Date
July 20, 2025, 11:12 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 16.380337] ================================================================== [ 16.380449] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x388/0x468 [ 16.380727] Read of size 1 at addr fff00000c7017000 by task kunit_try_catch/213 [ 16.380882] [ 16.381010] CPU: 0 UID: 0 PID: 213 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT [ 16.381180] Tainted: [B]=BAD_PAGE, [N]=TEST [ 16.381316] Hardware name: linux,dummy-virt (DT) [ 16.381452] Call trace: [ 16.381507] show_stack+0x20/0x38 (C) [ 16.381559] dump_stack_lvl+0x8c/0xd0 [ 16.381614] print_report+0x118/0x5d0 [ 16.381744] kasan_report+0xdc/0x128 [ 16.381889] __asan_report_load1_noabort+0x20/0x30 [ 16.382134] kmem_cache_rcu_uaf+0x388/0x468 [ 16.382182] kunit_try_run_case+0x170/0x3f0 [ 16.382232] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.382283] kthread+0x328/0x630 [ 16.382327] ret_from_fork+0x10/0x20 [ 16.382376] [ 16.382394] Allocated by task 213: [ 16.382424] kasan_save_stack+0x3c/0x68 [ 16.382464] kasan_save_track+0x20/0x40 [ 16.382501] kasan_save_alloc_info+0x40/0x58 [ 16.382539] __kasan_slab_alloc+0xa8/0xb0 [ 16.382576] kmem_cache_alloc_noprof+0x10c/0x398 [ 16.382623] kmem_cache_rcu_uaf+0x12c/0x468 [ 16.382987] kunit_try_run_case+0x170/0x3f0 [ 16.383081] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.383321] kthread+0x328/0x630 [ 16.383366] ret_from_fork+0x10/0x20 [ 16.383442] [ 16.383464] Freed by task 0: [ 16.383939] kasan_save_stack+0x3c/0x68 [ 16.384272] kasan_save_track+0x20/0x40 [ 16.384318] kasan_save_free_info+0x4c/0x78 [ 16.384782] __kasan_slab_free+0x6c/0x98 [ 16.384828] slab_free_after_rcu_debug+0xd4/0x2f8 [ 16.384871] rcu_core+0x9f4/0x1e20 [ 16.384909] rcu_core_si+0x18/0x30 [ 16.384942] handle_softirqs+0x374/0xb28 [ 16.384980] __do_softirq+0x1c/0x28 [ 16.385013] [ 16.385033] Last potentially related work creation: [ 16.385061] kasan_save_stack+0x3c/0x68 [ 16.385098] kasan_record_aux_stack+0xb4/0xc8 [ 16.385138] kmem_cache_free+0x120/0x468 [ 16.385176] kmem_cache_rcu_uaf+0x16c/0x468 [ 16.385211] kunit_try_run_case+0x170/0x3f0 [ 16.385249] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.385291] kthread+0x328/0x630 [ 16.385322] ret_from_fork+0x10/0x20 [ 16.385371] [ 16.385390] The buggy address belongs to the object at fff00000c7017000 [ 16.385390] which belongs to the cache test_cache of size 200 [ 16.385450] The buggy address is located 0 bytes inside of [ 16.385450] freed 200-byte region [fff00000c7017000, fff00000c70170c8) [ 16.385762] [ 16.385788] The buggy address belongs to the physical page: [ 16.385823] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107017 [ 16.385883] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 16.386565] page_type: f5(slab) [ 16.386864] raw: 0bfffe0000000000 fff00000c700b280 dead000000000122 0000000000000000 [ 16.386917] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000 [ 16.386959] page dumped because: kasan: bad access detected [ 16.387398] [ 16.387452] Memory state around the buggy address: [ 16.387490] fff00000c7016f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 16.387599] fff00000c7016f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 16.387699] >fff00000c7017000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 16.387737] ^ [ 16.387767] fff00000c7017080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc [ 16.387810] fff00000c7017100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.388031] ==================================================================
[ 13.102661] ================================================================== [ 13.103208] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x3e3/0x510 [ 13.103599] Read of size 1 at addr ffff888102741000 by task kunit_try_catch/230 [ 13.104189] [ 13.104409] CPU: 1 UID: 0 PID: 230 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc6 #1 PREEMPT(voluntary) [ 13.104458] Tainted: [B]=BAD_PAGE, [N]=TEST [ 13.104470] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 13.104840] Call Trace: [ 13.104856] <TASK> [ 13.104873] dump_stack_lvl+0x73/0xb0 [ 13.104926] print_report+0xd1/0x610 [ 13.104948] ? __virt_addr_valid+0x1db/0x2d0 [ 13.104970] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 