Date
July 23, 2025, 3:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.219395] ================================================================== [ 31.219482] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 31.219562] Read of size 1 at addr fff00000c8603ee0 by task kunit_try_catch/225 [ 31.219888] [ 31.219965] CPU: 0 UID: 0 PID: 225 Comm: kunit_try_catch Tainted: G B W N 6.16.0-rc7-next-20250723 #1 PREEMPT [ 31.220065] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST [ 31.220140] Hardware name: linux,dummy-virt (DT) [ 31.220175] Call trace: [ 31.220202] show_stack+0x20/0x38 (C) [ 31.220258] dump_stack_lvl+0x8c/0xd0 [ 31.220628] print_report+0x118/0x5e8 [ 31.220710] kasan_report+0xdc/0x128 [ 31.220871] __kasan_check_byte+0x54/0x70 [ 31.221019] kfree_sensitive+0x30/0xb0 [ 31.221082] kmalloc_double_kzfree+0x168/0x308 [ 31.221313] kunit_try_run_case+0x170/0x3f0 [ 31.221568] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.221678] kthread+0x328/0x630 [ 31.221811] ret_from_fork+0x10/0x20 [ 31.221957] [ 31.222101] Allocated by task 225: [ 31.222152] kasan_save_stack+0x3c/0x68 [ 31.222387] kasan_save_track+0x20/0x40 [ 31.222592] kasan_save_alloc_info+0x40/0x58 [ 31.222668] __kasan_kmalloc+0xd4/0xd8 [ 31.222719] __kmalloc_cache_noprof+0x16c/0x3c0 [ 31.222877] kmalloc_double_kzfree+0xb8/0x308 [ 31.222972] kunit_try_run_case+0x170/0x3f0 [ 31.223190] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.223408] kthread+0x328/0x630 [ 31.223476] ret_from_fork+0x10/0x20 [ 31.223620] [ 31.223671] Freed by task 225: [ 31.223803] kasan_save_stack+0x3c/0x68 [ 31.223915] kasan_save_track+0x20/0x40 [ 31.223975] kasan_save_free_info+0x4c/0x78 [ 31.224360] __kasan_slab_free+0x6c/0x98 [ 31.224429] kfree+0x214/0x3c8 [ 31.224469] kfree_sensitive+0x80/0xb0 [ 31.224519] kmalloc_double_kzfree+0x11c/0x308 [ 31.225385] kunit_try_run_case+0x170/0x3f0 [ 31.225442] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.225487] kthread+0x328/0x630 [ 31.225554] ret_from_fork+0x10/0x20 [ 31.225606] [ 31.225651] The buggy address belongs to the object at fff00000c8603ee0 [ 31.225651] which belongs to the cache kmalloc-16 of size 16 [ 31.225733] The buggy address is located 0 bytes inside of [ 31.225733] freed 16-byte region [fff00000c8603ee0, fff00000c8603ef0) [ 31.226120] [ 31.226166] The buggy address belongs to the physical page: [ 31.226474] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xfff00000c8603e00 pfn:0x108603 [ 31.226750] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.226830] page_type: f5(slab) [ 31.227038] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 31.227266] raw: fff00000c8603e00 000000008080007f 00000000f5000000 0000000000000000 [ 31.227351] page dumped because: kasan: bad access detected [ 31.227452] [ 31.227474] Memory state around the buggy address: [ 31.227696] fff00000c8603d80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 31.227884] fff00000c8603e00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 31.228106] >fff00000c8603e80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 31.228294] ^ [ 31.228393] fff00000c8603f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.228504] fff00000c8603f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.228583] ==================================================================
[ 25.533017] ================================================================== [ 25.534559] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 25.535594] Read of size 1 at addr ffff8881046316c0 by task kunit_try_catch/241 [ 25.536239] [ 25.536343] CPU: 1 UID: 0 PID: 241 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7-next-20250723 #1 PREEMPT(voluntary) [ 25.536396] Tainted: [B]=BAD_PAGE, [N]=TEST [ 25.536410] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 25.536433] Call Trace: [ 25.536447] <TASK> [ 25.536467] dump_stack_lvl+0x73/0xb0 [ 25.536499] print_report+0xd1/0x640 [ 25.536524] ? __virt_addr_valid+0x1db/0x2d0 [ 25.536551] ? kmalloc_double_kzfree+0x19c/0x350 [ 25.536833] ? kasan_complete_mode_report_info+0x64/0x200 [ 25.536968] ? kmalloc_double_kzfree+0x19c/0x350 [ 25.536994] kasan_report+0x141/0x180 [ 25.537016] ? kmalloc_double_kzfree+0x19c/0x350 [ 25.537042] ? kmalloc_double_kzfree+0x19c/0x350 [ 25.537064] __kasan_check_byte+0x3d/0x50 [ 25.537085] kfree_sensitive+0x22/0x90 [ 25.537110] kmalloc_double_kzfree+0x19c/0x350 [ 25.537133] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 25.537168] ? __schedule+0x10da/0x2b60 [ 25.537194] ? __pfx_read_tsc+0x10/0x10 [ 25.537216] ? ktime_get_ts64+0x86/0x230 [ 25.537241] kunit_try_run_case+0x1a5/0x480 [ 25.537267] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.537289] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 25.537313] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 25.537338] ? __kthread_parkme+0x82/0x180 [ 25.537371] ? preempt_count_sub+0x50/0x80 [ 25.537396] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.537419] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.537442] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 25.537465] kthread+0x337/0x6f0 [ 25.537484] ? trace_preempt_on+0x20/0xc0 [ 25.537509] ? __pfx_kthread+0x10/0x10 [ 25.537529] ? _raw_spin_unlock_irq+0x47/0x80 [ 25.537552] ? calculate_sigpending+0x7b/0xa0 [ 25.537576] ? __pfx_kthread+0x10/0x10 [ 25.537597] ret_from_fork+0x116/0x1d0 [ 25.537616] ? __pfx_kthread+0x10/0x10 [ 25.537636] ret_from_fork_asm+0x1a/0x30 [ 25.537667] </TASK> [ 25.537678] [ 25.549776] Allocated by task 241: [ 25.549938] kasan_save_stack+0x45/0x70 [ 25.550295] kasan_save_track+0x18/0x40 [ 25.550622] kasan_save_alloc_info+0x3b/0x50 [ 25.551030] __kasan_kmalloc+0xb7/0xc0 [ 25.551731] __kmalloc_cache_noprof+0x189/0x420 [ 25.552135] kmalloc_double_kzfree+0xa9/0x350 [ 25.552349] kunit_try_run_case+0x1a5/0x480 [ 25.552765] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.553013] kthread+0x337/0x6f0 [ 25.553132] ret_from_fork+0x116/0x1d0 [ 25.553271] ret_from_fork_asm+0x1a/0x30 [ 25.553407] [ 25.553472] Freed by task 241: [ 25.553578] kasan_save_stack+0x45/0x70 [ 25.554098] kasan_save_track+0x18/0x40 [ 25.554262] kasan_save_free_info+0x3f/0x60 [ 25.554398] __kasan_slab_free+0x56/0x70 [ 25.554571] kfree+0x222/0x3f0 [ 25.554738] kfree_sensitive+0x67/0x90 [ 25.554924] kmalloc_double_kzfree+0x12b/0x350 [ 25.555162] kunit_try_run_case+0x1a5/0x480 [ 25.555337] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.555501] kthread+0x337/0x6f0 [ 25.555615] ret_from_fork+0x116/0x1d0 [ 25.555751] ret_from_fork_asm+0x1a/0x30 [ 25.555881] [ 25.555952] The buggy address belongs to the object at ffff8881046316c0 [ 25.555952] which belongs to the cache kmalloc-16 of size 16 [ 25.556878] The buggy address is located 0 bytes inside of [ 25.556878] freed 16-byte region [ffff8881046316c0, ffff8881046316d0) [ 25.558293] [ 25.558396] The buggy address belongs to the physical page: [ 25.558591] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x104631 [ 25.558830] flags: 0x200000000000000(node=0|zone=2) [ 25.558989] page_type: f5(slab) [ 25.559112] raw: 0200000000000000 ffff888100041640 dead000000000100 dead000000000122 [ 25.560393] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 25.561246] page dumped because: kasan: bad access detected [ 25.561785] [ 25.561950] Memory state around the buggy address: [ 25.562787] ffff888104631580: 00 06 fc fc 00 06 fc fc fa fb fc fc fa fb fc fc [ 25.563530] ffff888104631600: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 25.564301] >ffff888104631680: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 25.565272] ^ [ 25.566314] ffff888104631700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.566537] ffff888104631780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.567084] ==================================================================