Date
July 17, 2025, 11:11 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 16.968800] ================================================================== [ 16.969557] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 16.969648] Read of size 4 at addr fff00000c7859c00 by task swapper/1/0 [ 16.969696] [ 16.969858] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.16.0-rc6 #1 PREEMPT [ 16.969964] Tainted: [B]=BAD_PAGE, [N]=TEST [ 16.969990] Hardware name: linux,dummy-virt (DT) [ 16.970156] Call trace: [ 16.970534] show_stack+0x20/0x38 (C) [ 16.970632] dump_stack_lvl+0x8c/0xd0 [ 16.970939] print_report+0x118/0x5d0 [ 16.971007] kasan_report+0xdc/0x128 [ 16.971079] __asan_report_load4_noabort+0x20/0x30 [ 16.971266] rcu_uaf_reclaim+0x64/0x70 [ 16.971533] rcu_core+0x9f4/0x1e20 [ 16.971605] rcu_core_si+0x18/0x30 [ 16.971649] handle_softirqs+0x374/0xb28 [ 16.971994] __do_softirq+0x1c/0x28 [ 16.972060] ____do_softirq+0x18/0x30 [ 16.972284] call_on_irq_stack+0x24/0x30 [ 16.972577] do_softirq_own_stack+0x24/0x38 [ 16.972732] __irq_exit_rcu+0x1fc/0x318 [ 16.972947] irq_exit_rcu+0x1c/0x80 [ 16.973072] el1_interrupt+0x38/0x58 [ 16.973252] el1h_64_irq_handler+0x18/0x28 [ 16.973364] el1h_64_irq+0x6c/0x70 [ 16.973486] finish_task_switch.isra.0+0x120/0x5e8 (P) [ 16.973542] __schedule+0xab4/0x2840 [ 16.973604] schedule_idle+0x60/0xa8 [ 16.973668] do_idle+0x2c4/0x4e8 [ 16.973711] cpu_startup_entry+0x68/0x80 [ 16.973757] secondary_start_kernel+0x288/0x340 [ 16.973803] __secondary_switched+0xc0/0xc8 [ 16.973856] [ 16.973887] Allocated by task 198: [ 16.974141] kasan_save_stack+0x3c/0x68 [ 16.974592] kasan_save_track+0x20/0x40 [ 16.974663] kasan_save_alloc_info+0x40/0x58 [ 16.974740] __kasan_kmalloc+0xd4/0xd8 [ 16.974961] __kmalloc_cache_noprof+0x16c/0x3c0 [ 16.975187] rcu_uaf+0xb0/0x2d8 [ 16.975425] kunit_try_run_case+0x170/0x3f0 [ 16.975606] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.975755] kthread+0x328/0x630 [ 16.975977] ret_from_fork+0x10/0x20 [ 16.976197] [ 16.976223] Freed by task 0: [ 16.976251] kasan_save_stack+0x3c/0x68 [ 16.976295] kasan_save_track+0x20/0x40 [ 16.976340] kasan_save_free_info+0x4c/0x78 [ 16.976811] __kasan_slab_free+0x6c/0x98 [ 16.977373] kfree+0x214/0x3c8 [ 16.977601] rcu_uaf_reclaim+0x28/0x70 [ 16.977695] rcu_core+0x9f4/0x1e20 [ 16.977921] rcu_core_si+0x18/0x30 [ 16.978074] handle_softirqs+0x374/0xb28 [ 16.978258] __do_softirq+0x1c/0x28 [ 16.978297] [ 16.978395] Last potentially related work creation: [ 16.978609] kasan_save_stack+0x3c/0x68 [ 16.979079] kasan_record_aux_stack+0xb4/0xc8 [ 16.979227] __call_rcu_common.constprop.0+0x74/0x8c8 [ 16.979321] call_rcu+0x18/0x30 [ 16.979702] rcu_uaf+0x14c/0x2d8 [ 16.979917] kunit_try_run_case+0x170/0x3f0 [ 16.980198] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 16.980272] kthread+0x328/0x630 [ 16.980305] ret_from_fork+0x10/0x20 [ 16.980716] [ 16.981009] The buggy address belongs to the object at fff00000c7859c00 [ 16.981009] which belongs to the cache kmalloc-32 of size 32 [ 16.981172] The buggy address is located 0 bytes inside of [ 16.981172] freed 32-byte region [fff00000c7859c00, fff00000c7859c20) [ 16.981303] [ 16.981327] The buggy address belongs to the physical page: [ 