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Date
July 12, 2025, 11:09 a.m.

Environment
qemu-arm64
qemu-x86_64 

[   18.951446] ==================================================================
[   18.951727] BUG: KASAN: use-after-free in kmalloc_large_uaf+0x2cc/0x2f8
[   18.952030] Read of size 1 at addr fff00000c66a4000 by task kunit_try_catch/149
[   18.952427] 
[   18.952617] CPU: 0 UID: 0 PID: 149 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT 
[   18.953731] Tainted: [B]=BAD_PAGE, [N]=TEST
[   18.953837] Hardware name: linux,dummy-virt (DT)
[   18.953948] Call trace:
[   18.954028]  show_stack+0x20/0x38 (C)
[   18.954402]  dump_stack_lvl+0x8c/0xd0
[   18.954510]  print_report+0x118/0x608
[   18.954624]  kasan_report+0xdc/0x128
[   18.954764]  __asan_report_load1_noabort+0x20/0x30
[   18.954901]  kmalloc_large_uaf+0x2cc/0x2f8
[   18.955087]  kunit_try_run_case+0x170/0x3f0
[   18.955393]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   18.955597]  kthread+0x328/0x630
[   18.955977]  ret_from_fork+0x10/0x20
[   18.956112] 
[   18.956171] The buggy address belongs to the physical page:
[   18.956249] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1066a4
[   18.956378] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   18.956542] raw: 0bfffe0000000000 ffffc1ffc31e4008 fff00000da456c40 0000000000000000
[   18.956708] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[   18.956809] page dumped because: kasan: bad access detected
[   18.956897] 
[   18.956943] Memory state around the buggy address:
[   18.957020]  fff00000c66a3f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   18.957123]  fff00000c66a3f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   18.957262] >fff00000c66a4000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   18.957392]                    ^
[   18.957514]  fff00000c66a4080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   18.957666]  fff00000c66a4100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   18.957757] ==================================================================
Metadata Full log Test run details 

[   12.170966] ==================================================================
[   12.171443] BUG: KASAN: use-after-free in kmalloc_large_uaf+0x2f1/0x340
[   12.171774] Read of size 1 at addr ffff888102bb4000 by task kunit_try_catch/166
[   12.172092] 
[   12.172179] CPU: 0 UID: 0 PID: 166 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc5 #1 PREEMPT(voluntary) 
[   12.172218] Tainted: [B]=BAD_PAGE, [N]=TEST
[   12.172229] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   12.172248] Call Trace:
[   12.172259]  <TASK>
[   12.172272]  dump_stack_lvl+0x73/0xb0
[   12.172298]  print_report+0xd1/0x650
[   12.172320]  ? __virt_addr_valid+0x1db/0x2d0
[   12.172342]  ? kmalloc_large_uaf+0x2f1/0x340
[   12.172361]  ? kasan_addr_to_slab+0x11/0xa0
[   12.172380]  ? kmalloc_large_uaf+0x2f1/0x340
[   12.172400]  kasan_report+0x141/0x180
[   12.172421]  ? kmalloc_large_uaf+0x2f1/0x340
[   12.172446]  __asan_report_load1_noabort+0x18/0x20
[   12.172469]  kmalloc_large_uaf+0x2f1/0x340
[   12.172489]  ? __pfx_kmalloc_large_uaf+0x10/0x10
[   12.172509]  ? __schedule+0x10cc/0x2b60
[   12.172530]  ? __pfx_read_tsc+0x10/0x10
[   12.172550]  ? ktime_get_ts64+0x86/0x230
[   12.172573]  kunit_try_run_case+0x1a5/0x480
[   12.172596]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.172617]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   12.172639]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   12.172661]  ? __kthread_parkme+0x82/0x180
[   12.172681]  ? preempt_count_sub+0x50/0x80
[   12.172704]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.172727]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.172928]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   12.172961]  kthread+0x337/0x6f0
[   12.172981]  ? trace_preempt_on+0x20/0xc0
[   12.173006]  ? __pfx_kthread+0x10/0x10
[   12.173027]  ? _raw_spin_unlock_irq+0x47/0x80
[   12.173048]  ? calculate_sigpending+0x7b/0xa0
[   12.173072]  ? __pfx_kthread+0x10/0x10
[   12.173094]  ret_from_fork+0x116/0x1d0
[   12.173112]  ? __pfx_kthread+0x10/0x10
[   12.173132]  ret_from_fork_asm+0x1a/0x30
[   12.173162]  </TASK>
[   12.173173] 
[   12.180332] The buggy address belongs to the physical page:
[   12.180595] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102bb4
[   12.181025] flags: 0x200000000000000(node=0|zone=2)
[   12.181264] raw: 0200000000000000 ffffea00040aee08 ffff88815b039f80 0000000000000000
[   12.181501] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[   12.181918] page dumped because: kasan: bad access detected
[   12.182172] 
[   12.182268] Memory state around the buggy address:
[   12.182467]  ffff888102bb3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   12.182975]  ffff888102bb3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   12.183259] >ffff888102bb4000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.183534]                    ^
[   12.183777]  ffff888102bb4080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.184071]  ffff888102bb4100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   12.184357] ==================================================================
Metadata Full log Test run details