BUG: MAX_LOCKDEP_CHAINS too low! turning off the locking correctness validator. CPU: 1 PID: 25125 Comm: kworker/u4:17 Not tainted 6.2.0-syzkaller-18302-g596b6b709632 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 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+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 lookup_chain_cache_add kernel/locking/lockdep.c:3778 [inline] validate_chain kernel/locking/lockdep.c:3799 [inline] __lock_acquire+0x1b8c/0x764c kernel/locking/lockdep.c:5055 lock_acquire+0x2e8/0x8c0 kernel/locking/lockdep.c:5668 local_lock_acquire+0x44/0x1ac include/linux/local_lock_internal.h:29 mlock_page_drain_local+0x84/0x208 mm/mlock.c:217 lru_add_drain+0x114/0x168 mm/swap.c:788 __pagevec_release+0x68/0x10c mm/swap.c:1093 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] __process_pages_contig+0x7c4/0xa58 fs/btrfs/extent_io.c:340 extent_clear_unlock_delalloc+0x90/0xa8 fs/btrfs/extent_io.c:514 compress_file_range+0x1128/0x1424 fs/btrfs/inode.c:825 async_cow_start+0x28/0x94 fs/btrfs/inode.c:1494 btrfs_work_helper+0x430/0x10ac fs/btrfs/async-thread.c:280 process_one_work+0x848/0x16b4 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x24c/0x2d4 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 ================================================================== BUG: KASAN: use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline] BUG: KASAN: use-after-free in do_raw_spin_lock+0x240/0x358 kernel/locking/spinlock_debug.c:114 Read of size 4 at addr ffff00012f2adab4 by task kworker/u4:17/25125 CPU: 1 PID: 25125 Comm: kworker/u4:17 Not tainted 6.2.0-syzkaller-18302-g596b6b709632 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 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+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:417 kasan_report+0xd4/0x130 mm/kasan/report.c:517 __asan_report_load4_noabort+0x2c/0x38 mm/kasan/report_generic.c:350 debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline] do_raw_spin_lock+0x240/0x358 kernel/locking/spinlock_debug.c:114 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline] _raw_spin_lock_irqsave+0x70/0x88 kernel/locking/spinlock.c:162 try_to_wake_up+0xb4/0xe18 kernel/sched/core.c:4152 wake_up_process+0x18/0x24 kernel/sched/core.c:4402 btrfs_add_delayed_iput+0x26c/0x2d4 fs/btrfs/inode.c:3605 async_cow_start+0x6c/0x94 fs/btrfs/inode.c:1496 btrfs_work_helper+0x430/0x10ac fs/btrfs/async-thread.c:280 process_one_work+0x848/0x16b4 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x24c/0x2d4 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 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:512 __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x80/0x478 mm/slab.h:761 slab_alloc_node mm/slub.c:3452 [inline] kmem_cache_alloc_node+0x2b0/0x3b4 mm/slub.c:3497 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct+0x74/0x7dc kernel/fork.c:979 copy_process+0x4b8/0x3774 kernel/fork.c:2097 kernel_clone+0x1d8/0xab0 kernel/fork.c:2681 kernel_thread+0x128/0x1a8 kernel/fork.c:2741 create_kthread kernel/kthread.c:399 [inline] kthreadd+0x464/0x62c kernel/kthread.c:746 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Freed by task 28647: 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:523 ____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:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3787 [inline] kmem_cache_free+0x320/0x5f0 mm/slub.c:3809 free_task_struct kernel/fork.c:176 [inline] free_task+0xe0/0x144 kernel/fork.c:562 __put_task_struct+0x180/0x218 kernel/fork.c:858 put_task_struct include/linux/sched/task.h:119 [inline] delayed_put_task_struct+0x204/0x584 kernel/exit.c:225 rcu_do_batch kernel/rcu/tree.c:2246 [inline] rcu_core+0x84c/0x1b40 kernel/rcu/tree.c:2506 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2523 __do_softirq+0x368/0xfa4 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:493 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:503 __call_rcu_common kernel/rcu/tree.c:2755 [inline] call_rcu+0x104/0xb38 kernel/rcu/tree.c:2868 put_task_struct_rcu_user+0x68/0xcc kernel/exit.c:231 finish_task_switch+0x5c4/0x624 kernel/sched/core.c:5209 context_switch kernel/sched/core.c:5299 [inline] __schedule+0xfcc/0x1d64 kernel/sched/core.c:6609 preempt_schedule_common+0xf4/0x1e8 kernel/sched/core.c:6778 preempt_schedule kernel/sched/core.c:6802 [inline] try_to_wake_up+0x628/0xe18 kernel/sched/core.c:4274 wake_up_state+0x14/0x20 kernel/sched/core.c:4408 kthread_unpark+0x174/0x204 kernel/kthread.c:636 kthread_stop+0x270/0xbc0 kernel/kthread.c:706 close_ctree+0x400/0xb30 fs/btrfs/disk-io.c:4767 btrfs_put_super+0x40/0x50 fs/btrfs/super.c:81 generic_shutdown_super+0x130/0x2f0 fs/super.c:492 kill_anon_super+0x4c/0x74 fs/super.c:1086 btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2132 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xf0/0x110 fs/super.c:363 cleanup_mnt+0x394/0x41c fs/namespace.c:1291 __cleanup_mnt+0x20/0x30 fs/namespace.c:1298 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+0x2180/0x3c90 arch/arm64/kernel/signal.c:1302 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+0x190/0x194 arch/arm64/kernel/entry.S:591 The buggy address belongs to the object at ffff00012f2ad1c0 which belongs to the cache task_struct of size 6720 The buggy address is located 2292 bytes inside of 6720-byte region [ffff00012f2ad1c0, ffff00012f2aec00) The buggy address belongs to the physical page: page:000000005e8a2196 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16f2a8 head:000000005e8a2196 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 memcg:ffff0000cb49a201 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 ffff0000c0842f00 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff0000cb49a201 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00012f2ad980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00012f2ada00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff00012f2ada80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff00012f2adb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00012f2adb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================