From mboxrd@z Thu Jan  1 00:00:00 1970
From: hch@lst.de (Christoph Hellwig)
Date: Tue, 14 May 2019 16:14:39 +0200
Subject: PROBLEM: call trace triggered in 5.1.1 in
 drivers/nvme/host/pci.c, 5.0.11 ok
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On Tue, May 14, 2019@10:12:22PM +0800, Ming Lei wrote:
> The two aren't merged because the default segment size(BLK_MAX_SEGMENT_SIZE) is 64KB,

Yep.

> and the following patch may fix this issue:

Or this one posted yesterday for that matter:

https://marc.info/?l=linux-block&m=155772952511144&w=2