Date
June 23, 2025, 7:07 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 33.593901] ================================================================== [ 33.595404] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x64/0x70 [ 33.595654] Read of size 4 at addr fff00000c57bf400 by task swapper/1/0 [ 33.596826] [ 33.596957] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.16.0-rc3-next-20250623 #1 PREEMPT [ 33.597177] Tainted: [B]=BAD_PAGE, [N]=TEST [ 33.597240] Hardware name: linux,dummy-virt (DT) [ 33.599406] Call trace: [ 33.599721] show_stack+0x20/0x38 (C) [ 33.599968] dump_stack_lvl+0x8c/0xd0 [ 33.601254] print_report+0x118/0x608 [ 33.601386] kasan_report+0xdc/0x128 [ 33.601500] __asan_report_load4_noabort+0x20/0x30 [ 33.601617] rcu_uaf_reclaim+0x64/0x70 [ 33.601733] rcu_core+0x9f4/0x1e20 [ 33.601844] rcu_core_si+0x18/0x30 [ 33.601951] handle_softirqs+0x374/0xb28 [ 33.605128] __do_softirq+0x1c/0x28 [ 33.605264] ____do_softirq+0x18/0x30 [ 33.605392] call_on_irq_stack+0x24/0x30 [ 33.605522] do_softirq_own_stack+0x24/0x38 [ 33.605658] __irq_exit_rcu+0x1fc/0x318 [ 33.605784] irq_exit_rcu+0x1c/0x80 [ 33.605911] el1_interrupt+0x38/0x58 [ 33.605977] el1h_64_irq_handler+0x18/0x28 [ 33.606067] el1h_64_irq+0x6c/0x70 [ 33.606191] tick_nohz_idle_enter+0x12c/0x1a8 (P) [ 33.606263] do_idle+0xac/0x4e8 [ 33.606319] cpu_startup_entry+0x64/0x80 [ 33.606373] secondary_start_kernel+0x288/0x340 [ 33.606429] __secondary_switched+0xc0/0xc8 [ 33.606496] [ 33.606519] Allocated by task 210: [ 33.606585] kasan_save_stack+0x3c/0x68 [ 33.606762] kasan_save_track+0x20/0x40 [ 33.606903] kasan_save_alloc_info+0x40/0x58 [ 33.607000] __kasan_kmalloc+0xd4/0xd8 [ 33.607139] __kmalloc_cache_noprof+0x16c/0x3c0 [ 33.607247] rcu_uaf+0xb0/0x2d8 [ 33.607330] kunit_try_run_case+0x170/0x3f0 [ 33.607429] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 33.607545] kthread+0x328/0x630 [ 33.607650] ret_from_fork+0x10/0x20 [ 33.607747] [ 33.607792] Freed by task 0: [ 33.607878] kasan_save_stack+0x3c/0x68 [ 33.608007] kasan_save_track+0x20/0x40 [ 33.608129] kasan_save_free_info+0x4c/0x78 [ 33.608224] __kasan_slab_free+0x6c/0x98 [ 33.608317] kfree+0x214/0x3c8 [ 33.608424] rcu_uaf_reclaim+0x28/0x70 [ 33.608513] rcu_core+0x9f4/0x1e20 [ 33.608603] rcu_core_si+0x18/0x30 [ 33.608688] handle_softirqs+0x374/0xb28 [ 33.608779] __do_softirq+0x1c/0x28 [ 33.608882] [ 33.608979] Last potentially related work creation: [ 33.609078] kasan_save_stack+0x3c/0x68 [ 33.609198] kasan_record_aux_stack+0xb4/0xc8 [ 33.609316] __call_rcu_common.constprop.0+0x74/0x8c8 [ 33.609478] call_rcu+0x18/0x30 [ 33.609579] rcu_uaf+0x14c/0x2d8 [ 33.609684] kunit_try_run_case+0x170/0x3f0 [ 33.609841] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 33.610059] kthread+0x328/0x630 [ 33.610289] ret_from_fork+0x10/0x20 [ 33.610536] [ 33.610895] The buggy address belongs to the object at fff00000c57bf400 [ 33.610895] which belongs to the cache kmalloc-32 of size 32 [ 33.611070] The buggy address is located 0 bytes inside of [ 33.611070] freed 32-byte region [fff00000c57bf400, fff00000c57bf420) [ 33.611330] [ 33.611402] The buggy address belongs to the physical page: [ 33.611586] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1057bf [ 33.611759] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 33.612143] page_type: f5(slab) [ 33.612278] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 33.612399] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 33.612526] page dumped because: kasan: bad access detected [ 33.612613] [ 33.612691] Memory state around the buggy address: [ 33.612910] fff00000c57bf300: 00 00 00 fc fc fc fc fc 00 00 05 fc fc fc fc fc [ 33.613175] fff00000c57bf380: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc [ 33.613422] >fff00000c57bf400: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 33.613537] ^ [ 33.613696] fff00000c57bf480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 33.613935] fff00000c57bf500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 33.614420] ==================================================================
[ 22.397302] ================================================================== [ 22.397757] BUG: KASAN: slab-use-after-free in rcu_uaf_reclaim+0x50/0x60 [ 22.398327] Read of size 4 at addr ffff888102c09480 by task swapper/1/0 [ 22.398937] [ 22.399319] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B N 6.16.0-rc3-next-20250623 #1 PREEMPT(voluntary) [ 22.399446] Tainted: [B]=BAD_PAGE, [N]=TEST [ 22.399472] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 22.399508] Call Trace: [ 22.399557] <IRQ> [ 22.399578] dump_stack_lvl+0x73/0xb0 [ 22.399614] print_report+0xd1/0x650 [ 22.399633] ? __virt_addr_valid+0x1db/0x2d0 [ 22.399653] ? rcu_uaf_reclaim+0x50/0x60 [ 22.399669] ? kasan_complete_mode_report_info+0x64/0x200 [ 22.399690] ? rcu_uaf_reclaim+0x50/0x60 [ 22.399706] kasan_report+0x141/0x180 [ 22.399724] ? rcu_uaf_reclaim+0x50/0x60 [ 22.399744] __asan_report_load4_noabort+0x18/0x20 [ 22.399764] rcu_uaf_reclaim+0x50/0x60 [ 22.399780] rcu_core+0x66f/0x1c40 [ 22.399805] ? __pfx_rcu_core+0x10/0x10 [ 22.399823] ? ktime_get+0x6b/0x150 [ 22.399851] ? handle_softirqs+0x18e/0x730 [ 22.399874] rcu_core_si+0x12/0x20 [ 22.399891] handle_softirqs+0x209/0x730 [ 22.399906] ? hrtimer_interrupt+0x2fe/0x780 [ 22.399925] ? __pfx_handle_softirqs+0x10/0x10 [ 22.399945] __irq_exit_rcu+0xc9/0x110 [ 22.399962] irq_exit_rcu+0x12/0x20 [ 22.399978] sysvec_apic_timer_interrupt+0x81/0x90 [ 22.399998] </IRQ> [ 22.400028] <TASK> [ 22.400043] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 22.400176] RIP: 0010:pv_native_safe_halt+0xf/0x20 [ 22.400671] 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 83 f9 1d 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 [ 22.400790] RSP: 0000:ffff888100877dc8 EFLAGS: 00010216 [ 22.400900] RAX: ffff88819f555000 RBX: ffff888100853000 RCX: ffffffffb96ac165 [ 22.400944] RDX: ffffed102b626193 RSI: 0000000000000004 RDI: 000000000000c21c [ 22.400984] RBP: ffff888100877dd0 R08: 0000000000000001 R09: ffffed102b626192 [ 22.401023] R10: ffff88815b130c93 R11: 0000000000013800 R12: 0000000000000001 [ 22.401075] R13: ffffed102010a600 R14: ffffffffbb3c8a90 R15: 0000000000000000 [ 22.401162] ? ct_kernel_exit.constprop.0+0xa5/0xd0 [ 22.401233] ? default_idle+0xd/0x20 [ 22.401254] arch_cpu_idle+0xd/0x20 [ 22.401273] default_idle_call+0x48/0x80 [ 22.401305] do_idle+0x379/0x4f0 [ 22.401329] ? __pfx_do_idle+0x10/0x10 [ 22.401347] ? _raw_spin_unlock_irqrestore+0x49/0x90 [ 22.401367] ? complete+0x15b/0x1d0 [ 22.401407] cpu_startup_entry+0x5c/0x70 [ 22.401428] start_secondary+0x211/0x290 [ 22.401447] ? __pfx_start_secondary+0x10/0x10 [ 22.401469] common_startup_64+0x13e/0x148 [ 22.401497] </TASK> [ 22.401508] [ 22.419620] Allocated by task 227: [ 22.419763] kasan_save_stack+0x45/0x70 [ 22.419928] kasan_save_track+0x18/0x40 [ 22.420097] kasan_save_alloc_info+0x3b/0x50 [ 22.420244] __kasan_kmalloc+0xb7/0xc0 [ 22.420542] __kmalloc_cache_noprof+0x189/0x420 [ 22.420720] rcu_uaf+0xb0/0x330 [ 22.420882] kunit_try_run_case+0x1a5/0x480 [ 22.421304] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.421708] kthread+0x337/0x6f0 [ 22.422021] ret_from_fork+0x116/0x1d0 [ 22.422436] ret_from_fork_asm+0x1a/0x30 [ 22.422736] [ 22.422916] Freed by task 0: [ 22.423318] kasan_save_stack+0x45/0x70 [ 22.423661] kasan_save_track+0x18/0x40 [ 22.423963] kasan_save_free_info+0x3f/0x60 [ 22.424406] __kasan_slab_free+0x56/0x70 [ 22.424607] kfree+0x222/0x3f0 [ 22.424751] rcu_uaf_reclaim+0x1f/0x60 [ 22.425025] rcu_core+0x66f/0x1c40 [ 22.425329] rcu_core_si+0x12/0x20 [ 22.425494] handle_softirqs+0x209/0x730 [ 22.425757] __irq_exit_rcu+0xc9/0x110 [ 22.425955] irq_exit_rcu+0x12/0x20 [ 22.426111] sysvec_apic_timer_interrupt+0x81/0x90 [ 22.426457] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 22.426771] [ 22.426949] Last potentially related work creation: [ 22.427161] kasan_save_stack+0x45/0x70 [ 22.427369] kasan_record_aux_stack+0xb2/0xc0 [ 22.427620] __call_rcu_common.constprop.0+0x7b/0x9e0 [ 22.427946] call_rcu+0x12/0x20 [ 22.428247] rcu_uaf+0x168/0x330 [ 22.428461] kunit_try_run_case+0x1a5/0x480 [ 22.428613] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 22.428792] kthread+0x337/0x6f0 [ 22.429049] ret_from_fork+0x116/0x1d0 [ 22.429437] ret_from_fork_asm+0x1a/0x30 [ 22.429739] [ 22.429925] The buggy address belongs to the object at ffff888102c09480 [ 22.429925] which belongs to the cache kmalloc-32 of size 32 [ 22.430732] The buggy address is located 0 bytes inside of [ 22.430732] freed 32-byte region [ffff888102c09480, ffff888102c094a0) [ 22.431487] [ 22.431630] The buggy address belongs to the physical page: [ 22.431897] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102c09 [ 22.432434] flags: 0x200000000000000(node=0|zone=2) [ 22.432760] page_type: f5(slab) [ 22.433029] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 22.433394] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 22.433619] page dumped because: kasan: bad access detected [ 22.433903] [ 22.434198] Memory state around the buggy address: [ 22.434543] ffff888102c09380: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 22.435046] ffff888102c09400: 00 00 05 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 22.435578] >ffff888102c09480: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc [ 22.435912] ^ [ 22.436056] ffff888102c09500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.436343] ffff888102c09580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.436713] ==================================================================