BTRFS info (device loop9): first mount of filesystem 5e4b7888-5e56-43f0-8345-635ad0fd87c6
BTRFS info (device loop9): using blake2b (blake2b-256-generic) checksum algorithm
BTRFS info (device loop9): using free space tree
BTRFS info (device loop9): enabling ssd optimizations
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 0 PID: 8941 Comm: syz.9.705 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
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:3772 [inline]
 validate_chain kernel/locking/lockdep.c:3793 [inline]
 __lock_acquire+0x1810/0x6610 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x638 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
 debug_object_activate+0x80/0x4c0 lib/debugobjects.c:698
 debug_work_activate kernel/workqueue.c:510 [inline]
 __queue_work+0xcec/0x1280 kernel/workqueue.c:1519
 queue_work_on+0xc0/0x164 kernel/workqueue.c:1548
 queue_work include/linux/workqueue.h:512 [inline]
 btrfs_queue_work+0x260/0x4bc fs/btrfs/async-thread.c:320
 btrfs_cache_block_group+0x430/0x65c fs/btrfs/block-group.c:820
 find_free_extent+0x2b7c/0x49cc fs/btrfs/extent-tree.c:4447
 btrfs_reserve_extent+0x254/0x534 fs/btrfs/extent-tree.c:4621
 btrfs_alloc_tree_block+0x190/0x1178 fs/btrfs/extent-tree.c:5034
 btrfs_force_cow_block+0x3ac/0x18c0 fs/btrfs/ctree.c:450
 btrfs_cow_block+0x2e0/0x71c fs/btrfs/ctree.c:623
 btrfs_search_slot+0xa48/0x2380 fs/btrfs/ctree.c:-1
 btrfs_lookup_match_dir fs/btrfs/dir-item.c:181 [inline]
 btrfs_lookup_xattr+0xfc/0x1d4 fs/btrfs/dir-item.c:363
 btrfs_setxattr+0x1f4/0x6e8 fs/btrfs/xattr.c:100
 btrfs_setxattr_trans+0xfc/0x2e8 fs/btrfs/xattr.c:258
 btrfs_xattr_handler_set+0xb0/0xd8 fs/btrfs/xattr.c:378
 __vfs_removexattr+0x364/0x380 fs/xattr.c:479
 __vfs_removexattr_locked+0x1d0/0x208 fs/xattr.c:514
 vfs_removexattr+0x80/0x18c fs/xattr.c:536
 removexattr fs/xattr.c:878 [inline]
 path_removexattr+0x1b8/0x390 fs/xattr.c:892
 __do_sys_removexattr fs/xattr.c:906 [inline]
 __se_sys_removexattr fs/xattr.c:903 [inline]
 __arm64_sys_removexattr+0x60/0x78 fs/xattr.c:903
 __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