Re: Kernelpanic - not syncing: VFS: Unable to mount root fs onunknown-block

[Chris Gorman]

An upgrade to 2.6.11.8 has solved this problem for me.

Thanks

Chris

On Fri, 29 Apr 2005, Chris Gorman wrote:

> Hello All,
>
> First off, I am not on the linux-kernel list so please cc me directly on
> this if anyone has a solution.  I've experienced a very similar problem
> as S S did while upgrading from 2.6.11.6 to 2.6.11.7.  Essentialy grub
> will boot 2.6.11.6 without any problems, but using the same command line
> 2.6.11.7 fails to boot with "Cannot open root device hde6 or
> unknown-block(0,0)".  The config file used was the same one as 2.6.11.6 so
> I doubt I missed a config option.
>
> The reason I chose to upgrade was because I've been getting ext3 errors
> which caused the journal to crash and the filesystem to be remounted
> read-only.  I hoped the following referenced patch would resolve it.
>
> [PATCH] Prevent race condition in jbd
>
> From: Stephen Tweedie <sct@xxxxxxxxxx>
> Subject: Prevent race condition in jbd
>
> This patch from Stephen Tweedie which fixes a race in jbd code (it
> demonstrated itself as more or less random NULL dereferences in
> the journal code).
>
> Acked-by: Jan Kara <jack@xxxxxxx>
> Acked-by: Chris Mason <mason@xxxxxxxx>
> Signed-off-by: Chris Wright <chrisw@xxxxxxxx>
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
>
> I only see a few other patches in the Changelog and none appear to me to
> be fs relevant.  Could this be part of our problem?  I've seen one other
> post "Re: Linux 2.6.12-rc2" by hubert.tonneau@xxxxxxxxxxxxxx which
> describes the same symptom.  The problem occured during an upgrade from
> 2.6.11 to 2.6.12-rc[12] and this person does have ext3 compiled in.
>
> Also, since grub is common between myself and S S, and my grub is a little
> old, I will try upgrading the program in case that is the problem.
>
> TIA
>
> Chris Gorman
>
> On Apr 18, 2005 S S wrote:
> > I compiled linux kernel 2.6.11.7 on RHEL and while
> > rebooting I get this
> > error message -
> >
> > Cannot open root device /SCSIGroup00/SCSIVol000
> > Please append a correct "root=" boot option
> > Kernelpanic - not syncing: VFS: Unable to mount root
> > fs on
> > unknown-block 0,0
> >
> > This root entry in grub .conf is identical to kernel
> > image entry 2.6.9 which boots fine. However 2.6.11.7
> > compiled kernel does not find
> > /dev//SCSIGroup00/SCSIVol000
> >
> > Could anyone please suggest what could be going wrong.
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