Date
July 8, 2025, 11:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.328572] ================================================================== [ 31.328668] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 31.328785] Read of size 1 at addr fff00000c79816c0 by task kunit_try_catch/223 [ 31.328870] [ 31.328910] CPU: 0 UID: 0 PID: 223 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5-next-20250708 #1 PREEMPT [ 31.329152] Tainted: [B]=BAD_PAGE, [N]=TEST [ 31.329183] Hardware name: linux,dummy-virt (DT) [ 31.329229] Call trace: [ 31.329414] show_stack+0x20/0x38 (C) [ 31.329553] dump_stack_lvl+0x8c/0xd0 [ 31.329605] print_report+0x118/0x5d0 [ 31.329652] kasan_report+0xdc/0x128 [ 31.329743] __kasan_check_byte+0x54/0x70 [ 31.329915] kfree_sensitive+0x30/0xb0 [ 31.329965] kmalloc_double_kzfree+0x168/0x308 [ 31.330425] kunit_try_run_case+0x170/0x3f0 [ 31.330591] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.331111] kthread+0x328/0x630 [ 31.331726] ret_from_fork+0x10/0x20 [ 31.332237] [ 31.332605] Allocated by task 223: [ 31.332757] kasan_save_stack+0x3c/0x68 [ 31.332854] kasan_save_track+0x20/0x40 [ 31.332918] kasan_save_alloc_info+0x40/0x58 [ 31.332982] __kasan_kmalloc+0xd4/0xd8 [ 31.333022] __kmalloc_cache_noprof+0x16c/0x3c0 [ 31.333071] kmalloc_double_kzfree+0xb8/0x308 [ 31.333236] kunit_try_run_case+0x170/0x3f0 [ 31.333508] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.333554] kthread+0x328/0x630 [ 31.333588] ret_from_fork+0x10/0x20 [ 31.333625] [ 31.333647] Freed by task 223: [ 31.333676] kasan_save_stack+0x3c/0x68 [ 31.334799] kasan_save_track+0x20/0x40 [ 31.335384] kasan_save_free_info+0x4c/0x78 [ 31.335831] __kasan_slab_free+0x6c/0x98 [ 31.336315] kfree+0x214/0x3c8 [ 31.336464] kfree_sensitive+0x80/0xb0 [ 31.336504] kmalloc_double_kzfree+0x11c/0x308 [ 31.336949] kunit_try_run_case+0x170/0x3f0 [ 31.337016] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.337615] kthread+0x328/0x630 [ 31.338009] ret_from_fork+0x10/0x20 [ 31.338478] [ 31.338519] The buggy address belongs to the object at fff00000c79816c0 [ 31.338519] which belongs to the cache kmalloc-16 of size 16 [ 31.338811] The buggy address is located 0 bytes inside of [ 31.338811] freed 16-byte region [fff00000c79816c0, fff00000c79816d0) [ 31.338879] [ 31.338902] The buggy address belongs to the physical page: [ 31.339356] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107981 [ 31.340109] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.340905] page_type: f5(slab) [ 31.340962] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 31.341015] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 31.341056] page dumped because: kasan: bad access detected [ 31.341090] [ 31.341110] Memory state around the buggy address: [ 31.341144] fff00000c7981580: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 31.341188] fff00000c7981600: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 31.341245] >fff00000c7981680: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 31.341286] ^ [ 31.341321] fff00000c7981700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.341366] fff00000c7981780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.341405] ==================================================================
[ 23.682363] ================================================================== [ 23.682938] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 23.683467] Read of size 1 at addr ffff8881025fe600 by task kunit_try_catch/240 [ 23.683790] [ 23.683944] CPU: 1 UID: 0 PID: 240 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5-next-20250708 #1 PREEMPT(voluntary) [ 23.683998] Tainted: [B]=BAD_PAGE, [N]=TEST [ 23.684011] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 23.684034] Call Trace: [ 23.684048] <TASK> [ 23.684068] dump_stack_lvl+0x73/0xb0 [ 23.684101] print_report+0xd1/0x610 [ 