BTRFS info (device loop5): enabling ssd optimizations
BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 7217 Comm: syz.5.550 Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __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:3735 [inline]
 validate_chain kernel/locking/lockdep.c:3756 [inline]
 __lock_acquire+0x1b30/0x651c kernel/locking/lockdep.c:5012
 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xc4/0x14c kernel/locking/spinlock.c:162
 __debug_check_no_obj_freed lib/debugobjects.c:962 [inline]
 debug_check_no_obj_freed+0x148/0x46c lib/debugobjects.c:1003
 slab_free_hook mm/slub.c:1680 [inline]
 slab_free_freelist_hook+0x9c/0x1e8 mm/slub.c:1731
 slab_free mm/slub.c:3499 [inline]
 kmem_cache_free+0xdc/0x3b4 mm/slub.c:3515
 add_delayed_ref_head+0x51c/0x830 fs/btrfs/delayed-ref.c:814
 btrfs_add_delayed_tree_ref+0x7b8/0xd4c fs/btrfs/delayed-ref.c:958
 btrfs_free_tree_block+0x228/0xc5c fs/btrfs/extent-tree.c:3309
 btrfs_force_cow_block+0xc3c/0x1700 fs/btrfs/ctree.c:480
 btrfs_cow_block+0x2d8/0x66c fs/btrfs/ctree.c:598
 btrfs_search_slot+0xa10/0x1f4c fs/btrfs/ctree.c:1858
 btrfs_insert_empty_items+0x1e0/0x2a8 fs/btrfs/ctree.c:4012
 btrfs_insert_delayed_item fs/btrfs/delayed-inode.c:736 [inline]
 btrfs_insert_delayed_items fs/btrfs/delayed-inode.c:783 [inline]
 __btrfs_commit_inode_delayed_items+0x668/0x125c fs/btrfs/delayed-inode.c:1041
 __btrfs_run_delayed_items+0x1ac/0x480 fs/btrfs/delayed-inode.c:1086
 btrfs_run_delayed_items+0x24/0x34 fs/btrfs/delayed-inode.c:1123
 btrfs_commit_transaction+0xdcc/0x3044 fs/btrfs/transaction.c:2340
 create_snapshot+0x3b4/0x698 fs/btrfs/ioctl.c:785
 btrfs_mksubvol+0x514/0x65c fs/btrfs/ioctl.c:935
 btrfs_mksnapshot+0xc8/0x178 fs/btrfs/ioctl.c:981
 __btrfs_ioctl_snap_create+0x394/0x478 fs/btrfs/ioctl.c:1871
 btrfs_ioctl_snap_create_v2+0x1a4/0x38c fs/btrfs/ioctl.c:1958
 btrfs_ioctl+0x9b4/0xb38 fs/btrfs/ioctl.c:-1
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584