BUG in GRUB

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This is the output of my commands when run from terminal:

---------------------------------------------------
    GNU GRUB  version 0.95  (640K lower / 3072K upper memory)

 [ Minimal BASH-like line editing is supported.  For the first word, TAB
   lists possible command completions.  Anywhere else TAB lists the possible
   completions of a device/filename.]

grub> root (hd0,4)
 Filesystem type is reiserfs, partition type 0x83

grub> kernel /boot/vmlinuz-2.6.11-1.1369_FC4
   [Linux-bzImage, setup=0x1e00, size=0x18e473]

grub> initrd /boot/initrd-2.6.11-1.1369_FC4.img
 Possible files are: initrd-2.6.11-1.1369_FC4.img-2 
initrd-2.6.11-1.1369_FC4.img-3 initrd-2.6.11-1.1369_FC4.img-4 
initrd-2.6.11-1.1369_FC4.img

grub> initrd /boot/initrd-2.6.11-1.1369_FC4.img
   [Linux-initrd @ 0x2dc000, 0x113f39 bytes]

grub>
---------------------------------------------------

When the same commands are run in boot grub (when the grub has just been 
loaded on system startup), the output is the following:

---------------------------------------------------
    GNU GRUB  version 0.95  (640K lower / 3072K upper memory)

 [ Minimal BASH-like line editing is supported.  For the first word, TAB
   lists possible command completions.  Anywhere else TAB lists the possible
   completions of a device/filename.]

grub> root (hd0,4)
 Filesystem type is reiserfs, partition type 0x83

grub> kernel /boot/vmlinuz-2.6.11-1.1369_FC4
   [Linux-bzImage, setup=0x1e00, size=0x18e473]

grub> initrd /boot/initrd-2.6.11-1.1369_FC4.img
 Possible files are: initrd-2.6.11-1.1369_FC4.img-2 
initrd-2.6.11-1.1369_FC4.img-3 initrd-2.6.11-1.1369_FC4.img-4 
initrd-2.6.11-1.1369_FC4.img

grub> initrd /boot/initrd-2.6.11-1.1369_FC4.img

grub>
---------------------------------------------------


You may notice after specifying "initrd" command the output is nothing. And 
system fails to start - apparently because there's no initrd loaded and the 
root fs can not be mounted. I have created 3 copies of initrd file 
(absolutely the same copies). On boot when asking to load 
initrd-2.6.11-1.1369_FC4.img-2 and initrd-2.6.11-1.1369_FC4.img-3 everything 
is fine - grub responses: [Linux-initrd @ 0x2dc000, 0x113f39 bytes]. But on 
initrd images initrd-2.6.11-1.1369_FC4.img and initrd-2.6.11-1.1369_FC4.img-4 
grub tells nothing and system does not load. Why, why is that? How can I 
debug grub on boot stage when nothing is loaded? But when grub is run from 
terminal, it works just fine... All initrd files are *absolutelly* the same, 
same size, no diff, same permissions, timestamps, etc. Inode number only 
differ.


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