Date
July 19, 2025, 11:11 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 15.719182] ================================================================== [ 15.719323] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 15.719390] Read of size 4 at addr fff00000c6e662c0 by task swapper/1/0 [ 15.719437] [ 15.719478] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.16.0-rc6 #1 PREEMPT [ 15.719574] Tainted: [B]=BAD_PAGE, [N]=TEST [ 15.719600] Hardware name: linux,dummy-virt (DT) [ 15.719661] Call trace: [ 15.719693] show_stack+0x20/0x38 (C) [ 15.719821] dump_stack_lvl+0x8c/0xd0 [ 15.719870] print_report+0x118/0x5d0 [ 15.719916] kasan_report+0xdc/0x128 [ 15.719962] __asan_report_load4_noabort+0x20/0x30 [ 15.720011] rcu_uaf_reclaim+0x64/0x70 [ 15.720060] rcu_core+0x9f4/0x1e20 [ 15.720315] rcu_core_si+0x18/0x30 [ 15.720545] handle_softirqs+0x374/0xb28 [ 15.720643] __do_softirq+0x1c/0x28 [ 15.720866] ____do_softirq+0x18/0x30 [ 15.720913] call_on_irq_stack+0x24/0x30 [ 15.720963] do_softirq_own_stack+0x24/0x38 [ 15.721147] __irq_exit_rcu+0x1fc/0x318 [ 15.721205] irq_exit_rcu+0x1c/0x80 [ 15.721409] el1_interrupt+0x38/0x58 [ 15.721463] el1h_64_irq_handler+0x18/0x28 [ 15.722036] el1h_64_irq+0x6c/0x70 [ 15.722470] arch_local_irq_enable+0x4/0x8 (P) [ 15.722550] do_idle+0x384/0x4e8 [ 15.722696] cpu_startup_entry+0x64/0x80 [ 15.722921] secondary_start_kernel+0x288/0x340 [ 15.723005] __secondary_switched+0xc0/0xc8 [ 15.723061] [ 15.723079] Allocated by task 199: [ 15.723115] kasan_save_stack+0x3c/0x68 [ 15.723184] kasan_save_track+0x20/0x40 [ 15.723324] kasan_save_alloc_info+0x40/0x58 [ 15.723522] __kasan_kmalloc+0xd4/0xd8 [ 15.723681] __kmalloc_cache_noprof+0x16c/0x3c0 [ 15.723759] rcu_uaf+0xb0/0x2d8 [ 15.723843] kunit_try_run_case+0x170/0x3f0 [ 15.723964] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.724010] kthread+0x328/0x630 [ 15.724065] ret_from_fork+0x10/0x20 [ 15.724252] [ 15.724321] Freed by task 0: [ 15.724347] kasan_save_stack+0x3c/0x68 [ 15.724385] kasan_save_track+0x20/0x40 [ 15.724422] kasan_save_free_info+0x4c/0x78 [ 15.724460] __kasan_slab_free+0x6c/0x98 [ 15.724518] kfree+0x214/0x3c8 [ 15.725232] rcu_uaf_reclaim+0x28/0x70 [ 15.725721] rcu_core+0x9f4/0x1e20 [ 15.726010] rcu_core_si+0x18/0x30 [ 15.726053] handle_softirqs+0x374/0xb28 [ 15.726091] __do_softirq+0x1c/0x28 [ 15.726363] [ 15.726494] Last potentially related work creation: [ 15.726543] kasan_save_stack+0x3c/0x68 [ 15.726589] kasan_record_aux_stack+0xb4/0xc8 [ 15.726631] __call_rcu_common.constprop.0+0x74/0x8c8 [ 15.726685] call_rcu+0x18/0x30 [ 15.726765] rcu_uaf+0x14c/0x2d8 [ 15.726800] kunit_try_run_case+0x170/0x3f0 [ 15.726860] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 15.726904] kthread+0x328/0x630 [ 15.726936] ret_from_fork+0x10/0x20 [ 15.727208] [ 15.727240] The buggy address belongs to the object at fff00000c6e662c0 [ 15.727240] which belongs to the cache kmalloc-32 of size 32 [ 15.727561] The buggy address is located 0 bytes inside of [ 15.727561] freed 32-byte region [fff00000c6e662c0, fff00000c6e662e0) [ 15.727809] [ 15.727856] The buggy address belongs to the physical page: [ 15.727894] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106e66 [ 15.728129] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 15.728321] page_type: f5(slab) [ 15.728364] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 15.728444] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 15.728484] page dumped because: kasan: bad access detected [ 15.728516] [ 15.728629] Memory state around the buggy address: [ 15.728863] fff00000c6e66180: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 15.728915] fff00000c6e66200: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 15.728958] >fff00000c6e66280: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 15.728996] ^ [ 15.729117] fff00000c6e66300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.729381] fff00000c6e66380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.729424] ==================================================================
