Date
July 25, 2025, 3:13 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 32.887476] ================================================================== [ 32.887612] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 32.887703] Read of size 4 at addr fff00000c9b21540 by task swapper/1/0 [ 32.887766] [ 32.887808] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B W N 6.16.0-rc7-next-20250725 #1 PREEMPT [ 32.887901] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST [ 32.887940] Hardware name: linux,dummy-virt (DT) [ 32.887971] Call trace: [ 32.887996] show_stack+0x20/0x38 (C) [ 32.888046] dump_stack_lvl+0x8c/0xd0 [ 32.888094] print_report+0x118/0x5e8 [ 32.888137] kasan_report+0xdc/0x128 [ 32.888180] __asan_report_load4_noabort+0x20/0x30 [ 32.888227] rcu_uaf_reclaim+0x64/0x70 [ 32.888272] rcu_core+0x9f4/0x1e58 [ 32.888317] rcu_core_si+0x18/0x30 [ 32.888361] handle_softirqs+0x374/0xb28 [ 32.888407] __do_softirq+0x1c/0x28 [ 32.888449] ____do_softirq+0x18/0x30 [ 32.888502] call_on_irq_stack+0x30/0x48 [ 32.888547] do_softirq_own_stack+0x24/0x38 [ 32.888593] __irq_exit_rcu+0x1fc/0x318 [ 32.888678] irq_exit_rcu+0x1c/0x80 [ 32.888918] el1_interrupt+0x38/0x58 [ 32.889424] el1h_64_irq_handler+0x18/0x28 [ 32.889690] el1h_64_irq+0x6c/0x70 [ 32.889860] arch_local_irq_enable+0x4/0x8 (P) [ 32.889920] do_idle+0x384/0x4e8 [ 32.890110] cpu_startup_entry+0x64/0x80 [ 32.890222] secondary_start_kernel+0x28c/0x340 [ 32.890277] __secondary_switched+0xc0/0xc8 [ 32.890331] [ 32.890466] Allocated by task 230: [ 32.890507] kasan_save_stack+0x3c/0x68 [ 32.890551] kasan_save_track+0x20/0x40 [ 32.890587] kasan_save_alloc_info+0x40/0x58 [ 32.890624] __kasan_kmalloc+0xd4/0xd8 [ 32.890681] __kmalloc_cache_noprof+0x16c/0x3c0 [ 32.890724] rcu_uaf+0xb0/0x2d8 [ 32.890758] kunit_try_run_case+0x170/0x3f0 [ 32.891209] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 32.891269] kthread+0x328/0x630 [ 32.891305] ret_from_fork+0x10/0x20 [ 32.891341] [ 32.891361] Freed by task 0: [ 32.891591] kasan_save_stack+0x3c/0x68 [ 32.891766] kasan_save_track+0x20/0x40 [ 32.891807] kasan_save_free_info+0x4c/0x78 [ 32.891892] __kasan_slab_free+0x7c/0xa8 [ 32.891932] kfree+0x214/0x3c8 [ 32.891968] rcu_uaf_reclaim+0x28/0x70 [ 32.892012] rcu_core+0x9f4/0x1e58 [ 32.892049] rcu_core_si+0x18/0x30 [ 32.892085] handle_softirqs+0x374/0xb28 [ 32.892271] __do_softirq+0x1c/0x28 [ 32.892446] [ 32.892479] Last potentially related work creation: [ 32.892515] kasan_save_stack+0x3c/0x68 [ 32.892555] kasan_record_aux_stack+0xb4/0xc8 [ 32.892965] __call_rcu_common.constprop.0+0x74/0x8c8 [ 32.893070] call_rcu+0x18/0x30 [ 32.893114] rcu_uaf+0x14c/0x2d8 [ 32.893149] kunit_try_run_case+0x170/0x3f0 [ 32.893312] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 32.893456] kthread+0x328/0x630 [ 32.893491] ret_from_fork+0x10/0x20 [ 32.893633] [ 32.893718] The buggy address belongs to the object at fff00000c9b21540 [ 32.893718] which belongs to the cache kmalloc-32 of size 32 [ 32.893838] The buggy address is located 0 bytes inside of [ 32.893838] freed 32-byte region [fff00000c9b21540, fff00000c9b21560) [ 32.893901] [ 32.893923] The buggy address belongs to the physical page: [ 