syzbot

NOHZ tick-stop error: local softirq work is pending, handler #02!!!
==================================================================
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 ffff8880229bdcd8 by task swapper/0/0

CPU: 0 UID: 0 PID: 0 Comm: swapper/0 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]
 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
 </TASK>

Allocated by task 5319:
 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 36:
 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
 do_softirq+0x11b/0x1e0 kernel/softirq.c:455
 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 addrconf_dad_work+0x2ec/0x16f0 net/ipv6/addrconf.c:4226
 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

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

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 ffff8880229bda00
 which belongs to the cache task_struct of size 7424
The buggy address is located 728 bytes inside of
 freed 7424-byte region [ffff8880229bda00, ffff8880229bf700)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x229b8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88802b4c2541
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff8880166f8500 ffffea0000870e00 dead000000000002
raw: 0000000000000000 0000000000040004 00000001f5000000 ffff88802b4c2541
head: 00fff00000000040 ffff8880166f8500 ffffea0000870e00 dead000000000002
head: 0000000000000000 0000000000040004 00000001f5000000 ffff88802b4c2541
head: 00fff00000000003 ffffea00008a6e01 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 7129765693, 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
 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
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8880229bdb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880229bdc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880229bdc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff8880229bdd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880229bdd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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