Date
July 25, 2025, 3:13 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 33.631318] ================================================================== [ 33.631411] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x388/0x468 [ 33.631493] Read of size 1 at addr fff00000c9adc000 by task kunit_try_catch/245 [ 33.631546] [ 33.631588] CPU: 1 UID: 0 PID: 245 Comm: kunit_try_catch Tainted: G B W N 6.16.0-rc7-next-20250725 #1 PREEMPT [ 33.631704] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST [ 33.631736] Hardware name: linux,dummy-virt (DT) [ 33.631769] Call trace: [ 33.631797] show_stack+0x20/0x38 (C) [ 33.631849] dump_stack_lvl+0x8c/0xd0 [ 33.631901] print_report+0x118/0x5e8 [ 33.631947] kasan_report+0xdc/0x128 [ 33.631992] __asan_report_load1_noabort+0x20/0x30 [ 33.632041] kmem_cache_rcu_uaf+0x388/0x468 [ 33.632088] kunit_try_run_case+0x170/0x3f0 [ 33.632138] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 33.632191] kthread+0x328/0x630 [ 33.632236] ret_from_fork+0x10/0x20 [ 33.632284] [ 33.632303] Allocated by task 245: [ 33.632334] kasan_save_stack+0x3c/0x68 [ 33.632375] kasan_save_track+0x20/0x40 [ 33.632409] kasan_save_alloc_info+0x40/0x58 [ 33.632447] __kasan_slab_alloc+0xa8/0xb0 [ 33.632481] kmem_cache_alloc_noprof+0x10c/0x398 [ 33.632523] kmem_cache_rcu_uaf+0x12c/0x468 [ 33.632562] kunit_try_run_case+0x170/0x3f0 [ 33.632599] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 33.632652] kthread+0x328/0x630 [ 33.632689] ret_from_fork+0x10/0x20 [ 33.632725] [ 33.632745] Freed by task 0: [ 33.632772] kasan_save_stack+0x3c/0x68 [ 33.632807] kasan_save_track+0x20/0x40 [ 33.632842] kasan_save_free_info+0x4c/0x78 [ 33.632879] __kasan_slab_free+0x7c/0xa8 [ 33.632914] slab_free_after_rcu_debug+0xd4/0x2f8 [ 33.632954] rcu_core+0x9f4/0x1e58 [ 33.632993] rcu_core_si+0x18/0x30 [ 33.633027] handle_softirqs+0x374/0xb28 [ 33.633065] __do_softirq+0x1c/0x28 [ 33.633100] [ 33.633118] Last potentially related work creation: [ 33.633146] kasan_save_stack+0x3c/0x68 [ 33.633182] kasan_record_aux_stack+0xb4/0xc8 [ 33.633221] kmem_cache_free+0x120/0x468 [ 33.633259] kmem_cache_rcu_uaf+0x16c/0x468 [ 33.633301] kunit_try_run_case+0x170/0x3f0 [ 33.633339] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 33.633381] kthread+0x328/0x630 [ 33.633412] ret_from_fork+0x10/0x20 [ 33.633448] [ 33.633469] The buggy address belongs to the object at fff00000c9adc000 [ 33.633469] which belongs to the cache test_cache of size 200 [ 33.633525] The buggy address is located 0 bytes inside of [ 33.633525] freed 200-byte region [fff00000c9adc000, fff00000c9adc0c8) [ 33.633584] [ 33.633607] The buggy address belongs to the physical page: [ 33.633657] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109adc [ 33.633713] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 33.633765] page_type: f5(slab) [ 33.633805] raw: 0bfffe0000000000 fff00000c56bcb40 dead000000000122 0000000000000000 [ 33.633856] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000 [ 33.633896] page dumped because: kasan: bad access detected [ 33.633928] [ 33.633945] Memory state around the buggy address: [ 33.633980] fff00000c9adbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 33.634024] fff00000c9adbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 33.634068] >fff00000c9adc000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.634107] ^ [ 33.634135] fff00000c9adc080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc [ 33.634177] fff00000c9adc100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 33.634216] ==================================================================
[ 26.587047] ================================================================== [ 26.587504] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x3e3/0x510 [ 26.587881] Read of size 1 at addr ffff88810581a000 by task kunit_try_catch/262 [ 26.588563] [ 26.588904] CPU: 0 UID: 0 PID: 262 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7-next-20250725 #1 PREEMPT(voluntary) [ 26.588978] Tainted: [B]=BAD_PAGE, [N]=TEST [ 26.588992] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 26.589017] Call Trace: [ 26.589033] <TASK> [ 26.589075] dump_stack_lvl+0x73/0xb0 [ 26.589234] print_report+0xd1/0x640 [ 26.589262] ? __virt_addr_valid+0x1db/0x2d0 [ 