BTRFS info (device loop6): using free space tree
BTRFS info (device loop6): enabling ssd optimizations
BTRFS info (device loop6): rebuilding free space tree
BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 6778 Comm: syz.6.465 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 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+0xf8/0x160 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+0x1b40/0x6544 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662
 local_lock_acquire+0x3c/0x98 include/linux/local_lock_internal.h:29
 put_cpu_partial+0x68/0x1fc mm/slub.c:2639
 get_partial_node+0x308/0x3b8 mm/slub.c:2239
 get_partial mm/slub.c:2330 [inline]
 ___slab_alloc+0x690/0xec8 mm/slub.c:3131
 __slab_alloc+0x74/0xd0 mm/slub.c:3240
 slab_alloc_node mm/slub.c:3325 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x2a0/0x318 mm/slub.c:3383
 btrfs_add_delayed_tree_ref+0x178/0xcd0 fs/btrfs/delayed-ref.c:930
 btrfs_free_tree_block+0x254/0xa1c fs/btrfs/extent-tree.c:3298
 btrfs_force_cow_block+0xb20/0x187c fs/btrfs/ctree.c:505
 btrfs_cow_block+0x2d0/0x710 fs/btrfs/ctree.c:623
 commit_cowonly_roots+0x134/0x714 fs/btrfs/transaction.c:1289
 btrfs_commit_transaction+0x10bc/0x29f0 fs/btrfs/transaction.c:2427
 btrfs_rebuild_free_space_tree+0x2dc/0x6d4 fs/btrfs/free-space-tree.c:1347
 btrfs_start_pre_rw_mount+0x2c8/0x658 fs/btrfs/disk-io.c:3237
 open_ctree+0x1ae8/0x224c fs/btrfs/disk-io.c:3834
 btrfs_fill_super+0x1b4/0x2d4 fs/btrfs/super.c:1469
 btrfs_mount_root+0x730/0x780 fs/btrfs/super.c:1834
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632
 vfs_get_tree+0x90/0x274 fs/super.c:1573
 fc_mount fs/namespace.c:1048 [inline]
 vfs_kern_mount+0xdc/0x178 fs/namespace.c:1078
 btrfs_mount+0x2a0/0x8dc fs/btrfs/super.c:1894
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632
 vfs_get_tree+0x90/0x274 fs/super.c:1573
 do_new_mount+0x228/0x810 fs/namespace.c:3078
 path_mount+0x5b4/0xe78 fs/namespace.c:3408
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount fs/namespace.c:3606 [inline]
 __arm64_sys_mount+0x49c/0x584 fs/namespace.c:3606
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 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
BTRFS info (device loop6): last unmount of filesystem 395ef67a-297e-477c-816d-cd80a5b93e5d