BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 PID: 7258 Comm: kworker/u4:20 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
Workqueue: btrfs-qgroup-rescan btrfs_work_helper
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:3844 [inline]
 validate_chain kernel/locking/lockdep.c:3865 [inline]
 __lock_acquire+0x2618/0x7280 kernel/locking/lockdep.c:5171
 lock_acquire+0x210/0x63c kernel/locking/lockdep.c:5790
 __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+0x78/0x4c0 lib/debugobjects.c:747
 debug_work_activate kernel/workqueue.c:510 [inline]
 __queue_work+0xcec/0x1280 kernel/workqueue.c:1519
 __queue_delayed_work kernel/workqueue.c:1668 [inline]
 mod_delayed_work_on+0x1c0/0x2cc kernel/workqueue.c:1742
 kblockd_mod_delayed_work_on+0x3c/0x54 block/blk-core.c:1074
 blk_mq_kick_requeue_list block/blk-mq.c:1510 [inline]
 blk_mq_add_to_requeue_list+0x208/0x270 block/blk-mq.c:1505
 blk_flush_queue_rq block/blk-flush.c:143 [inline]
 blk_kick_flush block/blk-flush.c:355 [inline]
 blk_flush_complete_seq+0x84c/0xa44 block/blk-flush.c:217
 blk_insert_flush+0x2e4/0x3bc block/blk-flush.c:451
 blk_mq_submit_bio+0xb90/0x1ad8 block/blk-mq.c:3046
 __submit_bio+0x1d8/0x260 block/blk-core.c:591
 __submit_bio_noacct_mq block/blk-core.c:668 [inline]
 submit_bio_noacct_nocheck+0x65c/0xa1c block/blk-core.c:697
 submit_bio_noacct+0xc5c/0x1660 block/blk-core.c:808
 submit_bio+0x29c/0x3d0 block/blk-core.c:853
 write_dev_flush fs/btrfs/disk-io.c:4200 [inline]
 barrier_all_devices fs/btrfs/disk-io.c:4250 [inline]
 write_all_supers+0x1430/0x36c0 fs/btrfs/disk-io.c:4345
 btrfs_commit_transaction+0x18f4/0x28e4 fs/btrfs/transaction.c:2532
 btrfs_qgroup_rescan_worker+0x14cc/0x156c fs/btrfs/qgroup.c:3423
 btrfs_work_helper+0x328/0xcbc fs/btrfs/async-thread.c:280
 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292
 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
BTRFS info (device loop9): qgroup scan completed (inconsistency flag cleared)