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Date:   Sat, 14 Nov 2020 05:50:48 +0000
From:   Al Viro <viro@zeniv.linux.org.uk>
To:     Nathan Chancellor <natechancellor@gmail.com>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Christoph Hellwig <hch@lst.de>,
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Subject: Re: [PATCH 1/6] seq_file: add seq_read_iter
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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()?