Date
July 23, 2025, 3:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.885314] ================================================================== [ 31.885419] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x388/0x468 [ 31.885506] Read of size 1 at addr fff00000c9a5a000 by task kunit_try_catch/246 [ 31.885557] [ 31.885602] CPU: 0 UID: 0 PID: 246 Comm: kunit_try_catch Tainted: G B W N 6.16.0-rc7-next-20250723 #1 PREEMPT [ 31.885697] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST [ 31.885730] Hardware name: linux,dummy-virt (DT) [ 31.885765] Call trace: [ 31.885791] show_stack+0x20/0x38 (C) [ 31.885844] dump_stack_lvl+0x8c/0xd0 [ 31.885893] print_report+0x118/0x5e8 [ 31.885955] kasan_report+0xdc/0x128 [ 31.885998] __asan_report_load1_noabort+0x20/0x30 [ 31.886047] kmem_cache_rcu_uaf+0x388/0x468 [ 31.886095] kunit_try_run_case+0x170/0x3f0 [ 31.886146] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.886199] kthread+0x328/0x630 [ 31.886243] ret_from_fork+0x10/0x20 [ 31.886293] [ 31.886311] Allocated by task 246: [ 31.886342] kasan_save_stack+0x3c/0x68 [ 31.886400] kasan_save_track+0x20/0x40 [ 31.886436] kasan_save_alloc_info+0x40/0x58 [ 31.886473] __kasan_slab_alloc+0xa8/0xb0 [ 31.886509] kmem_cache_alloc_noprof+0x10c/0x398 [ 31.886555] kmem_cache_rcu_uaf+0x12c/0x468 [ 31.886594] kunit_try_run_case+0x170/0x3f0 [ 31.886631] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.886676] kthread+0x328/0x630 [ 31.886709] ret_from_fork+0x10/0x20 [ 31.886747] [ 31.886764] Freed by task 0: [ 31.886789] kasan_save_stack+0x3c/0x68 [ 31.886823] kasan_save_track+0x20/0x40 [ 31.886858] kasan_save_free_info+0x4c/0x78 [ 31.886894] __kasan_slab_free+0x6c/0x98 [ 31.886939] slab_free_after_rcu_debug+0xd4/0x2f8 [ 31.886981] rcu_core+0x9f4/0x1e58 [ 31.887019] rcu_core_si+0x18/0x30 [ 31.887054] handle_softirqs+0x374/0xb28 [ 31.887091] __do_softirq+0x1c/0x28 [ 31.887125] [ 31.887144] Last potentially related work creation: [ 31.887169] kasan_save_stack+0x3c/0x68 [ 31.887205] kasan_record_aux_stack+0xb4/0xc8 [ 31.887243] kmem_cache_free+0x120/0x468 [ 31.887282] kmem_cache_rcu_uaf+0x16c/0x468 [ 31.887320] kunit_try_run_case+0x170/0x3f0 [ 31.887359] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.887402] kthread+0x328/0x630 [ 31.887435] ret_from_fork+0x10/0x20 [ 31.887469] [ 31.887487] The buggy address belongs to the object at fff00000c9a5a000 [ 31.887487] which belongs to the cache test_cache of size 200 [ 31.887546] The buggy address is located 0 bytes inside of [ 31.887546] freed 200-byte region [fff00000c9a5a000, fff00000c9a5a0c8) [ 31.887607] [ 31.887629] The buggy address belongs to the physical page: [ 31.887669] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109a5a [ 31.887727] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.887777] page_type: f5(slab) [ 31.887819] raw: 0bfffe0000000000 fff00000c5c248c0 dead000000000122 0000000000000000 [ 31.887868] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000 [ 31.887917] page dumped because: kasan: bad access detected [ 31.887948] [ 31.887965] Memory state around the buggy address: [ 31.887998] fff00000c9a59f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 31.888042] fff00000c9a59f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 31.888085] >fff00000c9a5a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.888123] ^ [ 31.888151] fff00000c9a5a080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc [ 31.888193] fff00000c9a5a100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.888233] ==================================================================
[ 26.015538] ================================================================== [ 26.016038] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x3e3/0x510 [ 26.016614] Read of size 1 at addr ffff8881060a0000 by task kunit_try_catch/262 [ 26.016881] [ 26.016971] CPU: 1 UID: 0 PID: 262 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7-next-20250723 #1 PREEMPT(voluntary) [ 26.017026] Tainted: [B]=BAD_PAGE, [N]=TEST [ 26.017038] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 26.017062] Call Trace: [ 26.017076] <TASK> [ 26.017096] dump_stack_lvl+0x73/0xb0 [ 26.017128] print_report+0xd1/0x640 [ 26.017162] ? __virt_addr_valid+0x1db/0x2d0 [ 