Date
July 4, 2025, 11:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 29.693138] ================================================================== [ 29.693252] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308 [ 29.693325] Read of size 1 at addr fff00000c5a48a40 by task kunit_try_catch/225 [ 29.693419] [ 29.693511] CPU: 0 UID: 0 PID: 225 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4-next-20250704 #1 PREEMPT [ 29.693599] Tainted: [B]=BAD_PAGE, [N]=TEST [ 29.693624] Hardware name: linux,dummy-virt (DT) [ 29.693751] Call trace: [ 29.693805] show_stack+0x20/0x38 (C) [ 29.693858] dump_stack_lvl+0x8c/0xd0 [ 29.693925] print_report+0x118/0x608 [ 29.694001] kasan_report+0xdc/0x128 [ 29.694240] __kasan_check_byte+0x54/0x70 [ 29.694298] kfree_sensitive+0x30/0xb0 [ 29.694371] kmalloc_double_kzfree+0x168/0x308 [ 29.694422] kunit_try_run_case+0x170/0x3f0 [ 29.694482] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.694538] kthread+0x328/0x630 [ 29.694590] ret_from_fork+0x10/0x20 [ 29.694638] [ 29.694671] Allocated by task 225: [ 29.694701] kasan_save_stack+0x3c/0x68 [ 29.694742] kasan_save_track+0x20/0x40 [ 29.694780] kasan_save_alloc_info+0x40/0x58 [ 29.694828] __kasan_kmalloc+0xd4/0xd8 [ 29.694887] __kmalloc_cache_noprof+0x16c/0x3c0 [ 29.694950] kmalloc_double_kzfree+0xb8/0x308 [ 29.694999] kunit_try_run_case+0x170/0x3f0 [ 29.695040] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.695109] kthread+0x328/0x630 [ 29.695144] ret_from_fork+0x10/0x20 [ 29.695190] [ 29.695221] Freed by task 225: [ 29.695248] kasan_save_stack+0x3c/0x68 [ 29.695298] kasan_save_track+0x20/0x40 [ 29.695348] kasan_save_free_info+0x4c/0x78 [ 29.695384] __kasan_slab_free+0x6c/0x98 [ 29.695422] kfree+0x214/0x3c8 [ 29.695466] kfree_sensitive+0x80/0xb0 [ 29.695503] kmalloc_double_kzfree+0x11c/0x308 [ 29.695559] kunit_try_run_case+0x170/0x3f0 [ 29.695599] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.695650] kthread+0x328/0x630 [ 29.695683] ret_from_fork+0x10/0x20 [ 29.695719] [ 29.695739] The buggy address belongs to the object at fff00000c5a48a40 [ 29.695739] which belongs to the cache kmalloc-16 of size 16 [ 29.695796] The buggy address is located 0 bytes inside of [ 29.695796] freed 16-byte region [fff00000c5a48a40, fff00000c5a48a50) [ 29.695857] [ 29.696171] The buggy address belongs to the physical page: [ 29.696261] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105a48 [ 29.696360] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 29.696790] page_type: f5(slab) [ 29.696840] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 [ 29.697214] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 29.697283] page dumped because: kasan: bad access detected [ 29.697378] [ 29.697441] Memory state around the buggy address: [ 29.697508] fff00000c5a48900: fa fb fc fc fa fb fc fc fa fb fc fc 00 04 fc fc [ 29.697576] fff00000c5a48980: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 29.697651] >fff00000c5a48a00: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 29.697690] ^ [ 29.697753] fff00000c5a48a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 29.697796] fff00000c5a48b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 29.698040] ==================================================================
[ 25.271047] ================================================================== [ 25.271871] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350 [ 25.272592] Read of size 1 at addr ffff88810527f2c0 by task kunit_try_catch/241 [ 25.272881] [ 25.273001] CPU: 1 UID: 0 PID: 241 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc4-next-20250704 #1 PREEMPT(voluntary) [ 25.273053] Tainted: [B]=BAD_PAGE, [N]=TEST [ 25.273066] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 25.273091] Call Trace: [ 25.273104] <TASK> [ 25.273123] dump_stack_lvl+0x73/0xb0 [ 25.273154] print_report+0xd1/0x650 [ 