================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x114/0x764c kernel/locking/lockdep.c:4926 Read of size 8 at addr ffff000129cf4130 by task kworker/u4:5/4325 CPU: 1 PID: 4325 Comm: kworker/u4:5 Not tainted 6.1.32-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Workqueue: btrfs-delalloc btrfs_work_helper 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+0x114/0x764c kernel/locking/lockdep.c:4926 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __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:4108 wake_up_process+0x18/0x24 kernel/sched/core.c:4358 btrfs_add_delayed_iput+0x26c/0x2cc fs/btrfs/inode.c:3583 async_cow_free+0x54/0x490 fs/btrfs/inode.c:1500 run_ordered_work fs/btrfs/async-thread.c:254 [inline] btrfs_work_helper+0x98c/0xd98 fs/btrfs/async-thread.c:290 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 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:972 copy_process+0x530/0x38d0 kernel/fork.c:2090 kernel_clone+0x1d8/0x98c kernel/fork.c:2679 kernel_thread+0x128/0x1a8 kernel/fork.c:2739 create_kthread kernel/kthread.c:399 [inline] kthreadd+0x49c/0x674 kernel/kthread.c:746 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Freed by task 21: 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+0xe0/0x144 kernel/fork.c:562 __put_task_struct+0x180/0x218 kernel/fork.c:851 put_task_struct include/linux/sched/task.h:119 [inline] delayed_put_task_struct+0x140/0x404 kernel/exit.c:225 rcu_do_batch kernel/rcu/tree.c:2251 [inline] rcu_core+0x878/0x1c10 kernel/rcu/tree.c:2511 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2528 __do_softirq+0x30c/0xea0 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:2799 put_task_struct_rcu_user+0x68/0xcc kernel/exit.c:231 finish_task_switch+0x5c4/0x624 kernel/sched/core.c:5154 context_switch kernel/sched/core.c:5244 [inline] __schedule+0xee8/0x1c98 kernel/sched/core.c:6554 preempt_schedule_common+0xf4/0x1e8 kernel/sched/core.c:6723 preempt_schedule+0x64/0x84 kernel/sched/core.c:6747 try_to_wake_up+0x62c/0xe60 kernel/sched/core.c:4230 wake_up_state+0x14/0x20 kernel/sched/core.c:4364 kthread_unpark+0x174/0x204 kernel/kthread.c:636 kthread_stop+0x1ac/0x8c0 kernel/kthread.c:706 close_ctree+0x418/0xad8 fs/btrfs/disk-io.c:4696 btrfs_put_super+0x40/0x50 fs/btrfs/super.c:394 generic_shutdown_super+0x130/0x328 fs/super.c:501 kill_anon_super+0x4c/0x74 fs/super.c:1108 btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2445 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2144/0x3470 arch/arm64/kernel/signal.c:1132 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 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:2799 put_task_struct_rcu_user+0x68/0xcc kernel/exit.c:231 finish_task_switch+0x5c4/0x624 kernel/sched/core.c:5154 schedule_tail+0x20/0x130 kernel/sched/core.c:5176 ret_from_fork+0x4/0x20 arch/arm64/kernel/entry.S:857 The buggy address belongs to the object at ffff000129cf3780 which belongs to the cache task_struct of size 6848 The buggy address is located 2480 bytes inside of 6848-byte region [ffff000129cf3780, ffff000129cf5240) The buggy address belongs to the physical page: page:00000000c50d5cdf refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x169cf0 head:00000000c50d5cdf order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff0000ddb08b01 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc00037ade00 dead000000000002 ffff0000c0884d80 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff0000ddb08b01 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff000129cf4000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff000129cf4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff000129cf4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff000129cf4180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff000129cf4200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================