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Date
July 17, 2025, 10:12 a.m.

Environment
qemu-arm64
qemu-x86_64 

[   29.371015] ==================================================================
[   29.371104] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   29.371297] Read of size 1 at addr fff00000c9af0000 by task kunit_try_catch/185
[   29.371394] 
[   29.371429] CPU: 1 UID: 0 PID: 185 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6-next-20250717 #1 PREEMPT 
[   29.371573] Tainted: [B]=BAD_PAGE, [N]=TEST
[   29.371599] Hardware name: linux,dummy-virt (DT)
[   29.371646] Call trace:
[   29.371962]  show_stack+0x20/0x38 (C)
[   29.372097]  dump_stack_lvl+0x8c/0xd0
[   29.372172]  print_report+0x118/0x5d0
[   29.372272]  kasan_report+0xdc/0x128
[   29.372317]  __asan_report_load1_noabort+0x20/0x30
[   29.372499]  page_alloc_uaf+0x328/0x350
[   29.372567]  kunit_try_run_case+0x170/0x3f0
[   29.372643]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   29.372920]  kthread+0x328/0x630
[   29.373078]  ret_from_fork+0x10/0x20
[   29.373282] 
[   29.373391] The buggy address belongs to the physical page:
[   29.373494] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109af0
[   29.373570] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   29.373761] page_type: f0(buddy)
[   29.374030] raw: 0bfffe0000000000 fff00000ff6160e0 fff00000ff6160e0 0000000000000000
[   29.374231] raw: 0000000000000000 0000000000000004 00000000f0000000 0000000000000000
[   29.374402] page dumped because: kasan: bad access detected
[   29.374530] 
[   29.374626] Memory state around the buggy address:
[   29.374703]  fff00000c9aeff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   29.374797]  fff00000c9aeff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   29.374905] >fff00000c9af0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   29.374976]                    ^
[   29.375048]  fff00000c9af0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   29.375386]  fff00000c9af0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   29.375510] ==================================================================
Metadata Full log Test run details 

[   25.278876] ==================================================================
[   25.279711] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   25.279970] Read of size 1 at addr ffff8881061c0000 by task kunit_try_catch/203
[   25.280269] 
[   25.280364] CPU: 0 UID: 0 PID: 203 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6-next-20250717 #1 PREEMPT(voluntary) 
[   25.280649] Tainted: [B]=BAD_PAGE, [N]=TEST
[   25.280663] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   25.280685] Call Trace:
[   25.280697]  <TASK>
[   25.280714]  dump_stack_lvl+0x73/0xb0
[   25.280745]  print_report+0xd1/0x610
[   25.280766]  ? __virt_addr_valid+0x1db/0x2d0
[   25.280789]  ? page_alloc_uaf+0x356/0x3d0
[   25.280809]  ? kasan_addr_to_slab+0x11/0xa0
[   25.280828]  ? page_alloc_uaf+0x356/0x3d0
[   25.280849]  kasan_report+0x141/0x180
[   25.280870]  ? page_alloc_uaf+0x356/0x3d0
[   25.281054]  __asan_report_load1_noabort+0x18/0x20
[   25.281092]  page_alloc_uaf+0x356/0x3d0
[   25.281113]  ? __pfx_page_alloc_uaf+0x10/0x10
[   25.281134]  ? __schedule+0x10c6/0x2b60
[   25.281156]  ? __pfx_read_tsc+0x10/0x10
[   25.281177]  ? ktime_get_ts64+0x86/0x230
[   25.281203]  kunit_try_run_case+0x1a5/0x480
[   25.281226]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.281319]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   25.281344]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   25.281367]  ? __kthread_parkme+0x82/0x180
[   25.281391]  ? preempt_count_sub+0x50/0x80
[   25.281413]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.281437]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.281459]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   25.281482]  kthread+0x337/0x6f0
[   25.281500]  ? trace_preempt_on+0x20/0xc0
[   25.281523]  ? __pfx_kthread+0x10/0x10
[   25.281542]  ? _raw_spin_unlock_irq+0x47/0x80
[   25.281563]  ? calculate_sigpending+0x7b/0xa0
[   25.281586]  ? __pfx_kthread+0x10/0x10
[   25.281606]  ret_from_fork+0x116/0x1d0
[   25.281624]  ? __pfx_kthread+0x10/0x10
[   25.281643]  ret_from_fork_asm+0x1a/0x30
[   25.281674]  </TASK>
[   25.281684] 
[   25.289756] The buggy address belongs to the physical page:
[   25.290211] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1061c0
[   25.290823] flags: 0x200000000000000(node=0|zone=2)
[   25.290985] page_type: f0(buddy)
[   25.291140] raw: 0200000000000000 ffff88817fffc4f0 ffff88817fffc4f0 0000000000000000
[   25.292127] raw: 0000000000000000 0000000000000006 00000000f0000000 0000000000000000
[   25.292962] page dumped because: kasan: bad access detected
[   25.293569] 
[   25.293890] Memory state around the buggy address:
[   25.294315]  ffff8881061bff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   25.294908]  ffff8881061bff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   25.295707] >ffff8881061c0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   25.296213]                    ^
[   25.296607]  ffff8881061c0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   25.297123]  ffff8881061c0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   25.297793] ==================================================================
Metadata Full log Test run details