================================================================== BUG: KASAN: slab-use-after-free in __sched_core_less kernel/sched/core.c:234 [inline] BUG: KASAN: slab-use-after-free in rb_sched_core_less kernel/sched/core.c:251 [inline] BUG: KASAN: slab-use-after-free in rb_add include/linux/rbtree.h:203 [inline] BUG: KASAN: slab-use-after-free in sched_core_enqueue+0x15b/0x580 kernel/sched/core.c:275 Read of size 8 at addr ffff88801cfebed8 by task kworker/u8:9/3039 CPU: 0 UID: 0 PID: 3039 Comm: kworker/u8:9 Not tainted 6.11.0-rc4-next-20240820-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: events_unbound linkwatch_event 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 __sched_core_less kernel/sched/core.c:234 [inline] rb_sched_core_less kernel/sched/core.c:251 [inline] rb_add include/linux/rbtree.h:203 [inline] sched_core_enqueue+0x15b/0x580 kernel/sched/core.c:275 activate_task kernel/sched/core.c:2056 [inline] ttwu_do_activate+0x1d1/0x7e0 kernel/sched/core.c:3665 ttwu_queue kernel/sched/core.c:3940 [inline] try_to_wake_up+0x8bc/0x1480 kernel/sched/core.c:4266 wake_up_process kernel/sched/core.c:4398 [inline] wake_up_q+0xc8/0x120 kernel/sched/core.c:1056 __mutex_unlock_slowpath+0x6f9/0x750 kernel/locking/mutex.c:956 __rtnl_unlock+0x6c/0xf0 net/core/rtnetlink.c:138 netdev_run_todo+0x375/0x1000 net/core/dev.c:10731 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 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5311: 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:2206 kernel_clone+0x226/0x8f0 kernel/fork.c:2787 __do_sys_clone3 kernel/fork.c:3091 [inline] __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3070 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 5225: 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+0x195/0x3d0 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+0x11b/0x1e0 kernel/softirq.c:455 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382 __dev_open+0x34a/0x450 net/core/dev.c:1482 __dev_change_flags+0x1e2/0x6f0 net/core/dev.c:8838 dev_change_flags+0x8b/0x1a0 net/core/dev.c:8910 do_setlink+0xcd0/0x41f0 net/core/rtnetlink.c:2900 __rtnl_newlink net/core/rtnetlink.c:3696 [inline] rtnl_newlink+0x180d/0x20a0 net/core/rtnetlink.c:3743 rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x3a8/0x500 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2212 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 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_irq+0xfb/0x1c0 kernel/sched/core.c:6999 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707 Second to 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 task_work_add+0xb8/0x450 kernel/task_work.c:66 task_tick_mm_cid kernel/sched/core.c:10422 [inline] sched_tick+0x322/0x610 kernel/sched/core.c:5594 update_process_times+0x202/0x230 kernel/time/timer.c:2492 tick_sched_handle kernel/time/tick-sched.c:276 [inline] tick_nohz_handler+0x37c/0x500 kernel/time/tick-sched.c:297 __run_hrtimer kernel/time/hrtimer.c:1691 [inline] __hrtimer_run_queues+0x551/0xd50 kernel/time/hrtimer.c:1755 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1026 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1043 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1037 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 The buggy address belongs to the object at ffff88801cfebc00 which belongs to the cache task_struct of size 7424 The buggy address is located 728 bytes inside of freed 7424-byte region [ffff88801cfebc00, ffff88801cfed900) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1cfe8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888025186d81 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff8880166fb500 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080040004 00000001fdffffff ffff888025186d81 head: 00fff00000000040 ffff8880166fb500 0000000000000000 dead000000000001 head: 0000000000000000 0000000080040004 00000001fdffffff ffff888025186d81 head: 00fff00000000003 ffffea000073fa01 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 2, tgid 2 (kthreadd), ts 7882471527, 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+0x3004/0x30c0 mm/page_alloc.c:3476 __alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4743 __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:2206 kernel_clone+0x226/0x8f0 kernel/fork.c:2787 kernel_thread+0x1bc/0x240 kernel/fork.c:2849 create_kthread kernel/kthread.c:412 [inline] kthreadd+0x60d/0x810 kernel/kthread.c:765 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 page_owner free stack trace missing Memory state around the buggy address: ffff88801cfebd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801cfebe00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801cfebe80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801cfebf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801cfebf80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================