Hay
Date
July 17, 2025, 10:12 a.m.

Environment
qemu-arm64
qemu-x86_64

[   29.630304] ==================================================================
[   29.630406] BUG: KASAN: out-of-bounds in kmalloc_memmove_negative_size+0x154/0x2e0
[   29.630631] Read of size 18446744073709551614 at addr fff00000c9b1c484 by task kunit_try_catch/211
[   29.630730] 
[   29.630925] CPU: 1 UID: 0 PID: 211 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6-next-20250717 #1 PREEMPT 
[   29.631029] Tainted: [B]=BAD_PAGE, [N]=TEST
[   29.631128] Hardware name: linux,dummy-virt (DT)
[   29.631163] Call trace:
[   29.631193]  show_stack+0x20/0x38 (C)
[   29.631246]  dump_stack_lvl+0x8c/0xd0
[   29.631390]  print_report+0x118/0x5d0
[   29.631441]  kasan_report+0xdc/0x128
[   29.631484]  kasan_check_range+0x100/0x1a8
[   29.631538]  __asan_memmove+0x3c/0x98
[   29.631581]  kmalloc_memmove_negative_size+0x154/0x2e0
[   29.631634]  kunit_try_run_case+0x170/0x3f0
[   29.631941]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   29.632073]  kthread+0x328/0x630
[   29.632118]  ret_from_fork+0x10/0x20
[   29.632312] 
[   29.632405] Allocated by task 211:
[   29.632696]  kasan_save_stack+0x3c/0x68
[   29.632860]  kasan_save_track+0x20/0x40
[   29.632941]  kasan_save_alloc_info+0x40/0x58
[   29.633131]  __kasan_kmalloc+0xd4/0xd8
[   29.633242]  __kmalloc_cache_noprof+0x16c/0x3c0
[   29.633355]  kmalloc_memmove_negative_size+0xb0/0x2e0
[   29.633402]  kunit_try_run_case+0x170/0x3f0
[   29.633450]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   29.633783]  kthread+0x328/0x630
[   29.633963]  ret_from_fork+0x10/0x20
[   29.634048] 
[   29.634179] The buggy address belongs to the object at fff00000c9b1c480
[   29.634179]  which belongs to the cache kmalloc-64 of size 64
[   29.634415] The buggy address is located 4 bytes inside of
[   29.634415]  64-byte region [fff00000c9b1c480, fff00000c9b1c4c0)
[   29.634637] 
[   29.634716] The buggy address belongs to the physical page:
[   29.634857] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109b1c
[   29.634952] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   29.635094] page_type: f5(slab)
[   29.635211] raw: 0bfffe0000000000 fff00000c00018c0 dead000000000122 0000000000000000
[   29.635289] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000
[   29.635716] page dumped because: kasan: bad access detected
[   29.635788] 
[   29.635882] Memory state around the buggy address:
[   29.635973]  fff00000c9b1c380: 00 00 00 00 01 fc fc fc fc fc fc fc fc fc fc fc
[   29.636046]  fff00000c9b1c400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   29.636202] >fff00000c9b1c480: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
[   29.636268]                    ^
[   29.636410]  fff00000c9b1c500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   29.636595]  fff00000c9b1c580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   29.636675] ==================================================================

[   25.849854] ==================================================================
[   25.850326] BUG: KASAN: out-of-bounds in kmalloc_memmove_negative_size+0x171/0x330
[   25.850618] Read of size 18446744073709551614 at addr ffff888106086384 by task kunit_try_catch/229
[   25.851393] 
[   25.851510] CPU: 1 UID: 0 PID: 229 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc6-next-20250717 #1 PREEMPT(voluntary) 
[   25.851559] Tainted: [B]=BAD_PAGE, [N]=TEST
[   25.851570] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   25.851590] Call Trace:
[   25.851602]  <TASK>
[   25.851615]  dump_stack_lvl+0x73/0xb0
[   25.851645]  print_report+0xd1/0x610
[   25.851666]  ? __virt_addr_valid+0x1db/0x2d0
[   25.851688]  ? kmalloc_memmove_negative_size+0x171/0x330
[   25.851711]  ? kasan_complete_mode_report_info+0x2a/0x200
[   25.851737]  ? kmalloc_memmove_negative_size+0x171/0x330
[   25.851781]  kasan_report+0x141/0x180
[   25.851802]  ? kmalloc_memmove_negative_size+0x171/0x330
[   25.851831]  kasan_check_range+0x10c/0x1c0
[   25.851853]  __asan_memmove+0x27/0x70
[   25.851876]  kmalloc_memmove_negative_size+0x171/0x330
[   25.851899]  ? __pfx_kmalloc_memmove_negative_size+0x10/0x10
[   25.851923]  ? __schedule+0x10c6/0x2b60
[   25.851945]  ? __pfx_read_tsc+0x10/0x10
[   25.851965]  ? ktime_get_ts64+0x86/0x230
[   25.851988]  kunit_try_run_case+0x1a5/0x480
[   25.852011]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.852032]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   25.852053]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   25.852075]  ? __kthread_parkme+0x82/0x180
[   25.852114]  ? preempt_count_sub+0x50/0x80
[   25.852137]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.852159]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.852180]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   25.852202]  kthread+0x337/0x6f0
[   25.852220]  ? trace_preempt_on+0x20/0xc0
[   25.852244]  ? __pfx_kthread+0x10/0x10
[   25.852317]  ? _raw_spin_unlock_irq+0x47/0x80
[   25.852340]  ? calculate_sigpending+0x7b/0xa0
[   25.852362]  ? __pfx_kthread+0x10/0x10
[   25.852383]  ret_from_fork+0x116/0x1d0
[   25.852401]  ? __pfx_kthread+0x10/0x10
[   25.852421]  ret_from_fork_asm+0x1a/0x30
[   25.852452]  </TASK>
[   25.852463] 
[   25.859766] Allocated by task 229:
[   25.859988]  kasan_save_stack+0x45/0x70
[   25.860194]  kasan_save_track+0x18/0x40
[   25.860714]  kasan_save_alloc_info+0x3b/0x50
[   25.860884]  __kasan_kmalloc+0xb7/0xc0
[   25.861009]  __kmalloc_cache_noprof+0x189/0x420
[   25.861172]  kmalloc_memmove_negative_size+0xac/0x330
[   25.861634]  kunit_try_run_case+0x1a5/0x480
[   25.861833]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.862085]  kthread+0x337/0x6f0
[   25.862234]  ret_from_fork+0x116/0x1d0
[   25.862407]  ret_from_fork_asm+0x1a/0x30
[   25.862590] 
[   25.862677] The buggy address belongs to the object at ffff888106086380
[   25.862677]  which belongs to the cache kmalloc-64 of size 64
[   25.863146] The buggy address is located 4 bytes inside of
[   25.863146]  64-byte region [ffff888106086380, ffff8881060863c0)
[   25.863575] 
[   25.863670] The buggy address belongs to the physical page:
[   25.863904] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106086
[   25.864215] flags: 0x200000000000000(node=0|zone=2)
[   25.864502] page_type: f5(slab)
[   25.864670] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000
[   25.864944] raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000
[   25.865218] page dumped because: kasan: bad access detected
[   25.865580] 
[   25.865656] Memory state around the buggy address:
[   25.865890]  ffff888106086280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   25.866126]  ffff888106086300: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   25.866333] >ffff888106086380: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
[   25.866536]                    ^
[   25.866643]  ffff888106086400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.866946]  ffff888106086480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.867254] ==================================================================