fsck 1.39 segfaults while fixing a corrupt inode

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Hi!

I have a severe problem - I was a fool and made / (root) ext4 (at
least not /home, thank god) and somehow some corruption occured.
While running fsck, it keeps segfaulting, complaining about fast
memory corruption (segfaults always at the same inode, always when I
tell it to fix it). I *think* the issue was addressed in
e2fsprogs-1.40.2 (from what I understood in the changelog) - but I
can't find a patchset for it...
I tried to do the 1.39 patch on the 1.40.2 source but there were more
then a few mismatches and it didn't build. With enough work, I might
be able to build it, but I strongly prefer a ready patch/tarball which
I would know works, but I haven't found any on the net.

Can anyone please point me to one or send one to me, or advise on a
different solution?

Attached is the error log.

Thanks in advance,
Kosta.

-- 
Kosta.tk
#fsck -a /dev/sda3

/ contains a file system with errors, check forced.
/: Inode 7413663 has high 16 bits of extent/index block set
CLEARED.
/: High 16 bits of extent/index block set
CLEARED.
/: Inode 7413663 has corrupt extent index at block 1769235789 (logical 778400627) entry 0
CLEARED.
/: 

*** glibc detected *** fsck.ext4: malloc(): memory corruption (fast): 0x0809b878 ***
======= Backtrace: =========
/lib/libc.so.6[0xb7e43510]
/lib/libc.so.6[0xb7e45c17]
/lib/libc.so.6(malloc+0x7e)[0xb7e46e2e]
/lib/libc.so.6[0xb7e040f0]
/lib/libc.so.6[0xb7e02511]
/lib/libc.so.6[0xb7e01e9c]
/lib/libc.so.6(__dcgettext+0x3d)[0xb7e00fbd]
fsck.ext4[0x805ddea]
fsck.ext4[0x80504dc]
fsck.ext4[0x805186f]
/lib/libext2fs.so.2(block_iterate_extents+0x310)[0xb7f28ad7]
/lib/libext2fs.so.2(ext2fs_block_iterate2+0x1c8)[0xb7f256f5]
fsck.ext4[0x8050e1b]
fsck.ext4[0x8051b4c]
fsck.ext4[0x8051bc7]
/lib/libext2fs.so.2(ext2fs_get_next_inode_full+0x45)[0xb7f2c16e]
fsck.ext4[0x80530bc]
fsck.ext4[0x804e004]
fsck.ext4[0x804dcce]
/lib/libc.so.6(__libc_start_main+0xdc)[0xb7df39bc]
fsck.ext4[0x804b881]
======= Memory map: ========
08048000-08068000 r-xp 00000000 08:03 2785317    /sbin/e2fsck
08068000-0806a000 rw-p 00020000 08:03 2785317    /sbin/e2fsck
0806a000-080e3000 rw-p 0806a000 00:00 0          [heap]
b6f00000-b6f21000 rw-p b6f00000 00:00 0
b6f21000-b7000000 ---p b6f21000 00:00 0
b7099000-b70a3000 r-xp 00000000 08:03 6390674    /usr/lib/gcc/i586-pc-linux-gnu/4.1.2/libgcc_s.so.1
b70a3000-b70a4000 rw-p 00009000 08:03 6390674    /usr/lib/gcc/i586-pc-linux-gnu/4.1.2/libgcc_s.so.1
b70cd000-b7d9e000 rw-p b70cd000 00:00 0
b7d9e000-b7ddd000 r--p 00000000 08:03 7668654    /usr/lib/locale/en_US.utf8/LC_CTYPE
b7ddd000-b7dde000 rw-p b7ddd000 00:00 0
b7dde000-b7f08000 r-xp 00000000 08:03 3018119    /lib/libc-2.6.so
b7f08000-b7f0a000 r--p 00129000 08:03 3018119    /lib/libc-2.6.so
b7f0a000-b7f0b000 rw-p 0012b000 08:03 3018119    /lib/libc-2.6.so
b7f0b000-b7f0e000 rw-p b7f0b000 00:00 0
b7f0e000-b7f10000 r-xp 00000000 08:03 5570963    /lib/libuuid.so.1.2
b7f10000-b7f11000 rw-p 00001000 08:03 5570963    /lib/libuuid.so.1.2
b7f11000-b7f17000 r-xp 00000000 08:03 5570827    /lib/libblkid.so.1.0
b7f17000-b7f18000 rw-p 00006000 08:03 5570827    /lib/libblkid.so.1.0
b7f18000-b7f1a000 r-xp 00000000 08:03 2492999    /lib/libcom_err.so.2.1
b7f1a000-b7f1b000 rw-p 00001000 08:03 2492999    /lib/libcom_err.so.2.1
b7f1b000-b7f34000 r-xp 00000000 08:03 5570863    /lib/libext2fs.so.2.4
b7f34000-b7f35000 rw-p 00019000 08:03 5570863    /lib/libext2fs.so.2.4
b7f35000-b7f36000 rw-p b7f35000 00:00 0
b7f57000-b7f5e000 r--s 00000000 08:03 6557443    /usr/lib/gconv/gconv-modules.cache
b7f5e000-b7f5f000 r--p 00000000 08:03 7668715    /usr/lib/locale/en_US.utf8/LC_MESSAGES/SYS_LC_MESSAGES
b7f5f000-b7f60000 r-xp b7f5f000 00:00 0          [vdso]
b7f60000-b7f7a000 r-xp 00000000 08:03 3018117    /lib/ld-2.6.so
b7f7a000-b7f7b000 r--p 00019000 08:03 3018117    /lib/ld-2.6.so
b7f7b000-b7f7c000 rw-p 0001a000 08:03 3018117    /lib/ld-2.6.so
bfc4e000-bfc64000 rw-p bfc4e000 00:00 0          [stack]

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