlock_irq+0x47/0x80
[   11.428093]  ? calculate_sigpending+0x7b/0xa0
[   11.428115]  ? __pfx_kthread+0x10/0x10
[   11.428135]  ret_from_fork+0x116/0x1d0
[   11.428152]  ? __pfx_kthread+0x10/0x10
[   11.428171]  ret_from_fork_asm+0x1a/0x30
[   11.428200]  </TASK>
[   11.428211] 
[   11.438704] The buggy address belongs to the physical page:
[   11.439087] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1039c0
[   11.439662] flags: 0x200000000000000(node=0|zone=2)
[   11.439889] page_type: f0(buddy)
[   11.440037] raw: 0200000000000000 ffff88817fffb4f0 ffff88817fffb4f0 0000000000000000
[   11.440699] raw: 0000000000000000 0000000000000006 00000000f0000000 0000000000000000
[   11.441015] page dumped because: kasan: bad access detected
[   11.441319] 
[   11.441593] Memory state around the buggy address:
[   11.441813]  ffff8881039bff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.442109]  ffff8881039bff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.443019] >ffff8881039c0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.443329]                    ^
[   11.443611]  ffff8881039c0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.443917]  ffff8881039c0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.444204] ==================================================================
Metadata Full log Test run details