16.981679] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107859 [ 16.981840] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 16.982015] page_type: f5(slab) [ 16.982242] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 16.982737] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 16.982880] page dumped because: kasan: bad access detected [ 16.982963] [ 16.983332] Memory state around the buggy address: [ 16.983588] fff00000c7859b00: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 16.983644] fff00000c7859b80: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 16.983770] >fff00000c7859c00: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 16.983810] ^ [ 16.983974] fff00000c7859c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.984223] fff00000c7859d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.984327] ==================================================================
[ 12.854028] ================================================================== [ 12.854494] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 12.854845] Read of size 4 at addr ffff888102f45600 by task swapper/0/0 [ 12.855124] [ 12.855242] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G B N 6.16.0-rc6 #1 PREEMPT(voluntary) [ 12.855297] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.855308] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.855330] Call Trace: [ 12.855359] <IRQ> [ 12.855389] dump_stack_lvl+0x73/0xb0 [ 12.855420] print_report+0xd1/0x610 [ 12.855442] ? __virt_addr_valid+0x1db/0x2d0 [ 12.855465] ? rcu_uaf_reclaim+0x50/0x60 [ 12.855484] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.855507] ? rcu_uaf_reclaim+0x50/0x60 [ 12.855527] kasan_report+0x141/0x180 [ 12.855548] ? rcu_uaf_reclaim+0x50/0x60 [ 12.855583] __asan_report_load4_noabort+0x18/0x20 [ 12.855618] rcu_uaf_reclaim+0x50/0x60 [ 12.855639] rcu_core+0x66f/0x1c40 [ 12.855679] ? __pfx_rcu_core+0x10/0x10 [ 12.855700] ? ktime_get+0x6b/0x150 [ 12.855721] ? handle_softirqs+0x18e/0x730 [ 12.855746] rcu_core_si+0x12/0x20 [ 12.855765] handle_softirqs+0x209/0x730 [ 12.855784] ? hrtimer_interrupt+0x2fe/0x780 [ 12.855807] ? __pfx_handle_softirqs+0x10/0x10 [ 12.855832] __irq_exit_rcu+0xc9/0x110 [ 12.855861] irq_exit_rcu+0x12/0x20 [ 12.855880] sysvec_apic_timer_interrupt+0x81/0x90 [ 12.855905] </IRQ> [ 12.855947] <TASK> [ 12.855958] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 12.856065] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 12.856285] 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 23 62 21 00 fb f4 <e9> 3c 1d 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 [ 12.856366] RSP: 0000:ffffffff9d007dd8 EFLAGS: 00010206 [ 12.856450] RAX: ffff8881bcc72000 RBX: ffffffff9d01cac0 RCX: ffffffff9be76125 [ 12.856495] RDX: ffffed102b60618b RSI: 0000000000000004 RDI: 0000000000012bc4 [ 12.856537] RBP: ffffffff9d007de0 R08: 0000000000000001 R09: ffffed102b60618a [ 12.856578] R10: ffff88815b030c53 R11: ffffffff9e3c36c0 R12: 0000000000000000 [ 12.856634] R13: fffffbfff3a03958 R14: ffffffff9dbb1490 R15: 0000000000000000 [ 12.856692] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 12.856747] ? default_idle+0xd/0x20 [ 12.856769] arch_cpu_idle+0xd/0x20 [ 12.856790] default_idle_call+0x48/0x80 [ 