32.893962] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109b21 [ 32.894068] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 32.894191] page_type: f5(slab) [ 32.894297] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 32.894382] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 32.894454] page dumped because: kasan: bad access detected [ 32.894485] [ 32.894503] Memory state around the buggy address: [ 32.894634] fff00000c9b21400: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 32.895319] fff00000c9b21480: 00 00 00 fc fc fc fc fc 00 00 05 fc fc fc fc fc [ 32.895370] >fff00000c9b21500: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 32.895470] ^ [ 32.895509] fff00000c9b21580: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.895861] fff00000c9b21600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.895929] ==================================================================
[ 26.339063] ================================================================== [ 26.339541] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 26.339838] Read of size 4 at addr ffff888106252900 by task swapper/1/0 [ 26.340433] [ 26.340560] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.16.0-rc7-next-20250725 #1 PREEMPT(voluntary) [ 26.340682] Tainted: [B]=BAD_PAGE, [N]=TEST [ 26.340697] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 26.340718] Call Trace: [ 26.340741] <IRQ> [ 26.340775] dump_stack_lvl+0x73/0xb0 [ 26.340824] print_report+0xd1/0x640 [ 26.340991] ? __virt_addr_valid+0x1db/0x2d0 [ 26.341029] ? rcu_uaf_reclaim+0x50/0x60 [ 26.341062] ? kasan_complete_mode_report_info+0x64/0x200 [ 26.341090] ? rcu_uaf_reclaim+0x50/0x60 [ 26.341112] kasan_report+0x141/0x180 [ 26.341141] ? rcu_uaf_reclaim+0x50/0x60 [ 26.341167] __asan_report_load4_noabort+0x18/0x20 [ 26.341192] rcu_uaf_reclaim+0x50/0x60 [ 26.341214] rcu_core+0x66f/0x1c40 [ 26.341244] ? __pfx_rcu_core+0x10/0x10 [ 26.341267] ? ktime_get+0x6b/0x150 [ 26.341294] rcu_core_si+0x12/0x20 [ 26.341315] handle_softirqs+0x209/0x730 [ 26.341337] ? hrtimer_interrupt+0x2fe/0x780 [ 26.341362] ? __pfx_handle_softirqs+0x10/0x10 [ 26.341388] __irq_exit_rcu+0xc9/0x110 [ 26.341409] irq_exit_rcu+0x12/0x20 [ 26.341429] sysvec_apic_timer_interrupt+0x81/0x90 [ 26.341454] </IRQ> [ 26.341485] <TASK> [ 26.341496] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 26.341587] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 26.341803] 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 e3 14 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 [ 26.341885] RSP: 0000:ffff88810087fdc8 EFLAGS: 00010216 [ 26.341993] RAX: ffff8881a050d000 RBX: ffff88810085b000 RCX: ffffffffb873d965 [ 26.342041] RDX: ffffed102b626193 RSI: 0000000000000004 RDI: 000000000002c11c [ 26.342085] RBP: ffff88810087fdd0 R08: 0000000000000001 R09: ffffed102b626192 [ 26.342127] R10: ffff88815b130c93 R11: ffff88815b1363c8 R12: 0000000000000001 [ 26.342170] R13: ffffed102010b600 R14: ffffffffba3ff4d0 R15: 0000000000000000 [ 26.342227] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 26.342280] ? default_idle+0xd/0x20 [ 26.342302] arch_cpu_idle+0xd/0x20 [ 26.342324] default_idle_call+0x48/0x80 [ 26.342346] do_idle+0x379/0x4f0 [ 26.342373] ? __pfx_do_idle+0x10/0x10 [ 26.342395] ? _raw_spin_unlock_irqrestore+0x49/0x90 [ 26.342422] ? complete+0x15b/0x1d0 [ 26.342450] cpu_startup_entry+0x5c/0x70 [ 26.342474] start_secondary+0x211/0x290 [ 26.342498] ? __pfx_start_secondary+0x10/0x10 [ 26.342526] common_startup_64+0x13e/0x148 [ 26.342560] </TASK> [ 26.342572] [ 26.356518] Allocated by task 247: [ 26.356712] kasan_save_stack+0x45/0x70 [ 26.356920] kasan_save_track+0x18/0x40 [ 26.357383] kasan_save_alloc_info+0x3b/0x50 [ 26.357582] __kasan_kmalloc+0xb7/0xc0 [ 26.357766] __kmalloc_cache_noprof+0x189/0x420 [ 26.358030] rcu_uaf+0xb0/0x330 [ 26.358151] kunit_try_run_case+0x1a5/0x480 [ 26.358298] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 26.358669] kthread+0x337/0x6f0 [ 26.358960] ret_from_fork+0x116/0x1d0 [ 26.359218] ret_from_fork_asm+0x1a/0x30 [ 26.359461] [ 26.359571] Freed by task 0: [ 26.359734] kasan_save_stack+0x45/0x70 [ 26.360056] kasan_save_track+0x18/0x40 [ 26.360284] kasan_save_free_info+0x3f/0x60 [ 26.360432] __kasan_slab_free+0x5e/0x80 [ 26.360569] kfree+0x222/0x3f0 [ 26.360717] rcu_uaf_reclaim+0x1f/0x60 [ 26.361239] rcu_core+0x66f/0x1c40 [ 26.361461] rcu_core_si+0x12/0x20 [ 26.361697] handle_softirqs+0x209/0x730 [ 26.362074] __irq_exit_rcu+0xc9/0x110 [ 26.362291] irq_exit_rcu+0x12/0x20 [ 26.362420] sysvec_apic_timer_interrupt+0x81/0x90 [ 26.362611] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 26.362878] [ 26.363018] Last potentially related work creation: [ 26.363375] kasan_save_stack+0x45/0x70 [ 26.363593] kasan_record_aux_stack+0xb2/0xc0 [ 26.363835] __call_rcu_common.constprop.0+0x7b/0x9e0 [ 26.364112] call_rcu+0x12/0x20 [ 26.364277] rcu_uaf+0x168/0x330 [ 26.364445] kunit_try_run_case+0x1a5/0x480 [ 26.365015] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 26.365297] kthread+0x337/0x6f0 [ 26.365451] ret_from_fork+0x116/0x1d0 [ 26.365637] ret_from_fork_asm+0x1a/0x30 [ 26.365963] [ 26.366072] The buggy address belongs to the object at ffff888106252900 [ 26.366072] which belongs to the cache kmalloc-32 of size 32 [ 26.366614] The buggy address is located 0 bytes inside of [ 26.366614] freed 32-byte region [ffff888106252900, ffff888106252920) [ 26.367197] [ 26.367317] The buggy address belongs to the physical page: [ 26.367580] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106252 [ 26.367935] flags: 0x200000000000000(node=0|zone=2) [ 26.368267] page_type: f5(slab) [ 26.368435] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 26.368689] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 26.369263] page dumped because: kasan: bad access detected [ 26.369523] [ 26.369597] Memory state around the buggy address: [ 26.369932] ffff888106252800: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 26.370292] ffff888106252880: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 26.370613] >ffff888106252900: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 26.370994] ^ [ 26.371157] ffff888106252980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.371496] ffff888106252a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.371883] ==================================================================