Date
July 12, 2025, 11:09 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 16.836771] ================================================================== [ 16.837024] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 16.837165] Read of size 1 at addr fff00000c45d1ae0 by task kunit_try_catch/192 [ 16.837229] [ 16.837261] CPU: 1 UID: 0 PID: 192 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5 #1 PREEMPT [ 16.837352] Tainted: [B]=BAD_PAGE, [N]=TEST [ 16.837380] Hardware name: linux,dummy-virt (DT) [ 16.837411] Call trace: [ 16.837557] show_stack+0x20/0x38 (C) [ 16.837609] dump_stack_lvl+0x8c/0xd0 [ 16.837654] print_report+0x118/0x5d0 [ 16.837698] kasan_report+0xdc/0x128 [ 16.837743] __kasan_check_byte+0x54/0x70 [ 16.837789] kfree_sensitive+0x30/0xb0 [ 16.838000] kmalloc_double_kzfree+0x168/0x308 [ 16.838061] kunit_try_run_case+0x170/0x3f0 [ 16.838108] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.838161] kthread+0x328/0x630 [ 16.838295] ret_from_fork+0x10/0x20 [ 16.838379] [ 16.838507] Allocated by task 192: [ 16.838542] kasan_save_stack+0x3c/0x68 [ 16.838587] kasan_save_track+0x20/0x40 [ 16.838625] kasan_save_alloc_info+0x40/0x58 [ 16.838740] __kasan_kmalloc+0xd4/0xd8 [ 16.838779] __kmalloc_cache_noprof+0x16c/0x3c0 [ 16.838819] kmalloc_double_kzfree+0xb8/0x308 [ 16.838858] kunit_try_run_case+0x170/0x3f0 [ 16.838905] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.838950] kthread+0x328/0x630 [ 16.838982] ret_from_fork+0x10/0x20 [ 16.839017] [ 16.839045] Freed by task 192: [ 16.839070] kasan_save_stack+0x3c/0x68 [ 16.839106] kasan_save_track+0x20/0x40 [ 16.839143] kasan_save_free_info+0x4c/0x78 [ 16.839195] __kasan_slab_free+0x6c/0x98 [ 16.839258] kfree+0x214/0x3c8 [ 16.839341] kfree_sensitive+0x80/0xb0 [ 16.839631] kmalloc_double_kzfree+0x11c/0x308 [ 16.839722] kunit_try_run_case+0x170/0x3f0 [ 16.839822] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.839944] kthread+0x328/0x630 [ 16.840015] ret_from_fork+0x10/0x20 [ 16.840113] [ 16.840206] The buggy address belongs to the object at fff00000c45d1ae0 [ 16.840206] which belongs to the cache kmalloc-16 of size 16 [ 16.840278] The buggy address is located 0 bytes inside of [ 16.840278] freed 16-byte region [fff00000c45d1ae0, fff00000c45d1af0) [ 16.840712] [ 16.840808] The buggy address belongs to the physical page: [ 16.840885] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1045d1 [ 16.840955] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 16.841004] page_type: f5(slab) [ 16.841210] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 16.841320] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 16.841447] page dumped because: kasan: bad access detected [ 16.841539] [ 16.841599] Memory state around the buggy address: [ 16.841692] fff00000c45d1980: fa fb fc fc 00 05 fc fc fa fb fc fc fa fb fc fc [ 16.841762] fff00000c45d1a00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 16.841815] >fff00000c45d1a80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 16.842111] ^ [ 16.842186] fff00000c45d1b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.842322] fff00000c45d1b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.842426] ==================================================================
[ 13.312072] ================================================================== [ 13.313556] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 13.314409] Read of size 1 at addr ffff888101c9b480 by task kunit_try_catch/209 [ 13.315100] [ 13.315328] CPU: 0 UID: 0 PID: 209 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc5 #1 PREEMPT(voluntary) [ 13.315376] Tainted: [B]=BAD_PAGE, [N]=TEST [ 13.315388] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 13.315409] Call Trace: [ 13.315422] <TASK> [ 13.315438] dump_stack_lvl+0x73/0xb0 [ 13.315470] print_report+0xd1/0x610 [ 