BUG: MAX_LOCKDEP_CHAINS too low! turning off the locking correctness validator. CPU: 1 PID: 12274 Comm: kworker/u4:27 Not tainted 6.7.0-rc8-syzkaller-g0802e17d9aca #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: btrfs-delalloc btrfs_work_helper Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298 __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:3816 [inline] validate_chain kernel/locking/lockdep.c:3837 [inline] __lock_acquire+0x1c58/0x763c kernel/locking/lockdep.c:5137 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5754 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:518 [inline] try_to_wake_up+0xb0/0xf50 kernel/sched/core.c:4226 wake_up_state+0x14/0x20 kernel/sched/core.c:4480 wake_page_function+0x128/0x394 mm/filemap.c:1115 __wake_up_common kernel/sched/wait.c:89 [inline] __wake_up_locked_key+0x100/0x174 kernel/sched/wait.c:147 folio_wake_bit+0x108/0x290 mm/filemap.c:1142 folio_unlock+0xe4/0x164 mm/filemap.c:1475 unlock_page+0x58/0x74 mm/folio-compat.c:21 btrfs_page_unlock_writer+0x2c8/0x558 extent_write_locked_range+0x5f0/0xa24 fs/btrfs/extent_io.c:2204 run_delalloc_cow+0x13c/0x1d8 fs/btrfs/inode.c:1719 submit_uncompressed_range fs/btrfs/inode.c:1077 [inline] submit_one_async_extent fs/btrfs/inode.c:1128 [inline] submit_compressed_extents+0xaa4/0x1660 fs/btrfs/inode.c:1604 run_ordered_work fs/btrfs/async-thread.c:246 [inline] btrfs_work_helper+0x50c/0x14f8 fs/btrfs/async-thread.c:325 process_one_work+0x694/0x1204 kernel/workqueue.c:2627 process_scheduled_works kernel/workqueue.c:2700 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2781 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 ================================================================== BUG: KASAN: slab-use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline] BUG: KASAN: slab-use-after-free in do_raw_spin_lock+0x234/0x348 kernel/locking/spinlock_debug.c:114 Read of size 4 at addr ffff00012869c57c by task kworker/u4:27/12274 CPU: 1 PID: 12274 Comm: kworker/u4:27 Not tainted 6.7.0-rc8-syzkaller-g0802e17d9aca #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: btrfs-delalloc btrfs_work_helper Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298 __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:364 [inline] print_report+0x174/0x514 mm/kasan/report.c:475 kasan_report+0xd8/0x138 mm/kasan/report.c:588 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380 debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline] do_raw_spin_lock+0x234/0x348 kernel/locking/spinlock_debug.c:114 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline] _raw_spin_lock_irqsave+0x64/0x7c kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:518 [inline] try_to_wake_up+0xb0/0xf50 kernel/sched/core.c:4226 wake_up_process+0x18/0x24 kernel/sched/core.c:4474 btrfs_add_delayed_iput+0x268/0x2d8 fs/btrfs/inode.c:3345 submit_compressed_extents+0xd8/0x1660 fs/btrfs/inode.c:1587 run_ordered_work fs/btrfs/async-thread.c:289 [inline] btrfs_work_helper+0xcb8/0x14f8 fs/btrfs/async-thread.c:325 process_one_work+0x694/0x1204 kernel/workqueue.c:2627 process_scheduled_works kernel/workqueue.c:2700 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2781 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 Allocated by task 2: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:511 __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x90/0x498 mm/slab.h:763 slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x2b4/0x458 mm/slub.c:3523 alloc_task_struct_node kernel/fork.c:173 [inline] dup_task_struct+0x74/0x888 kernel/fork.c:1110 copy_process+0x488/0x3478 kernel/fork.c:2332 kernel_clone+0x1d8/0x80c kernel/fork.c:2907 kernel_thread+0x184/0x200 kernel/fork.c:2969 create_kthread kernel/kthread.c:411 [inline] kthreadd+0x464/0x670 kernel/kthread.c:764 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 Freed by task 14913: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:522 ____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:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook mm/slub.c:1826 [inline] slab_free mm/slub.c:3809 [inline] kmem_cache_free+0x2e4/0x56c mm/slub.c:3831 free_task_struct kernel/fork.c:178 [inline] free_task+0xe8/0x14c kernel/fork.c:627 __put_task_struct+0x178/0x210 kernel/fork.c:981 put_task_struct+0x88/0x10c include/linux/sched/task.h:136 delayed_put_task_struct+0xdc/0x2d8 kernel/exit.c:227 rcu_do_batch kernel/rcu/tree.c:2158 [inline] rcu_core+0x890/0x1b34 kernel/rcu/tree.c:2431 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2448 __do_softirq+0x2d8/0xce4 kernel/softirq.c:553 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:492 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:502 __call_rcu_common kernel/rcu/tree.c:2681 [inline] call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2795 put_task_struct_rcu_user+0x70/0xd8 kernel/exit.c:233 finish_task_switch+0x5b4/0x614 kernel/sched/core.c:5285 context_switch kernel/sched/core.c:5379 [inline] __schedule+0x1358/0x2360 kernel/sched/core.c:6688 __schedule_loop kernel/sched/core.c:6763 [inline] schedule+0xb8/0x19c kernel/sched/core.c:6778 do_notify_resume+0x1cc/0x393c arch/arm64/kernel/signal.c:1288 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline] el0_interrupt+0xb8/0x234 arch/arm64/kernel/entry-common.c:763 __el0_irq_handler_common+0x18/0x24 arch/arm64/kernel/entry-common.c:768 el0t_64_irq_handler+0x10/0x1c arch/arm64/kernel/entry-common.c:773 el0t_64_irq+0x190/0x194 arch/arm64/kernel/entry.S:596 Second to last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:492 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:502 __call_rcu_common kernel/rcu/tree.c:2681 [inline] call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2795 put_task_struct_rcu_user+0x70/0xd8 kernel/exit.c:233 finish_task_switch+0x5b4/0x614 kernel/sched/core.c:5285 context_switch kernel/sched/core.c:5379 [inline] __schedule+0x1358/0x2360 kernel/sched/core.c:6688 __schedule_loop kernel/sched/core.c:6763 [inline] schedule+0xb8/0x19c kernel/sched/core.c:6778 schedule_timeout+0xb8/0x348 kernel/time/timer.c:2143 do_wait_for_common+0x30c/0x468 kernel/sched/completion.c:95 __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:148 kthread_stop+0x1b4/0x704 kernel/kthread.c:709 destroy_workqueue+0x124/0xdc4 kernel/workqueue.c:4812 btrfs_destroy_workqueue+0x48/0x2f0 fs/btrfs/async-thread.c:361 btrfs_stop_all_workers+0x1c0/0x240 fs/btrfs/disk-io.c:1767 close_ctree+0x598/0xdec fs/btrfs/disk-io.c:4374 btrfs_put_super+0x70/0x80 fs/btrfs/super.c:86 generic_shutdown_super+0x130/0x2b8 fs/super.c:696 kill_anon_super+0x4c/0x7c fs/super.c:1295 btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2100 deactivate_locked_super+0xc4/0x144 fs/super.c:484 deactivate_super+0xe0/0x100 fs/super.c:517 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1256 __cleanup_mnt+0x20/0x30 fs/namespace.c:1263 task_work_run+0x230/0x2e0 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x214c/0x393c arch/arm64/kernel/signal.c:1305 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline] el0_svc+0x9c/0x158 arch/arm64/kernel/entry-common.c:679 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 The buggy address belongs to the object at ffff00012869bc00 which belongs to the cache task_struct of size 7424 The buggy address is located 2428 bytes inside of freed 7424-byte region [ffff00012869bc00, ffff00012869d900) The buggy address belongs to the physical page: page:00000000dd47d65e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x168698 head:00000000dd47d65e order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff0000c2a0b541 flags: 0x5ffc00000000840(slab|head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 05ffc00000000840 ffff0000c1863500 fffffc0003301400 dead000000000002 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff0000c2a0b541 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00012869c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00012869c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff00012869c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff00012869c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00012869c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================