BTRFS info (device loop7): last unmount of filesystem 34a2da50-e117-4d40-8878-8e0fb0127b5f
BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 PID: 16141 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
 dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 add_chain_cache kernel/locking/lockdep.c:-1 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3772 [inline]
 validate_chain kernel/locking/lockdep.c:3793 [inline]
 __lock_acquire+0x1864/0x6800 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x6c/0xb0 kernel/locking/spinlock.c:162
 fill_pool lib/debugobjects.c:176 [inline]
 debug_objects_fill_pool+0x4f0/0x5d8 lib/debugobjects.c:607
 debug_object_activate+0x4c/0x4b8 lib/debugobjects.c:694
 debug_rcu_head_queue kernel/rcu/rcu.h:190 [inline]
 call_rcu+0x54/0x94c kernel/rcu/tree.c:2834
 xa_node_free lib/xarray.c:260 [inline]
 xas_delete_node lib/xarray.c:497 [inline]
 update_node lib/xarray.c:761 [inline]
 xas_store+0xba4/0x14e4 lib/xarray.c:846
 page_cache_delete mm/filemap.c:140 [inline]
 __filemap_remove_folio+0x394/0x4f8 mm/filemap.c:223
 __remove_mapping+0x5cc/0x838 mm/vmscan.c:1390
 remove_mapping+0x38/0x1e0 mm/vmscan.c:1423
 mapping_evict_folio+0x1bc/0x264 mm/truncate.c:306
 invalidate_mapping_pagevec+0x2c0/0x50c mm/truncate.c:552
 invalidate_mapping_pages+0x38/0x4c mm/truncate.c:591
 invalidate_bdev+0xa4/0xc0 block/bdev.c:87
 btrfs_close_bdev fs/btrfs/volumes.c:1160 [inline]
 btrfs_close_one_device fs/btrfs/volumes.c:1184 [inline]
 close_fs_devices+0x3d4/0x7fc fs/btrfs/volumes.c:1226
 btrfs_close_devices+0xd0/0x448 fs/btrfs/volumes.c:1241
 close_ctree+0x628/0xa94 fs/btrfs/disk-io.c:4790
 btrfs_put_super+0x70/0x80 fs/btrfs/super.c:397
 generic_shutdown_super+0x130/0x324 fs/super.c:501
 kill_anon_super+0x4c/0x80 fs/super.c:1128
 btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2448
 deactivate_locked_super+0xac/0x120 fs/super.c:332
 deactivate_super+0xe4/0x104 fs/super.c:363
 cleanup_mnt+0x390/0x418 fs/namespace.c:1191
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1198
 task_work_run+0x1ec/0x278 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x1fa0/0x2aa4 arch/arm64/kernel/signal.c:1151
 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+0x98/0x128 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
ocfs2: Unmounting device (7,7) on (node local)