13.315493] ? __virt_addr_valid+0x1db/0x2d0 [ 13.315516] ? kmalloc_double_kzfree+0x19c/0x350 [ 13.315539] ? kasan_complete_mode_report_info+0x64/0x200 [ 13.315562] ? kmalloc_double_kzfree+0x19c/0x350 [ 13.315586] kasan_report+0x141/0x180 [ 13.315607] ? kmalloc_double_kzfree+0x19c/0x350 [ 13.315633] ? kmalloc_double_kzfree+0x19c/0x350 [ 13.315657] __kasan_check_byte+0x3d/0x50 [ 13.315679] kfree_sensitive+0x22/0x90 [ 13.315702] kmalloc_double_kzfree+0x19c/0x350 [ 13.315725] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 13.315749] ? __schedule+0x10cc/0x2b60 [ 13.315772] ? __pfx_read_tsc+0x10/0x10 [ 13.315792] ? ktime_get_ts64+0x86/0x230 [ 13.315816] kunit_try_run_case+0x1a5/0x480 [ 13.315842] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.315865] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 13.315889] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 13.315913] ? __kthread_parkme+0x82/0x180 [ 13.315934] ? preempt_count_sub+0x50/0x80 [ 13.315958] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.315991] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.316016] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 13.316040] kthread+0x337/0x6f0 [ 13.316059] ? trace_preempt_on+0x20/0xc0 [ 13.316082] ? __pfx_kthread+0x10/0x10 [ 13.316102] ? _raw_spin_unlock_irq+0x47/0x80 [ 13.316124] ? calculate_sigpending+0x7b/0xa0 [ 13.316149] ? __pfx_kthread+0x10/0x10 [ 13.316170] ret_from_fork+0x116/0x1d0 [ 13.316188] ? __pfx_kthread+0x10/0x10 [ 13.316208] ret_from_fork_asm+0x1a/0x30 [ 13.316238] </TASK> [ 13.316248] [ 13.328886] Allocated by task 209: [ 13.329384] kasan_save_stack+0x45/0x70 [ 13.329760] kasan_save_track+0x18/0x40 [ 13.329901] kasan_save_alloc_info+0x3b/0x50 [ 13.330331] __kasan_kmalloc+0xb7/0xc0 [ 13.330691] __kmalloc_cache_noprof+0x189/0x420 [ 13.330913] kmalloc_double_kzfree+0xa9/0x350 [ 13.331072] kunit_try_run_case+0x1a5/0x480 [ 13.331221] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.331773] kthread+0x337/0x6f0 [ 13.332211] ret_from_fork+0x116/0x1d0 [ 13.332583] ret_from_fork_asm+0x1a/0x30 [ 13.332963] [ 13.333194] Freed by task 209: [ 13.333625] kasan_save_stack+0x45/0x70 [ 13.333980] kasan_save_track+0x18/0x40 [ 13.334299] kasan_save_free_info+0x3f/0x60 [ 13.334568] __kasan_slab_free+0x56/0x70 [ 13.334713] kfree+0x222/0x3f0 [ 13.334829] kfree_sensitive+0x67/0x90 [ 13.334962] kmalloc_double_kzfree+0x12b/0x350 [ 13.335650] kunit_try_run_case+0x1a5/0x480 [ 13.336098] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.336681] kthread+0x337/0x6f0 [ 13.337205] ret_from_fork+0x116/0x1d0 [ 13.337576] ret_from_fork_asm+0x1a/0x30 [ 13.337943] [ 13.338102] The buggy address belongs to the object at ffff888101c9b480 [ 13.338102] which belongs to the cache kmalloc-16 of size 16 [ 13.339074] The buggy address is located 0 bytes inside of [ 13.339074] freed 16-byte region [ffff888101c9b480, ffff888101c9b490) [ 13.339729] [ 13.339803] The buggy address belongs to the physical page: [ 13.339977] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101c9b [ 13.340838] flags: 0x200000000000000(node=0|zone=2) [ 13.341571] page_type: f5(slab) [ 13.341899] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 13.342638] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 13.343167] page dumped because: kasan: bad access detected [ 13.343384] [ 13.343617] Memory state around the buggy address: [ 13.344204] ffff888101c9b380: 00 02 fc fc 00 02 fc fc fa fb fc fc fa fb fc fc [ 13.344741] ffff888101c9b400: fa fb fc fc 00 05 fc fc fa fb fc fc fa fb fc fc [ 13.344964] >ffff888101c9b480: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.345740] ^ [ 13.346057] ffff888101c9b500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.346766] ffff888101c9b580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.347052] ==================================================================