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Date
July 23, 2025, 2:10 a.m.

Environment
qemu-arm64
qemu-x86_64 

[   15.176517] ==================================================================
[   15.176616] BUG: KASAN: use-after-free in page_alloc_uaf+0x328/0x350
[   15.176862] Read of size 1 at addr fff00000c77f0000 by task kunit_try_catch/154
[   15.176914] 
[   15.176946] CPU: 1 UID: 0 PID: 154 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc7 #1 PREEMPT 
[   15.177025] Tainted: [B]=BAD_PAGE, [N]=TEST
[   15.177051] Hardware name: linux,dummy-virt (DT)
[   15.177081] Call trace:
[   15.177102]  show_stack+0x20/0x38 (C)
[   15.177150]  dump_stack_lvl+0x8c/0xd0
[   15.177299]  print_report+0x118/0x5d0
[   15.177449]  kasan_report+0xdc/0x128
[   15.177932]  __asan_report_load1_noabort+0x20/0x30
[   15.178011]  page_alloc_uaf+0x328/0x350
[   15.178057]  kunit_try_run_case+0x170/0x3f0
[   15.178457]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   15.178518]  kthread+0x328/0x630
[   15.178567]  ret_from_fork+0x10/0x20
[   15.179033] 
[   15.179145] The buggy address belongs to the physical page:
[   15.179185] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1077f0
[   15.179284] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   15.179530] page_type: f0(buddy)
[   15.179701] raw: 0bfffe0000000000 fff00000ff6160a0 fff00000ff6160a0 0000000000000000
[   15.179878] raw: 0000000000000000 0000000000000004 00000000f0000000 0000000000000000
[   15.179921] page dumped because: kasan: bad access detected
[   15.179952] 
[   15.179970] Memory state around the buggy address:
[   15.180004]  fff00000c77eff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   15.180047]  fff00000c77eff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   15.180090] >fff00000c77f0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   15.180130]                    ^
[   15.180158]  fff00000c77f0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   15.180200]  fff00000c77f0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   15.180237] ==================================================================
Metadata Full log Test run details 

[   12.258788] ==================================================================
[   12.259408] BUG: KASAN: use-after-free in page_alloc_uaf+0x356/0x3d0
[   12.259874] Read of size 1 at addr ffff888103a00000 by task kunit_try_catch/171
[   12.260143] 
[   12.260256] CPU: 1 UID: 0 PID: 171 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc7 #1 PREEMPT(voluntary) 
[   12.260299] Tainted: [B]=BAD_PAGE, [N]=TEST
[   12.260311] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   12.260331] Call Trace:
[   12.260343]  <TASK>
[   12.260358]  dump_stack_lvl+0x73/0xb0
[   12.260387]  print_report+0xd1/0x610
[   12.260408]  ? __virt_addr_valid+0x1db/0x2d0
[   12.260430]  ? page_alloc_uaf+0x356/0x3d0
[   12.260451]  ? kasan_addr_to_slab+0x11/0xa0
[   12.260471]  ? page_alloc_uaf+0x356/0x3d0
[   12.260492]  kasan_report+0x141/0x180
[   12.260513]  ? page_alloc_uaf+0x356/0x3d0
[   12.260539]  __asan_report_load1_noabort+0x18/0x20
[   12.260562]  page_alloc_uaf+0x356/0x3d0
[   12.260583]  ? __pfx_page_alloc_uaf+0x10/0x10
[   12.260605]  ? __schedule+0x10c6/0x2b60
[   12.260627]  ? __pfx_read_tsc+0x10/0x10
[   12.260647]  ? ktime_get_ts64+0x86/0x230
[   12.260670]  kunit_try_run_case+0x1a5/0x480
[   12.260695]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.260717]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   12.260740]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   12.260762]  ? __kthread_parkme+0x82/0x180
[   12.260782]  ? preempt_count_sub+0x50/0x80
[   12.260805]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.260842]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.260865]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   12.260888]  kthread+0x337/0x6f0
[   12.260907]  ? trace_preempt_on+0x20/0xc0
[   12.260929]  ? __pfx_kthread+0x10/0x10
[   12.260949]  ? _raw_spin_unlock_irq+0x47/0x80
[   12.260969]  ? calculate_sigpending+0x7b/0xa0
[   12.260992]  ? __pfx_kthread+0x10/0x10
[   12.261013]  ret_from_fork+0x116/0x1d0
[   12.261031]  ? __pfx_kthread+0x10/0x10
[   12.261051]  ret_from_fork_asm+0x1a/0x30
[   12.261080]  </TASK>
[   12.261090] 
[   12.268483] The buggy address belongs to the physical page:
[   12.268706] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103a00
[   12.268979] flags: 0x200000000000000(node=0|zone=2)
[   12.269301] page_type: f0(buddy)
[   12.269483] raw: 0200000000000000 ffff88817fffc5c8 ffff88817fffc5c8 0000000000000000
[   12.269831] raw: 0000000000000000 0000000000000009 00000000f0000000 0000000000000000
[   12.270175] page dumped because: kasan: bad access detected
[   12.270536] 
[   12.270612] Memory state around the buggy address:
[   12.270837]  ffff8881039fff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   12.271277]  ffff8881039fff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   12.271551] >ffff888103a00000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.271882]                    ^
[   12.272033]  ffff888103a00080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.272429]  ffff888103a00100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.272703] ==================================================================
Metadata Full log Test run details