On Fri, Jul 18, 2025 at 12:32:46AM +0900, Tetsuo Handa wrote: > +++ b/fs/hfs/inode.c > @@ -81,7 +81,8 @@ static bool hfs_release_folio(struct folio *folio, gfp_t mask) > tree = HFS_SB(sb)->cat_tree; > break; > default: > - BUG(); > + pr_err("detected unknown inode %lu, running fsck.hfs is recommended.\n", > + inode->i_ino); As I asked the first time, how can we get here? In order to release a folio, we have to first populate the pagecache of the inode with folios. How did we manage to do that for an inode with a bogus i_ino? > @@ -441,7 +442,8 @@ int hfs_write_inode(struct inode *inode, struct writeback_control *wbc) > hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree); > return 0; > default: > - BUG(); > + pr_err("detected unknown inode %lu, running fsck.hfs is recommended.\n", > + inode->i_ino); Similarly here, how did we manage to mark a bad inode as dirty?