================================================================== BUG: KASAN: slab-use-after-free in rb_sched_core_cmp kernel/sched/core.c:259 [inline] BUG: KASAN: slab-use-after-free in rb_find_first include/linux/rbtree.h:291 [inline] BUG: KASAN: slab-use-after-free in sched_core_find kernel/sched/core.c:333 [inline] BUG: KASAN: slab-use-after-free in try_steal_cookie kernel/sched/core.c:6284 [inline] BUG: KASAN: slab-use-after-free in steal_cookie_task kernel/sched/core.c:6333 [inline] BUG: KASAN: slab-use-after-free in sched_core_balance+0x5e4/0x1180 kernel/sched/core.c:6353 Read of size 8 at addr ffff888029b782d8 by task swapper/0/0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc4-next-20240823-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 rb_sched_core_cmp kernel/sched/core.c:259 [inline] rb_find_first include/linux/rbtree.h:291 [inline] sched_core_find kernel/sched/core.c:333 [inline] try_steal_cookie kernel/sched/core.c:6284 [inline] steal_cookie_task kernel/sched/core.c:6333 [inline] sched_core_balance+0x5e4/0x1180 kernel/sched/core.c:6353 do_balance_callbacks kernel/sched/core.c:4963 [inline] __balance_callbacks+0x188/0x280 kernel/sched/core.c:5017 finish_lock_switch kernel/sched/core.c:5064 [inline] finish_task_switch+0x1d3/0x870 kernel/sched/core.c:5183 context_switch kernel/sched/core.c:5314 [inline] __schedule+0x1852/0x4b30 kernel/sched/core.c:6677 schedule_idle+0x53/0x90 kernel/sched/core.c:6795 do_idle+0x56a/0x5d0 kernel/sched/idle.c:354 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:424 rest_init+0x2dc/0x300 init/main.c:747 start_kernel+0x47f/0x500 init/main.c:1105 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147 Allocated by task 6619: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4036 [inline] slab_alloc_node mm/slub.c:4085 [inline] kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4128 alloc_task_struct_node kernel/fork.c:180 [inline] dup_task_struct+0x57/0x8c0 kernel/fork.c:1107 copy_process+0x5d1/0x3d50 kernel/fork.c:2203 kernel_clone+0x226/0x8f0 kernel/fork.c:2784 __do_sys_clone3 kernel/fork.c:3088 [inline] __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3067 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6581: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2299 [inline] slab_free mm/slub.c:4521 [inline] kmem_cache_free+0x194/0x3d0 mm/slub.c:4623 put_task_struct include/linux/sched/task.h:139 [inline] delayed_put_task_struct+0x125/0x300 kernel/exit.c:228 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1037 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 __call_rcu_common kernel/rcu/tree.c:3086 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3190 context_switch kernel/sched/core.c:5314 [inline] __schedule+0x1852/0x4b30 kernel/sched/core.c:6677 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6856 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6880 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 unwind_next_frame+0x18f8/0x22d0 arch/x86/kernel/unwind_orc.c:672 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 save_stack+0xfb/0x1f0 mm/page_owner.c:156 __set_page_owner+0x92/0x800 mm/page_owner.c:320 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1517 prep_new_page mm/page_alloc.c:1525 [inline] get_page_from_freelist+0x312a/0x3270 mm/page_alloc.c:3476 __alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4748 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 folio_alloc_mpol_noprof mm/mempolicy.c:2283 [inline] vma_alloc_folio_noprof+0x12e/0x230 mm/mempolicy.c:2314 folio_prealloc+0x31/0x170 alloc_anon_folio mm/memory.c:4496 [inline] do_anonymous_page mm/memory.c:4553 [inline] do_pte_missing mm/memory.c:3945 [inline] handle_pte_fault+0x258a/0x67b0 mm/memory.c:5522 __handle_mm_fault mm/memory.c:5665 [inline] handle_mm_fault+0x1029/0x1980 mm/memory.c:5833 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 The buggy address belongs to the object at ffff888029b78000 which belongs to the cache task_struct of size 7424 The buggy address is located 728 bytes inside of freed 7424-byte region [ffff888029b78000, ffff888029b79d00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29b78 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8880238a5681 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff8880166fb500 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000040004 00000001f5000000 ffff8880238a5681 head: 00fff00000000040 ffff8880166fb500 dead000000000100 dead000000000122 head: 0000000000000000 0000000000040004 00000001f5000000 ffff8880238a5681 head: 00fff00000000003 ffffea0000a6de01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 11, tgid 11 (kworker/u8:0), ts 9105664960, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1517 prep_new_page mm/page_alloc.c:1525 [inline] get_page_from_freelist+0x312a/0x3270 mm/page_alloc.c:3476 __alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4748 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2368 allocate_slab+0x5a/0x2f0 mm/slub.c:2531 new_slab mm/slub.c:2584 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3771 __slab_alloc+0x58/0xa0 mm/slub.c:3861 __slab_alloc_node mm/slub.c:3914 [inline] slab_alloc_node mm/slub.c:4073 [inline] kmem_cache_alloc_node_noprof+0x1fe/0x320 mm/slub.c:4128 alloc_task_struct_node kernel/fork.c:180 [inline] dup_task_struct+0x57/0x8c0 kernel/fork.c:1107 copy_process+0x5d1/0x3d50 kernel/fork.c:2203 kernel_clone+0x226/0x8f0 kernel/fork.c:2784 user_mode_thread+0x132/0x1a0 kernel/fork.c:2862 call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:172 process_one_work kernel/workqueue.c:3232 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3313 worker_thread+0x86d/0xd10 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 page_owner free stack trace missing Memory state around the buggy address: ffff888029b78180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888029b78200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888029b78280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888029b78300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888029b78380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================