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Date
July 3, 2025, 10:10 a.m.

Environment
dragonboard-845c
qemu-arm64
qemu-x86_64 

[   33.698497] ==================================================================
[   33.713747] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   33.720192] Read of size 1 at addr ffff0000934a0000 by task kunit_try_catch/263
[   33.727595] 
[   33.729130] CPU: 3 UID: 0 PID: 263 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4-next-20250703 #1 PREEMPT 
[   33.729159] Tainted: [B]=BAD_PAGE, [N]=TEST
[   33.729168] Hardware name: Thundercomm Dragonboard 845c (DT)
[   33.729179] Call trace:
[   33.729186]  show_stack+0x20/0x38 (C)
[   33.729204]  dump_stack_lvl+0x8c/0xd0
[   33.729224]  print_report+0x118/0x608
[   33.729245]  kasan_report+0xdc/0x128
[   33.729264]  __asan_report_load1_noabort+0x20/0x30
[   33.729282]  page_alloc_uaf+0x328/0x350
[   33.729299]  kunit_try_run_case+0x170/0x3f0
[   33.729317]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   33.729340]  kthread+0x328/0x630
[   33.729355]  ret_from_fork+0x10/0x20
[   33.729372] 
[   33.794725] The buggy address belongs to the physical page:
[   33.800370] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1134a0
[   33.808474] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   33.815089] page_type: f0(buddy)
[   33.818378] raw: 0bfffe0000000000 ffff0000fd587e48 ffff0000fd587e48 0000000000000000
[   33.826224] raw: 0000000000000000 0000000000000005 00000000f0000000 0000000000000000
[   33.834066] page dumped because: kasan: bad access detected
[   33.839711] 
[   33.841242] Memory state around the buggy address:
[   33.846100]  ffff00009349ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   33.853415]  ffff00009349ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   33.860729] >ffff0000934a0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   33.868041]                    ^
[   33.871325]  ffff0000934a0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   33.878639]  ffff0000934a0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   33.885952] ==================================================================
Metadata Full log Test run details 

[   30.815514] ==================================================================
[   30.815588] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   30.815657] Read of size 1 at addr fff00000c9be0000 by task kunit_try_catch/186
[   30.815706] 
[   30.815994] CPU: 0 UID: 0 PID: 186 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4-next-20250703 #1 PREEMPT 
[   30.816099] Tainted: [B]=BAD_PAGE, [N]=TEST
[   30.816125] Hardware name: linux,dummy-virt (DT)
[   30.816159] Call trace:
[   30.816528]  show_stack+0x20/0x38 (C)
[   30.816720]  dump_stack_lvl+0x8c/0xd0
[   30.816918]  print_report+0x118/0x608
[   30.817137]  kasan_report+0xdc/0x128
[   30.817184]  __asan_report_load1_noabort+0x20/0x30
[   30.817454]  page_alloc_uaf+0x328/0x350
[   30.817615]  kunit_try_run_case+0x170/0x3f0
[   30.817765]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   30.817841]  kthread+0x328/0x630
[   30.818203]  ret_from_fork+0x10/0x20
[   30.818269] 
[   30.818290] The buggy address belongs to the physical page:
[   30.818323] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109be0
[   30.818396] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   30.818447] page_type: f0(buddy)
[   30.818511] raw: 0bfffe0000000000 fff00000ff616148 fff00000ff616148 0000000000000000
[   30.818563] raw: 0000000000000000 0000000000000005 00000000f0000000 0000000000000000
[   30.818617] page dumped because: kasan: bad access detected
[   30.818647] 
[   30.818665] Memory state around the buggy address:
[   30.818699]  fff00000c9bdff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.818742]  fff00000c9bdff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.818784] >fff00000c9be0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.818821]                    ^
[   30.819379]  fff00000c9be0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.819454]  fff00000c9be0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   30.819534] ==================================================================
Metadata Full log Test run details 

[   22.712391] ==================================================================
[   22.712988] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   22.713247] Read of size 1 at addr ffff888106120000 by task kunit_try_catch/203
[   22.713547] 
[   22.713644] CPU: 1 UID: 0 PID: 203 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4-next-20250703 #1 PREEMPT(voluntary) 
[   22.713689] Tainted: [B]=BAD_PAGE, [N]=TEST
[   22.713701] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   22.713721] Call Trace:
[   22.713735]  <TASK>
[   22.713751]  dump_stack_lvl+0x73/0xb0
[   22.713778]  print_report+0xd1/0x650
[   22.713799]  ? __virt_addr_valid+0x1db/0x2d0
[   22.713821]  ? page_alloc_uaf+0x356/0x3d0
[   22.713849]  ? kasan_addr_to_slab+0x11/0xa0
[   22.713876]  ? page_alloc_uaf+0x356/0x3d0
[   22.713897]  kasan_report+0x141/0x180
[   22.713918]  ? page_alloc_uaf+0x356/0x3d0
[   22.713944]  __asan_report_load1_noabort+0x18/0x20
[   22.713967]  page_alloc_uaf+0x356/0x3d0
[   22.713988]  ? __pfx_page_alloc_uaf+0x10/0x10
[   22.714009]  ? __schedule+0x10cc/0x2b60
[   22.714036]  ? __pfx_read_tsc+0x10/0x10
[   22.714057]  ? ktime_get_ts64+0x86/0x230
[   22.714080]  kunit_try_run_case+0x1a5/0x480
[   22.714105]  ? __pfx_kunit_try_run_case+0x10/0x10
[   22.714128]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   22.714149]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   22.714176]  ? __kthread_parkme+0x82/0x180
[   22.714195]  ? preempt_count_sub+0x50/0x80
[   22.714217]  ? __pfx_kunit_try_run_case+0x10/0x10
[   22.714241]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   22.714264]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   22.714287]  kthread+0x337/0x6f0
[   22.714306]  ? trace_preempt_on+0x20/0xc0
[   22.714328]  ? __pfx_kthread+0x10/0x10
[   22.714349]  ? _raw_spin_unlock_irq+0x47/0x80
[   22.714374]  ? calculate_sigpending+0x7b/0xa0
[   22.714397]  ? __pfx_kthread+0x10/0x10
[   22.714420]  ret_from_fork+0x116/0x1d0
[   22.714438]  ? __pfx_kthread+0x10/0x10
[   22.714499]  ret_from_fork_asm+0x1a/0x30
[   22.714531]  </TASK>
[   22.714543] 
[   22.721378] The buggy address belongs to the physical page:
[   22.721640] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106120
[   22.721996] flags: 0x200000000000000(node=0|zone=2)
[   22.722434] page_type: f0(buddy)
[   22.722624] raw: 0200000000000000 ffff88817fffb4a8 ffff88817fffb4a8 0000000000000000
[   22.722869] raw: 0000000000000000 0000000000000005 00000000f0000000 0000000000000000
[   22.723121] page dumped because: kasan: bad access detected
[   22.723446] 
[   22.723545] Memory state around the buggy address:
[   22.723764]  ffff88810611ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.724073]  ffff88810611ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.724363] >ffff888106120000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.724658]                    ^
[   22.724814]  ffff888106120080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.725122]  ffff888106120100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   22.725507] ==================================================================
Metadata Full log Test run details