Date
July 24, 2025, 4:41 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 32.957394] ================================================================== [ 32.957535] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 32.957606] Read of size 4 at addr fff00000c9a90400 by task swapper/0/0 [ 32.957655] [ 32.957701] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G B N 6.16.0-rc7-next-20250724 #1 PREEMPT [ 32.957859] Tainted: [B]=BAD_PAGE, [N]=TEST [ 32.957899] Hardware name: linux,dummy-virt (DT) [ 32.957935] Call trace: [ 32.957959] show_stack+0x20/0x38 (C) [ 32.958010] dump_stack_lvl+0x8c/0xd0 [ 32.958055] print_report+0x118/0x5e8 [ 32.958098] kasan_report+0xdc/0x128 [ 32.958153] __asan_report_load4_noabort+0x20/0x30 [ 32.958202] rcu_uaf_reclaim+0x64/0x70 [ 32.958255] rcu_core+0x9f4/0x1e58 [ 32.958307] rcu_core_si+0x18/0x30 [ 32.958351] handle_softirqs+0x374/0xb28 [ 32.958398] __do_softirq+0x1c/0x28 [ 32.958444] ____do_softirq+0x18/0x30 [ 32.958496] call_on_irq_stack+0x30/0x48 [ 32.958542] do_softirq_own_stack+0x24/0x38 [ 32.958587] __irq_exit_rcu+0x1fc/0x318 [ 32.958639] irq_exit_rcu+0x1c/0x80 [ 32.958695] el1_interrupt+0x38/0x58 [ 32.958742] el1h_64_irq_handler+0x18/0x28 [ 32.958800] el1h_64_irq+0x6c/0x70 [ 32.958897] arch_local_irq_enable+0x4/0x8 (P) [ 32.958951] do_idle+0x384/0x4e8 [ 32.958995] cpu_startup_entry+0x68/0x80 [ 32.959041] rest_init+0x160/0x188 [ 32.959086] start_kernel+0x30c/0x3d0 [ 32.959136] __primary_switched+0x8c/0xa0 [ 32.959199] [ 32.959220] Allocated by task 229: [ 32.959249] kasan_save_stack+0x3c/0x68 [ 32.959289] kasan_save_track+0x20/0x40 [ 32.959334] kasan_save_alloc_info+0x40/0x58 [ 32.959374] __kasan_kmalloc+0xd4/0xd8 [ 32.959410] __kmalloc_cache_noprof+0x16c/0x3c0 [ 32.959451] rcu_uaf+0xb0/0x2d8 [ 32.959486] kunit_try_run_case+0x170/0x3f0 [ 32.959535] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 32.959587] kthread+0x328/0x630 [ 32.959623] ret_from_fork+0x10/0x20 [ 32.959658] [ 32.959687] Freed by task 0: [ 32.959720] kasan_save_stack+0x3c/0x68 [ 32.960666] kasan_save_track+0x20/0x40 [ 32.960818] kasan_save_free_info+0x4c/0x78 [ 32.960882] __kasan_slab_free+0x6c/0x98 [ 32.960919] kfree+0x214/0x3c8 [ 32.961027] rcu_uaf_reclaim+0x28/0x70 [ 32.961151] rcu_core+0x9f4/0x1e58 [ 32.961251] rcu_core_si+0x18/0x30 [ 32.961297] handle_softirqs+0x374/0xb28 [ 32.961360] __do_softirq+0x1c/0x28 [ 32.961439] [ 32.961481] Last potentially related work creation: [ 32.961569] kasan_save_stack+0x3c/0x68 [ 32.961708] kasan_record_aux_stack+0xb4/0xc8 [ 32.961778] __call_rcu_common.constprop.0+0x74/0x8c8 [ 32.961820] call_rcu+0x18/0x30 [ 32.961854] rcu_uaf+0x14c/0x2d8 [ 32.961888] kunit_try_run_case+0x170/0x3f0 [ 32.961925] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 32.961968] kthread+0x328/0x630 [ 32.962000] ret_from_fork+0x10/0x20 [ 32.962041] [ 32.962068] The buggy address belongs to the object at fff00000c9a90400 [ 32.962068] which belongs to the cache kmalloc-32 of size 32 [ 32.962133] The buggy address is located 0 bytes inside of [ 32.962133] freed 32-byte region [fff00000c9a90400, fff00000c9a90420) [ 32.962194] [ 32.962215] The buggy address belongs to the physical page: [ 32.962279] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109a90 [ 32.962336] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 32.962389] page_type: f5(slab) [ 32.962432] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 32.962559] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 32.962708] page dumped because: kasan: bad access detected [ 32.962761] [ 32.962779] Memory state around the buggy address: [ 32.963140] fff00000c9a90300: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 32.963195] fff00000c9a90380: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 32.963363] >fff00000c9a90400: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 32.963476] ^ [ 32.963526] fff00000c9a90480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.963626] fff00000c9a90500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.963715] ==================================================================
[ 27.425044] ================================================================== [ 27.425477] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 27.425743] Read of size 4 at addr ffff888104fcb8c0 by task swapper/1/0 [ 27.425948] [ 27.426039] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B W N 6.16.0-rc7-next-20250724 #1 PREEMPT(voluntary) [ 27.426092] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST [ 27.426106] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 27.426128] Call Trace: [ 27.426156] <IRQ> [ 27.426178] dump_stack_lvl+0x73/0xb0 [ 27.426207] print_report+0xd1/0x640 [ 27.426230] ? __virt_addr_valid+0x1db/0x2d0 [ 27.426255] ? rcu_uaf_reclaim+0x50/0x60 [ 27.426274] ? kasan_complete_mode_report_info+0x64/0x200 [ 27.426299] ? rcu_uaf_reclaim+0x50/0x60 [ 27.426318] kasan_report+0x141/0x180 [ 27.426339] ? rcu_uaf_reclaim+0x50/0x60 [ 27.426363] __asan_report_load4_noabort+0x18/0x20 [ 27.426386] rcu_uaf_reclaim+0x50/0x60 [ 27.426405] rcu_core+0x66f/0x1c40 [ 27.426433] ? __pfx_rcu_core+0x10/0x10 [ 27.426454] ? ktime_get+0x6b/0x150 [ 27.426476] ? handle_softirqs+0x18e/0x730 [ 27.426500] rcu_core_si+0x12/0x20 [ 27.426519] handle_softirqs+0x209/0x730 [ 27.426538] ? hrtimer_interrupt+0x2fe/0x780 [ 27.426560] ? __pfx_handle_softirqs+0x10/0x10 [ 27.427173] __irq_exit_rcu+0xc9/0x110 [ 27.427215] irq_exit_rcu+0x12/0x20 [ 27.427237] sysvec_apic_timer_interrupt+0x81/0x90 [ 27.427268] </IRQ> [ 27.427278] <TASK> [ 27.427289] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 27.427366] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 27.427394] 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 93 15 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 [ 27.427433] RSP: 0000:ffff88810087fdc8 EFLAGS: 00010202 [ 27.427470] RAX: ffff8881aff0d000 RBX: ffff88810085b000 RCX: ffffffffa8d329a5 [ 27.427491] RDX: ffffed102b626193 RSI: 0000000000000004 RDI: 000000000001bf84 [ 27.427509] RBP: ffff88810087fdd0 R08: 0000000000000001 R09: ffffed102b626192 [ 27.427528] R10: ffff88815b130c93 R11: ffff88815b1363c8 R12: 0000000000000001 [ 27.427547] R13: ffffed102010b600 R14: ffffffffaa9ff1d0 R15: 0000000000000000 [ 27.427608] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 27.427663] ? default_idle+0xd/0x20 [ 27.427684] arch_cpu_idle+0xd/0x20 [ 27.427704] default_idle_call+0x48/0x80 [ 