Date
July 4, 2025, 11:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 29.890834] ================================================================== [ 29.890975] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 29.891329] Read of size 4 at addr fff00000c9b3d900 by task swapper/0/0 [ 29.891931] [ 29.891974] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G B N 6.16.0-rc4-next-20250704 #1 PREEMPT [ 29.892065] Tainted: [B]=BAD_PAGE, [N]=TEST [ 29.892145] Hardware name: linux,dummy-virt (DT) [ 29.892179] Call trace: [ 29.892314] show_stack+0x20/0x38 (C) [ 29.892401] dump_stack_lvl+0x8c/0xd0 [ 29.892450] print_report+0x118/0x608 [ 29.892733] kasan_report+0xdc/0x128 [ 29.892832] __asan_report_load4_noabort+0x20/0x30 [ 29.892886] rcu_uaf_reclaim+0x64/0x70 [ 29.892978] rcu_core+0x9f4/0x1e20 [ 29.893032] rcu_core_si+0x18/0x30 [ 29.893232] handle_softirqs+0x374/0xb28 [ 29.893304] __do_softirq+0x1c/0x28 [ 29.893364] ____do_softirq+0x18/0x30 [ 29.893641] call_on_irq_stack+0x24/0x30 [ 29.893766] do_softirq_own_stack+0x24/0x38 [ 29.893820] __irq_exit_rcu+0x1fc/0x318 [ 29.893868] irq_exit_rcu+0x1c/0x80 [ 29.894226] el1_interrupt+0x38/0x58 [ 29.894338] el1h_64_irq_handler+0x18/0x28 [ 29.894532] el1h_64_irq+0x6c/0x70 [ 29.894833] arch_local_irq_enable+0x4/0x8 (P) [ 29.895076] do_idle+0x384/0x4e8 [ 29.895387] cpu_startup_entry+0x68/0x80 [ 29.895646] rest_init+0x160/0x188 [ 29.895826] start_kernel+0x30c/0x3d0 [ 29.896174] __primary_switched+0x8c/0xa0 [ 29.896324] [ 29.896529] Allocated by task 231: [ 29.896708] kasan_save_stack+0x3c/0x68 [ 29.897360] kasan_save_track+0x20/0x40 [ 29.897537] kasan_save_alloc_info+0x40/0x58 [ 29.897588] __kasan_kmalloc+0xd4/0xd8 [ 29.897629] __kmalloc_cache_noprof+0x16c/0x3c0 [ 29.897671] rcu_uaf+0xb0/0x2d8 [ 29.897706] kunit_try_run_case+0x170/0x3f0 [ 29.897919] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.898135] kthread+0x328/0x630 [ 29.898345] ret_from_fork+0x10/0x20 [ 29.898533] [ 29.898689] Freed by task 0: [ 29.898721] kasan_save_stack+0x3c/0x68 [ 29.898795] kasan_save_track+0x20/0x40 [ 29.899005] kasan_save_free_info+0x4c/0x78 [ 29.899156] __kasan_slab_free+0x6c/0x98 [ 29.899202] kfree+0x214/0x3c8 [ 29.899239] rcu_uaf_reclaim+0x28/0x70 [ 29.899275] rcu_core+0x9f4/0x1e20 [ 29.899330] rcu_core_si+0x18/0x30 [ 29.899409] handle_softirqs+0x374/0xb28 [ 29.899450] __do_softirq+0x1c/0x28 [ 29.899484] [ 29.899540] Last potentially related work creation: [ 29.899601] kasan_save_stack+0x3c/0x68 [ 29.899655] kasan_record_aux_stack+0xb4/0xc8 [ 29.899692] __call_rcu_common.constprop.0+0x74/0x8c8 [ 29.899745] call_rcu+0x18/0x30 [ 29.899784] rcu_uaf+0x14c/0x2d8 [ 29.899818] kunit_try_run_case+0x170/0x3f0 [ 29.899859] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 29.900457] kthread+0x328/0x630 [ 29.900525] ret_from_fork+0x10/0x20 [ 29.900921] [ 29.901399] The buggy address belongs to the object at fff00000c9b3d900 [ 29.901399] which belongs to the cache kmalloc-32 of size 32 [ 29.901966] The buggy address is located 0 bytes inside of [ 29.901966] freed 32-byte region [fff00000c9b3d900, fff00000c9b3d920) [ 29.902203] [ 29.902260] The buggy address belongs to the physical page: [ 29.902335] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109b3d [ 29.902497] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 29.902551] page_type: f5(slab) [ 29.902593] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 29.902814] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 29.902984] page dumped because: kasan: bad access detected [ 29.903143] [ 29.903343] Memory state around the buggy address: [ 29.903462] fff00000c9b3d800: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 29.903536] fff00000c9b3d880: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 29.903759] >fff00000c9b3d900: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 29.903924] ^ [ 29.904060] fff00000c9b3d980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 29.904673] fff00000c9b3da00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 29.904783] ==================================================================
[ 25.525429] ================================================================== [ 25.525954] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 25.526555] Read of size 4 at addr ffff888105ab0480 by task swapper/0/0 [ 25.526895] [ 25.527029] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G B N 6.16.0-rc4-next-20250704 #1 PREEMPT(voluntary) [ 25.527090] Tainted: [B]=BAD_PAGE, [N]=TEST [ 25.527104] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 25.527130] Call Trace: [ 25.527163] <IRQ> [ 25.527186] dump_stack_lvl+0x73/0xb0 [ 25.527221] print_report+0xd1/0x650 [ 25.527277] ? __virt_addr_valid+0x1db/0x2d0 [ 25.527384] ? rcu_uaf_reclaim+0x50/0x60 [ 25.527422] ? kasan_complete_mode_report_info+0x64/0x200 [ 25.527450] ? rcu_uaf_reclaim+0x50/0x60 [ 25.527473] kasan_report+0x141/0x180 [ 25.527497] ? rcu_uaf_reclaim+0x50/0x60 [ 25.527524] __asan_report_load4_noabort+0x18/0x20 [ 25.527550] rcu_uaf_reclaim+0x50/0x60 [ 25.527572] rcu_core+0x66f/0x1c40 [ 25.527605] ? __pfx_rcu_core+0x10/0x10 [ 25.527629] ? ktime_get+0x6b/0x150 [ 25.527659] rcu_core_si+0x12/0x20 [ 25.527683] handle_softirqs+0x209/0x730 [ 25.527707] ? hrtimer_interrupt+0x2fe/0x780 [ 25.527738] ? __pfx_handle_softirqs+0x10/0x10 [ 25.527766] __irq_exit_rcu+0xc9/0x110 [ 25.527789] irq_exit_rcu+0x12/0x20 [ 25.527811] sysvec_apic_timer_interrupt+0x81/0x90 [ 25.527841] </IRQ> [ 25.527875] <TASK> [ 25.527890] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 25.527991] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 25.528454] 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 a3 1f 19 00 fb f4 <e9> 7c 1d 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 [ 25.528556] RSP: 0000:fffffffface07dd8 EFLAGS: 00010212 [ 25.528658] RAX: ffff8881ace24000 RBX: fffffffface1cac0 RCX: ffffffffabcf9225 [ 25.528726] RDX: ffffed102b606193 RSI: 0000000000000004 RDI: 000000000011d25c [ 25.528773] RBP: fffffffface07de0 R08: 0000000000000001 R09: ffffed102b606192 [ 25.528819] R10: ffff88815b030c93 R11: 000000000004e000 R12: 0000000000000000 [ 25.528867] R13: fffffbfff59c3958 R14: ffffffffad9efad0 R15: 0000000000000000 [ 25.528931] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 25.528991] ? default_idle+0xd/0x20 [ 25.529014] arch_cpu_idle+0xd/0x20 [ 25.529036] default_idle_call+0x48/0x80 [ 25.529060] do_idle+0x379/0x4f0 [ 25.529089] ? __pfx_do_idle+0x10/0x10 [ 25.529120] cpu_startup_entry+0x5c/0x70 [ 25.529147] rest_init+0x11a/0x140 [ 25.529181] ? acpi_subsystem_init+0x5d/0x150 [ 25.529211] start_kernel+0x352/0x400 [ 25.529236] x86_64_start_reservations+0x1c/0x30 [ 25.529260] x86_64_start_kernel+0x10d/0x120 [ 25.529283] common_startup_64+0x13e/0x148 [ 25.529319] </TASK> [ 25.529334] [ 25.545417] Allocated by task 247: [ 25.545586] kasan_save_stack+0x45/0x70 [ 25.545821] kasan_save_track+0x18/0x40 [ 25.546201] kasan_save_alloc_info+0x3b/0x50 [ 25.546490] __kasan_kmalloc+0xb7/0xc0 [ 25.546635] __kmalloc_cache_noprof+0x189/0x420 [ 25.546918] rcu_uaf+0xb0/0x330 [ 25.547149] kunit_try_run_case+0x1a5/0x480 [ 25.547430] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.547739] kthread+0x337/0x6f0 [ 25.547972] ret_from_fork+0x116/0x1d0 [ 25.548202] ret_from_fork_asm+0x1a/0x30 [ 25.548766] [ 25.548901] Freed by task 0: [ 25.549101] kasan_save_stack+0x45/0x70 [ 25.549448] kasan_save_track+0x18/0x40 [ 25.549662] kasan_save_free_info+0x3f/0x60 [ 25.549915] __kasan_slab_free+0x56/0x70 [ 25.550152] kfree+0x222/0x3f0 [ 25.550327] rcu_uaf_reclaim+0x1f/0x60 [ 25.550722] rcu_core+0x66f/0x1c40 [ 25.550927] rcu_core_si+0x12/0x20 [ 25.551147] handle_softirqs+0x209/0x730 [ 25.551444] __irq_exit_rcu+0xc9/0x110 [ 25.551639] irq_exit_rcu+0x12/0x20 [ 25.551907] sysvec_apic_timer_interrupt+0x81/0x90 [ 25.552076] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 25.552791] [ 25.552946] Last potentially related work creation: [ 25.553160] kasan_save_stack+0x45/0x70 [ 25.553312] kasan_record_aux_stack+0xb2/0xc0 [ 25.554565] __call_rcu_common.constprop.0+0x7b/0x9e0 [ 25.555029] call_rcu+0x12/0x20 [ 25.555182] rcu_uaf+0x168/0x330 [ 25.555310] kunit_try_run_case+0x1a5/0x480 [ 25.556490] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.556691] kthread+0x337/0x6f0 [ 25.557691] ret_from_fork+0x116/0x1d0 [ 25.558062] ret_from_fork_asm+0x1a/0x30 [ 25.558888] [ 25.559023] The buggy address belongs to the object at ffff888105ab0480 [ 25.559023] which belongs to the cache kmalloc-32 of size 32 [ 25.560453] The buggy address is located 0 bytes inside of [ 25.560453] freed 32-byte region [ffff888105ab0480, ffff888105ab04a0) [ 25.561775] [ 25.561892] The buggy address belongs to the physical page: [ 25.562084] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105ab0 [ 25.562828] flags: 0x200000000000000(node=0|zone=2) [ 25.563761] page_type: f5(slab) [ 25.564341] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 25.564698] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 25.565467] page dumped because: kasan: bad access detected [ 25.565740] [ 25.565834] Memory state around the buggy address: [ 25.566626] ffff888105ab0380: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 25.567354] ffff888105ab0400: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 25.567973] >ffff888105ab0480: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 25.568560] ^ [ 25.568735] ffff888105ab0500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.569823] ffff888105ab0580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.570418] ==================================================================