26.017213] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 26.017237] ? kasan_complete_mode_report_info+0x64/0x200 [ 26.017264] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 26.017303] kasan_report+0x141/0x180 [ 26.017325] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 26.017367] __asan_report_load1_noabort+0x18/0x20 [ 26.017417] kmem_cache_rcu_uaf+0x3e3/0x510 [ 26.017441] ? __pfx_kmem_cache_rcu_uaf+0x10/0x10 [ 26.017464] ? finish_task_switch.isra.0+0x153/0x700 [ 26.017488] ? __switch_to+0x47/0xf80 [ 26.017519] ? __pfx_read_tsc+0x10/0x10 [ 26.017541] ? ktime_get_ts64+0x86/0x230 [ 26.017569] kunit_try_run_case+0x1a5/0x480 [ 26.017596] ? __pfx_kunit_try_run_case+0x10/0x10 [ 26.017619] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 26.017646] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 26.017670] ? __kthread_parkme+0x82/0x180 [ 26.017692] ? preempt_count_sub+0x50/0x80 [ 26.017715] ? __pfx_kunit_try_run_case+0x10/0x10 [ 26.017739] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 26.017763] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 26.017786] kthread+0x337/0x6f0 [ 26.017807] ? trace_preempt_on+0x20/0xc0 [ 26.017832] ? __pfx_kthread+0x10/0x10 [ 26.017853] ? _raw_spin_unlock_irq+0x47/0x80 [ 26.017876] ? calculate_sigpending+0x7b/0xa0 [ 26.017901] ? __pfx_kthread+0x10/0x10 [ 26.017924] ret_from_fork+0x116/0x1d0 [ 26.017944] ? __pfx_kthread+0x10/0x10 [ 26.017983] ret_from_fork_asm+0x1a/0x30 [ 26.018016] </TASK> [ 26.018028] [ 26.027866] Allocated by task 262: [ 26.027995] kasan_save_stack+0x45/0x70 [ 26.028323] kasan_save_track+0x18/0x40 [ 26.028609] kasan_save_alloc_info+0x3b/0x50 [ 26.028778] __kasan_slab_alloc+0x91/0xa0 [ 26.028913] kmem_cache_alloc_noprof+0x123/0x3f0 [ 26.029267] kmem_cache_rcu_uaf+0x155/0x510 [ 26.029503] kunit_try_run_case+0x1a5/0x480 [ 26.029849] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 26.030557] kthread+0x337/0x6f0 [ 26.030749] ret_from_fork+0x116/0x1d0 [ 26.030917] ret_from_fork_asm+0x1a/0x30 [ 26.031594] [ 26.031689] Freed by task 0: [ 26.031798] kasan_save_stack+0x45/0x70 [ 26.031954] kasan_save_track+0x18/0x40 [ 26.032275] kasan_save_free_info+0x3f/0x60 [ 26.032856] __kasan_slab_free+0x56/0x70 [ 26.033031] slab_free_after_rcu_debug+0xe4/0x310 [ 26.033344] rcu_core+0x66f/0x1c40 [ 26.033611] rcu_core_si+0x12/0x20 [ 26.033774] handle_softirqs+0x209/0x730 [ 26.033939] __irq_exit_rcu+0xc9/0x110 [ 26.034354] irq_exit_rcu+0x12/0x20 [ 26.034746] sysvec_apic_timer_interrupt+0x81/0x90 [ 26.034924] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 26.035335] [ 26.035695] Last potentially related work creation: [ 26.035918] kasan_save_stack+0x45/0x70 [ 26.036088] kasan_record_aux_stack+0xb2/0xc0 [ 26.036293] kmem_cache_free+0x131/0x420 [ 26.036507] kmem_cache_rcu_uaf+0x194/0x510 [ 26.036719] kunit_try_run_case+0x1a5/0x480 [ 26.036912] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 26.037630] kthread+0x337/0x6f0 [ 26.037773] ret_from_fork+0x116/0x1d0 [ 26.038114] ret_from_fork_asm+0x1a/0x30 [ 26.038585] [ 26.038681] The buggy address belongs to the object at ffff8881060a0000 [ 26.038681] which belongs to the cache test_cache of size 200 [ 26.039474] The buggy address is located 0 bytes inside of [ 26.039474] freed 200-byte region [ffff8881060a0000, ffff8881060a00c8) [ 26.039991] [ 26.040077] The buggy address belongs to the physical page: [ 26.040326] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1060a0 [ 26.040678] flags: 0x200000000000000(node=0|zone=2) [ 26.040896] page_type: f5(slab) [ 26.041524] raw: 0200000000000000 ffff888101242a00 dead000000000122 0000000000000000 [ 26.041808] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000 [ 26.042394] page dumped because: kasan: bad access detected [ 26.042735] [ 26.042834] Memory state around the buggy address: [ 26.043027] ffff88810609ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.043542] ffff88810609ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.043854] >ffff8881060a0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.044357] ^ [ 26.044547] ffff8881060a0080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc [ 26.045056] ffff8881060a0100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.045569] ==================================================================