==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x114/0x7638 kernel/locking/lockdep.c:4882
Read of size 8 at addr ffff0000e66d5ad8 by task kworker/u4:1/136

CPU: 1 PID: 136 Comm: kworker/u4:1 Not tainted 5.15.158-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: bat_events batadv_nc_worker
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_enable arch/arm64/include/asm/irqflags.h:35 [inline]
 __local_bh_enable_ip+0x238/0x470 kernel/softirq.c:388
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline]
 _raw_spin_unlock_bh+0xf8/0x180 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:408 [inline]
 batadv_nc_purge_paths+0x308/0x38c net/batman-adv/network-coding.c:475
 batadv_nc_worker+0x314/0x580 net/batman-adv/network-coding.c:726
 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310
 worker_thread+0x910/0x1034 kernel/workqueue.c:2457
 kthread+0x37c/0x45c kernel/kthread.c:334
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870

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 4941:
 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
 freezable_schedule include/linux/freezer.h:172 [inline]
 do_nanosleep+0x1a4/0x668 kernel/time/hrtimer.c:2045
 hrtimer_nanosleep+0x1f0/0x384 kernel/time/hrtimer.c:2098
 common_nsleep+0xa8/0xc0 kernel/time/posix-timers.c:1272
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1313 [inline]
 __se_sys_clock_nanosleep kernel/time/posix-timers.c:1290 [inline]
 __arm64_sys_clock_nanosleep+0x350/0x38c kernel/time/posix-timers.c:1290
 __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

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
 preempt_schedule_common+0x140/0x260 kernel/sched/core.c:6552
 preempt_schedule+0x64/0x84 kernel/sched/core.c:6577
 lru_cache_add+0x578/0x738 mm/swap.c:454
 shmem_getpage_gfp+0x1430/0x20e4 mm/shmem.c:1945
 shmem_getpage mm/shmem.c:151 [inline]
 shmem_write_begin+0xe0/0x29c mm/shmem.c:2477
 generic_perform_write+0x24c/0x520 mm/filemap.c:3785
 __generic_file_write_iter+0x230/0x454 mm/filemap.c:3912
 generic_file_write_iter+0xb4/0x1b8 mm/filemap.c:3944
 call_write_iter include/linux/fs.h:2172 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x87c/0xb3c fs/read_write.c:594
 ksys_write+0x15c/0x26c fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:656
 __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

The buggy address belongs to the object at ffff0000e66d51c0
 which belongs to the cache task_struct of size 6720
The buggy address is located 2328 bytes inside of
 6720-byte region [ffff0000e66d51c0, ffff0000e66d6c00)
The buggy address belongs to the page:
page:00000000cca8f292 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1266d0
head:00000000cca8f292 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff0000e6c95901
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 fffffc00035b5200 0000000200000002 ffff0000c0840d80
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff0000e6c95901
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e66d5980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000e66d5a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000e66d5a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff0000e66d5b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000e66d5b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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