Freshly created fs using:

mkfs -E test_fs -t ext3 /dev/cciss/c0d0p8
tune2fs -O extents -E test_fs /dev/cciss/c0d0p8

then mounted via:
mount /squid-cache0

from fstab:
# <file system> <mount point>   <type>  <options> <dump>  <pass>
/dev/cciss/c0d0p8       /squid-cache0   auto defaults,noatime,nodev,noexec,errors=panic      0  1

results in:
/dev/cciss/c0d0p8 on /squid-cache0 type ext4dev (rw,noexec,nodev,noatime,errors=panic)

in dmesg I get:

[    5.586583] proc_dir_entry 'stats' already registered

complete dmesg:

[    0.000000] Linux version 2.6.27-rc3 (root@proxy-cvk-1) (gcc version 4.2.4 (Debian 4.2.4-3)) #1 SMP Wed Aug 13 14:16:27 CEST 2008
[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  BIOS-e820: 0000000000000100 - 000000000009f400 (usable)
[    0.000000]  BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved)
[    0.000000]  BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
[    0.000000]  BIOS-e820: 0000000000100000 - 000000007fff3000 (usable)
[    0.000000]  BIOS-e820: 000000007fff3000 - 000000007fffb000 (ACPI data)
[    0.000000]  BIOS-e820: 000000007fffb000 - 0000000080000000 (reserved)
[    0.000000]  BIOS-e820: 00000000fec00000 - 00000000fed00000 (reserved)
[    0.000000]  BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved)
[    0.000000]  BIOS-e820: 00000000ffc00000 - 0000000100000000 (reserved)
[    0.000000] last_pfn = 0x7fff3 max_arch_pfn = 0x1000000
[    0.000000] x86 PAT enabled: cpu 0, old 0x7010600070106, new 0x7010600070106
[    0.000000] kernel direct mapping tables up to 38000000 @ 7000-c000
[    0.000000] DMI 2.3 present.
[    0.000000] ACPI: RSDP 000F4EE0, 0024 (r2 HP    )
[    0.000000] ACPI: XSDT 7FFF32C0, 004C (r1 HP     P54             2