linux-kernel - Re: scsi-mq V2

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Date:	Thu, 10 Jul 2014 11:11:10 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Benjamin LaHaise <bcrl@...ck.org>
Cc:	"Elliott\, Robert \(Server Storage\)" <Elliott@...com>,
	Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@...radead.org>,
	"dgilbert\@interlog.com" <dgilbert@...erlog.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Bart Van Assche <bvanassche@...ionio.com>,
	"linux-scsi\@vger.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: scsi-mq V2

Benjamin LaHaise <bcrl@...ck.org> writes:

>> 
>> [  186.339064] ioctx_alloc: nr_events=-2 aio_max_nr=65536
>> [  186.339065] ioctx_alloc: nr_events=-2 aio_max_nr=65536
>> [  186.339067] ioctx_alloc: nr_events=-2 aio_max_nr=65536
>> [  186.339068] ioctx_alloc: nr_events=-2 aio_max_nr=65536
>> [  186.339069] ioctx_alloc: nr_events=-2 aio_max_nr=65536
>
> Something is horribly wrong here.  There is no way that value for nr_events 
> should be passed in to ioctx_alloc().  This implies that userland is calling 
> io_setup() with an impossibly large value for nr_events.  Can you post the 
> actual diff for your fs/aio.c relative to linus' tree?
>

fio does exactly this!  it passes INT_MAX.

Cheers,
Jeff
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