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

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Date:	Wed, 30 Mar 2011 01:06:44 -0500
From:	Rob Landley <rlandley@...allels.com>
To:	Pete Clements <clem@...m.clem-digital.net>
CC:	Jens Axboe <jaxboe@...ionio.com>,
	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 03/29/2011 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.

Rob
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