Date
July 18, 2025, 1:09 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.920876] ================================================================== [ 31.921009] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 31.921093] Read of size 4 at addr fff00000c401e0c0 by task swapper/0/0 [ 31.921141] [ 31.921181] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G B N 6.16.0-rc6-next-20250718 #1 PREEMPT [ 31.921266] Tainted: [B]=BAD_PAGE, [N]=TEST [ 31.921292] Hardware name: linux,dummy-virt (DT) [ 31.921326] Call trace: [ 31.921350] show_stack+0x20/0x38 (C) [ 31.921401] dump_stack_lvl+0x8c/0xd0 [ 31.921449] print_report+0x118/0x5e8 [ 31.921493] kasan_report+0xdc/0x128 [ 31.921535] __asan_report_load4_noabort+0x20/0x30 [ 31.921581] rcu_uaf_reclaim+0x64/0x70 [ 31.921625] rcu_core+0x9f4/0x1e58 [ 31.921670] rcu_core_si+0x18/0x30 [ 31.921713] handle_softirqs+0x374/0xb28 [ 31.921758] __do_softirq+0x1c/0x28 [ 31.921801] ____do_softirq+0x18/0x30 [ 31.921842] call_on_irq_stack+0x24/0x30 [ 31.921885] do_softirq_own_stack+0x24/0x38 [ 31.921931] __irq_exit_rcu+0x1fc/0x318 [ 31.921975] irq_exit_rcu+0x1c/0x80 [ 31.922016] el1_interrupt+0x38/0x58 [ 31.922067] el1h_64_irq_handler+0x18/0x28 [ 31.922198] el1h_64_irq+0x6c/0x70 [ 31.922316] arch_local_irq_enable+0x4/0x8 (P) [ 31.922683] do_idle+0x384/0x4e8 [ 31.922773] cpu_startup_entry+0x68/0x80 [ 31.922831] rest_init+0x160/0x188 [ 31.922874] start_kernel+0x30c/0x3d0 [ 31.922930] __primary_switched+0x8c/0xa0 [ 31.922982] [ 31.923002] Allocated by task 229: [ 31.923032] kasan_save_stack+0x3c/0x68 [ 31.923072] kasan_save_track+0x20/0x40 [ 31.923122] kasan_save_alloc_info+0x40/0x58 [ 31.923161] __kasan_kmalloc+0xd4/0xd8 [ 31.923195] __kmalloc_cache_noprof+0x16c/0x3c0 [ 31.923237] rcu_uaf+0xb0/0x2d8 [ 31.923282] kunit_try_run_case+0x170/0x3f0 [ 31.923321] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.923364] kthread+0x328/0x630 [ 31.923396] ret_from_fork+0x10/0x20 [ 31.923432] [ 31.923451] Freed by task 0: [ 31.923477] kasan_save_stack+0x3c/0x68 [ 31.923511] kasan_save_track+0x20/0x40 [ 31.923546] kasan_save_free_info+0x4c/0x78 [ 31.923584] __kasan_slab_free+0x6c/0x98 [ 31.923821] kfree+0x214/0x3c8 [ 31.923872] rcu_uaf_reclaim+0x28/0x70 [ 31.923910] rcu_core+0x9f4/0x1e58 [ 31.923947] rcu_core_si+0x18/0x30 [ 31.923981] handle_softirqs+0x374/0xb28 [ 31.924215] __do_softirq+0x1c/0x28 [ 31.924307] [ 31.924535] Last potentially related work creation: [ 31.924596] kasan_save_stack+0x3c/0x68 [ 31.924637] kasan_record_aux_stack+0xb4/0xc8 [ 31.924677] __call_rcu_common.constprop.0+0x74/0x8c8 [ 31.924718] call_rcu+0x18/0x30 [ 31.924754] rcu_uaf+0x14c/0x2d8 [ 31.924793] kunit_try_run_case+0x170/0x3f0 [ 31.924830] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.924873] kthread+0x328/0x630 [ 31.924919] ret_from_fork+0x10/0x20 [ 31.924994] [ 31.925184] The buggy address belongs to the object at fff00000c401e0c0 [ 31.925184] which belongs to the cache kmalloc-32 of size 32 [ 31.925405] The buggy address is located 0 bytes inside of [ 31.925405] freed 32-byte region [fff00000c401e0c0, fff00000c401e0e0) [ 31.925720] [ 31.925793] The buggy address belongs to the physical page: [ 