linux-ext4 - [Bug 23772] oops after mounting ext4 fs in 2.6.36.1 (failed to parse options in superblock)

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Date:	Tue, 30 Nov 2010 18:07:09 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 23772] oops after mounting ext4 fs in 2.6.36.1 (failed to parse
 options in superblock)

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





--- Comment #17 from Eric Sandeen <sandeen@...hat.com>  2010-11-30 18:07:08 ---
Something is scribbling on / has scribbled on the front of your filesystem, it
seems.

hexdumping the first 2 blocks you sent:

00000580  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
000005e0  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff 0f 00  |................|
000005f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000600  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
00000660  ff ff ff ff ff ff ff 01  00 00 00 00 00 00 00 00  |................|
00000670  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000680  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
000006e0  ff ff ff ff ff ff ff ff  0f 00 00 00 00 00 00 00  |................|
00000580  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
000005e0  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff 0f 00  |................|
000005f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000600  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
00000660  ff ff ff ff ff ff ff 01  00 00 00 00 00 00 00 00  |................|
00000670  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000680  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
000006e0  ff ff ff ff ff ff ff ff  0f 00 00 00 00 00 00 00  |................|
000006f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000700  ff ff ff ff 7f 00 00 00  00 00 00 00 00 00 00 00  |................|
00000710  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|


superblock starts at 0x400; so here we are at offset 0x180 to 0x310 in the sb.

There's a lot of "-1" (0xff) in there with a few other values.  This translates
into the "4294967295" values you see above.

The various error tracking bits are in this part of the superblock so you're
seeing the -1/4294967295 pop out in the error reporting code:

     __le32    s_error_count;        /* number of fs errors */
     __le32    s_first_error_time;    /* first time an error happened */
     __le32    s_first_error_ino;    /* inode involved in first error */
/*1a0*/    __le64    s_first_error_block;    /* block involved of first error
*/
/*1a8*/    __u8    s_first_error_func[32];    /* function where the error
happened */
/*1c8*/    __le32    s_first_error_line;    /* line number where error happened
*/
     __le32    s_last_error_time;    /* most recent time of an error */
/*1d0*/    __le32    s_last_error_ino;    /* inode involved in last error */
     __le32    s_last_error_line;    /* line number where error happened */
     __le64    s_last_error_block;    /* block involved of last error */
/*1e0*/    __u8    s_last_error_func[32];    /* function where the error
happened */

Your dd above should have zeroed this out, though, which makes me wonder how
you got 1's back in here.  It could be anything, though I wonder if it's
possible that it's a stray bitmap....

What kind of storage is this?

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