linux-kernel - Re: [s390x] New regression was found on kernel-4.16

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Message-ID: <20180409122330.GB31165@ming.t460p>
Date:   Mon, 9 Apr 2018 20:23:31 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Li Wang <liwang@...hat.com>
Cc:     Stefan Haberland <sth@...ux.vnet.ibm.com>,
        Jan Hoeppner <hoeppner@...ux.vnet.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Mikulas Patocka <mpatocka@...hat.com>,
        linux-kernel@...r.kernel.org, Xiao Ni <xni@...hat.com>
Subject: Re: [s390x] New regression was found on kernel-4.16

Hi Li Wang,

On Mon, Apr 09, 2018 at 06:18:04PM +0800, Li Wang wrote:
> Hi,
> 
> I got this BUG_ON() on s390x platform with kernel-v4.16.0.

Today I saw this bug too, from my first look, seems it is because
that get_max_io_size() returns zero in blk_bio_segment_split().

And I trigger that in one MD queue, and Xiao Ni is looking at it.

Thanks,
Ming