31.926065] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10401e [ 31.926374] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.926705] page_type: f5(slab) [ 31.926808] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 31.927288] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 31.927360] page dumped because: kasan: bad access detected [ 31.927463] [ 31.927549] Memory state around the buggy address: [ 31.927603] fff00000c401df80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 31.927663] fff00000c401e000: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 31.927740] >fff00000c401e080: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 31.927779] ^ [ 31.927949] fff00000c401e100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.927996] fff00000c401e180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.928159] ==================================================================
[ 25.398059] ================================================================== [ 25.398562] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 25.399051] Read of size 4 at addr ffff888102b41ac0 by task swapper/1/0 [ 25.399352] [ 25.399484] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.16.0-rc6-next-20250718 #1 PREEMPT(voluntary) [ 25.399533] Tainted: [B]=BAD_PAGE, [N]=TEST [ 25.399545] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 25.399567] Call Trace: [ 25.399595] <IRQ> [ 25.399611] dump_stack_lvl+0x73/0xb0 [ 25.399645] print_report+0xd1/0x640 [ 25.399691] ? __virt_addr_valid+0x1db/0x2d0 [ 25.399715] ? rcu_uaf_reclaim+0x50/0x60 [ 25.399734] ? kasan_complete_mode_report_info+0x64/0x200 [ 25.399777] ? rcu_uaf_reclaim+0x50/0x60 [ 25.399796] kasan_report+0x141/0x180 [ 25.399828] ? rcu_uaf_reclaim+0x50/0x60 [ 25.399852] __asan_report_load4_noabort+0x18/0x20 [ 25.399875] rcu_uaf_reclaim+0x50/0x60 [ 25.399895] rcu_core+0x66f/0x1c40 [ 25.399923] ? __pfx_rcu_core+0x10/0x10 [ 25.399944] ? ktime_get+0x6b/0x150 [ 25.399966] ? handle_softirqs+0x18e/0x730 [ 25.399989] rcu_core_si+0x12/0x20 [ 25.400009] handle_softirqs+0x209/0x730 [ 25.400028] ? hrtimer_interrupt+0x2fe/0x780 [ 25.400054] ? __pfx_handle_softirqs+0x10/0x10 [ 25.400153] __irq_exit_rcu+0xc9/0x110 [ 25.400179] irq_exit_rcu+0x12/0x20 [ 25.400198] sysvec_apic_timer_interrupt+0x81/0x90 [ 25.400236] </IRQ> [ 25.400267] <TASK> [ 25.400280] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 25.400397] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 25.400627] Code: 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 63 b3 16 00 fb f4 <e9> bc 2a 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 [ 25.400707] RSP: 0000:ffff88810087fdc8 EFLAGS: 00010212 [ 25.400795] RAX: ffff8881a3313000 RBX: ffff88810085b000 RCX: ffffffffb59209a5 [ 25.401014] RDX: ffffed102b626193 RSI: 0000000000000004 RDI: 000000000001e39c [ 25.401061] RBP: ffff88810087fdd0 R08: 0000000000000001 R09: ffffed102b626192 [ 25.401104] R10: ffff88815b130c93 R11: ffff88815b1363c8 R12: 0000000000000001 [ 25.401148] R13: ffffed102010b600 R14: ffffffffb75fb2d0 R15: 0000000000000000 [ 25.401206] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 25.401279] ? default_idle+0xd/0x20 [ 25.401299] arch_cpu_idle+0xd/0x20 [ 25.401317] default_idle_call+0x48/0x80 [ 25.401336] do_idle+0x379/0x4f0 [ 25.401362] ? __pfx_do_idle+0x10/0x10 [ 25.401382] ? _raw_spin_unlock_irqrestore+0x49/0x90 [ 25.401415] ? complete+0x15b/0x1d0 [ 25.401441] cpu_startup_entry+0x5c/0x70 [ 25.401464] start_secondary+0x211/0x290 [ 25.401486] ? __pfx_start_secondary+0x10/0x10 [ 25.401511] common_startup_64+0x13e/0x148 [ 25.401542] </TASK> [ 25.401553] [ 25.414419] Allocated by task 246: [ 25.414938] kasan_save_stack+0x45/0x70 [ 25.415447] kasan_save_track+0x18/0x40 [ 25.415614] kasan_save_alloc_info+0x3b/0x50 [ 25.415998] __kasan_kmalloc+0xb7/0xc0 [ 25.416162] __kmalloc_cache_noprof+0x189/0x420 [ 25.416630] rcu_uaf+0xb0/0x330 [ 25.417028] kunit_try_run_case+0x1a5/0x480 [ 25.417199] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.417539] kthread+0x337/0x6f0 [ 25.417819] ret_from_fork+0x116/0x1d0 [ 25.418245] ret_from_fork_asm+0x1a/0x30 [ 25.418442] [ 25.418508] Freed by task 0: [ 25.418684] kasan_save_stack+0x45/0x70 [ 25.418905] kasan_save_track+0x18/0x40 [ 25.419435] kasan_save_free_info+0x3f/0x60 [ 25.419576] __kasan_slab_free+0x56/0x70 [ 25.419790] kfree+0x222/0x3f0 [ 25.420259] rcu_uaf_reclaim+0x1f/0x60 [ 25.420430] rcu_core+0x66f/0x1c40 [ 25.420601] rcu_core_si+0x12/0x20 [ 25.420799] handle_softirqs+0x209/0x730 [ 25.421048] __irq_exit_rcu+0xc9/0x110 [ 25.421469] irq_exit_rcu+0x12/0x20 [ 25.421641] sysvec_apic_timer_interrupt+0x81/0x90 [ 25.422091] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 25.422335] [ 25.422457] Last potentially related work creation: [ 25.422634] kasan_save_stack+0x45/0x70 [ 25.422824] kasan_record_aux_stack+0xb2/0xc0 [ 25.423172] __call_rcu_common.constprop.0+0x7b/0x9e0 [ 25.423350] call_rcu+0x12/0x20 [ 25.423513] rcu_uaf+0x168/0x330 [ 25.423696] kunit_try_run_case+0x1a5/0x480 [ 25.423892] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.424254] kthread+0x337/0x6f0 [ 25.424457] ret_from_fork+0x116/0x1d0 [ 25.424637] ret_from_fork_asm+0x1a/0x30 [ 25.425463] [ 25.425595] The buggy address belongs to the object at ffff888102b41ac0 [ 25.425595] which belongs to the cache kmalloc-32 of size 32 [ 25.426347] The buggy address is located 0 bytes inside of [ 25.426347] freed 32-byte region [ffff888102b41ac0, ffff888102b41ae0) [ 25.426847] [ 25.426923] The buggy address belongs to the physical page: [ 25.427138] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102b41 [ 25.427630] flags: 0x200000000000000(node=0|zone=2) [ 25.427911] page_type: f5(slab) [ 25.428139] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 25.428540] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 25.428845] page dumped because: kasan: bad access detected [ 25.429093] [ 25.429239] Memory state around the buggy address: [ 25.429483] ffff888102b41980: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 25.429775] ffff888102b41a00: fa fb fb fb fc fc fc fc 00 00 07 fc fc fc fc fc [ 25.430335] >ffff888102b41a80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 25.430642] ^ [ 25.430879] ffff888102b41b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.431261] ffff888102b41b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.431633] ==================================================================