[BUG] e2fsprogs & ext2/3 behave poorly with corrupt group descriptors

Hi folks,

I had a filesystem corrupted recently (yay laptops) which showed rather 
poor behaviour with e2fsck, e2image and the filesystem itself.  What 
happened is that a corrupt copy of one of the group descriptors was 
written back to disk -- search for the string of 4444s in the sector 
below.

e2image dies when attempting to take a snapshot of this filesystem with 
an -EINVAL when it attempts to dereference the non-extant block group.  
Similarly, the kernel refuses to mount the filesystem (which I intend to 
make a patch for shortly), despite the fact that 99% of it is still 
intact.

The filesystem itself is rather large and boring, but if anyone wants any 
further data from it, please drop me a note.  Cheers,

		-ben
-- 
"Time is of no importance, Mr. President, only life is important."
Don't Email: <[email protected]>.

0003800 0000 00a0 0001 00a0 0002 00a0 7bff 7fe0
0003810 0000 0000 0000 0000 0000 0000 0000 0000
0003820 8000 00a0 8001 00a0 8002 00a0 7a3d 7fc9
0003830 0000 0000 0000 0000 0000 0000 0000 0000
0003840 0000 00a1 0001 00a1 0002 00a1 7bff 7fe0
0003850 0000 0000 0000 0000 0000 0000 0000 0000
0003860 8000 00a1 4444 4444 4444 4444 4444 4444
0003870 0000 0000 0000 0000 0000 0000 0000 0000
0003880 0000 00a2 0001 00a2 0002 00a2 7bff 7fe0
0003890 0000 0000 0000 0000 0000 0000 0000 0000
00038a0 8000 00a2 8001 00a2 8002 00a2 7b91 7fd4
00038b0 0000 0000 0000 0000 0000 0000 0000 0000
00038c0 0000 00a3 0001 00a3 0002 00a3 7bff 7fe0
00038d0 0000 0000 0000 0000 0000 0000 0000 0000
00038e0 8000 00a3 8001 00a3 8002 00a3 7a5c 7fc8
00038f0 0000 0000 0000 0000 0000 0000 0000 0000
0003900 0000 00a4 0001 00a4 0002 00a4 7bff 7fe0
0003910 0000 0000 0000 0000 0000 0000 0000 0000
0003920 8000 00a4 8001 00a4 8002 00a4 7a42 7fc6
0003930 0000 0000 0000 0000 0000 0000 0000 0000
0003940 0000 00a5 0001 00a5 0002 00a5 7bff 7fe0
0003950 0000 0000 0000 0000 0000 0000 0000 0000
0003960 8000 00a5 8001 00a5 8002 00a5 7b23 7fd0
0003970 0000 0000 0000 0000 0000 0000 0000 0000
0003980 0000 00a6 0001 00a6 0002 00a6 7bff 7fe0
0003990 0000 0000 0000 0000 0000 0000 0000 0000
00039a0 8000 00a6 8001 00a6 8002 00a6 7a53 7f97
00039b0 0000 0000 0000 0000 0000 0000 0000 0000
00039c0 0000 00a7 0001 00a7 0002 00a7 7bff 7fe0
00039d0 0000 0000 0000 0000 0000 0000 0000 0000
00039e0 8000 00a7 8001 00a7 8002 00a7 7a41 7fc6
00039f0 0000 0000 0000 0000 0000 0000 0000 0000


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