Date
July 22, 2025, 2:40 p.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 17.712013] ================================================================== [ 17.712617] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 17.712712] Read of size 4 at addr fff00000c6fcc2c0 by task swapper/0/0 [ 17.712760] [ 17.713108] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G B N 6.15.8-rc1 #1 PREEMPT [ 17.713524] Tainted: [B]=BAD_PAGE, [N]=TEST [ 17.713629] Hardware name: linux,dummy-virt (DT) [ 17.713664] Call trace: [ 17.713692] show_stack+0x20/0x38 (C) [ 17.713747] dump_stack_lvl+0x8c/0xd0 [ 17.713796] print_report+0x118/0x5d0 [ 17.714174] kasan_report+0xdc/0x128 [ 17.714245] __asan_report_load4_noabort+0x20/0x30 [ 17.714307] rcu_uaf_reclaim+0x64/0x70 [ 17.714668] rcu_core+0x9f4/0x1e20 [ 17.714858] rcu_core_si+0x18/0x30 [ 17.715262] handle_softirqs+0x374/0xb28 [ 17.715411] __do_softirq+0x1c/0x28 [ 17.715583] ____do_softirq+0x18/0x30 [ 17.715633] call_on_irq_stack+0x24/0x30 [ 17.716042] do_softirq_own_stack+0x24/0x38 [ 17.716103] __irq_exit_rcu+0x1fc/0x318 [ 17.716321] irq_exit_rcu+0x1c/0x80 [ 17.716516] el1_interrupt+0x38/0x58 [ 17.716579] el1h_64_irq_handler+0x18/0x28 [ 17.716803] el1h_64_irq+0x6c/0x70 [ 17.717296] arch_local_irq_enable+0x4/0x8 (P) [ 17.717767] do_idle+0x384/0x4e8 [ 17.717856] cpu_startup_entry+0x68/0x80 [ 17.718035] rest_init+0x160/0x188 [ 17.718278] start_kernel+0x308/0x3d0 [ 17.718546] __primary_switched+0x8c/0xa0 [ 17.718835] [ 17.718861] Allocated by task 200: [ 17.718894] kasan_save_stack+0x3c/0x68 [ 17.719312] kasan_save_track+0x20/0x40 [ 17.719438] kasan_save_alloc_info+0x40/0x58 [ 17.719497] __kasan_kmalloc+0xd4/0xd8 [ 17.719702] __kmalloc_cache_noprof+0x16c/0x3c0 [ 17.719962] rcu_uaf+0xb0/0x2d8 [ 17.720022] kunit_try_run_case+0x170/0x3f0 [ 17.720246] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 17.720462] kthread+0x328/0x630 [ 17.720566] ret_from_fork+0x10/0x20 [ 17.720743] [ 17.720911] Freed by task 0: [ 17.721061] kasan_save_stack+0x3c/0x68 [ 17.721105] kasan_save_track+0x20/0x40 [ 17.721386] kasan_save_free_info+0x4c/0x78 [ 17.721584] __kasan_slab_free+0x6c/0x98 [ 17.721672] kfree+0x214/0x3c8 [ 17.721750] rcu_uaf_reclaim+0x28/0x70 [ 17.722012] rcu_core+0x9f4/0x1e20 [ 17.722406] rcu_core_si+0x18/0x30 [ 17.722573] handle_softirqs+0x374/0xb28 [ 17.722772] __do_softirq+0x1c/0x28 [ 17.722988] [ 17.723310] Last potentially related work creation: [ 17.723548] kasan_save_stack+0x3c/0x68 [ 17.723662] kasan_record_aux_stack+0xb4/0xc8 [ 17.723983] __call_rcu_common.constprop.0+0x74/0x8c8 [ 17.724274] call_rcu+0x18/0x30 [ 17.724342] rcu_uaf+0x14c/0x2d8 [ 17.724378] kunit_try_run_case+0x170/0x3f0 [ 17.724528] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 17.724575] kthread+0x328/0x630 [ 17.724612] ret_from_fork+0x10/0x20 [ 17.724683] [ 17.724739] The buggy address belongs to the object at fff00000c6fcc2c0 [ 17.724739] which belongs to the cache kmalloc-32 of size 32 [ 17.724832] The buggy address is located 0 bytes inside of [ 17.724832] freed 32-byte region [fff00000c6fcc2c0, fff00000c6fcc2e0) [ 17.724892] [ 17.724913] The buggy address belongs to the physical page: [ 17.724953] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106fcc [ 