==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x114/0x7638 kernel/locking/lockdep.c:4882
Read of size 8 at addr ffff0000d1f4a458 by task dhcpcd/3636

CPU: 0 PID: 3636 Comm: dhcpcd Not tainted 5.15.157-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 __asan_report_load8_noabort+0x44/0x50 mm/kasan/report_generic.c:309
 __lock_acquire+0x114/0x7638 kernel/locking/lockdep.c:4882
 lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xc4/0x14c kernel/locking/spinlock.c:162
 try_to_wake_up+0xb0/0xc2c kernel/sched/core.c:4030
 wake_up_process+0x18/0x24 kernel/sched/core.c:4215
 nilfs_construction_timeout+0x40/0x50 fs/nilfs2/segment.c:2446
 call_timer_fn+0x19c/0x8f0 kernel/time/timer.c:1451
 expire_timers kernel/time/timer.c:1496 [inline]
 __run_timers+0x554/0x718 kernel/time/timer.c:1767
 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1780
 __do_softirq+0x344/0xdb0 kernel/softirq.c:558
 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
 invoke_softirq kernel/softirq.c:439 [inline]
 __irq_exit_rcu+0x264/0x4d4 kernel/softirq.c:637
 irq_exit+0x14/0x88 kernel/softirq.c:661
 handle_domain_irq+0xf4/0x178 kernel/irq/irqdesc.c:710
 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:758
 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899
 do_interrupt_handler+0x74/0x94 arch/arm64/kernel/entry-common.c:267
 el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:454
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470
 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:580
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline]
 ___slab_alloc+0xc58/0xdbc mm/slub.c:2963
 __slab_alloc mm/slub.c:3095 [inline]
 slab_alloc_node mm/slub.c:3186 [inline]
 kmem_cache_alloc_node+0x304/0x49c mm/slub.c:3256
 __alloc_skb+0x174/0x584 net/core/skbuff.c:415
 alloc_skb include/linux/skbuff.h:1167 [inline]
 alloc_uevent_skb+0x78/0x1e4 lib/kobject_uevent.c:290
 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline]
 kobject_uevent_net_broadcast+0x160/0x544 lib/kobject_uevent.c:412
 kobject_uevent_env+0x550/0x898 lib/kobject_uevent.c:593
 kobject_uevent+0x2c/0x3c lib/kobject_uevent.c:642
 netdev_queue_add_kobject net/core/net-sysfs.c:1677 [inline]
 netdev_queue_update_kobjects+0x1d0/0x404 net/core/net-sysfs.c:1711
 register_queue_kobjects net/core/net-sysfs.c:1772 [inline]
 netdev_register_kobject+0x22c/0x2d8 net/core/net-sysfs.c:2018
 register_netdevice+0xdf8/0x12d4 net/core/dev.c:10357
 lapbeth_new_device drivers/net/wan/lapbether.c:418 [inline]
 lapbeth_device_event+0x67c/0x960 drivers/net/wan/lapbether.c:460
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:391
 __dev_notify_flags+0x2ac/0x534
 dev_change_flags+0xc8/0x154 net/core/dev.c:8889
 devinet_ioctl+0x858/0x17fc net/ipv4/devinet.c:1142
 inet_ioctl+0x2ac/0x500 net/ipv4/af_inet.c:978
 sock_do_ioctl+0x134/0x2dc net/socket.c:1140
 sock_ioctl+0x4f0/0x8ac net/socket.c:1257
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Allocated by task 2:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x8c/0xcc mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x74/0x3f4 mm/slab.h:519
 slab_alloc_node mm/slub.c:3220 [inline]
 kmem_cache_alloc_node+0x208/0x49c mm/slub.c:3256
 alloc_task_struct_node kernel/fork.c:171 [inline]
 dup_task_struct+0x74/0xcf0 kernel/fork.c:894
 copy_process+0x52c/0x3750 kernel/fork.c:2038
 kernel_clone+0x1d8/0xa58 kernel/fork.c:2604
 kernel_thread+0x148/0x1bc kernel/fork.c:2656
 create_kthread kernel/kthread.c:357 [inline]
 kthreadd+0x588/0x7d0 kernel/kthread.c:701
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870

