================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x114/0x7680 kernel/locking/lockdep.c:4919 Read of size 8 at addr ffff0000d88809b0 by task swapper/0/0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.1.87-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:395 kasan_report+0xd4/0x130 mm/kasan/report.c:495 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 __lock_acquire+0x114/0x7680 kernel/locking/lockdep.c:4919 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x6c/0xb4 kernel/locking/spinlock.c:162 try_to_wake_up+0xb4/0xe60 kernel/sched/core.c:4112 wake_up_process+0x18/0x24 kernel/sched/core.c:4362 nilfs_construction_timeout+0x40/0x50 fs/nilfs2/segment.c:2444 call_timer_fn+0x1c0/0xa1c kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1549 [inline] __run_timers+0x554/0x718 kernel/time/timer.c:1820 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1833 __do_softirq+0x314/0xe38 kernel/softirq.c:571 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:893 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0x264/0x4d4 kernel/softirq.c:650 irq_exit_rcu+0x14/0x84 kernel/softirq.c:662 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581 arch_local_irq_enable+0xc/0x18 arch/arm64/include/asm/irqflags.h:35 default_idle_call+0x68/0xdc kernel/sched/idle.c:109 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0x1e0/0x514 kernel/sched/idle.c:303 cpu_startup_entry+0x5c/0x74 kernel/sched/idle.c:401 rest_init+0x2d8/0x2f0 init/main.c:732 start_kernel+0x0/0x608 init/main.c:892 start_kernel+0x448/0x608 init/main.c:1139 __primary_switched+0xb8/0xc0 arch/arm64/kernel/head.S:468 Allocated by task 2: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x74/0x458 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] kmem_cache_alloc_node+0x258/0x3b4 mm/slub.c:3443 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct+0x74/0x7dc kernel/fork.c:980 copy_process+0x530/0x38d0 kernel/fork.c:2098 kernel_clone+0x1d8/0x98c kernel/fork.c:2682 kernel_thread+0x128/0x1a8 kernel/fork.c:2742 create_kthread kernel/kthread.c:399 [inline] kthreadd+0x49c/0x674 kernel/kthread.c:746 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Freed by task 5554: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] kmem_cache_free+0x2f0/0x588 mm/slub.c:3683 free_task_struct kernel/fork.c:176 [inline] free_task+0xe8/0x14c kernel/fork.c:563 __put_task_struct+0x178/0x210 kernel/fork.c:851 put_task_struct include/linux/sched/task.h:145 [inline] delayed_put_task_struct+0x140/0x404 kernel/exit.c:225 rcu_do_batch kernel/rcu/tree.c:2296 [inline] rcu_core+0x878/0x1c24 kernel/rcu/tree.c:2556 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2573 __do_softirq+0x314/0xe38 kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0xfc/0xa40 kernel/rcu/tree.c:2844 put_task_struct_rcu_user+0x68/0xcc kernel/exit.c:231 finish_task_switch+0x5c4/0x624 kernel/sched/core.c:5158 context_switch kernel/sched/core.c:5248 [inline] __schedule+0xee8/0x1c98 kernel/sched/core.c:6558 preempt_schedule_irq+0x8c/0x1b8 kernel/sched/core.c:6870 arm64_preempt_schedule_irq arch/arm64/kernel/entry-common.c:265 [inline] __el1_irq arch/arm64/kernel/entry-common.c:474 [inline] el1_interrupt+0x4c/0x68 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline] lock_acquire+0x2ac/0x7cc kernel/locking/lockdep.c:5665 rcu_lock_acquire+0x40/0x4c include/linux/rcupdate.h:350 rcu_read_lock include/linux/rcupdate.h:791 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0xd0/0x580 net/batman-adv/network-coding.c:719 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Second to last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0xfc/0xa40 kernel/rcu/tree.c:2844 put_task_struct_rcu_user+0x68/0xcc kernel/exit.c:231 finish_task_switch+0x5c4/0x624 kernel/sched/core.c:5158 context_switch kernel/sched/core.c:5248 [inline] __schedule+0xee8/0x1c98 kernel/sched/core.c:6558 preempt_schedule_common+0xf4/0x1e8 kernel/sched/core.c:6727 preempt_schedule+0x64/0x84 kernel/sched/core.c:6751 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irq+0x8c/0x90 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:401 [inline] do_group_exit+0x184/0x22c kernel/exit.c:1016 __do_sys_exit_group kernel/exit.c:1030 [inline] __se_sys_exit_group kernel/exit.c:1028 [inline] __wake_up_parent+0x0/0x60 kernel/exit.c:1028 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000d8880000 which belongs to the cache task_struct of size 6848 The buggy address is located 2480 bytes inside of 6848-byte region [ffff0000d8880000, ffff0000d8881ac0) The buggy address belongs to the physical page: page:00000000c1cc9a4a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x118880 head:00000000c1cc9a4a order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff0000e68b8901 flags: 0x5ffe00000010200(slab|head|node=0|zone=2|lastcpupid=0xfff) raw: 05ffe00000010200 dead000000000100 dead000000000122 ffff0000c03dcf00 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff0000e68b8901 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d8880880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d8880900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d8880980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d8880a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d8880a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================