Quota error (device loop7): dq_insert_tree: Quota tree root isn't allocated!
Quota error (device loop7): qtree_write_dquot: Error -5 occurred while creating quota
EXT4-fs error (device loop7): ext4_acquire_dquot:6809: comm syz.7.381: Failed to acquire dquot type 0
BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 6773 Comm: syz.7.381 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
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x54/0x6c kernel/locking/spinlock.c:154
 rcu_note_context_switch+0x28c/0x1064 kernel/rcu/tree_plugin.h:326
 __schedule+0x2a4/0x1b18 kernel/sched/core.c:6460
 preempt_schedule_common+0xec/0x1a0 kernel/sched/core.c:6730
 preempt_schedule+0x64/0x84 kernel/sched/core.c:6754
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
 _raw_spin_unlock_irq+0x8c/0x90 kernel/locking/spinlock.c:202
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 loop_queue_work drivers/block/loop.c:894 [inline]
 loop_queue_rq+0x954/0xa80 drivers/block/loop.c:1874
 __blk_mq_issue_directly block/blk-mq.c:2631 [inline]
 __blk_mq_try_issue_directly+0x410/0x67c block/blk-mq.c:2684
 blk_mq_try_issue_directly+0x3c/0x1d8 block/blk-mq.c:2708
 blk_mq_submit_bio+0xf88/0x1a48 block/blk-mq.c:3045
 __submit_bio+0x1d8/0x260 block/blk-core.c:591
 __submit_bio_noacct_mq block/blk-core.c:668 [inline]
 submit_bio_noacct_nocheck+0x67c/0x9ec block/blk-core.c:697
 submit_bio_noacct+0xcdc/0x16e0 block/blk-core.c:808
 submit_bio+0x29c/0x3d0 block/blk-core.c:853
 submit_bh_wbc+0x384/0x454 fs/buffer.c:2702
 submit_bh+0x2c/0x3c fs/buffer.c:2707
 __ext4_read_bh fs/ext4/super.c:174 [inline]
 ext4_read_bh_nowait+0x160/0x1f4 fs/ext4/super.c:186
 ext4_read_block_bitmap_nowait+0x5cc/0x8c0 fs/ext4/balloc.c:543
 ext4_read_block_bitmap+0x30/0xd4 fs/ext4/balloc.c:589
 ext4_mb_clear_bb fs/ext4/mballoc.c:6022 [inline]
 ext4_free_blocks+0xbb8/0x23cc fs/ext4/mballoc.c:6268
 ext4_remove_blocks fs/ext4/extents.c:2526 [inline]
 ext4_ext_rm_leaf fs/ext4/extents.c:2692 [inline]
 ext4_ext_remove_space+0x1698/0x39c4 fs/ext4/extents.c:2940
 ext4_ext_truncate+0x164/0x20c fs/ext4/extents.c:4470
 ext4_truncate+0x9dc/0x1078 fs/ext4/inode.c:4295
 ext4_process_orphan+0x17c/0x2b4 fs/ext4/orphan.c:335
 ext4_orphan_cleanup+0x908/0x104c fs/ext4/orphan.c:470
 __ext4_fill_super fs/ext4/super.c:5530 [inline]
 ext4_fill_super+0x6440/0x68a8 fs/ext4/super.c:5661
 get_tree_bdev+0x358/0x544 fs/super.c:1366
 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5691
 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
EXT4-fs error (device loop7): ext4_validate_block_bitmap:438: comm syz.7.381: bg 0: block 64: padding at end of block bitmap is not set
EXT4-fs error (device loop7) in ext4_mb_clear_bb:6165: Corrupt filesystem
EXT4-fs (loop7): 1 truncate cleaned up
EXT4-fs (loop7): mounted filesystem without journal. Quota mode: writeback.