==================================================================
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 ffff88802bd75cd8 by task syz.4.23/5415

CPU: 1 UID: 0 PID: 5415 Comm: syz.4.23 Not tainted 6.11.0-rc4-next-20240821-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __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
 autoremove_wake_function+0x16/0x110 kernel/sched/wait.c:384
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock+0x130/0x1e0 kernel/sched/wait.c:106
 __unix_dgram_recvmsg+0x5f4/0x12f0 net/unix/af_unix.c:2462
 sock_recvmsg_nosec+0x18e/0x1d0 net/socket.c:1046
 ____sys_recvmsg+0x3c0/0x470 net/socket.c:2814
 ___sys_recvmsg net/socket.c:2858 [inline]
 do_recvmmsg+0x464/0xad0 net/socket.c:2952
 __sys_recvmmsg net/socket.c:3031 [inline]
 __do_sys_recvmmsg net/socket.c:3054 [inline]
 __se_sys_recvmmsg net/socket.c:3047 [inline]
 __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3047
 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
RIP: 0033:0x7f1ab7779e79
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1ab856b038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f1ab7916058 RCX: 00007f1ab7779e79
RDX: 0000000000010106 RSI: 00000000200000c0 RDI: 0000000000000006
RBP: 00007f1ab77e7916 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1ab7916058 R15: 00007fff1d176428
 </TASK>

Allocated by task 5422:
 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 5420:
 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
 lock_sock include/net/sock.h:1607 [inline]
 netlink_insert+0xd7/0x14b0 net/netlink/af_netlink.c:575
 __netlink_kernel_create+0x2d4/0x6f0 net/netlink/af_netlink.c:2043
 netlink_kernel_create include/linux/netlink.h:61 [inline]
 xfrm_user_net_init+0xa8/0x160 net/xfrm/xfrm_user.c:4010
 ops_init+0x31e/0x590 net/core/net_namespace.c:139
 setup_net+0x287/0x9e0 net/core/net_namespace.c:356
 copy_net_ns+0x33f/0x570 net/core/net_namespace.c:494
 create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
 ksys_unshare+0x619/0xc10 kernel/fork.c:3315
 __do_sys_unshare kernel/fork.c:3386 [inline]
 __se_sys_unshare kernel/fork.c:3384 [inline]
 __x64_sys_unshare+0x38/0x40 kernel/fork.c:3384
 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_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
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
 _raw_spin_unlock_irq+0x44/0x50 kernel/locking/spinlock.c:202
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 do_group_exit+0x1f7/0x2c0 kernel/exit.c:1085
 __do_sys_exit_group kernel/exit.c:1099 [inline]
 __se_sys_exit_group kernel/exit.c:1097 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097
 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232
 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

The buggy address belongs to the object at ffff88802bd75a00
 which belongs to the cache task_struct of size 7424
The buggy address is located 728 bytes inside of
 freed 7424-byte region [ffff88802bd75a00, ffff88802bd77700)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2bd70
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88807492c141
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000040 ffff8880166fb500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080040004 00000001fdffffff ffff88807492c141
head: 00fff00000000040 ffff8880166fb500 dead000000000100 dead000000000122
head: 0000000000000000 0000000080040004 00000001fdffffff ffff88807492c141
head: 00fff00000000003 ffffea0000af5c01 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 16465852234, 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:
 ffff88802bd75b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802bd75c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802bd75c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff88802bd75d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802bd75d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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