25.273177] ? __virt_addr_valid+0x1db/0x2d0 [ 25.273201] ? kmalloc_double_kzfree+0x19c/0x350 [ 25.273223] ? kasan_complete_mode_report_info+0x64/0x200 [ 25.273261] ? kmalloc_double_kzfree+0x19c/0x350 [ 25.273285] kasan_report+0x141/0x180 [ 25.273307] ? kmalloc_double_kzfree+0x19c/0x350 [ 25.273332] ? kmalloc_double_kzfree+0x19c/0x350 [ 25.273355] __kasan_check_byte+0x3d/0x50 [ 25.273376] kfree_sensitive+0x22/0x90 [ 25.273416] kmalloc_double_kzfree+0x19c/0x350 [ 25.273439] ? __pfx_kmalloc_double_kzfree+0x10/0x10 [ 25.273462] ? __schedule+0x10cc/0x2b60 [ 25.273488] ? __pfx_read_tsc+0x10/0x10 [ 25.273510] ? ktime_get_ts64+0x86/0x230 [ 25.273536] kunit_try_run_case+0x1a5/0x480 [ 25.273562] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.273585] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 25.273609] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 25.273634] ? __kthread_parkme+0x82/0x180 [ 25.273654] ? preempt_count_sub+0x50/0x80 [ 25.273678] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.273703] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.273728] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 25.273752] kthread+0x337/0x6f0 [ 25.273772] ? trace_preempt_on+0x20/0xc0 [ 25.273796] ? __pfx_kthread+0x10/0x10 [ 25.273817] ? _raw_spin_unlock_irq+0x47/0x80 [ 25.273840] ? calculate_sigpending+0x7b/0xa0 [ 25.273864] ? __pfx_kthread+0x10/0x10 [ 25.273929] ret_from_fork+0x116/0x1d0 [ 25.273954] ? __pfx_kthread+0x10/0x10 [ 25.273975] ret_from_fork_asm+0x1a/0x30 [ 25.274008] </TASK> [ 25.274022] [ 25.281966] Allocated by task 241: [ 25.282155] kasan_save_stack+0x45/0x70 [ 25.282412] kasan_save_track+0x18/0x40 [ 25.282598] kasan_save_alloc_info+0x3b/0x50 [ 25.282784] __kasan_kmalloc+0xb7/0xc0 [ 25.282978] __kmalloc_cache_noprof+0x189/0x420 [ 25.283156] kmalloc_double_kzfree+0xa9/0x350 [ 25.283382] kunit_try_run_case+0x1a5/0x480 [ 25.283791] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.284091] kthread+0x337/0x6f0 [ 25.284300] ret_from_fork+0x116/0x1d0 [ 25.284446] ret_from_fork_asm+0x1a/0x30 [ 25.284586] [ 25.284654] Freed by task 241: [ 25.284765] kasan_save_stack+0x45/0x70 [ 25.284955] kasan_save_track+0x18/0x40 [ 25.285146] kasan_save_free_info+0x3f/0x60 [ 25.285402] __kasan_slab_free+0x56/0x70 [ 25.285738] kfree+0x222/0x3f0 [ 25.285967] kfree_sensitive+0x67/0x90 [ 25.286157] kmalloc_double_kzfree+0x12b/0x350 [ 25.286311] kunit_try_run_case+0x1a5/0x480 [ 25.286471] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.286649] kthread+0x337/0x6f0 [ 25.286871] ret_from_fork+0x116/0x1d0 [ 25.287070] ret_from_fork_asm+0x1a/0x30 [ 25.287272] [ 25.287370] The buggy address belongs to the object at ffff88810527f2c0 [ 25.287370] which belongs to the cache kmalloc-16 of size 16 [ 25.288193] The buggy address is located 0 bytes inside of [ 25.288193] freed 16-byte region [ffff88810527f2c0, ffff88810527f2d0) [ 25.288832] [ 25.288955] The buggy address belongs to the physical page: [ 25.289137] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10527f [ 25.289382] flags: 0x200000000000000(node=0|zone=2) [ 25.289880] page_type: f5(slab) [ 25.290079] raw: 0200000000000000 ffff888100041640 dead000000000100 dead000000000122 [ 25.290443] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 [ 25.290800] page dumped because: kasan: bad access detected [ 25.291131] [ 25.291228] Memory state around the buggy address: [ 25.291425] ffff88810527f180: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 25.291663] ffff88810527f200: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc [ 25.292597] >ffff88810527f280: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc [ 25.292843] ^ [ 25.293038] ffff88810527f300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.293376] ffff88810527f380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.293611] ==================================================================