Freed by task 384:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x84 mm/kasan/common.c:46
 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360
 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1705 [inline]
 slab_free_freelist_hook+0x128/0x1ec mm/slub.c:1731
 slab_free mm/slub.c:3499 [inline]
 kmem_cache_free+0xdc/0x3c4 mm/slub.c:3515
 free_task_struct kernel/fork.c:176 [inline]
 free_task+0xe8/0x14c kernel/fork.c:474
 __put_task_struct+0x1a8/0x24c kernel/fork.c:763
 put_task_struct include/linux/sched/task.h:141 [inline]
 delayed_put_task_struct+0x124/0x380 kernel/exit.c:220
 rcu_do_batch kernel/rcu/tree.c:2523 [inline]
 rcu_core+0x830/0x1b34 kernel/rcu/tree.c:2763
 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2776
 __do_softirq+0x344/0xdb0 kernel/softirq.c:558

Last potentially related work creation:
 kasan_save_stack+0x38/0x68 mm/kasan/common.c:38
 kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:3007 [inline]
 call_rcu+0x118/0xb40 kernel/rcu/tree.c:3087
 put_task_struct_rcu_user+0x70/0xe0 kernel/exit.c:226
 finish_task_switch+0x3a0/0x6b4 kernel/sched/core.c:4944
 context_switch kernel/sched/core.c:5033 [inline]
 __schedule+0xf14/0x1e48 kernel/sched/core.c:6376
 schedule+0x11c/0x1c8 kernel/sched/core.c:6459
 nilfs_segctor_kill_thread fs/nilfs2/segment.c:2681 [inline]
 nilfs_segctor_destroy fs/nilfs2/segment.c:2763 [inline]
 nilfs_detach_log_writer+0x280/0xa6c fs/nilfs2/segment.c:2852
 nilfs_put_super+0x4c/0x130 fs/nilfs2/super.c:498
 generic_shutdown_super+0x130/0x29c fs/super.c:475
 kill_block_super+0x70/0xdc fs/super.c:1414
 deactivate_locked_super+0xb8/0x13c fs/super.c:335
 deactivate_super+0x108/0x128 fs/super.c:366
 cleanup_mnt+0x3c0/0x474 fs/namespace.c:1143
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1150
 task_work_run+0x130/0x1e4 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 do_notify_resume+0x262c/0x32b8 arch/arm64/kernel/signal.c:946
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
 el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:609
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Second to last potentially related work creation:
 kasan_save_stack+0x38/0x68 mm/kasan/common.c:38
 kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:3007 [inline]
 call_rcu+0x118/0xb40 kernel/rcu/tree.c:3087
 put_task_struct_rcu_user+0x70/0xe0 kernel/exit.c:226
 finish_task_switch+0x3a0/0x6b4 kernel/sched/core.c:4944
 context_switch kernel/sched/core.c:5033 [inline]
 __schedule+0xf14/0x1e48 kernel/sched/core.c:6376
 schedule+0x11c/0x1c8 kernel/sched/core.c:6459
 do_notify_resume+0x1b8/0x32b8 arch/arm64/kernel/signal.c:929
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
 el0_interrupt+0x118/0x2d4 arch/arm64/kernel/entry-common.c:685
 __el0_irq_handler_common+0x18/0x24 arch/arm64/kernel/entry-common.c:690
 el0t_64_irq_handler+0x10/0x1c arch/arm64/kernel/entry-common.c:695
 el0t_64_irq+0x1a0/0x1a4 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000d1f49b40
 which belongs to the cache task_struct of size 6720
The buggy address is located 2328 bytes inside of
 6720-byte region [ffff0000d1f49b40, ffff0000d1f4b580)
The buggy address belongs to the page:
page:0000000015873ef4 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000d1f48000 pfn:0x111f48
head:0000000015873ef4 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff0000e9976601
flags: 0x5ffe00000010200(slab|head|node=0|zone=2|lastcpupid=0xfff)
raw: 05ffe00000010200 fffffc000363aa08 fffffc000348c408 ffff0000c0840d80
raw: ffff0000d1f48000 0000000000040003 00000001ffffffff ffff0000e9976601
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d1f4a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000d1f4a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000d1f4a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff0000d1f4a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000d1f4a500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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