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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 pick_next_task kernel/sched/core.c:6178 [inline]
BUG: KASAN: slab-use-after-free in __schedule+0x374a/0x4b30 kernel/sched/core.c:6632
Read of size 8 at addr ffff888019f33ed8 by task udevd/4685

CPU: 1 UID: 0 PID: 4685 Comm: udevd Not tainted 6.11.0-rc5-next-20240827-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
 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]
 pick_next_task kernel/sched/core.c:6178 [inline]
 __schedule+0x374a/0x4b30 kernel/sched/core.c:6632
 __schedule_loop kernel/sched/core.c:6754 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6769
 schedule_hrtimeout_range_clock+0x272/0x440 kernel/time/hrtimer.c:2281
 ep_poll fs/eventpoll.c:2062 [inline]
 do_epoll_wait+0x1d89/0x2040 fs/eventpoll.c:2459
 __do_sys_epoll_wait fs/eventpoll.c:2471 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2466 [inline]
 __x64_sys_epoll_wait+0x257/0x2a0 fs/eventpoll.c:2466
 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: 0033:0x7ff635f23457
Code: 73 01 c3 48 8b 0d d1 d9 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 e8 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 76 48 8b 15 a2 d9 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffd4b139d68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 00007ffd4b139e68 RCX: 00007ff635f23457
RDX: 0000000000000008 RSI: 00007ffd4b139e68 RDI: 000000000000000b
RBP: 00000000000000d9 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000bb8
R13: 0000556ec5effb60 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 5384:
 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:4040 [inline]
 slab_alloc_node mm/slub.c:4089 [inline]
 kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4132
 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 24:
 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:4525 [inline]
 kmem_cache_free+0x194/0x3d0 mm/slub.c:4627
 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
 run_ksoftirqd+0xca/0x130 kernel/softirq.c:927
 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164
 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

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
 __schedule_loop kernel/sched/core.c:6754 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6769
 do_nanosleep+0x197/0x600 kernel/time/hrtimer.c:2032
 hrtimer_nanosleep+0x1e3/0x3f0 kernel/time/hrtimer.c:2080
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1411 [inline]
 __se_sys_clock_nanosleep+0x32b/0x3c0 kernel/time/posix-timers.c:1388
 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 ffff888019f33c00
 which belongs to the cache task_struct of size 7424
The buggy address is located 728 bytes inside of
 freed 7424-byte region [ffff888019f33c00, ffff888019f35900)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x19f30
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88802c7b2941
ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff888140409500 ffffea0001ddd800 dead000000000003
raw: 0000000000000000 0000000000040004 00000001f5000000 ffff88802c7b2941
head: 00fff00000000040 ffff888140409500 ffffea0001ddd800 dead000000000003
head: 0000000000000000 0000000000040004 00000001f5000000 ffff88802c7b2941
head: 00fff00000000003 ffffea000067cc01 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 5892448331, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1520
 prep_new_page mm/page_alloc.c:1528 [inline]
 get_page_from_freelist+0x312a/0x3270 mm/page_alloc.c:3479
 __alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4751
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 alloc_slab_page+0x6a/0x120 mm/slub.c:2369
 allocate_slab+0x5a/0x2f0 mm/slub.c:2535
 new_slab mm/slub.c:2588 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3775
 __slab_alloc+0x58/0xa0 mm/slub.c:3865
 __slab_alloc_node mm/slub.c:3918 [inline]
 slab_alloc_node mm/slub.c:4077 [inline]
 kmem_cache_alloc_node_noprof+0x1fe/0x320 mm/slub.c:4132
 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
 kernel_thread+0x1bc/0x240 kernel/fork.c:2846
 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:
 ffff888019f33d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888019f33e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888019f33e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff888019f33f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888019f33f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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