26.589291] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 26.589316] ? kasan_complete_mode_report_info+0x64/0x200 [ 26.589346] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 26.589371] kasan_report+0x141/0x180 [ 26.589395] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 26.589426] __asan_report_load1_noabort+0x18/0x20 [ 26.589453] kmem_cache_rcu_uaf+0x3e3/0x510 [ 26.589479] ? __pfx_kmem_cache_rcu_uaf+0x10/0x10 [ 26.589505] ? finish_task_switch.isra.0+0x153/0x700 [ 26.589531] ? __switch_to+0x47/0xf80 [ 26.589563] ? __pfx_read_tsc+0x10/0x10 [ 26.589587] ? ktime_get_ts64+0x86/0x230 [ 26.589616] kunit_try_run_case+0x1a5/0x480 [ 26.589644] ? __pfx_kunit_try_run_case+0x10/0x10 [ 26.589669] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 26.589696] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 26.589724] ? __kthread_parkme+0x82/0x180 [ 26.589747] ? preempt_count_sub+0x50/0x80 [ 26.589772] ? __pfx_kunit_try_run_case+0x10/0x10 [ 26.589814] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 26.589842] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 26.589870] kthread+0x337/0x6f0 [ 26.589892] ? trace_preempt_on+0x20/0xc0 [ 26.589918] ? __pfx_kthread+0x10/0x10 [ 26.589952] ? _raw_spin_unlock_irq+0x47/0x80 [ 26.589978] ? calculate_sigpending+0x7b/0xa0 [ 26.590005] ? __pfx_kthread+0x10/0x10 [ 26.590029] ret_from_fork+0x116/0x1d0 [ 26.590050] ? __pfx_kthread+0x10/0x10 [ 26.590083] ret_from_fork_asm+0x1a/0x30 [ 26.590117] </TASK> [ 26.590130] [ 26.600477] Allocated by task 262: [ 26.600968] kasan_save_stack+0x45/0x70 [ 26.601296] kasan_save_track+0x18/0x40 [ 26.601619] kasan_save_alloc_info+0x3b/0x50 [ 26.601976] __kasan_slab_alloc+0x91/0xa0 [ 26.602364] kmem_cache_alloc_noprof+0x123/0x3f0 [ 26.602597] kmem_cache_rcu_uaf+0x155/0x510 [ 26.602783] kunit_try_run_case+0x1a5/0x480 [ 26.603341] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 26.603562] kthread+0x337/0x6f0 [ 26.603941] ret_from_fork+0x116/0x1d0 [ 26.604182] ret_from_fork_asm+0x1a/0x30 [ 26.604499] [ 26.604600] Freed by task 0: [ 26.604969] kasan_save_stack+0x45/0x70 [ 26.605277] kasan_save_track+0x18/0x40 [ 26.605449] kasan_save_free_info+0x3f/0x60 [ 26.605968] __kasan_slab_free+0x5e/0x80 [ 26.606208] slab_free_after_rcu_debug+0xe4/0x310 [ 26.606430] rcu_core+0x66f/0x1c40 [ 26.606595] rcu_core_si+0x12/0x20 [ 26.606762] handle_softirqs+0x209/0x730 [ 26.607296] __irq_exit_rcu+0xc9/0x110 [ 26.607452] irq_exit_rcu+0x12/0x20 [ 26.607782] sysvec_apic_timer_interrupt+0x81/0x90 [ 26.608197] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 26.608459] [ 26.608540] Last potentially related work creation: [ 26.608751] kasan_save_stack+0x45/0x70 [ 26.609236] kasan_record_aux_stack+0xb2/0xc0 [ 26.609421] kmem_cache_free+0x131/0x420 [ 26.610173] kmem_cache_rcu_uaf+0x194/0x510 [ 26.610497] kunit_try_run_case+0x1a5/0x480 [ 26.610805] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 26.611253] kthread+0x337/0x6f0 [ 26.611460] ret_from_fork+0x116/0x1d0 [ 26.611740] ret_from_fork_asm+0x1a/0x30 [ 26.612017] [ 26.612198] The buggy address belongs to the object at ffff88810581a000 [ 26.612198] which belongs to the cache test_cache of size 200 [ 26.612728] The buggy address is located 0 bytes inside of [ 26.612728] freed 200-byte region [ffff88810581a000, ffff88810581a0c8) [ 26.613451] [ 26.613556] The buggy address belongs to the physical page: [ 26.614123] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10581a [ 26.614443] flags: 0x200000000000000(node=0|zone=2) [ 26.614677] page_type: f5(slab) [ 26.614824] raw: 0200000000000000 ffff8881016a5c80 dead000000000122 0000000000000000 [ 26.615614] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000 [ 26.616068] page dumped because: kasan: bad access detected [ 26.616344] [ 26.616422] Memory state around the buggy address: [ 26.616601] ffff888105819f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.616909] ffff888105819f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.617253] >ffff88810581a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.617519] ^ [ 26.617680] ffff88810581a080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc [ 26.617982] ffff88810581a100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.618340] ==================================================================