https://bugzilla.kernel.org/show_bug.cgi?id=23772

           Summary: oops after mounting ext4 fs in 2.6.36.1 (failed to
                    parse options in superblock)
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.36.1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@kernel-bugs.osdl.org
        ReportedBy: fdziarmagowski@gmail.com
        Regression: No


Created an attachment (id=38222)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=38222)
output of tune2fs -l

I've just upgraded kernel to 2.6.36.1 and unfortunately some new features in
ext4 are deadly for my setup.
Mounting an external usb WD disk causes at first some dmesg activity:

Nov 25 21:10:01 aquarius kernel: EXT4-fs (sdb1): Unrecognized mount option
"ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ."
or missing value
Nov 25 21:10:01 aquarius kernel: EXT4-fs (sdb1): failed to parse options in
superblock:
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ.
Nov 25 21:10:01 aquarius kernel: EXT4-fs (sdb1): mounted filesystem with
ordered data mode. Opts:
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ.; (null)

And this is how it looks like with 2.6.35.x:
Nov 17 06:43:28 aquarius kernel: EXT4-fs (sdb1): recovery complete
Nov 17 06:43:28 aquarius kernel: EXT4-fs (sdb1): mounted filesystem with
ordered data mode. Opts: data=ordered

Just after mounting kernel is generating an oops, locking my system completely
(sysrq does not work!).

There are no special options passed to mount at mount time:
/dev/disk/by-label/MyBook    /mnt/mybook    ext4    noauto    0 0

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