13.104992] ? kasan_complete_mode_report_info+0x64/0x200 [ 13.105014] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 13.105037] kasan_report+0x141/0x180 [ 13.105058] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 13.105084] __asan_report_load1_noabort+0x18/0x20 [ 13.105107] kmem_cache_rcu_uaf+0x3e3/0x510 [ 13.105130] ? __pfx_kmem_cache_rcu_uaf+0x10/0x10 [ 13.105151] ? finish_task_switch.isra.0+0x153/0x700 [ 13.105173] ? __switch_to+0x47/0xf50 [ 13.105202] ? __pfx_read_tsc+0x10/0x10 [ 13.105222] ? ktime_get_ts64+0x86/0x230 [ 13.105246] kunit_try_run_case+0x1a5/0x480 [ 13.105271] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.105292] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 13.105316] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 13.105338] ? __kthread_parkme+0x82/0x180 [ 13.105370] ? preempt_count_sub+0x50/0x80 [ 13.105391] ? __pfx_kunit_try_run_case+0x10/0x10 [ 13.105414] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.105446] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 13.105468] kthread+0x337/0x6f0 [ 13.105486] ? trace_preempt_on+0x20/0xc0 [ 13.105511] ? __pfx_kthread+0x10/0x10 [ 13.105531] ? _raw_spin_unlock_irq+0x47/0x80 [ 13.105552] ? calculate_sigpending+0x7b/0xa0 [ 13.105576] ? __pfx_kthread+0x10/0x10 [ 13.105595] ret_from_fork+0x116/0x1d0 [ 13.105614] ? __pfx_kthread+0x10/0x10 [ 13.105633] ret_from_fork_asm+0x1a/0x30 [ 13.105663] </TASK> [ 13.105673] [ 13.115952] Allocated by task 230: [ 13.116145] kasan_save_stack+0x45/0x70 [ 13.116552] kasan_save_track+0x18/0x40 [ 13.116876] kasan_save_alloc_info+0x3b/0x50 [ 13.117190] __kasan_slab_alloc+0x91/0xa0 [ 13.117373] kmem_cache_alloc_noprof+0x123/0x3f0 [ 13.117862] kmem_cache_rcu_uaf+0x155/0x510 [ 13.118082] kunit_try_run_case+0x1a5/0x480 [ 13.118276] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.118843] kthread+0x337/0x6f0 [ 13.119013] ret_from_fork+0x116/0x1d0 [ 13.119191] ret_from_fork_asm+0x1a/0x30 [ 13.119548] [ 13.119653] Freed by task 0: [ 13.119771] kasan_save_stack+0x45/0x70 [ 13.120223] kasan_save_track+0x18/0x40 [ 13.120509] kasan_save_free_info+0x3f/0x60 [ 13.120889] __kasan_slab_free+0x56/0x70 [ 13.121112] slab_free_after_rcu_debug+0xe4/0x310 [ 13.121523] rcu_core+0x66f/0x1c40 [ 13.121708] rcu_core_si+0x12/0x20 [ 13.121861] handle_softirqs+0x209/0x730 [ 13.122048] __irq_exit_rcu+0xc9/0x110 [ 13.122226] irq_exit_rcu+0x12/0x20 [ 13.122666] sysvec_apic_timer_interrupt+0x81/0x90 [ 13.122852] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 13.123306] [ 13.123395] Last potentially related work creation: [ 13.123801] kasan_save_stack+0x45/0x70 [ 13.124156] kasan_record_aux_stack+0xb2/0xc0 [ 13.124331] kmem_cache_free+0x131/0x420 [ 13.124605] kmem_cache_rcu_uaf+0x194/0x510 [ 13.125061] kunit_try_run_case+0x1a5/0x480 [ 13.125258] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 13.125681] kthread+0x337/0x6f0 [ 13.125862] ret_from_fork+0x116/0x1d0 [ 13.126163] ret_from_fork_asm+0x1a/0x30 [ 13.126321] [ 13.126757] The buggy address belongs to the object at ffff888102741000 [ 13.126757] which belongs to the cache test_cache of size 200 [ 13.127255] The buggy address is located 0 bytes inside of [ 13.127255] freed 200-byte region [ffff888102741000, ffff8881027410c8) [ 13.128126] [ 13.128235] The buggy address belongs to the physical page: [ 13.128674] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102741 [ 13.129203] flags: 0x200000000000000(node=0|zone=2) [ 13.129613] page_type: f5(slab) [ 13.129784] raw: 0200000000000000 ffff88810100d640 dead000000000122 0000000000000000 [ 13.130227] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000 [ 13.130649] page dumped because: kasan: bad access detected [ 13.131134] [ 13.131214] Memory state around the buggy address: [ 13.131771] ffff888102740f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.132134] ffff888102740f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.132679] >ffff888102741000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 13.133188] ^ [ 13.133419] ffff888102741080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc [ 13.133882] ffff888102741100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.134264] ==================================================================