17.725017] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 17.725085] page_type: f5(slab) [ 17.725126] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 17.725186] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 17.725235] page dumped because: kasan: bad access detected [ 17.725299] [ 17.725325] Memory state around the buggy address: [ 17.725367] fff00000c6fcc180: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 17.725410] fff00000c6fcc200: 00 00 00 fc fc fc fc fc 00 00 05 fc fc fc fc fc [ 17.725474] >fff00000c6fcc280: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 17.725511] ^ [ 17.725544] fff00000c6fcc300: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.725586] fff00000c6fcc380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.725639] ==================================================================
[ 11.671959] ================================================================== [ 11.672882] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 11.673304] Read of size 4 at addr ffff8881028bd240 by task swapper/1/0 [ 11.674000] [ 11.674120] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.15.8-rc1 #1 PREEMPT(voluntary) [ 11.674167] Tainted: [B]=BAD_PAGE, [N]=TEST [ 11.674178] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 11.674200] Call Trace: [ 11.674244] <IRQ> [ 11.674261] dump_stack_lvl+0x73/0xb0 [ 11.674289] print_report+0xd1/0x610 [ 11.674312] ? __virt_addr_valid+0x1db/0x2d0 [ 11.674332] ? rcu_uaf_reclaim+0x50/0x60 [ 11.674352] ? kasan_complete_mode_report_info+0x64/0x200 [ 11.674374] ? rcu_uaf_reclaim+0x50/0x60 [ 11.674394] kasan_report+0x141/0x180 [ 11.674416] ? rcu_uaf_reclaim+0x50/0x60 [ 11.674441] __asan_report_load4_noabort+0x18/0x20 [ 11.674476] rcu_uaf_reclaim+0x50/0x60 [ 11.674507] rcu_core+0x66c/0x1c30 [ 11.674532] ? enqueue_hrtimer+0xfe/0x210 [ 11.674566] ? __pfx_rcu_core+0x10/0x10 [ 11.674588] ? ktime_get+0x6b/0x150 [ 11.674611] ? handle_softirqs+0x18e/0x730 [ 11.674636] rcu_core_si+0x12/0x20 [ 11.674653] handle_softirqs+0x209/0x730 [ 11.674673] ? hrtimer_interrupt+0x2fe/0x780 [ 11.674695] ? __pfx_handle_softirqs+0x10/0x10 [ 11.674721] __irq_exit_rcu+0xc9/0x110 [ 11.674742] irq_exit_rcu+0x12/0x20 [ 11.674759] sysvec_apic_timer_interrupt+0x81/0x90 [ 11.674780] </IRQ> [ 11.674807] <TASK> [ 11.674817] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 11.674904] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 11.675106] 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 03 77 27 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 [ 11.675184] RSP: 0000:ffff88810086fdc8 EFLAGS: 00010216 [ 11.675283] RAX: ffff8881a8b90000 RBX: ffff8881008353c0 RCX: ffffffffb0012fb5 [ 11.675328] RDX: ffffed102b626103 RSI: 0000000000000004 RDI: 000000000001c90c [ 11.675386] RBP: ffff88810086fdd0 R08: 0000000000000001 R09: ffffed102b626102 [ 11.675429] R10: ffff88815b130813 R11: 0000000000000000 R12: 0000000000000001 [ 11.675470] R13: ffffed1020106a78 R14: ffffffffb1d9d310 R15: 0000000000000000 [ 11.675525] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 11.675575] ? default_idle+0xd/0x20 [ 11.675595] arch_cpu_idle+0xd/0x20 [ 11.675613] default_idle_call+0x48/0x80 [ 11.675633] do_idle+0x379/0x4f0 [ 11.675652] ? complete+0x15b/0x1d0 [ 11.675672] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 11.675699] ? __pfx_do_idle+0x10/0x10 [ 11.675717] ? _raw_spin_unlock_irqrestore+0x49/0x90 [ 11.675741] ? complete+0x15b/0x1d0 [ 11.675763] cpu_startup_entry+0x5c/0x70 [ 11.675783] start_secondary+0x211/0x290 [ 11.675803] ? __pfx_start_secondary+0x10/0x10 [ 11.675827] common_startup_64+0x13e/0x148 [ 11.675858] </TASK> [ 11.675869] [ 11.687967] Allocated by task 218: [ 11.688104] kasan_save_stack+0x45/0x70 [ 11.688322] kasan_save_track+0x18/0x40 [ 11.688693] kasan_save_alloc_info+0x3b/0x50 [ 11.688864] __kasan_kmalloc+0xb7/0xc0 [ 11.689049] __kmalloc_cache_noprof+0x189/0x420 [ 11.689283] rcu_uaf+0xb0/0x330 [ 11.689854] kunit_try_run_case+0x1a5/0x480 [ 11.690055] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.690433] kthread+0x337/0x6f0 [ 11.690675] ret_from_fork+0x41/0x80 [ 11.690813] ret_from_fork_asm+0x1a/0x30 [ 11.691124] [ 11.691202] Freed by task 0: [ 11.691332] kasan_save_stack+0x45/0x70 [ 11.691531] kasan_save_track+0x18/0x40 [ 11.691720] kasan_save_free_info+0x3f/0x60 [ 11.691864] __kasan_slab_free+0x56/0x70 [ 11.692062] kfree+0x222/0x3f0 [ 11.692221] rcu_uaf_reclaim+0x1f/0x60 [ 11.692749] rcu_core+0x66c/0x1c30 [ 11.692881] rcu_core_si+0x12/0x20 [ 11.693128] handle_softirqs+0x209/0x730 [ 11.693420] __irq_exit_rcu+0xc9/0x110 [ 11.693650] irq_exit_rcu+0x12/0x20 [ 11.693958] sysvec_apic_timer_interrupt+0x81/0x90 [ 11.694240] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 11.694558] [ 11.694681] Last potentially related work creation: [ 11.694994] kasan_save_stack+0x45/0x70 [ 11.695195] kasan_record_aux_stack+0xb2/0xc0 [ 11.695381] __call_rcu_common.constprop.0+0x7b/0x9e0 [ 11.695583] call_rcu+0x12/0x20 [ 11.695748] rcu_uaf+0x168/0x330 [ 11.695901] kunit_try_run_case+0x1a5/0x480 [ 11.696084] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 11.696755] kthread+0x337/0x6f0 [ 11.696884] ret_from_fork+0x41/0x80 [ 11.697221] ret_from_fork_asm+0x1a/0x30 [ 11.697405] [ 11.697615] The buggy address belongs to the object at ffff8881028bd240 [ 11.697615] which belongs to the cache kmalloc-32 of size 32 [ 11.698257] The buggy address is located 0 bytes inside of [ 11.698257] freed 32-byte region [ffff8881028bd240, ffff8881028bd260) [ 11.698903] [ 11.699102] The buggy address belongs to the physical page: [ 11.699398] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1028bd [ 11.699806] flags: 0x200000000000000(node=0|zone=2) [ 11.700014] page_type: f5(slab) [ 11.700266] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 11.700717] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 11.701109] page dumped because: kasan: bad access detected [ 11.701375] [ 11.701468] Memory state around the buggy address: [ 11.701795] ffff8881028bd100: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 11.702100] ffff8881028bd180: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 11.702579] >ffff8881028bd200: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 11.702887] ^ [ 11.703183] ffff8881028bd280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.703466] ffff8881028bd300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.703886] ==================================================================