On Mon, Sep 30, 2024 at 11:02:26AM +0200, Gianfranco Trad wrote: > @@ -2360,6 +2360,8 @@ static int filemap_read_folio(struct file *file, filler_t filler, > /* Start the actual read. The read will unlock the page. */ > if (unlikely(workingset)) > psi_memstall_enter(&pflags); > + if (!filler) > + return -EIO; This is definitely wrong because you enter memstall, but do not exit it. As Andrew says, the underlying problem is that the filesystem does not implement ->read_folio. Which filesystem is this? > error = filler(file, folio); > if (unlikely(workingset)) > psi_memstall_leave(&pflags); > -- > 2.43.0 >
