================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x114/0x7680 kernel/locking/lockdep.c:4919 Read of size 8 at addr ffff0000ce4d5cf0 by task kworker/u4:1/11 CPU: 1 PID: 11 Comm: kworker/u4:1 Not tainted 6.1.108-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 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+0x114/0x7680 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:4108 wake_up_process+0x18/0x24 kernel/sched/core.c:4358 btrfs_add_delayed_iput+0x26c/0x2cc fs/btrfs/inode.c:3605 async_cow_start+0x6c/0x94 fs/btrfs/inode.c:1460 btrfs_work_helper+0x32c/0xdb4 fs/btrfs/async-thread.c:280 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 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 4656: 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:2297 [inline] rcu_core+0x880/0x1c48 kernel/rcu/tree.c:2557 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2574 handle_softirqs+0x318/0xd58 kernel/softirq.c:571 __do_softirq+0x14/0x20 kernel/softirq.c:605 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:2845 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+0xef8/0x1d44 kernel/sched/core.c:6558 preempt_schedule_common+0xf4/0x1e8 kernel/sched/core.c:6727 preempt_schedule+0x64/0x84 kernel/sched/core.c:6751 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:4705 btrfs_put_super+0x70/0x80 fs/btrfs/super.c:397 generic_shutdown_super+0x130/0x328 fs/super.c:501 kill_anon_super+0x4c/0x74 fs/super.c:1128 btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2449 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:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2148/0x3474 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:585 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:2845 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+0xef8/0x1d44 kernel/sched/core.c:6558 preempt_schedule_common+0xf4/0x1e8 kernel/sched/core.c:6727 preempt_schedule+0x64/0x84 kernel/sched/core.c:6751 folio_add_lru+0x3c8/0x584 mm/swap.c:535 shmem_get_folio_gfp+0x1284/0x21f0 mm/shmem.c:1976 shmem_get_folio mm/shmem.c:2072 [inline] shmem_write_begin+0x13c/0x4e8 mm/shmem.c:2559 generic_perform_write+0x278/0x55c mm/filemap.c:3817 __generic_file_write_iter+0x168/0x388 mm/filemap.c:3945 generic_file_write_iter+0xb8/0x2b4 mm/filemap.c:3977 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x610/0x91c fs/read_write.c:584 ksys_write+0x15c/0x26c fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __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:140 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:204 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 ffff0000ce4d5340 which belongs to the cache task_struct of size 6848 The buggy address is located 2480 bytes inside of 6848-byte region [ffff0000ce4d5340, ffff0000ce4d6e00) The buggy address belongs to the physical page: page:000000005e080dab refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10e4d0 head:000000005e080dab order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff0000d2b0c101 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003452000 dead000000000002 ffff0000c0858f00 raw: 0000000000000000 0000000080040004 00000001ffffffff ffff0000d2b0c101 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000ce4d5b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000ce4d5c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000ce4d5c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000ce4d5d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000ce4d5d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================