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Date: Thu, 13 Apr 2017 21:44:58 +0800
From: Ming Lei <ming.lei@redhat.com>
To: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Jens Axboe <axboe@fb.com>, Omar Sandoval <osandov@osandov.com>,
        Bart Van Assche <Bart.VanAssche@sandisk.com>,
        Hannes Reinecke <hare@suse.de>, Christoph Hellwig <hch@lst.de>,
        Linux Block Layer Mailinglist <linux-block@vger.kernel.org>,
        Linux Kernel Mailinglist <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] block: bios with an offset are always gappy
Message-ID: <20170413134457.GC32362@ming.t460p>
References: <20170413080629.7610-1-jthumshirn@suse.de>
 <20170413100110.GB5964@ming.t460p>
 <20170413115328.GH6734@linux-x5ow.site>
 <20170413121134.GA32362@ming.t460p>
 <20170413122010.GJ6734@linux-x5ow.site>
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On Thu, Apr 13, 2017 at 02:20:10PM +0200, Johannes Thumshirn wrote:
> On Thu, Apr 13, 2017 at 08:11:40PM +0800, Ming Lei wrote:
> > Ok, could you apply the attached debug patch and collect the
> > ftrace log? (ftrace_dump_on_oops need to be passed to kernel cmd line).
>

Thanks Johannes very much for collecting the log.

The root cause should be the following:

	- if 'offset' of one segment isn't zero, we can't make that segment
	  at full size, otherwise the segment ends in the unaligned
	  virt boundary.

Give me a while, I will figure out one patch to address the issue.


Thanks,
Ming