23.684125] ? __virt_addr_valid+0x1db/0x2d0 [ 23.684152] ? kmalloc_double_kzfree+0x19c/0x350 [ 23.684176] ? kasan_complete_mode_report_info+0x64/0x200 [ 23.684205] ? kmalloc_double_kzfree+0x19c/0x350 [ 23.684229] kasan_report+0x141/0x180 [ 23.684265] ? kmalloc_double_kzfree+0x19c/0x350 [ 23.684292] ? kmalloc_double_kzfree+0x19c/0x350 [ 23.684316] __kasan_check_byte+0x3d/0x50 [ 23.684338] kfree_sensitive+0x22/0x90 [ 23.684369] kmalloc_double_kzfree+0x19c/0x350 [ 23.684393] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 23.684442] ? __schedule+0x10cc/0x2b60 [ 23.684473] ? __pfx_read_tsc+0x10/0x10 [ 23.684499] ? ktime_get_ts64+0x86/0x230 [ 23.684538] kunit_try_run_case+0x1a5/0x480 [ 23.684563] ? __pfx_kunit_try_run_case+0x10/0x10 [ 23.684596] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 23.684618] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 23.684647] ? __kthread_parkme+0x82/0x180 [ 23.684669] ? preempt_count_sub+0x50/0x80 [ 23.684694] ? __pfx_kunit_try_run_case+0x10/0x10 [ 23.684716] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 23.684743] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 23.684771] kthread+0x337/0x6f0 [ 23.684793] ? trace_preempt_on+0x20/0xc0 [ 23.684881] ? __pfx_kthread+0x10/0x10 [ 23.684905] ? _raw_spin_unlock_irq+0x47/0x80 [ 23.684932] ? calculate_sigpending+0x7b/0xa0 [ 23.684961] ? __pfx_kthread+0x10/0x10 [ 23.684984] ret_from_fork+0x116/0x1d0 [ 23.685005] ? __pfx_kthread+0x10/0x10 [ 23.685027] ret_from_fork_asm+0x1a/0x30 [ 23.685062] </TASK> [ 23.685074] [ 23.696135] Allocated by task 240: [ 23.696408] kasan_save_stack+0x45/0x70 [ 23.696586] kasan_save_track+0x18/0x40 [ 23.697292] kasan_save_alloc_info+0x3b/0x50 [ 23.697501] __kasan_kmalloc+0xb7/0xc0 [ 23.697664] __kmalloc_cache_noprof+0x189/0x420 [ 23.697963] kmalloc_double_kzfree+0xa9/0x350 [ 23.698182] kunit_try_run_case+0x1a5/0x480 [ 23.698394] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 23.698627] kthread+0x337/0x6f0 [ 23.698775] ret_from_fork+0x116/0x1d0 [ 23.699112] ret_from_fork_asm+0x1a/0x30 [ 23.699273] [ 23.699340] Freed by task 240: [ 23.699494] kasan_save_stack+0x45/0x70 [ 23.699680] kasan_save_track+0x18/0x40 [ 23.699909] kasan_save_free_info+0x3f/0x60 [ 23.700131] __kasan_slab_free+0x56/0x70 [ 23.700447] kfree+0x222/0x3f0 [ 23.700621] kfree_sensitive+0x67/0x90 [ 23.700914] kmalloc_double_kzfree+0x12b/0x350 [ 23.701064] kunit_try_run_case+0x1a5/0x480 [ 23.701206] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 23.701469] kthread+0x337/0x6f0 [ 23.701653] ret_from_fork+0x116/0x1d0 [ 23.701837] ret_from_fork_asm+0x1a/0x30 [ 23.702065] [ 23.702216] The buggy address belongs to the object at ffff8881025fe600 [ 23.702216] which belongs to the cache kmalloc-16 of size 16 [ 23.702728] The buggy address is located 0 bytes inside of [ 23.702728] freed 16-byte region [ffff8881025fe600, ffff8881025fe610) [ 23.703459] [ 23.703538] The buggy address belongs to the physical page: [ 23.703858] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1025fe [ 23.704321] flags: 0x200000000000000(node=0|zone=2) [ 23.704554] page_type: f5(slab) [ 23.704702] raw: 0200000000000000 ffff888100041640 dead000000000100 dead000000000122 [ 23.705069] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 23.705481] page dumped because: kasan: bad access detected [ 23.705738] [ 23.705868] Memory state around the buggy address: [ 23.706108] ffff8881025fe500: 00 00 fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 23.706446] ffff8881025fe580: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 23.706706] >ffff8881025fe600: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.707090] ^ [ 23.707436] ffff8881025fe680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.707727] ffff8881025fe700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 23.708195] ==================================================================