linux-kernel - Re: IDE Floppy support for IOMEGA Zip Drive broken in 3.16 -> 3.17 transition

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Message-ID: <20150820080846.GA11599@infradead.org>
Date:	Thu, 20 Aug 2015 01:08:46 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Sergio Callegari <sergio.callegari@...il.com>
Cc:	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org
Subject: Re: IDE Floppy support for IOMEGA Zip Drive broken in 3.16 -> 3.17
 transition

Hi Sergio,

On Tue, Aug 18, 2015 at 09:44:28AM +0200, Sergio Callegari wrote:
> Hi,
> 
> I have bisected the issue down to
> 
> [045065d8a300a37218c548e9aa7becd581c6a0e8] [SCSI] fix qemu boot hang problem
> 
> Bisecting has been a painful job due to the fact that the bug may show only
> many hours after the system boot.
> 
> The commit above in fact is not the culprit, but a fix to an issue that was
> hiding the real bug on my system.  See
> 
> http://marc.info/?l=linux-kernel&m=143973820612978&w=2
> 
> The real issue is with sata host lock and seems to be biting a few other
> people as well
> 
> https://bbs.archlinux.org/viewtopic.php?id=189324
> 
> A patch fixing the issue was sent to the LKML back in Nov 2014 by Christoph
> Hellwig (who is reading in CC)
> 
> https://lkml.org/lkml/2014/11/20/581
> 
> I have tested the patch and it works for me.
> 
> What is expected to happen now?

As mentioned in that thread we need more input from the libata people
on what kind of race this is papering over.
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