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Old 02-03-2004, 08:21 PM   #1
Registered: Feb 2004
Location: Dallas
Distribution: Fedora
Posts: 59

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2.6.1 and kernel panics

I am trying to install 2.6.1 on a dual opteron motherboard using via chipsets. My harddrive is a sata wd raptor. When I compile and install, then boot the kernel, I get the following error:

VFS: Cannot open root device "801" on unknown-block (8,1)
Please append a correct "root=" boot option
Kernel panic: VFS: unable to mount root fs on unknown-block (8,1)

append="devfs=mount acpi=off resume=/dev/sda5"
append="devfs=mount acpi=off resume=/dev/sda5"
append="devfs=mount acpi=off resume=/dev/sda5"

Thats my current lilo.conf.

Any help would sure be nice! Thanks!

Old 02-03-2004, 08:35 PM   #2
Registered: Feb 2004
Location: Dallas
Distribution: Fedora
Posts: 59

Original Poster
Rep: Reputation: 15
Oh, one other thing that might help. My fstab looks like this:

/dev/sda1 / ext3 defaults 1 1
none /dev/pts devpts mode=0620 0 0
/dev/sda7 /home ext3 defaults 1 2
none /mnt/cdrom supermount dev=/dev/hdb,fs=udf:iso9660,ro,--,iocharset=iso8859-1 0 0
none /mnt/floppy supermount dev=/dev/fd0,fs=ext2:vfat,--,iocharset=iso8859-1,sync,umask=0,codepage=850 0 0
none /proc proc defaults 0 0
/dev/sda6 /var ext3 defaults 1 2
/dev/sda5 swap swap defaults 0 0 /gaming/cslogs nfs defaults 1 2
Old 02-03-2004, 09:23 PM   #3
LQ Newbie
Registered: Feb 2004
Posts: 1

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Your linux box can't seem to find the root partition (as if you didn't know).

First off, make sure the kernel recognizes the hard drive controller, from what I see it looks like your system thinks your sata drive is a scsi drive. Linux 2.6 might have changed sata to actually go under the ide drivers. You should check to make sure you have that driver enabled, and not as a module, have it built into the kernel.

You might try poking around by doing this from lilo:
Linux root=/dev/hda1 1

Linux can be whatever your 2.6 kernel is.

the root= changes the root device, the one will boot into run level 1.

Once you got it to boot (if it's a different device) It will probably try and remount the rootfs as rw, but will fail, because your /etc/fstab is incorrect. What you want to do is somehow get a root prompt, I don't know how your distro does it, but one way or another you need to get to that point. Then you can run `mount -oremount,rw /` to remount your rootfs in readwrite mode. Edit your /etc/fstab, then make sure you `mount -oremount,ro /` before you reboot, incase your system forgets to remount in read-only mode (essentially preparing it for system shutdown).

Let me know if this helps you at all. Or if I made an ass of myself by underestimating how much you know :P
Old 02-04-2004, 11:18 AM   #4
Registered: Oct 2003
Location: teddy bears Land
Distribution: Slackware 10
Posts: 176

Rep: Reputation: 30
I don't know why but Mandy never let me compile any kernel, no matter how much i try it always give me error of kernel panic, or no error at all but it just didn't boot up my box. and all the people i know either could compile an new kernel for their mandy maybe is a bug problem of mandy or who knows, because i compile kernels for other distros and they work fine, but whit mandy i never could. even if i do make oldconfig nothing work well guess i would live whit the doubt why i could never make mandy to boot whit a different kernel that his own recompiled one.
Old 02-04-2004, 12:51 PM   #5
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Registered: Jul 2002
Location: Montreal
Distribution: Gentoo 2004 from stage 1 baby!
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you aren't alone...I haven't been able to compile 2.6.1 properly yet...its insane...although the rpm with the precompiled 2.6.1 kernel works great!

I'm trying the new 2.6.2rc3 I got from cooker this weekend..hopefully it will work better.
Old 02-04-2004, 10:46 PM   #6
Registered: Jun 2003
Distribution: Fedora 3
Posts: 82

Rep: Reputation: 15
I have been trying to get 2.6 going here. I had it up fine with the rpm from the cooker iso snapshot. It had some problems dieing on booting half way through once in a while and never really shutdown correctly. Since then, I have been trying to get the source to load for 2.6.2rc3 no luck. I loaded source from kernel archives, not mandrake, and got it to compile, it boots most stuff but can't find some of the modules. like natsemi for my eth0. So I patiently wait for something stable for mandrake to come out. I just don't have time to fiddle with it. Why it can't find modules I don't know. Maybe something to do with mod tools?
Old 02-07-2004, 08:18 PM   #7
Registered: Feb 2004
Location: Dallas
Distribution: Fedora
Posts: 59

Original Poster
Rep: Reputation: 15
I finally got over trying to mess with Mandrake and installed Fedora Core 1 Test 1 for x86-64. Upgrading THAT distro to 2.6.2 was painless. There are a couple gotches, but it worked the fist time if you follow the instuctions found on certain web pages.


I run game servers, and I dont know if its the distro or the kernel, but after upgrading to Fedora and 2.6.2, the performance on my server is a night and day difference.


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