Date
July 19, 2025, 11:11 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.493386] ================================================================== [ 15.493448] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 15.493507] Read of size 1 at addr fff00000c5f9c4c0 by task kunit_try_catch/193 [ 15.493577] [ 15.493613] CPU: 1 UID: 0 PID: 193 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT [ 15.494581] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.494910] Hardware name: linux,dummy-virt (DT) [ 15.495141] Call trace: [ 15.497171] show_stack+0x20/0x38 (C) [ 15.497285] dump_stack_lvl+0x8c/0xd0 [ 15.497334] print_report+0x118/0x5d0 [ 15.497381] kasan_report+0xdc/0x128 [ 15.497427] __kasan_check_byte+0x54/0x70 [ 15.497474] kfree_sensitive+0x30/0xb0 [ 15.497525] kmalloc_double_kzfree+0x168/0x308 [ 15.497582] kunit_try_run_case+0x170/0x3f0 [ 15.498347] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.499003] kthread+0x328/0x630 [ 15.499046] ret_from_fork+0x10/0x20 [ 15.499433] [ 15.499453] Allocated by task 193: [ 15.499498] kasan_save_stack+0x3c/0x68 [ 15.499557] kasan_save_track+0x20/0x40 [ 15.499602] kasan_save_alloc_info+0x40/0x58 [ 15.499648] __kasan_kmalloc+0xd4/0xd8 [ 15.499685] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.499730] kmalloc_double_kzfree+0xb8/0x308 [ 15.501018] kunit_try_run_case+0x170/0x3f0 [ 15.501071] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.501416] kthread+0x328/0x630 [ 15.501596] ret_from_fork+0x10/0x20 [ 15.501644] [ 15.501673] Freed by task 193: [ 15.501701] kasan_save_stack+0x3c/0x68 [ 15.501741] kasan_save_track+0x20/0x40 [ 15.501776] kasan_save_free_info+0x4c/0x78 [ 15.501816] __kasan_slab_free+0x6c/0x98 [ 15.502183] kfree+0x214/0x3c8 [ 15.502251] kfree_sensitive+0x80/0xb0 [ 15.502295] kmalloc_double_kzfree+0x11c/0x308 [ 15.502345] kunit_try_run_case+0x170/0x3f0 [ 15.502382] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.502434] kthread+0x328/0x630 [ 15.502466] ret_from_fork+0x10/0x20 [ 15.502595] [ 15.502627] The buggy address belongs to the object at fff00000c5f9c4c0 [ 15.502627] which belongs to the cache kmalloc-16 of size 16 [ 15.502789] The buggy address is located 0 bytes inside of [ 15.502789] freed 16-byte region [fff00000c5f9c4c0, fff00000c5f9c4d0) [ 15.502850] [ 15.503101] The buggy address belongs to the physical page: [ 15.503297] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105f9c [ 15.503402] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.503569] page_type: f5(slab) [ 15.503611] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 15.503785] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 15.503834] page dumped because: kasan: bad access detected [ 15.504114] [ 15.504138] Memory state around the buggy address: [ 15.504173] fff00000c5f9c380: fa fb fc fc fa fb fc fc fa fb fc fc 00 04 fc fc [ 15.504216] fff00000c5f9c400: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 15.504259] >fff00000c5f9c480: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 15.505839] ^ [ 15.506009] fff00000c5f9c500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.506061] fff00000c5f9c580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.506100] ==================================================================
[ 12.414248] ================================================================== [ 12.414857] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 12.415199] Read of size 1 at addr ffff888101994600 by task kunit_try_catch/210 [ 12.415563] [ 12.415679] CPU: 1 UID: 0 PID: 210 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT(voluntary) [ 12.415726] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.415736] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.415757] Call Trace: [ 12.415770] <TASK> [ 12.415787] dump_stack_lvl+0x73/0xb0 [ 12.415816] print_report+0xd1/0x610 [ 