Date
July 19, 2025, 11:12 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.356577] ================================================================== [ 15.356724] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 15.356831] Read of size 1 at addr fff00000c5eb7c60 by task kunit_try_catch/192 [ 15.356947] [ 15.357093] CPU: 1 UID: 0 PID: 192 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT [ 15.357198] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.357246] Hardware name: linux,dummy-virt (DT) [ 15.357278] Call trace: [ 15.357303] show_stack+0x20/0x38 (C) [ 15.357506] dump_stack_lvl+0x8c/0xd0 [ 15.357602] print_report+0x118/0x5d0 [ 15.357683] kasan_report+0xdc/0x128 [ 15.357831] __kasan_check_byte+0x54/0x70 [ 15.357932] kfree_sensitive+0x30/0xb0 [ 15.358044] kmalloc_double_kzfree+0x168/0x308 [ 15.358143] kunit_try_run_case+0x170/0x3f0 [ 15.358209] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.358497] kthread+0x328/0x630 [ 15.358635] ret_from_fork+0x10/0x20 [ 15.358824] [ 15.358889] Allocated by task 192: [ 15.359008] kasan_save_stack+0x3c/0x68 [ 15.359093] kasan_save_track+0x20/0x40 [ 15.359240] kasan_save_alloc_info+0x40/0x58 [ 15.359355] __kasan_kmalloc+0xd4/0xd8 [ 15.359477] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.359516] kmalloc_double_kzfree+0xb8/0x308 [ 15.359609] kunit_try_run_case+0x170/0x3f0 [ 15.360043] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.360189] kthread+0x328/0x630 [ 15.360317] ret_from_fork+0x10/0x20 [ 15.360447] [ 15.360505] Freed by task 192: [ 15.360580] kasan_save_stack+0x3c/0x68 [ 15.360623] kasan_save_track+0x20/0x40 [ 15.360660] kasan_save_free_info+0x4c/0x78 [ 15.360710] __kasan_slab_free+0x6c/0x98 [ 15.361193] kfree+0x214/0x3c8 [ 15.361861] kfree_sensitive+0x80/0xb0 [ 15.361939] kmalloc_double_kzfree+0x11c/0x308 [ 15.362320] kunit_try_run_case+0x170/0x3f0 [ 15.362379] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.362455] kthread+0x328/0x630 [ 15.362489] ret_from_fork+0x10/0x20 [ 15.362957] [ 15.363014] The buggy address belongs to the object at fff00000c5eb7c60 [ 15.363014] which belongs to the cache kmalloc-16 of size 16 [ 15.363199] The buggy address is located 0 bytes inside of [ 15.363199] freed 16-byte region [fff00000c5eb7c60, fff00000c5eb7c70) [ 15.363273] [ 15.363305] The buggy address belongs to the physical page: [ 15.363337] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105eb7 [ 15.363413] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.363474] page_type: f5(slab) [ 15.363537] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 15.363599] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 15.363642] page dumped because: kasan: bad access detected [ 15.363673] [ 15.363723] Memory state around the buggy address: [ 15.363801] fff00000c5eb7b00: fa fb fc fc 00 01 fc fc 00 01 fc fc fa fb fc fc [ 15.363881] fff00000c5eb7b80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.364601] >fff00000c5eb7c00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.365260] ^ [ 15.365318] fff00000c5eb7c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.365388] fff00000c5eb7d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.365837] ==================================================================
[ 12.373204] ================================================================== [ 12.374402] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 12.374650] Read of size 1 at addr ffff888101df6d40 by task kunit_try_catch/209 [ 12.374873] [ 12.374964] CPU: 1 UID: 0 PID: 209 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT(voluntary) [ 12.375022] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.375034] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.375054] Call Trace: [ 12.375066] <TASK> [ 12.375081] dump_stack_lvl+0x73/0xb0 [ 12.375108] print_report+0xd1/0x610 [ 12.375129] ? __virt_addr_valid+0x1db/0x2d0 [ 12.375150] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.375172] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.375192] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.375214] kasan_report+0x141/0x180 [ 12.375234] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.375258] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.375280] __kasan_check_byte+0x3d/0x50 [ 12.375301] kfree_sensitive+0x22/0x90 [ 12.375322] kmalloc_double_kzfree+0x19c/0x350 [ 12.375344] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 12.375366] ? sysvec_apic_timer_interrupt+0x50/0x90 [ 12.375390] ? trace_hardirqs_on+0x37/0xe0 [ 12.375411] ? __pfx_read_tsc+0x10/0x10 [ 12.375431] ? ktime_get_ts64+0x86/0x230 [ 12.375454] kunit_try_run_case+0x1a5/0x480 [ 12.375478] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.375501] ? queued_spin_lock_slowpath+0x116/0xb40 [ 12.375525] ? __kthread_parkme+0x82/0x180 [ 12.375545] ? preempt_count_sub+0x50/0x80 [ 12.375567] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.375589] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.375611] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 12.375633] kthread+0x337/0x6f0 [ 12.375651] ? trace_preempt_on+0x20/0xc0 [ 12.375672] ? __pfx_kthread+0x10/0x10 [ 12.375691] ? _raw_spin_unlock_irq+0x47/0x80 [ 12.375711] ? calculate_sigpending+0x7b/0xa0 [ 12.375734] ? __pfx_kthread+0x10/0x10 [ 12.375754] ret_from_fork+0x116/0x1d0 [ 12.375771] ? __pfx_kthread+0x10/0x10 [ 12.375790] ret_from_fork_asm+0x1a/0x30 [ 12.375819] </TASK> [ 12.375829] [ 12.391128] Allocated by task 209: [ 12.391798] kasan_save_stack+0x45/0x70 [ 12.392170] kasan_save_track+0x18/0x40 [ 12.392562] kasan_save_alloc_info+0x3b/0x50 [ 12.393054] __kasan_kmalloc+0xb7/0xc0 [ 12.393398] __kmalloc_cache_noprof+0x189/0x420 [ 12.393580] kmalloc_double_kzfree+0xa9/0x350 [ 12.393736] kunit_try_run_case+0x1a5/0x480 [ 12.394270] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.394814] kthread+0x337/0x6f0 [ 12.395197] ret_from_fork+0x116/0x1d0 [ 12.395737] ret_from_fork_asm+0x1a/0x30 [ 12.396217] [ 12.396376] Freed by task 209: [ 12.396729] kasan_save_stack+0x45/0x70 [ 12.396887] kasan_save_track+0x18/0x40 [ 12.397040] kasan_save_free_info+0x3f/0x60 [ 12.397186] __kasan_slab_free+0x56/0x70 [ 12.397322] kfree+0x222/0x3f0 [ 12.397457] kfree_sensitive+0x67/0x90 [ 12.397590] kmalloc_double_kzfree+0x12b/0x350 [ 12.397769] kunit_try_run_case+0x1a5/0x480 [ 12.398229] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.398748] kthread+0x337/0x6f0 [ 12.399102] ret_from_fork+0x116/0x1d0 [ 12.399640] ret_from_fork_asm+0x1a/0x30 [ 12.400050] [ 12.400252] The buggy address belongs to the object at ffff888101df6d40 [ 12.400252] which belongs to the cache kmalloc-16 of size 16 [ 12.401334] The buggy address is located 0 bytes inside of [ 12.401334] freed 16-byte region [ffff888101df6d40, ffff888101df6d50) [ 12.402188] [ 12.402277] The buggy address belongs to the physical page: [ 12.402474] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101df6 [ 12.403266] flags: 0x200000000000000(node=0|zone=2) [ 12.403717] page_type: f5(slab) [ 12.403869] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 12.404110] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 12.404337] page dumped because: kasan: bad access detected [ 12.404616] [ 12.404740] Memory state around the buggy address: [ 12.405171] ffff888101df6c00: 00 02 fc fc 00 02 fc fc 00 02 fc fc fa fb fc fc [ 12.405936] ffff888101df6c80: fa fb fc fc fa fb fc fc 00 05 fc fc fa fb fc fc [ 12.406515] >ffff888101df6d00: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 12.407145] ^ [ 12.407317] ffff888101df6d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.408015] ffff888101df6e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.408756] ==================================================================