linux-kernel - Re: Commit 7eaceaccab5f40 causing boot hang.

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Message-ID: <4D933584.5050005@parallels.com>
Date:	Wed, 30 Mar 2011 08:52:04 -0500
From:	Rob Landley <rlandley@...allels.com>
To:	Jens Axboe <jaxboe@...ionio.com>
CC:	Pete Clements <clem@...m.clem-digital.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>
Subject: Re: Commit 7eaceaccab5f40 causing boot hang.

On 03/30/2011 06:38 AM, Jens Axboe wrote:
> On 2011-03-30 08:06, Rob Landley wrote:
>> On 03/29/2011 10:51 AM, Pete Clements wrote:
>>> Quoting Jens Axboe
>>>   > 
>>>   > On 2011-03-29 16:13, Rob Landley wrote:
>>>   > > On 03/29/2011 08:59 AM, Jens Axboe wrote:
>>>   > >> On 2011-03-29 10:52, Rob Landley wrote:
>>>   > >>> I'm booting all this under kvm or qemu, by the way:
>>>   > >>>
>>>   > >>> qemu-system-x86_64 -m 1024 -kernel arch/x86/boot/bzImage \
>>>   > >>>   -hda ~/sid.ext3 -append "root=/dev/hda rw"
>>>   > >>>
>>>   > >>> Sometimes with init=/bin/bash in that last quoted bit.  The root
>>>   > >>> filesystem's debian sid but that's probably not relevant because it
>>>   > >>> worked fine with .38.
>>>   > >>
>>>   > >> Does this help?
>>>   > >>
>>>   > >> diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
>>>   > >> index 0e406d73..ca27d30 100644
>>>   > >> --- a/drivers/ide/ide-io.c
>>>   > >> +++ b/drivers/ide/ide-io.c
>>>   > >> @@ -570,8 +570,7 @@ void ide_requeue_and_plug(ide_drive_t *drive, struct request *rq)
>>>   > >>  	spin_unlock_irqrestore(q->queue_lock, flags);
>>>   > >>  
>>>   > >>  	/* Use 3ms as that was the old plug delay */
>>>   > >> -	if (rq)
>>>   > >> -		blk_delay_queue(q, 3);
>>>   > >> +	blk_delay_queue(q, 3);
>>>   > >>  }
>>>   > >>  
>>>   > >>  static int drive_is_ready(ide_drive_t *drive)
>>>   > >>
>>>   > > 
>>>   > > Nope, still hung the same way.
>>>   > 
>>>   > Funky. I'll try and reproduce this tonight.
>>>   > 
>>>   > -- 
>>>   > Jens Axboe
>>>   > 
>>>
>>> I have had a similiar problem (reported earlier) unable to boot.
>>> With git15-18 hung with IDE drives (hda), git19-21 moved the hang down to
>>> the IDE CDROM (hdc). Applied the above patch and now booted into git21 without
>>> any hang and all appears ok.
>>
>> It may have made it better for me, it's hard to tell.
>>
>> I did a fresh pull, re-applied the patch, and tried again with
>> init=/bin/sh and it booted to the shell prompt... which then hung when I
>> did "ls -l /".
>>
>> If I let it boot normally, init announces itself, gives a spurious
>> warning about a fstab field (which it's been doing for a while, my fault
>> but harmless), then hangs.
>>
>>> This is i386, UP.
>>
>> I'm doing x86-64 SMP.
> 
> I think we have the same issue the other location. How about this, then:
> 
> diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
> index 0e406d73..4978ec3 100644
> --- a/drivers/ide/ide-io.c
> +++ b/drivers/ide/ide-io.c
> @@ -549,12 +549,11 @@ plug_device:
>  	spin_unlock_irq(&hwif->lock);
>  	ide_unlock_host(host);
>  plug_device_2:
> +	blk_delay_queue(q, queue_run_ms);
>  	spin_lock_irq(q->queue_lock);
>  
> -	if (rq) {
> +	if (rq)
>  		blk_requeue_request(q, rq);
> -		blk_delay_queue(q, queue_run_ms);
> -	}
>  }
>  
>  void ide_requeue_and_plug(ide_drive_t *drive, struct request *rq)
> @@ -570,8 +569,7 @@ void ide_requeue_and_plug(ide_drive_t *drive, struct request *rq)
>  	spin_unlock_irqrestore(q->queue_lock, flags);
>  
>  	/* Use 3ms as that was the old plug delay */
> -	if (rq)
> -		blk_delay_queue(q, 3);
> +	blk_delay_queue(q, 3);
>  }
>  
>  static int drive_is_ready(ide_drive_t *drive)
> 

Did a fresh pull and applied that patch.  (It conflicts with your
previous one, but looks like it includes it.)

Now it hangs after the "EXT3-fs: barriers not enabled" line, doesn't
make it to init.

Rob
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