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Date
July 16, 2025, 3:10 p.m.

Environment
qemu-arm64
qemu-x86_64 

[   16.472680] ==================================================================
[   16.472752] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   16.473003] Read of size 1 at addr fff00000c78c0000 by task kunit_try_catch/154
[   16.473386] 
[   16.473516] CPU: 1 UID: 0 PID: 154 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6 #1 PREEMPT 
[   16.473603] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.473629] Hardware name: linux,dummy-virt (DT)
[   16.473659] Call trace:
[   16.473680]  show_stack+0x20/0x38 (C)
[   16.473753]  dump_stack_lvl+0x8c/0xd0
[   16.473801]  print_report+0x118/0x5d0
[   16.474313]  kasan_report+0xdc/0x128
[   16.474563]  __asan_report_load1_noabort+0x20/0x30
[   16.474617]  page_alloc_uaf+0x328/0x350
[   16.474662]  kunit_try_run_case+0x170/0x3f0
[   16.474720]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   16.474773]  kthread+0x328/0x630
[   16.474814]  ret_from_fork+0x10/0x20
[   16.474861] 
[   16.474888] The buggy address belongs to the physical page:
[   16.475048] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1078c0
[   16.475104] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   16.475158] page_type: f0(buddy)
[   16.475272] raw: 0bfffe0000000000 fff00000ff616170 fff00000ff616170 0000000000000000
[   16.475322] raw: 0000000000000000 0000000000000006 00000000f0000000 0000000000000000
[   16.475361] page dumped because: kasan: bad access detected
[   16.475391] 
[   16.475408] Memory state around the buggy address:
[   16.475439]  fff00000c78bff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.475608]  fff00000c78bff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.475852] >fff00000c78c0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.476477]                    ^
[   16.476528]  fff00000c78c0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.476572]  fff00000c78c0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   16.476610] ==================================================================
Metadata Full log Test run details 

[   12.134783] ==================================================================
[   12.135482] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   12.135773] Read of size 1 at addr ffff888103900000 by task kunit_try_catch/171
[   12.136062] 
[   12.136238] CPU: 1 UID: 0 PID: 171 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6 #1 PREEMPT(voluntary) 
[   12.136283] Tainted: [B]=BAD_PAGE, [N]=TEST
[   12.136295] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   12.136315] Call Trace:
[   12.136327]  <TASK>
[   12.136342]  dump_stack_lvl+0x73/0xb0
[   12.136372]  print_report+0xd1/0x610
[   12.136394]  ? __virt_addr_valid+0x1db/0x2d0
[   12.136417]  ? page_alloc_uaf+0x356/0x3d0
[   12.136446]  ? kasan_addr_to_slab+0x11/0xa0
[   12.136467]  ? page_alloc_uaf+0x356/0x3d0
[   12.136489]  kasan_report+0x141/0x180
[   12.136511]  ? page_alloc_uaf+0x356/0x3d0
[   12.136537]  __asan_report_load1_noabort+0x18/0x20
[   12.136562]  page_alloc_uaf+0x356/0x3d0
[   12.136584]  ? __pfx_page_alloc_uaf+0x10/0x10
[   12.136607]  ? __schedule+0x10cc/0x2b60
[   12.136630]  ? __pfx_read_tsc+0x10/0x10
[   12.136651]  ? ktime_get_ts64+0x86/0x230
[   12.136675]  kunit_try_run_case+0x1a5/0x480
[   12.136699]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.136723]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   12.136746]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   12.136782]  ? __kthread_parkme+0x82/0x180
[   12.136803]  ? preempt_count_sub+0x50/0x80
[   12.136827]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.136852]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.136876]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   12.136902]  kthread+0x337/0x6f0
[   12.136920]  ? trace_preempt_on+0x20/0xc0
[   12.136944]  ? __pfx_kthread+0x10/0x10
[   12.136965]  ? _raw_spin_unlock_irq+0x47/0x80
[   12.136986]  ? calculate_sigpending+0x7b/0xa0
[   12.137010]  ? __pfx_kthread+0x10/0x10
[   12.137042]  ret_from_fork+0x116/0x1d0
[   12.137061]  ? __pfx_kthread+0x10/0x10
[   12.137081]  ret_from_fork_asm+0x1a/0x30
[   12.137112]  </TASK>
[   12.137122] 
[   12.144988] The buggy address belongs to the physical page:
[   12.145243] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103900
[   12.145561] flags: 0x200000000000000(node=0|zone=2)
[   12.145880] page_type: f0(buddy)
[   12.146194] raw: 0200000000000000 ffff88817fffc580 ffff88817fffc580 0000000000000000
[   12.146591] raw: 0000000000000000 0000000000000008 00000000f0000000 0000000000000000
[   12.146883] page dumped because: kasan: bad access detected
[   12.147056] 
[   12.147150] Memory state around the buggy address:
[   12.147480]  ffff8881038fff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.147767]  ffff8881038fff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.148259] >ffff888103900000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.148609]                    ^
[   12.148784]  ffff888103900080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.149171]  ffff888103900100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.149420] ==================================================================
Metadata Full log Test run details