12.856808] do_idle+0x379/0x4f0 [ 12.856834] ? __pfx_do_idle+0x10/0x10 [ 12.856862] cpu_startup_entry+0x5c/0x70 [ 12.856882] rest_init+0x11a/0x140 [ 12.856899] ? acpi_subsystem_init+0x5d/0x150 [ 12.856924] start_kernel+0x330/0x410 [ 12.856949] x86_64_start_reservations+0x1c/0x30 [ 12.856974] x86_64_start_kernel+0x10d/0x120 [ 12.856997] common_startup_64+0x13e/0x148 [ 12.857031] </TASK> [ 12.857041] [ 12.870654] Allocated by task 215: [ 12.870805] kasan_save_stack+0x45/0x70 [ 12.871164] kasan_save_track+0x18/0x40 [ 12.871425] kasan_save_alloc_info+0x3b/0x50 [ 12.871587] __kasan_kmalloc+0xb7/0xc0 [ 12.871909] __kmalloc_cache_noprof+0x189/0x420 [ 12.872140] rcu_uaf+0xb0/0x330 [ 12.872289] kunit_try_run_case+0x1a5/0x480 [ 12.872482] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.872914] kthread+0x337/0x6f0 [ 12.873090] ret_from_fork+0x116/0x1d0 [ 12.873342] ret_from_fork_asm+0x1a/0x30 [ 12.873626] [ 12.873738] Freed by task 0: [ 12.873868] kasan_save_stack+0x45/0x70 [ 12.874204] kasan_save_track+0x18/0x40 [ 12.874395] kasan_save_free_info+0x3f/0x60 [ 12.874581] __kasan_slab_free+0x56/0x70 [ 12.874859] kfree+0x222/0x3f0 [ 12.875015] rcu_uaf_reclaim+0x1f/0x60 [ 12.875199] rcu_core+0x66f/0x1c40 [ 12.875363] rcu_core_si+0x12/0x20 [ 12.875517] handle_softirqs+0x209/0x730 [ 12.876026] __irq_exit_rcu+0xc9/0x110 [ 12.876221] irq_exit_rcu+0x12/0x20 [ 12.876351] sysvec_apic_timer_interrupt+0x81/0x90 [ 12.876695] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 12.877032] [ 12.877168] Last potentially related work creation: [ 12.877508] kasan_save_stack+0x45/0x70 [ 12.877759] kasan_record_aux_stack+0xb2/0xc0 [ 12.878083] __call_rcu_common.constprop.0+0x7b/0x9e0 [ 12.878332] call_rcu+0x12/0x20 [ 12.878595] rcu_uaf+0x168/0x330 [ 12.878836] kunit_try_run_case+0x1a5/0x480 [ 12.879176] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.879493] kthread+0x337/0x6f0 [ 12.879686] ret_from_fork+0x116/0x1d0 [ 12.879846] ret_from_fork_asm+0x1a/0x30 [ 12.880033] [ 12.880155] The buggy address belongs to the object at ffff888102f45600 [ 12.880155] which belongs to the cache kmalloc-32 of size 32 [ 12.880966] The buggy address is located 0 bytes inside of [ 12.880966] freed 32-byte region [ffff888102f45600, ffff888102f45620) [ 12.881439] [ 12.881666] The buggy address belongs to the physical page: [ 12.881872] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102f45 [ 12.882369] flags: 0x200000000000000(node=0|zone=2) [ 12.882719] page_type: f5(slab) [ 12.882869] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 12.883353] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 12.883687] page dumped because: kasan: bad access detected [ 12.883983] [ 12.884097] Memory state around the buggy address: [ 12.884295] ffff888102f45500: 00 00 00 fc fc fc fc fc 00 00 05 fc fc fc fc fc [ 12.884597] ffff888102f45580: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 12.885140] >ffff888102f45600: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 12.885485] ^ [ 12.885674] ffff888102f45680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.886227] ffff888102f45700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.886662] ==================================================================