# file /opt/e2fsprogs/sbin/e2fsck
/opt/e2fsprogs/sbin/e2fsck: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.8, statically linked, not stripped
# /opt/e2fsprogs/sbin/e2fsck -n /dev/md4
e2fsck 1.40.2 (12-Jul-2007)
Warning!  /dev/md4 is mounted.
/dev/md4: clean, 451104/4685824 files, 7329339/9371600 blocks
# /opt/e2fsprogs/sbin/e2fsck -nvf /dev/md4
e2fsck 1.40.2 (12-Jul-2007)
Warning!  /dev/md4 is mounted.
Pass 1: Checking inodes, blocks, and sizes
Error while reading over extent tree in inode 410214: Corrupt extent header
Clear inode? no

*** glibc detected *** /opt/e2fsprogs/sbin/e2fsck: free(): invalid pointer: 0x08126fe0 ***
======= Backtrace: =========
[0x80a3bae]
[0x80a728b]
[0x807010b]
[0x806bd61]
[0x8051753]
[0x80517b1]
[0x804ff15]
[0x804c09b]
[0x804b56d]
[0x808516b]
[0x8048151]
======= Memory map: ========
08048000-0810f000 r-xp 00000000 08:05 131529     /opt/e2fsprogs/sbin/e2fsck
0810f000-08112000 rw-p 000c7000 08:05 131529     /opt/e2fsprogs/sbin/e2fsck
08112000-081df000 rw-p 08112000 00:00 0          [heap]
b7600000-b7621000 rw-p b7600000 00:00 0 
b7621000-b7700000 ---p b7621000 00:00 0 
b7774000-b7dd1000 rw-p b7774000 00:00 0 
b7dd1000-b7dd8000 r--s 00000000 08:05 182416     /usr/lib/gconv/gconv-modules.cache
b7dd8000-b7dd9000 rw-p b7dd8000 00:00 0 
b7dd9000-b7f51000 r--p 00000000 08:05 258744     /usr/lib/locale/locale-archive
b7f51000-b7f52000 r-xp b7f51000 00:00 0          [vdso]
bf969000-bf97e000 rw-p bffeb000 00:00 0          [stack]
Aborted (core dumped)
# gdb -c /var/crash/core.e2fsck-2899
GNU gdb 6.6.90.20070912-debian
This GDB was configured as "i486-linux-gnu".
(no debugging symbols found)
Using host libthread_db library "/lib/i686/cmov/libthread_db.so.1".
Core was generated by `/opt/e2fsprogs/sbin/e2fsck -nvf /dev/md4'.
Program terminated with signal 6, Aborted.
#0  0x080bc9c0 in ?? ()
(gdb) bt full
#0  0x080bc9c0 in ?? ()
No symbol table info available.
(gdb) quit