BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 UID: 0 PID: 9686 Comm: syz.1.1074 Tainted: G   M         L      syzkaller #0 PREEMPT 
Tainted: [M]=MACHINE_CHECK, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 add_chain_cache kernel/locking/lockdep.c:-1 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3899 [inline]
 validate_chain kernel/locking/lockdep.c:3920 [inline]
 __lock_acquire+0xed4/0x2b08 kernel/locking/lockdep.c:5288
 lock_acquire+0x13c/0x320 kernel/locking/lockdep.c:5942
 do_write_seqcount_begin_nested include/linux/seqlock.h:478 [inline]
 do_write_seqcount_begin include/linux/seqlock.h:504 [inline]
 psi_write_begin kernel/sched/psi.c:183 [inline]
 psi_task_switch+0x154/0x660 kernel/sched/psi.c:928
 psi_sched_switch kernel/sched/stats.h:218 [inline]
 __schedule+0x2330/0x2b50 kernel/sched/core.c:7376
 preempt_schedule_common+0xd4/0x190 kernel/sched/core.c:7561
 preempt_schedule+0x60/0x78 kernel/sched/core.c:7585
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:220 [inline]
 _raw_spin_unlock_irq+0x7c/0x80 kernel/locking/spinlock.c:229
 spin_unlock_irq include/linux/spinlock.h:413 [inline]
 loop_queue_work drivers/block/loop.c:770 [inline]
 loop_queue_rq+0x8ec/0xa08 drivers/block/loop.c:1811
 __blk_mq_issue_directly+0xfc/0x298 block/blk-mq.c:2718
 blk_mq_request_issue_directly+0xe0/0x164 block/blk-mq.c:2805
 blk_mq_issue_direct+0x160/0x260 block/blk-mq.c:2826
 blk_mq_dispatch_queue_requests+0x5c4/0x6d4 block/blk-mq.c:2901
 blk_mq_flush_plug_list+0x37c/0x494 block/blk-mq.c:2984
 __blk_flush_plug+0x364/0x440 block/blk-core.c:1274
 blk_finish_plug+0x68/0x90 block/blk-core.c:1301
 ext4_do_writepages+0x3120/0x3618 fs/ext4/inode.c:3132
 ext4_writepages+0x198/0x2dc fs/ext4/inode.c:3171
 do_writepages+0x284/0x47c mm/page-writeback.c:2560
 filemap_writeback+0x230/0x2bc mm/filemap.c:387
 filemap_fdatawrite_range mm/filemap.c:412 [inline]
 file_write_and_wait_range+0xb0/0x138 mm/filemap.c:786
 ext4_sync_file+0x214/0xad8 fs/ext4/fsync.c:145
 vfs_fsync_range+0x120/0x140 fs/sync.c:186
 generic_write_sync include/linux/fs.h:2695 [inline]
 ext4_buffered_write_iter+0x350/0x438 fs/ext4/file.c:378
 ext4_file_write_iter+0x1f4/0x1478 fs/ext4/file.c:-1
 iter_file_splice_write+0x750/0xd50 fs/splice.c:736
 do_splice_from fs/splice.c:936 [inline]
 direct_splice_actor+0xec/0x150 fs/splice.c:1187
 splice_direct_to_actor+0x2a0/0x7a8 fs/splice.c:1096
 do_splice_direct_actor+0x140/0x228 fs/splice.c:1230
 do_splice_direct+0x58/0x70 fs/splice.c:1256
 ovl_copy_up_file+0x42c/0x604 fs/overlayfs/copy_up.c:347
 ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:877 [inline]
 ovl_do_copy_up fs/overlayfs/copy_up.c:1001 [inline]
 ovl_copy_up_one fs/overlayfs/copy_up.c:1221 [inline]
 ovl_copy_up_flags+0xf8c/0x26ac fs/overlayfs/copy_up.c:1275
 ovl_copy_up+0x24/0x34 fs/overlayfs/copy_up.c:1314
 ovl_xattr_set+0x288/0x48c fs/overlayfs/xattrs.c:54
 ovl_own_xattr_set+0x9c/0xcc fs/overlayfs/xattrs.c:205
 __vfs_setxattr+0x130/0x17c fs/xattr.c:223
 __vfs_setxattr_noperm+0x120/0x5cc fs/xattr.c:257
 __vfs_setxattr_locked+0x114/0x294 fs/xattr.c:318
 vfs_setxattr+0x140/0x2e4 fs/xattr.c:344
 do_setxattr+0x100/0x19c fs/xattr.c:662
 filename_setxattr+0x134/0x1f8 fs/xattr.c:690
 path_setxattrat+0x200/0x2a8 fs/xattr.c:734
 __do_sys_setxattr fs/xattr.c:768 [inline]
 __se_sys_setxattr fs/xattr.c:764 [inline]
 __arm64_sys_setxattr+0xd0/0xec fs/xattr.c:764
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:797
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:816
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606
EXT4-fs error (device loop1): __ext4_add_entry:2414: inode #12: comm syz.1.1074: Directory hole found for htree leaf block 0
EXT4-fs (loop1): Remounting filesystem read-only
overlay: filesystem on ./file0 not supported as upperdir