linux-kernel - Re: IO errors after "block: remove bio_get_nr

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Message-ID: <37aeccfa37bb49823a62ae24be554a5a@lycos.com>
Date:	Mon, 21 Dec 2015 04:25:12 +0500
From:	"Artem S. Tashkinov" <t.artem@...os.com>
To:	Christoph Hellwig <hch@....de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Ming Lin <ming.l@....samsung.com>, Jens Axboe <axboe@...com>,
	"Artem S. Tashkinov" <t.artem@...lcity.com>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Tejun Heo <tj@...nel.org>, IDE-ML <linux-ide@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: IO errors after "block: remove bio_get_nr_vecs()"

On 2015-12-20 23:18, Christoph Hellwig wrote:
> On Sun, Dec 20, 2015 at 09:51:14AM -0800, Linus Torvalds wrote:
>> Kent, Jens, Christoph et al,
>>  please see this bugzilla:
>> 
>>   https://bugzilla.kernel.org/show_bug.cgi?id=109661
>> 
>> where Artem Tashkinov bisected his problems with 4.3 down to commit
>> b54ffb73cadc ("block: remove bio_get_nr_vecs()") that you've all
>> signed off on.
> 
> Artem,
> 
> can you re-check the commits around this series again?  I would be
> extremtly surprised if it's really this particular commit and not
> one just before it causing the problem - it just allocates bios
> to the biggest possible instead of only allocating up to what
> bio_add_page would accept.

I'm positive about this particular commit. Of course, it might be 
another
GCC 4.7.4 miscompilation which causes the errors which shouldn't be 
there but
I'm not an expert, so.
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