27.427724] do_idle+0x379/0x4f0 [ 27.427751] ? __pfx_do_idle+0x10/0x10 [ 27.427771] ? _raw_spin_unlock_irqrestore+0x49/0x90 [ 27.427796] ? complete+0x15b/0x1d0 [ 27.427822] cpu_startup_entry+0x5c/0x70 [ 27.427845] start_secondary+0x211/0x290 [ 27.427869] ? __pfx_start_secondary+0x10/0x10 [ 27.427894] common_startup_64+0x13e/0x148 [ 27.427929] </TASK> [ 27.427940] [ 27.441655] Allocated by task 246: [ 27.441824] kasan_save_stack+0x45/0x70 [ 27.442327] kasan_save_track+0x18/0x40 [ 27.442758] kasan_save_alloc_info+0x3b/0x50 [ 27.443038] __kasan_kmalloc+0xb7/0xc0 [ 27.443213] __kmalloc_cache_noprof+0x189/0x420 [ 27.443416] rcu_uaf+0xb0/0x330 [ 27.443565] kunit_try_run_case+0x1a5/0x480 [ 27.443720] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 27.443981] kthread+0x337/0x6f0 [ 27.444116] ret_from_fork+0x116/0x1d0 [ 27.444242] ret_from_fork_asm+0x1a/0x30 [ 27.444394] [ 27.444482] Freed by task 0: [ 27.444677] kasan_save_stack+0x45/0x70 [ 27.444848] kasan_save_track+0x18/0x40 [ 27.445121] kasan_save_free_info+0x3f/0x60 [ 27.445262] __kasan_slab_free+0x56/0x70 [ 27.445387] kfree+0x222/0x3f0 [ 27.445513] rcu_uaf_reclaim+0x1f/0x60 [ 27.445698] rcu_core+0x66f/0x1c40 [ 27.445865] rcu_core_si+0x12/0x20 [ 27.446181] handle_softirqs+0x209/0x730 [ 27.446365] __irq_exit_rcu+0xc9/0x110 [ 27.446487] irq_exit_rcu+0x12/0x20 [ 27.446612] sysvec_apic_timer_interrupt+0x81/0x90 [ 27.446834] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 27.447275] [ 27.447414] Last potentially related work creation: [ 27.447657] kasan_save_stack+0x45/0x70 [ 27.447863] kasan_record_aux_stack+0xb2/0xc0 [ 27.448098] __call_rcu_common.constprop.0+0x7b/0x9e0 [ 27.448415] call_rcu+0x12/0x20 [ 27.449451] rcu_uaf+0x168/0x330 [ 27.449612] kunit_try_run_case+0x1a5/0x480 [ 27.449837] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 27.450179] kthread+0x337/0x6f0 [ 27.450373] ret_from_fork+0x116/0x1d0 [ 27.450687] ret_from_fork_asm+0x1a/0x30 [ 27.450907] [ 27.451354] The buggy address belongs to the object at ffff888104fcb8c0 [ 27.451354] which belongs to the cache kmalloc-32 of size 32 [ 27.451914] The buggy address is located 0 bytes inside of [ 27.451914] freed 32-byte region [ffff888104fcb8c0, ffff888104fcb8e0) [ 27.452510] [ 27.452837] The buggy address belongs to the physical page: [ 27.453137] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x104fcb [ 27.453653] flags: 0x200000000000000(node=0|zone=2) [ 27.454018] page_type: f5(slab) [ 27.454197] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 27.454613] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 27.455190] page dumped because: kasan: bad access detected [ 27.455519] [ 27.455624] Memory state around the buggy address: [ 27.456109] ffff888104fcb780: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 27.456494] ffff888104fcb800: 00 00 00 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 27.456930] >ffff888104fcb880: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 27.457283] ^ [ 27.457531] ffff888104fcb900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.457989] ffff888104fcb980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.458380] ==================================================================