Date
June 25, 2025, 8:08 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 27.198597] ================================================================== [ 27.198746] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 27.198818] Read of size 4 at addr fff00000c7894c80 by task swapper/1/0 [ 27.198865] [ 27.198906] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.16.0-rc3-next-20250625 #1 PREEMPT [ 27.198992] Tainted: [B]=BAD_PAGE, [N]=TEST [ 27.199018] Hardware name: linux,dummy-virt (DT) [ 27.199052] Call trace: [ 27.199074] show_stack+0x20/0x38 (C) [ 27.199124] dump_stack_lvl+0x8c/0xd0 [ 27.199172] print_report+0x118/0x608 [ 27.199218] kasan_report+0xdc/0x128 [ 27.199261] __asan_report_load4_noabort+0x20/0x30 [ 27.199308] rcu_uaf_reclaim+0x64/0x70 [ 27.199351] rcu_core+0x9f4/0x1e20 [ 27.199405] rcu_core_si+0x18/0x30 [ 27.199449] handle_softirqs+0x374/0xb28 [ 27.199495] __do_softirq+0x1c/0x28 [ 27.199537] ____do_softirq+0x18/0x30 [ 27.199579] call_on_irq_stack+0x24/0x30 [ 27.199624] do_softirq_own_stack+0x24/0x38 [ 27.199668] __irq_exit_rcu+0x1fc/0x318 [ 27.199711] irq_exit_rcu+0x1c/0x80 [ 27.199754] el1_interrupt+0x38/0x58 [ 27.199800] el1h_64_irq_handler+0x18/0x28 [ 27.199883] el1h_64_irq+0x6c/0x70 [ 27.200570] arch_local_irq_enable+0x4/0x8 (P) [ 27.200664] do_idle+0x384/0x4e8 [ 27.200913] cpu_startup_entry+0x68/0x80 [ 27.201097] secondary_start_kernel+0x288/0x340 [ 27.201208] __secondary_switched+0xc0/0xc8 [ 27.201473] [ 27.201689] Allocated by task 210: [ 27.201771] kasan_save_stack+0x3c/0x68 [ 27.201911] kasan_save_track+0x20/0x40 [ 27.201994] kasan_save_alloc_info+0x40/0x58 [ 27.202091] __kasan_kmalloc+0xd4/0xd8 [ 27.202184] __kmalloc_cache_noprof+0x16c/0x3c0 [ 27.202467] rcu_uaf+0xb0/0x2d8 [ 27.202652] kunit_try_run_case+0x170/0x3f0 [ 27.202744] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 27.202790] kthread+0x328/0x630 [ 27.203019] ret_from_fork+0x10/0x20 [ 27.203163] [ 27.203239] Freed by task 0: [ 27.203276] kasan_save_stack+0x3c/0x68 [ 27.203327] kasan_save_track+0x20/0x40 [ 27.203363] kasan_save_free_info+0x4c/0x78 [ 27.203412] __kasan_slab_free+0x6c/0x98 [ 27.203460] kfree+0x214/0x3c8 [ 27.203509] rcu_uaf_reclaim+0x28/0x70 [ 27.203546] rcu_core+0x9f4/0x1e20 [ 27.203589] rcu_core_si+0x18/0x30 [ 27.203632] handle_softirqs+0x374/0xb28 [ 27.203673] __do_softirq+0x1c/0x28 [ 27.203713] [ 27.203745] Last potentially related work creation: [ 27.203796] kasan_save_stack+0x3c/0x68 [ 27.203837] kasan_record_aux_stack+0xb4/0xc8 [ 27.203902] __call_rcu_common.constprop.0+0x74/0x8c8 [ 27.203945] call_rcu+0x18/0x30 [ 27.203977] rcu_uaf+0x14c/0x2d8 [ 27.204012] kunit_try_run_case+0x170/0x3f0 [ 27.204185] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 27.204239] kthread+0x328/0x630 [ 27.204270] ret_from_fork+0x10/0x20 [ 27.204315] [ 27.204345] The buggy address belongs to the object at fff00000c7894c80 [ 27.204345] which belongs to the cache kmalloc-32 of size 32 [ 27.204416] The buggy address is located 0 bytes inside of [ 27.204416] freed 32-byte region [fff00000c7894c80, fff00000c7894ca0) [ 27.204478] [ 27.204848] The buggy address belongs to the physical page: [ 27.204932] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107894 [ 27.205042] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 27.205095] page_type: f5(slab) [ 27.205160] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 27.205503] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 27.205580] page dumped because: kasan: bad access detected [ 27.205823] [ 27.206013] Memory state around the buggy address: [ 27.206052] fff00000c7894b80: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 27.206405] fff00000c7894c00: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 27.206656] >fff00000c7894c80: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 27.206720] ^ [ 27.206750] fff00000c7894d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.206979] fff00000c7894d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.207217] ==================================================================
[ 22.436924] ================================================================== [ 22.437355] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 22.437689] Read of size 4 at addr ffff88810258c800 by task swapper/0/0 [ 22.438039] [ 22.438128] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G B N 6.16.0-rc3-next-20250625 #1 PREEMPT(voluntary) [ 22.438175] Tainted: [B]=BAD_PAGE, [N]=TEST [ 22.438187] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 22.438207] Call Trace: [ 22.438234] <IRQ> [ 22.438251] dump_stack_lvl+0x73/0xb0 [ 22.438280] print_report+0xd1/0x650 [ 22.438300] ? __virt_addr_valid+0x1db/0x2d0 [ 22.438324] ? rcu_uaf_reclaim+0x50/0x60 [ 22.438343] ? kasan_complete_mode_report_info+0x64/0x200 [ 22.438367] ? rcu_uaf_reclaim+0x50/0x60 [ 22.438386] kasan_report+0x141/0x180 [ 22.438406] ? rcu_uaf_reclaim+0x50/0x60 [ 22.438429] __asan_report_load4_noabort+0x18/0x20 [ 22.438452] rcu_uaf_reclaim+0x50/0x60 [ 22.438519] rcu_core+0x66f/0x1c40 [ 22.438548] ? __pfx_rcu_core+0x10/0x10 [ 22.438569] ? ktime_get+0x6b/0x150 [ 22.438602] ? handle_softirqs+0x18e/0x730 [ 22.438627] rcu_core_si+0x12/0x20 [ 22.438646] handle_softirqs+0x209/0x730 [ 22.438666] ? hrtimer_interrupt+0x2fe/0x780 [ 22.438687] ? __pfx_handle_softirqs+0x10/0x10 [ 22.438710] __irq_exit_rcu+0xc9/0x110 [ 22.438729] irq_exit_rcu+0x12/0x20 [ 22.438748] sysvec_apic_timer_interrupt+0x81/0x90 [ 22.438769] </IRQ> [ 22.438795] <TASK> [ 22.438806] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 22.438946] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 22.439153] 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 bf 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 [ 22.439231] RSP: 0000:ffffffffb1e07dd8 EFLAGS: 00010216 [ 22.439318] RAX: ffff8881a7e2e000 RBX: ffffffffb1e1cac0 RCX: ffffffffb0cef165 [ 22.439362] RDX: ffffed102b606193 RSI: 0000000000000004 RDI: 00000000000d84cc [ 22.439404] RBP: ffffffffb1e07de0 R08: 0000000000000001 R09: ffffed102b606192 [ 22.439446] R10: ffff88815b030c93 R11: 000000000000d400 R12: 0000000000000000 [ 22.439488] R13: fffffbfff63c3958 R14: ffffffffb29eacd0 R15: 0000000000000000 [ 22.439542] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 22.439590] ? default_idle+0xd/0x20 [ 22.439609] arch_cpu_idle+0xd/0x20 [ 22.439628] default_idle_call+0x48/0x80 [ 22.439647] do_idle+0x379/0x4f0 [ 