[ 12.606158] ================================================================== [ 12.606645] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 12.606987] Read of size 4 at addr ffff888102f63940 by task swapper/1/0 [ 12.607265] [ 12.607368] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.16.0-rc6 #1 PREEMPT(voluntary) [ 12.607472] Tainted: [B]=BAD_PAGE, [N]=TEST [ 12.607484] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.607517] Call Trace: [ 12.607544] <IRQ> [ 12.607562] dump_stack_lvl+0x73/0xb0 [ 12.607595] print_report+0xd1/0x610 [ 12.607655] ? __virt_addr_valid+0x1db/0x2d0 [ 12.607706] ? rcu_uaf_reclaim+0x50/0x60 [ 12.607725] ? kasan_complete_mode_report_info+0x64/0x200 [ 12.607747] ? rcu_uaf_reclaim+0x50/0x60 [ 12.607767] kasan_report+0x141/0x180 [ 12.607788] ? rcu_uaf_reclaim+0x50/0x60 [ 12.607812] __asan_report_load4_noabort+0x18/0x20 [ 12.607835] rcu_uaf_reclaim+0x50/0x60 [ 12.607855] rcu_core+0x66f/0x1c40 [ 12.607883] ? __pfx_rcu_core+0x10/0x10 [ 12.607903] ? ktime_get+0x6b/0x150 [ 12.607924] ? handle_softirqs+0x18e/0x730 [ 12.607949] rcu_core_si+0x12/0x20 [ 12.607968] handle_softirqs+0x209/0x730 [ 12.607987] ? hrtimer_interrupt+0x2fe/0x780 [ 12.608008] ? __pfx_handle_softirqs+0x10/0x10 [ 12.608033] __irq_exit_rcu+0xc9/0x110 [ 12.608053] irq_exit_rcu+0x12/0x20 [ 12.608072] sysvec_apic_timer_interrupt+0x81/0x90 [ 12.608096] </IRQ> [ 12.608121] <TASK> [ 12.608131] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 12.608301] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 12.608533] 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 [ 12.608616] RSP: 0000:ffff888100877dc8 EFLAGS: 00010202 [ 12.608703] RAX: ffff88819e772000 RBX: ffff888100853000 RCX: ffffffffba476125 [ 12.608747] RDX: ffffed102b62618b RSI: 0000000000000004 RDI: 000000000000e714 [ 12.608788] RBP: ffff888100877dd0 R08: 0000000000000001 R09: ffffed102b62618a [ 12.608829] R10: ffff88815b130c53 R11: 0000000000000000 R12: 0000000000000001 [ 12.608873] R13: ffffed102010a600 R14: ffffffffbc1b1490 R15: 0000000000000000 [ 12.608934] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 12.608986] ? default_idle+0xd/0x20 [ 12.609007] arch_cpu_idle+0xd/0x20 [ 12.609028] default_idle_call+0x48/0x80 [ 12.609047] do_idle+0x379/0x4f0 [ 12.609072] ? __pfx_do_idle+0x10/0x10 [ 12.609099] cpu_startup_entry+0x5c/0x70 [ 12.609118] start_secondary+0x211/0x290 [ 12.609139] ? __pfx_start_secondary+0x10/0x10 [ 12.609164] common_startup_64+0x13e/0x148 [ 12.609195] </TASK> [ 12.609205] [ 12.623787] Allocated by task 216: [ 12.624099] kasan_save_stack+0x45/0x70 [ 12.624429] kasan_save_track+0x18/0x40 [ 12.624867] kasan_save_alloc_info+0x3b/0x50 [ 12.625285] __kasan_kmalloc+0xb7/0xc0 [ 12.625484] __kmalloc_cache_noprof+0x189/0x420 [ 12.625673] rcu_uaf+0xb0/0x330 [ 12.625859] kunit_try_run_case+0x1a5/0x480 [ 12.626048] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.626359] kthread+0x337/0x6f0 [ 12.626533] ret_from_fork+0x116/0x1d0 [ 12.626735] ret_from_fork_asm+0x1a/0x30 [ 12.626882] [ 12.626978] Freed by task 0: [ 12.627217] kasan_save_stack+0x45/0x70 [ 12.627399] kasan_save_track+0x18/0x40 [ 12.627603] kasan_save_free_info+0x3f/0x60 [ 12.627814] __kasan_slab_free+0x56/0x70 [ 12.628001] kfree+0x222/0x3f0 [ 12.628157] rcu_uaf_reclaim+0x1f/0x60 [ 12.628442] rcu_core+0x66f/0x1c40 [ 12.628651] rcu_core_si+0x12/0x20 [ 12.628859] handle_softirqs+0x209/0x730 [ 12.629218] __irq_exit_rcu+0xc9/0x110 [ 12.629415] irq_exit_rcu+0x12/0x20 [ 12.629619] sysvec_apic_timer_interrupt+0x81/0x90 [ 12.629860] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 12.630146] [ 12.630311] Last potentially related work creation: [ 12.630550] kasan_save_stack+0x45/0x70 [ 12.630752] kasan_record_aux_stack+0xb2/0xc0 [ 12.630979] __call_rcu_common.constprop.0+0x7b/0x9e0 [ 12.631363] call_rcu+0x12/0x20 [ 12.631523] rcu_uaf+0x168/0x330 [ 12.631716] kunit_try_run_case+0x1a5/0x480 [ 12.631913] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 12.632150] kthread+0x337/0x6f0 [ 12.632266] ret_from_fork+0x116/0x1d0 [ 12.632394] ret_from_fork_asm+0x1a/0x30 [ 12.632552] [ 12.632661] The buggy address belongs to the object at ffff888102f63940 [ 12.632661] which belongs to the cache kmalloc-32 of size 32 [ 12.633386] The buggy address is located 0 bytes inside of [ 12.633386] freed 32-byte region [ffff888102f63940, ffff888102f63960) [ 12.633861] [ 12.633958] The buggy address belongs to the physical page: [ 12.634387] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102f63 [ 12.634810] flags: 0x200000000000000(node=0|zone=2) [ 12.635042] page_type: f5(slab) [ 12.635163] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 12.635576] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 12.635841] page dumped because: kasan: bad access detected [ 12.636015] [ 12.636105] Memory state around the buggy address: [ 12.636326] ffff888102f63800: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc [ 12.636877] ffff888102f63880: 00 00 00 fc fc fc fc fc 00 00 05 fc fc fc fc fc [ 12.637566] >ffff888102f63900: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 12.638168] ^ [ 12.639036] ffff888102f63980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.639284] ffff888102f63a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.639769] ==================================================================