Unable to mount a partition

My colleague's Redhat 9 failed to boot, showing a error in
/etc/rc.sysinit line 182. I booted the machine with a Knoppix Live CD.
Then I tried to mount the root partition, it said the device is busy or
already mounted.

I tried running `badblocks /dev/hda2`, no error reported.

Then I `e2fsck /dev/hda2`, it still said the device is busy.

Now how could I safely recover the partition? Is it a dead superblock?

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