Date
July 24, 2025, 4:41 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 32.713735] ================================================================== [ 32.713849] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 32.714081] Read of size 1 at addr fff00000c8683500 by task kunit_try_catch/223 [ 32.714272] [ 32.714432] CPU: 0 UID: 0 PID: 223 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7-next-20250724 #1 PREEMPT [ 32.714614] Tainted: [B]=BAD_PAGE, [N]=TEST [ 32.714651] Hardware name: linux,dummy-virt (DT) [ 32.714685] Call trace: [ 32.714712] show_stack+0x20/0x38 (C) [ 32.714774] dump_stack_lvl+0x8c/0xd0 [ 32.715069] print_report+0x118/0x5e8 [ 32.715265] kasan_report+0xdc/0x128 [ 32.715346] __kasan_check_byte+0x54/0x70 [ 32.715516] kfree_sensitive+0x30/0xb0 [ 32.715586] kmalloc_double_kzfree+0x168/0x308 [ 32.715784] kunit_try_run_case+0x170/0x3f0 [ 32.716016] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 32.716135] kthread+0x328/0x630 [ 32.716194] ret_from_fork+0x10/0x20 [ 32.716307] [ 32.716532] Allocated by task 223: [ 32.716696] kasan_save_stack+0x3c/0x68 [ 32.716848] kasan_save_track+0x20/0x40 [ 32.716890] kasan_save_alloc_info+0x40/0x58 [ 32.716938] __kasan_kmalloc+0xd4/0xd8 [ 32.716979] __kmalloc_cache_noprof+0x16c/0x3c0 [ 32.717032] kmalloc_double_kzfree+0xb8/0x308 [ 32.717072] kunit_try_run_case+0x170/0x3f0 [ 32.717121] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 32.717165] kthread+0x328/0x630 [ 32.717205] ret_from_fork+0x10/0x20 [ 32.717253] [ 32.717281] Freed by task 223: [ 32.717317] kasan_save_stack+0x3c/0x68 [ 32.717353] kasan_save_track+0x20/0x40 [ 32.717395] kasan_save_free_info+0x4c/0x78 [ 32.717433] __kasan_slab_free+0x6c/0x98 [ 32.717471] kfree+0x214/0x3c8 [ 32.717509] kfree_sensitive+0x80/0xb0 [ 32.717547] kmalloc_double_kzfree+0x11c/0x308 [ 32.717588] kunit_try_run_case+0x170/0x3f0 [ 32.717625] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 32.717668] kthread+0x328/0x630 [ 32.717700] ret_from_fork+0x10/0x20 [ 32.717736] [ 32.718220] The buggy address belongs to the object at fff00000c8683500 [ 32.718220] which belongs to the cache kmalloc-16 of size 16 [ 32.718690] The buggy address is located 0 bytes inside of [ 32.718690] freed 16-byte region [fff00000c8683500, fff00000c8683510) [ 32.719010] [ 32.719070] The buggy address belongs to the physical page: [ 32.719197] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x108683 [ 32.719257] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 32.719464] page_type: f5(slab) [ 32.719684] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 32.719793] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 32.719938] page dumped because: kasan: bad access detected [ 32.720009] [ 32.720125] Memory state around the buggy address: [ 32.720202] fff00000c8683400: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 32.720307] fff00000c8683480: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 32.720352] >fff00000c8683500: fa fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.720794] ^ [ 32.720908] fff00000c8683580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.721027] fff00000c8683600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.721107] ==================================================================
[ 27.194659] ================================================================== [ 27.196328] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 27.197137] Read of size 1 at addr ffff888105424ae0 by task kunit_try_catch/240 [ 27.197993] [ 27.198185] CPU: 0 UID: 0 PID: 240 Comm: kunit_try_catch Tainted: G B W N 6.16.0-rc7-next-20250724 #1 PREEMPT(voluntary) [ 27.198264] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST [ 27.198277] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 27.198299] Call Trace: [ 27.198313] <TASK> [ 27.198333] dump_stack_lvl+0x73/0xb0 [ 27.198374] print_report+0xd1/0x640 [ 27.198399] ? __virt_addr_valid+0x1db/0x2d0 [ 27.198425] ? kmalloc_double_kzfree+0x19c/0x350 [ 27.198447] ? kasan_complete_mode_report_info+0x64/0x200 [ 27.198472] ? kmalloc_double_kzfree+0x19c/0x350 [ 27.198526] kasan_report+0x141/0x180 [ 27.198549] ? kmalloc_double_kzfree+0x19c/0x350 [ 27.198584] ? kmalloc_double_kzfree+0x19c/0x350 [ 27.198607] __kasan_check_byte+0x3d/0x50 [ 27.198629] kfree_sensitive+0x22/0x90 [ 27.198651] kmalloc_double_kzfree+0x19c/0x350 [ 27.198674] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 27.198699] ? __schedule+0x10da/0x2b60 [ 27.198724] ? __pfx_read_tsc+0x10/0x10 [ 27.198746] ? ktime_get_ts64+0x86/0x230 [ 27.198772] kunit_try_run_case+0x1a5/0x480 [ 27.198823] ? __pfx_kunit_try_run_case+0x10/0x10 [ 27.198845] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 27.198890] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 27.198915] ? __kthread_parkme+0x82/0x180 [ 27.198937] ? preempt_count_sub+0x50/0x80 [ 27.198971] ? __pfx_kunit_try_run_case+0x10/0x10 [ 27.198995] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 27.199018] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 27.199041] kthread+0x337/0x6f0 [ 27.199061] ? trace_preempt_on+0x20/0xc0 [ 27.199086] ? __pfx_kthread+0x10/0x10 [ 27.199106] ? _raw_spin_unlock_irq+0x47/0x80 [ 27.199128] ? calculate_sigpending+0x7b/0xa0 [ 27.199152] ? __pfx_kthread+0x10/0x10 [ 27.199173] ret_from_fork+0x116/0x1d0 [ 27.199192] ? __pfx_kthread+0x10/0x10 [ 27.199212] ret_from_fork_asm+0x1a/0x30 [ 27.199243] </TASK> [ 27.199259] [ 27.213063] Allocated by task 240: [ 27.213206] kasan_save_stack+0x45/0x70 [ 27.213353] kasan_save_track+0x18/0x40 [ 27.213480] kasan_save_alloc_info+0x3b/0x50 [ 27.213803] __kasan_kmalloc+0xb7/0xc0 [ 27.214363] __kmalloc_cache_noprof+0x189/0x420 [ 27.214534] kmalloc_double_kzfree+0xa9/0x350 [ 27.214696] kunit_try_run_case+0x1a5/0x480 [ 27.215352] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 27.216140] kthread+0x337/0x6f0 [ 27.216472] ret_from_fork+0x116/0x1d0 [ 27.216618] ret_from_fork_asm+0x1a/0x30 [ 27.216755] [ 27.216972] Freed by task 240: [ 27.217316] kasan_save_stack+0x45/0x70 [ 27.217712] kasan_save_track+0x18/0x40 [ 27.218217] kasan_save_free_info+0x3f/0x60 [ 27.218560] __kasan_slab_free+0x56/0x70 [ 27.218715] kfree+0x222/0x3f0 [ 27.218855] kfree_sensitive+0x67/0x90 [ 27.219365] kmalloc_double_kzfree+0x12b/0x350 [ 27.219837] kunit_try_run_case+0x1a5/0x480 [ 27.220269] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 27.220846] kthread+0x337/0x6f0 [ 27.221041] ret_from_fork+0x116/0x1d0 [ 27.221424] ret_from_fork_asm+0x1a/0x30 [ 27.221613] [ 27.221681] The buggy address belongs to the object at ffff888105424ae0 [ 27.221681] which belongs to the cache kmalloc-16 of size 16 [ 27.222927] The buggy address is located 0 bytes inside of [ 27.222927] freed 16-byte region [ffff888105424ae0, ffff888105424af0) [ 27.223656] [ 27.223846] The buggy address belongs to the physical page: [ 27.224522] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105424 [ 27.224964] flags: 0x200000000000000(node=0|zone=2) [ 27.225133] page_type: f5(slab) [ 27.225254] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000 [ 27.225478] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 27.225978] page dumped because: kasan: bad access detected [ 27.226560] [ 27.226717] Memory state around the buggy address: [ 27.227401] ffff888105424980: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 27.228079] ffff888105424a00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 27.228769] >ffff888105424a80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 27.229512] ^ [ 27.229993] ffff888105424b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.230470] ffff888105424b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.230688] ==================================================================