22.439672] ? __pfx_do_idle+0x10/0x10 [ 22.439698] cpu_startup_entry+0x5c/0x70 [ 22.439720] rest_init+0x11a/0x140 [ 22.439739] ? acpi_subsystem_init+0x5d/0x150 [ 22.439763] start_kernel+0x352/0x400 [ 22.439785] x86_64_start_reservations+0x1c/0x30 [ 22.439869] x86_64_start_kernel+0x10d/0x120 [ 22.439899] common_startup_64+0x13e/0x148 [ 22.439932] </TASK> [ 22.439956] [ 22.453196] Allocated by task 227: [ 22.453514] kasan_save_stack+0x45/0x70 [ 22.453715] kasan_save_track+0x18/0x40 [ 22.453978] kasan_save_alloc_info+0x3b/0x50 [ 22.454167] __kasan_kmalloc+0xb7/0xc0 [ 22.454597] __kmalloc_cache_noprof+0x189/0x420 [ 22.454772] rcu_uaf+0xb0/0x330 [ 22.455156] kunit_try_run_case+0x1a5/0x480 [ 22.455499] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.455689] kthread+0x337/0x6f0 [ 22.455935] ret_from_fork+0x116/0x1d0 [ 22.456292] ret_from_fork_asm+0x1a/0x30 [ 22.456531] [ 22.456617] Freed by task 0: [ 22.456755] kasan_save_stack+0x45/0x70 [ 22.457211] kasan_save_track+0x18/0x40 [ 22.457395] kasan_save_free_info+0x3f/0x60 [ 22.457672] __kasan_slab_free+0x56/0x70 [ 22.457960] kfree+0x222/0x3f0 [ 22.458098] rcu_uaf_reclaim+0x1f/0x60 [ 22.458249] rcu_core+0x66f/0x1c40 [ 22.458403] rcu_core_si+0x12/0x20 [ 22.458554] handle_softirqs+0x209/0x730 [ 22.458711] __irq_exit_rcu+0xc9/0x110 [ 22.459211] irq_exit_rcu+0x12/0x20 [ 22.459427] sysvec_apic_timer_interrupt+0x81/0x90 [ 22.459770] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 22.460140] [ 22.460268] Last potentially related work creation: [ 22.460479] kasan_save_stack+0x45/0x70 [ 22.460648] kasan_record_aux_stack+0xb2/0xc0 [ 22.460918] __call_rcu_common.constprop.0+0x7b/0x9e0 [ 22.461171] call_rcu+0x12/0x20 [ 22.461308] rcu_uaf+0x168/0x330 [ 22.461460] kunit_try_run_case+0x1a5/0x480 [ 22.461673] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.462014] kthread+0x337/0x6f0 [ 22.462546] ret_from_fork+0x116/0x1d0 [ 22.462726] ret_from_fork_asm+0x1a/0x30 [ 22.463068] [ 22.463149] The buggy address belongs to the object at ffff88810258c800 [ 22.463149] which belongs to the cache kmalloc-32 of size 32 [ 22.463660] The buggy address is located 0 bytes inside of [ 22.463660] freed 32-byte region [ffff88810258c800, ffff88810258c820) [ 22.464227] [ 22.464376] The buggy address belongs to the physical page: [ 22.464665] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10258c [ 22.465107] flags: 0x200000000000000(node=0|zone=2) [ 22.465359] page_type: f5(slab) [ 22.465543] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 22.465972] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 22.466416] page dumped because: kasan: bad access detected [ 22.466671] [ 22.466751] Memory state around the buggy address: [ 22.466973] ffff88810258c700: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 22.467281] ffff88810258c780: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 22.467851] >ffff88810258c800: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 22.468497] ^ [ 22.468644] ffff88810258c880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.469403] ffff88810258c900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.469797] ==================================================================