EXT4-fs (loop6): VFS: Found ext4 filesystem with unknown checksum algorithm.
loop6: detected capacity change from 0 to 2048
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 PID: 6894 Comm: syz.6.350 Not tainted 6.1.118-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 lookup_chain_cache_add kernel/locking/lockdep.c:3772 [inline]
 validate_chain kernel/locking/lockdep.c:3793 [inline]
 __lock_acquire+0x1b88/0x7680 kernel/locking/lockdep.c:5049
 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
 do_write_seqcount_begin_nested include/linux/seqlock.h:515 [inline]
 do_write_seqcount_begin include/linux/seqlock.h:541 [inline]
 psi_group_change+0x278/0x134c kernel/sched/psi.c:801
 psi_task_change+0xf4/0x228 kernel/sched/psi.c:924
 psi_enqueue kernel/sched/stats.h:145 [inline]
 enqueue_task kernel/sched/core.c:2052 [inline]
 activate_task+0x268/0x2d0 kernel/sched/core.c:2084
 ttwu_do_activate+0x150/0x25c kernel/sched/core.c:3696
 ttwu_queue kernel/sched/core.c:3901 [inline]
 try_to_wake_up+0x514/0xe60 kernel/sched/core.c:4224
 wake_up_process+0x18/0x24 kernel/sched/core.c:4358
 wake_up_worker kernel/workqueue.c:859 [inline]
 insert_work+0x2ac/0x384 kernel/workqueue.c:1369
 __queue_work+0xd48/0x136c kernel/workqueue.c:1520
 queue_work_on+0xc0/0x16c kernel/workqueue.c:1548
 queue_work include/linux/workqueue.h:512 [inline]
 loop_queue_work drivers/block/loop.c:892 [inline]
 loop_queue_rq+0x978/0xae0 drivers/block/loop.c:1873
 __blk_mq_issue_directly block/blk-mq.c:2625 [inline]
 __blk_mq_try_issue_directly+0x42c/0x684 block/blk-mq.c:2678
 blk_mq_try_issue_directly+0x3c/0x1d8 block/blk-mq.c:2702
 blk_mq_submit_bio+0x1088/0x1d08 block/blk-mq.c:3039
 __submit_bio+0x214/0x2a0 block/blk-core.c:591
 __submit_bio_noacct_mq block/blk-core.c:668 [inline]
 submit_bio_noacct_nocheck+0x794/0xbf8 block/blk-core.c:697
 submit_bio_noacct+0xce8/0x1728 block/blk-core.c:792
 submit_bio+0x2c0/0x45c block/blk-core.c:837
 submit_bh_wbc+0x398/0x468 fs/buffer.c:2702
 submit_bh+0x2c/0x3c fs/buffer.c:2707
 nilfs_mdt_submit_block+0x3b0/0xa28 fs/nilfs2/mdt.c:151
 nilfs_mdt_read_block+0xe4/0x3d8 fs/nilfs2/mdt.c:176
 nilfs_mdt_get_block+0x120/0xc48 fs/nilfs2/mdt.c:251
 nilfs_cpfile_get_header_block fs/nilfs2/cpfile.c:131 [inline]
 nilfs_cpfile_get_checkpoint+0x1ac/0x99c fs/nilfs2/cpfile.c:232
 nilfs_attach_checkpoint+0x1b8/0x428 fs/nilfs2/super.c:559
 nilfs_fill_super+0x2ac/0x540 fs/nilfs2/super.c:1095
 nilfs_mount+0x598/0x82c fs/nilfs2/super.c:1347
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:632
 vfs_get_tree+0x90/0x274 fs/super.c:1573
 do_new_mount+0x278/0x8fc fs/namespace.c:3056
 path_mount+0x590/0xe5c fs/namespace.c:3386
 do_mount fs/namespace.c:3399 [inline]
 __do_sys_mount fs/namespace.c:3607 [inline]
 __se_sys_mount fs/namespace.c:3584 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3584
 __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+0x58/0x168 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
NILFS (loop6): error -4 creating segctord thread