BTRFS info (device loop0): first mount of filesystem 14d642db-7b15-43e4-81e6-4b8fac6a25f8
BTRFS info (device loop0): using blake2b (blake2b-256-generic) checksum algorithm
BTRFS info (device loop0): using free-space-tree
BTRFS warning (device loop0): couldn't read tree root
BUG: MAX_LOCKDEP_KEYS too low!
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 18655 Comm: syz-executor294 Not tainted 6.15.0-rc5-syzkaller-gc32f8dc5aaf9 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 register_lock_class+0x310/0x348 kernel/locking/lockdep.c:1333
 __lock_acquire+0xa8/0x3058 kernel/locking/lockdep.c:5110
 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866
 touch_wq_lockdep_map+0xa8/0x164 kernel/workqueue.c:3907
 __flush_workqueue+0xfc/0x109c kernel/workqueue.c:3949
 drain_workqueue+0xa4/0x310 kernel/workqueue.c:4113
 destroy_workqueue+0xb4/0xd94 kernel/workqueue.c:5858
 btrfs_destroy_workqueue+0x48/0x2c0 fs/btrfs/async-thread.c:359
 btrfs_stop_all_workers+0x184/0x240 fs/btrfs/disk-io.c:1787
 open_ctree+0xf0c/0x229c fs/btrfs/disk-io.c:3673
 btrfs_fill_super+0x184/0x2c0 fs/btrfs/super.c:972
 btrfs_get_tree_super fs/btrfs/super.c:1897 [inline]
 btrfs_get_tree+0xc4c/0x1038 fs/btrfs/super.c:2092
 vfs_get_tree+0x90/0x28c fs/super.c:1759
 fc_mount+0x24/0xac fs/namespace.c:1293
 btrfs_get_tree_subvol fs/btrfs/super.c:2050 [inline]
 btrfs_get_tree+0x4d4/0x1038 fs/btrfs/super.c:2093
 vfs_get_tree+0x90/0x28c fs/super.c:1759
 do_new_mount+0x228/0x814 fs/namespace.c:3884
 path_mount+0x5b4/0xde0 fs/namespace.c:4211
 do_mount fs/namespace.c:4224 [inline]
 __do_sys_mount fs/namespace.c:4435 [inline]
 __se_sys_mount fs/namespace.c:4412 [inline]
 __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4412
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
BTRFS error (device loop0): open_ctree failed: -5