linux-kernel - Re: Linux 2.6.35

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Message-Id: <20100802214249.b0fee617.rdunlap@xenotime.net>
Date:	Mon, 2 Aug 2010 21:42:49 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Donald Parsons <dparsons@...ghtdsl.net>
Cc:	Harald Hoyer <harald.hoyer@...il.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Linux 2.6.35

On Mon, 02 Aug 2010 22:31:41 -0400 Donald Parsons wrote:

> On Mon, 2010-08-02 at 18:08 +0200, Harald Hoyer wrote: 
> > On Mon, Aug 2, 2010 at 6:21 AM, Donald Parsons <dparsons@...ghtdsl.net> wrote:
> > > On Sun, 2010-08-01 at 21:38 -0600, Bjorn Helgaas wrote:
> > >> On Sunday, August 01, 2010 08:31:02 pm Donald Parsons wrote:
> > >> > 2.6.35 still fails to boot for me, as first reported here:
> > >> >  http://lkml.indiana.edu/hypermail/linux/kernel/1007.3/01144.html
> > >> >
> > >> > I've manually bisected it down to around May 20 between
> > >> >   2.6.34-git4 (boots) and 2.6.34-git5 (boot fails)
> > >> > Also -git[23] boot, and -git8, -rc[126], rc6-git[136] all fail.
> > >> >
> > >> > Unfortunately first time I tried was with 2.6.35-rc6 and
> > >> > it failed to boot.
> > >> >
> > >> > Failure when switching from initramfs to real /root?
> > >> > Removing kernel "quiet" param appears to show several
> > >> > lines listing:
> > >> >
> > >> >   usb drives/hubs? followed by
> > >> >   dracut switching root (when booting works)
> > >> >               or
> > >> >   usb drives/hubs? followed by
> > >> >         (missing dracut... line)
> > >> >   No root device found
> > >> >   Boot has failed, sleeping forever.   (when it does not boot)
> > >> >
> > >> > Grub, typical entry:
> > >> > title Fedora (2.6.35)
> > >> >     root (hd0,0)
> > >> >     kernel /vmlinuz-2.6.35 ro
> > >> > root=UUID=686dc496-8814-4c36-8fb7-5ded2916e825 rhgb
> > >> > SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8 KEYTABLE=us
> > >> > rdblacklist=nouveau init=/sbin/bootchartd
> > >> >     initrd /initramfs-2.6.35.img
> > >> >
> > >> >
> > >> > My boot failure seems to be different than other two reported
> > >> > in the thread "2.6.35-rc6-git6: Reported regressions from 2.6.34"
> > >> > under Bug #16173 and #16228
> > >>
> > >> Will it boot with the "pci=nocrs" option?  If so, please open a
> > >
> > > No, I tried this on a few attempts when I saw it mentioned under
> > > bug #16228.  But it had no effect/benefit.  Sorry, I should have
> > > mentioned this.
> > >
> > >> report at https://bugzilla.kernel.org, mark it a regression, assign
> > >> it to me, and attach the complete dmesg log.  And please respond to
> > >> this thread with a pointer to the bugzilla.
> > >>
> > >> Otherwise, a complete console log should have a clue.  The best
> > >> thing would be a log from a serial console or netconsole, with
> > >> "ignore_loglevel".
> > >
> > > Maybe I will try netconsole tomorrow.  But is Ethernet up when
> > > this boot failure happens?  I think not, since initramfs should
> > > not need networking.
> > >
> > > Should I try building sata driver into kernel?  Oh, I am using
> > > ext3, and fdisk -l shows:
> > 
> > # dracut --add-drivers "sata" ....
> > 
> > or edit /etc/dracut.conf:
> > 
> > add_drivers+=" sata "
> 
> But the kernel used to boot with same identical modules before
> but not after 2.6.34-git4.
>  --------
> 
> Using your suggestion as to where the problem lies, I investigated
> more deeply and found:
> 
> I've now got 2.6.35-rc6-git3 to boot (and almost certainly 2.6.35 final)
> 
> Make oldconfig broke at the transition where boot began failed, ie,
> between 2.6.34-git4 and 2.6.34-git5.   Even though modules are the
> same, boot fails.  If I use gconfig and set CONFIG_SATA_AHCI=y
> instead of CONFIG_SATA_AHCI=m it works, except cannot select =y
> unless CONFIG_ATA changed from m to y.
> 
> So at some point in past, make oldconfig had apparently changed
> CONFIG_SATA_AHCI from y to m and system still booted.  But between
> 2.6.34-git4 and 2.6.34-git5 the ability to boot was lost.
> 
> So make oldconfig is not 100% trustworthy in this case.  I do not
> know if this is a problem that should be fixed.  Ask if you want
> any .config diffs.
> 
> I am going to reboot with 2.6.35 to make sure it boots. Yes!
> 
> I consider this boot problem solved unless someone wants to
> improve "make oldconfig" behavior.

It would be good to be able to explain what you are seeing & describing,
so yes, if you can send a .config file that exhibits the problem, I'd
love to look at it.

thanks,
---
~Randy
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