12.415837] ? __virt_addr_valid+0x1db/0x2d0 [ 12.415860] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.415882] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.415904] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.415927] kasan_report+0x141/0x180 [ 12.415948] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.415973] ? kmalloc_double_kzfree+0x19c/0x350 [ 12.415996] __kasan_check_byte+0x3d/0x50 [ 12.416017] kfree_sensitive+0x22/0x90 [ 12.416039] kmalloc_double_kzfree+0x19c/0x350 [ 12.416061] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 12.416083] ? sysvec_apic_timer_interrupt+0x50/0x90 [ 12.416108] ? trace_hardirqs_on+0x37/0xe0 [ 12.416130] ? __pfx_read_tsc+0x10/0x10 [ 12.416151] ? ktime_get_ts64+0x86/0x230 [ 12.416174] kunit_try_run_case+0x1a5/0x480 [ 12.416199] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.416222] ? queued_spin_lock_slowpath+0x116/0xb40 [ 12.416246] ? __kthread_parkme+0x82/0x180 [ 12.416266] ? preempt_count_sub+0x50/0x80 [ 12.416290] ? __pfx_kunit_try_run_case+0x10/0x10 [ 12.416312] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.416336] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 12.416359] kthread+0x337/0x6f0 [ 12.416532] ? trace_preempt_on+0x20/0xc0 [ 12.416554] ? __pfx_kthread+0x10/0x10 [ 12.416574] ? _raw_spin_unlock_irq+0x47/0x80 [ 12.416595] ? calculate_sigpending+0x7b/0xa0 [ 12.416619] ? __pfx_kthread+0x10/0x10 [ 12.416639] ret_from_fork+0x116/0x1d0 [ 12.416658] ? __pfx_kthread+0x10/0x10 [ 12.416677] ret_from_fork_asm+0x1a/0x30 [ 12.416707] </TASK> [ 12.416717] [ 12.424728] Allocated by task 210: [ 12.424908] kasan_save_stack+0x45/0x70 [ 12.425149] kasan_save_track+0x18/0x40 [ 12.425321] kasan_save_alloc_info+0x3b/0x50 [ 12.425526] __kasan_kmalloc+0xb7/0xc0 [ 12.425694] __kmalloc_cache_noprof+0x189/0x420 [ 12.425885] kmalloc_double_kzfree+0xa9/0x350 [ 12.426035] kunit_try_run_case+0x1a5/0x480 [ 12.426179] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.426857] kthread+0x337/0x6f0 [ 12.427035] ret_from_fork+0x116/0x1d0 [ 12.427396] ret_from_fork_asm+0x1a/0x30 [ 12.427582] [ 12.427656] Freed by task 210: [ 12.427790] kasan_save_stack+0x45/0x70 [ 12.427966] kasan_save_track+0x18/0x40 [ 12.428219] kasan_save_free_info+0x3f/0x60 [ 12.428363] __kasan_slab_free+0x56/0x70 [ 12.428505] kfree+0x222/0x3f0 [ 12.428717] kfree_sensitive+0x67/0x90 [ 12.428904] kmalloc_double_kzfree+0x12b/0x350 [ 12.429193] kunit_try_run_case+0x1a5/0x480 [ 12.429429] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.429617] kthread+0x337/0x6f0 [ 12.429737] ret_from_fork+0x116/0x1d0 [ 12.429868] ret_from_fork_asm+0x1a/0x30 [ 12.430005] [ 12.430074] The buggy address belongs to the object at ffff888101994600 [ 12.430074] which belongs to the cache kmalloc-16 of size 16 [ 12.430664] The buggy address is located 0 bytes inside of [ 12.430664] freed 16-byte region [ffff888101994600, ffff888101994610) [ 12.431167] [ 12.431408] The buggy address belongs to the physical page: [ 12.431686] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101994 [ 12.432034] flags: 0x200000000000000(node=0|zone=2) [ 12.432260] page_type: f5(slab) [ 12.432381] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 12.432618] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 12.433326] page dumped because: kasan: bad access detected [ 12.433621] [ 12.433716] Memory state around the buggy address: [ 12.433944] ffff888101994500: 00 02 fc fc 00 02 fc fc 00 02 fc fc fa fb fc fc [ 12.434538] ffff888101994580: fa fb fc fc 00 05 fc fc fa fb fc fc fa fb fc fc [ 12.434910] >ffff888101994600: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.435246] ^ [ 12.435365] ffff888101994680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.435604] ffff888101994700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.435923] ==================================================================