linux-kernel - Re: Is sata_nv compatible with async scsi scan?

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Message-ID: <49EDBC62.5070202@panasas.com>
Date:	Tue, 21 Apr 2009 15:30:26 +0300
From:	Benny Halevy <bhalevy@...asas.com>
To:	Matthew Wilcox <matthew@....cx>
CC:	Jeff Garzik <jeff@...zik.org>, Jeff Garzik <jgarzik@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>, linux-ide@...r.kernel.org,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: Is sata_nv compatible with async scsi scan?

On Apr. 21, 2009, 14:26 +0300, Matthew Wilcox <matthew@....cx> wrote:
> On Tue, Apr 21, 2009 at 06:27:56AM -0400, Jeff Garzik wrote:
>> Benny Halevy wrote:
>>> Hi Jeff,
>>>
>>> Since 2.6.29 I'm having intermittent problems with booting kernels.
>>> After supposedly waiting for scsi async scan to complete,
>>> quite frequently I see errors from the init resume process
>>> when it fails to find the swap partition and later the root
>>> file system fails to load.
>>>
>>> A workaround that I found to be helpful is booting the kernel
>>> with scsi_mod.scan=sync so I suspect sata_nv has a problem
>>> with asynchronous scanning.
>> Personally, I think the whole system is broken, so continue to use this 
>> workaround until it gets fixed upstream.  This sounds like some timing 
>> issues related to waiting for the device probe to finish, something that 
>> people keep breaking (witness my USB flash drive boot breakage).
> 
> No, it's 4ace92fc112c6069b4fcb95a31d3142d4a43ff2a.
> 
> Specifically, this bit:
> 
> @@ -179,6 +180,8 @@ int scsi_complete_async_scans(void)
>         spin_unlock(&async_scan_lock);
>  
>         kfree(data);
> +       /* Synchronize async operations globally */
> +       async_synchronize_full();
>         return 0;
>  }
>  
> Vegard Nossum has a patch that seems to have been ignored:
> 
> http://marc.info/?l=linux-kernel&m=123920746830420&w=2
> 

Hmm, it might help somewhat but my test machine still failed
to boot 2 out of 5 times with this patch.

Benny

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