BTRFS info (device loop5): disabling free space tree
BTRFS info (device loop5): clearing compat-ro feature flag for FREE_SPACE_TREE (0x1)
BTRFS info (device loop5): clearing compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2)
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 0 PID: 7773 Comm: syz.5.632 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 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:3777 [inline]
 validate_chain kernel/locking/lockdep.c:3798 [inline]
 __lock_acquire+0x1864/0x6634 kernel/locking/lockdep.c:5063
 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676
 down_read_nested+0x68/0x304 kernel/locking/rwsem.c:1645
 __btrfs_tree_read_lock+0x40/0x354 fs/btrfs/locking.c:135
 btrfs_tree_read_lock fs/btrfs/locking.c:141 [inline]
 btrfs_read_lock_root_node+0x254/0x374 fs/btrfs/locking.c:280
 btrfs_search_slot_get_root fs/btrfs/ctree.c:1721 [inline]
 btrfs_search_slot+0x4c0/0x2380 fs/btrfs/ctree.c:2047
 lookup_inline_extent_backref+0x284/0xeb8 fs/btrfs/extent-tree.c:847
 lookup_extent_backref fs/btrfs/extent-tree.c:1074 [inline]
 __btrfs_free_extent+0x22c/0x2254 fs/btrfs/extent-tree.c:2985
 run_delayed_tree_ref fs/btrfs/extent-tree.c:1696 [inline]
 run_one_delayed_ref fs/btrfs/extent-tree.c:1720 [inline]
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:1969 [inline]
 __btrfs_run_delayed_refs+0xbc4/0x3374 fs/btrfs/extent-tree.c:2033
 btrfs_run_delayed_refs+0x11c/0x474 fs/btrfs/extent-tree.c:2164
 btrfs_commit_transaction+0x1e4/0x28e4 fs/btrfs/transaction.c:2191
 btrfs_quota_enable+0xb70/0x1a74 fs/btrfs/qgroup.c:1175
 btrfs_ioctl_quota_ctl+0x13c/0x180 fs/btrfs/ioctl.c:4627
 btrfs_ioctl+0x8f4/0xb38 fs/btrfs/ioctl.c:5614
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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