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Old 08-27-2003, 01:57 PM   #1
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Registered: Aug 2003
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/boot is empty after kernel upgrade

Okay, I used to be on kernel 2.4.9-31 and wanted to upgrade to the latest, 2.4.22.

I configured the kernel, made everything, and did make install. Updated lilo.conf, keeping my old kernel as a boot option. I even went another step and made a complete copy of my /boot directory and saved it as /bootbackup

So everything looked right, I rebooted, and it came up fine. Seems great until I check out my boot logs to see if there's any problems. The first problem seems to be here:

kernel: Cannot find map file.

So I go check out the /boot directory and it's completely empty except for one file: kernel.h! No old kernel, no new kernel, nothing. So I go back to the logs and keep looking. I see this line:

kernel: Kernel command line: auto BOOT_IMAGE=linux ro root=303 BOOT_FILE=/boot/vmlinuz-2.4.22

So I figure, ok - well it referenced the new kernel file, so it must be able to see it somehow. It must still exist... So I keep going through the log file. Next error I see is:

EXT2-fs warning (device ide0(3,3)): ext2_read_super: mounting ext3 filesystem as ext2

Then immediately:

VFS: Mounted root (ext2 filesystem) readonly.

And then a little further down, 3 lines right in a row:

modprobe: modprobe: Can't locate module ext3

mount: mount: fs type ext3 not supported by kernel

netfs: Mounting other filesystems: failed

I check df -Th:

Filesystem Type Size Used Avail Use% Mounted on
/dev/hda3 ext3 54G 20G 31G 38% /
none tmpfs 251M 0 251M 0% /dev/shm

Then I cat /proc/mounts:

rootfs / rootfs rw 0 0
/dev/root / ext2 rw 0 0
/proc /proc proc rw 0 0
none /dev/pts devpts rw 0 0
none /dev/shm tmpfs rw 0 0

And finally, I cat /etc/fstab:

LABEL=/ / ext3 defaults 1 1
LABEL=/boot /boot ext3 defaults 1 2
none /dev/pts devpts gid=5,mode=620 0 0
none /proc proc defaults 0 0
none /dev/shm tmpfs defaults 0 0
/dev/hda2 swap swap defaults 0 0

I went back and realized that I did not enable the journal ext3 in the kernel config, which is probably the source of the mounting problems. I checked out my previous bootup logs and it looks like the previous kernel had it enabled and was using that filesystem.

However, I'm still not sure why my /boot directory looks empty. I don't know if it's really empty or if there's just something that prevents me from seeing its contents...

I DO have /bootbackup, which is an exact replica of my previous kernel's /boot directory, but I don't know if I should overwrite my /boot directory with it or do what. I'm worried that if the /boot directory is still OK and I can't see its contents - I don't want to overwrite the invisible contents with /bootbackup and have things fail on me.

Suggestions, advice? Help please!

- Jonathan
Old 08-27-2003, 05:28 PM   #2
Registered: Feb 2002
Location: Grenoble
Distribution: Debian
Posts: 9,696

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There's no /boot mounteed at your /cat/mounts list. That's why it'e empty. Kernel booted from it but was unable to mount it (because it was ext3). When you boot old kernel, everything will be OK. Just compile again with ext3 support.


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