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Date
July 19, 2025, 11:11 a.m.

Environment
qemu-arm64
qemu-x86_64 

[   15.098707] ==================================================================
[   15.098762] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   15.098814] Read of size 1 at addr fff00000c7710000 by task kunit_try_catch/155
[   15.098863] 
[   15.098896] CPU: 1 UID: 0 PID: 155 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6 #1 PREEMPT 
[   15.098982] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.099008] Hardware name: linux,dummy-virt (DT)
[   15.099039] Call trace:
[   15.099060]  show_stack+0x20/0x38 (C)
[   15.099108]  dump_stack_lvl+0x8c/0xd0
[   15.099153]  print_report+0x118/0x5d0
[   15.099198]  kasan_report+0xdc/0x128
[   15.099593]  __asan_report_load1_noabort+0x20/0x30
[   15.099650]  page_alloc_uaf+0x328/0x350
[   15.099790]  kunit_try_run_case+0x170/0x3f0
[   15.099855]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   15.099974]  kthread+0x328/0x630
[   15.100078]  ret_from_fork+0x10/0x20
[   15.100130] 
[   15.100242] The buggy address belongs to the physical page:
[   15.100328] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107710
[   15.100379] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   15.100433] page_type: f0(buddy)
[   15.100576] raw: 0bfffe0000000000 fff00000ff6160a0 fff00000ff6160a0 0000000000000000
[   15.100717] raw: 0000000000000000 0000000000000004 00000000f0000000 0000000000000000
[   15.100757] page dumped because: kasan: bad access detected
[   15.100792] 
[   15.100883] Memory state around the buggy address:
[   15.100950]  fff00000c770ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   15.101080]  fff00000c770ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   15.101122] >fff00000c7710000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   15.101158]                    ^
[   15.101185]  fff00000c7710080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   15.101225]  fff00000c7710100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   15.101260] ==================================================================
Metadata Full log Test run details 

[   11.651696] ==================================================================
[   11.652608] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   11.652882] Read of size 1 at addr ffff8881039c0000 by task kunit_try_catch/172
[   11.653427] 
[   11.653582] CPU: 1 UID: 0 PID: 172 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6 #1 PREEMPT(voluntary) 
[   11.653667] Tainted: [B]=BAD_PAGE, [N]=TEST
[   11.653679] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   11.653731] Call Trace:
[   11.653744]  <TASK>
[   11.653760]  dump_stack_lvl+0x73/0xb0
[   11.653802]  print_report+0xd1/0x610
[   11.653823]  ? __virt_addr_valid+0x1db/0x2d0
[   11.653846]  ? page_alloc_uaf+0x356/0x3d0
[   11.653866]  ? kasan_addr_to_slab+0x11/0xa0
[   11.653886]  ? page_alloc_uaf+0x356/0x3d0
[   11.653906]  kasan_report+0x141/0x180
[   11.653927]  ? page_alloc_uaf+0x356/0x3d0
[   11.653952]  __asan_report_load1_noabort+0x18/0x20
[   11.653976]  page_alloc_uaf+0x356/0x3d0
[   11.653996]  ? __pfx_page_alloc_uaf+0x10/0x10
[   11.654126]  ? __schedule+0x10cc/0x2b60
[   11.654150]  ? __pfx_read_tsc+0x10/0x10
[   11.654170]  ? ktime_get_ts64+0x86/0x230
[   11.654203]  kunit_try_run_case+0x1a5/0x480
[   11.654227]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.654249]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   11.654272]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   11.654295]  ? __kthread_parkme+0x82/0x180
[   11.654315]  ? preempt_count_sub+0x50/0x80
[   11.654339]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.654361]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.654384]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   11.654407]  kthread+0x337/0x6f0
[   11.654426]  ? trace_preempt_on+0x20/0xc0
[   11.654448]  ? __pfx_kthread+0x10/0x10
[   11.654467]  ? _raw_spin_unlock_irq+0x47/0x80
[   11.654488]  ? calculate_sigpending+0x7b/0xa0
[   11.654521]  ? __pfx_kthread+0x10/0x10
[   11.654541]  ret_from_fork+0x116/0x1d0
[   11.654559]  ? __pfx_kthread+0x10/0x10
[   11.654578]  ret_from_fork_asm+0x1a/0x30
[   11.654608]  </TASK>
[   11.654618] 
[   11.663836] The buggy address belongs to the physical page:
[   11.664106] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1039c0
[   11.664444] flags: 0x200000000000000(node=0|zone=2)
[   11.664770] page_type: f0(buddy)
[   11.664944] raw: 0200000000000000 ffff88817fffc4f0 ffff88817fffc4f0 0000000000000000
[   11.665330] raw: 0000000000000000 0000000000000006 00000000f0000000 0000000000000000
[   11.665580] page dumped because: kasan: bad access detected
[   11.665746] 
[   11.665867] Memory state around the buggy address:
[   11.666092]  ffff8881039bff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.666441]  ffff8881039bff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.666941] >ffff8881039c0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.667314]                    ^
[   11.667488]  ffff8881039c0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.667816]  ffff8881039c0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.668084] ==================================================================
Metadata Full log Test run details