Re: [PATCH 1/6] seq_file: add seq_read_iter

[Al Viro]

On Fri, Nov 13, 2020 at 09:14:20PM -0700, Nathan Chancellor wrote:

> Unfortunately that patch does not solve my issue. Is there any other
> debugging I should add?

Hmm...  I wonder which file it is; how about
		if (WARN_ON(!iovec.iov_len))
			printk(KERN_ERR "odd readv on %pd4\n", file);
in the loop in fs/read_write.c:do_loop_readv_writev()?