Hay
Date
July 5, 2025, 11:11 p.m.

Environment
qemu-x86_64

[   18.058589] ==================================================================
[   18.059346] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x32/0x90
[   18.060579] Write of size 121 at addr ffff888103929700 by task kunit_try_catch/303
[   18.061765] 
[   18.062139] CPU: 0 UID: 0 PID: 303 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   18.062210] Tainted: [B]=BAD_PAGE, [N]=TEST
[   18.062328] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   18.062360] Call Trace:
[   18.062380]  <TASK>
[   18.062410]  dump_stack_lvl+0x73/0xb0
[   18.062456]  print_report+0xd1/0x650
[   18.062487]  ? __virt_addr_valid+0x1db/0x2d0
[   18.062520]  ? _copy_from_user+0x32/0x90
[   18.062544]  ? kasan_complete_mode_report_info+0x2a/0x200
[   18.062572]  ? _copy_from_user+0x32/0x90
[   18.062596]  kasan_report+0x141/0x180
[   18.062623]  ? _copy_from_user+0x32/0x90
[   18.062651]  kasan_check_range+0x10c/0x1c0
[   18.062680]  __kasan_check_write+0x18/0x20
[   18.062704]  _copy_from_user+0x32/0x90
[   18.062730]  copy_user_test_oob+0x2be/0x10f0
[   18.062763]  ? __pfx_copy_user_test_oob+0x10/0x10
[   18.062802]  ? finish_task_switch.isra.0+0x153/0x700
[   18.062831]  ? __switch_to+0x47/0xf50
[   18.062864]  ? __schedule+0x10cc/0x2b60
[   18.062891]  ? __pfx_read_tsc+0x10/0x10
[   18.062918]  ? ktime_get_ts64+0x86/0x230
[   18.062949]  kunit_try_run_case+0x1a5/0x480
[   18.062978]  ? __pfx_kunit_try_run_case+0x10/0x10
[   18.063004]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   18.063034]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   18.063063]  ? __kthread_parkme+0x82/0x180
[   18.063102]  ? preempt_count_sub+0x50/0x80
[   18.063131]  ? __pfx_kunit_try_run_case+0x10/0x10
[   18.063161]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   18.063189]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   18.063219]  kthread+0x337/0x6f0
[   18.063244]  ? trace_preempt_on+0x20/0xc0
[   18.063274]  ? __pfx_kthread+0x10/0x10
[   18.063300]  ? _raw_spin_unlock_irq+0x47/0x80
[   18.063326]  ? calculate_sigpending+0x7b/0xa0
[   18.063357]  ? __pfx_kthread+0x10/0x10
[   18.063383]  ret_from_fork+0x116/0x1d0
[   18.063408]  ? __pfx_kthread+0x10/0x10
[   18.063433]  ret_from_fork_asm+0x1a/0x30
[   18.063471]  </TASK>
[   18.063489] 
[   18.075343] Allocated by task 303:
[   18.075647]  kasan_save_stack+0x45/0x70
[   18.076037]  kasan_save_track+0x18/0x40
[   18.076485]  kasan_save_alloc_info+0x3b/0x50
[   18.076883]  __kasan_kmalloc+0xb7/0xc0
[   18.077098]  __kmalloc_noprof+0x1c9/0x500
[   18.077320]  kunit_kmalloc_array+0x25/0x60
[   18.077551]  copy_user_test_oob+0xab/0x10f0
[   18.077776]  kunit_try_run_case+0x1a5/0x480
[   18.077963]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   18.078164]  kthread+0x337/0x6f0
[   18.078407]  ret_from_fork+0x116/0x1d0
[   18.078633]  ret_from_fork_asm+0x1a/0x30
[   18.078854] 
[   18.078966] The buggy address belongs to the object at ffff888103929700
[   18.078966]  which belongs to the cache kmalloc-128 of size 128
[   18.079485] The buggy address is located 0 bytes inside of
[   18.079485]  allocated 120-byte region [ffff888103929700, ffff888103929778)
[   18.080079] 
[   18.080389] The buggy address belongs to the physical page:
[   18.080676] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103929
[   18.081075] flags: 0x200000000000000(node=0|zone=2)
[   18.081944] page_type: f5(slab)
[   18.082296] raw: 0200000000000000 ffff888100041a00 dead000000000122 0000000000000000
[   18.082669] raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
[   18.083037] page dumped because: kasan: bad access detected
[   18.083621] 
[   18.083953] Memory state around the buggy address:
[   18.084476]  ffff888103929600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   18.084924]  ffff888103929680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.085508] >ffff888103929700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
[   18.086313]                                                                 ^
[   18.086666]  ffff888103929780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.087013]  ffff888103929800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.087703] ==================================================================