2.4.0-test4 Corrupt filesystems

From: Cy (llucius@tiny.net)
Date: Fri Jul 14 2000 - 00:11:55 EDT

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    (Be gentle. I not a kernel hacker. Just someone that likes to stay
    "current". B-))

    Twice now I've wound up with corrupted file systems, once with test3-pre7
    and now with test4. The corruption happens to all mounted (rw) filesystems.
    I "think" it happens on shutdown since everything runs fine and the on next
    boot the kernel basically say the root fs is *ucked. B-)

    I was able to recover most of my files the first time and hope I can this
    time as well. I'll leave one of the corrupted FSes alone for a bit in case
    anyone needs more info. I can even provide telnet/ftp access if needed.

    What appears to be happening is that the data in the superblocks and bitmaps
    get "shifted over/up" 2 bytes to the left (as viewed with a hex editor).
    Here's a snippet of what the corrupted superblock looks like:

    00000000 : 80 07 1C 00 38 00 38 00-02 00 02 00 27 00 27 00 :
    ....8.8.....'.'.
    00000001 : AE 05 1C 00 00 00 00 00-00 00 00 00 02 00 02 00 :
    ®...............
    00000002 : 00 80 00 00 00 00 00 00-00 00 00 00 6E 39 6E 39 :
    ............n9n9
    00000003 : C1 62 06 00 06 00 53 EF-53 EF 01 00 01 00 00 00 :
    Áb....SïSï......
    00000004 : 36 01 6D 39 ED 00 ED 00-00 00 00 00 00 00 00 00 :
    6.m9í.í.........
    00000005 : 00 00 0B 00 0B 00 80 00-80 00 00 00 00 00 00 00 :
    ................
    00000006 : 02 00 01 00 01 00 96 6D-96 6D 3E 27 3E 27 3E 27 :
    .......m.m>'>'>'
    00000007 : 9F 76 E4 7B E4 7B 00 00-00 00 00 00 00 00 00 00 :
    .vä{ä{..........

    Here's one of the backup superblocks:

    00000000 : 80 07 1C 00 1C 0B 38 00-5B CD 02 00 CD 3A 22 00 :
    ......8.[Í..Í:".
    00000001 : AB 05 1C 00 00 00 00 00-02 00 00 00 02 00 00 00 :
    «...............
    00000002 : 00 80 00 00 00 80 00 00-80 3F 00 00 3A AA 6C 39 :
    .........?..:ªl9
    00000003 : 36 01 6D 39 00 00 14 00-53 EF 00 00 01 00 00 00 :
    6.m9....Sï......
    00000004 : 36 01 6D 39 00 4E ED 00-00 00 00 00 01 00 00 00 :
    6.m9.Ní.........
    00000005 : 00 00 00 00 0B 00 00 00-80 00 01 00 00 00 00 00 :
    ................
    00000006 : 02 00 00 00 01 00 00 00-96 6D EC DB 3E 27 46 2F :
    .........mìÛ>'F/
    00000007 : 9F 76 53 DD E4 7B 36 C2-00 00 00 00 00 00 00 00 :
    .vSÝä{6Â........

    The bitmaps have the same kind of corruption.

    Hollar if there's anything else I can provide.

    Leland

    Here's some system info:

    Asus MES-N - beta bios version 1006.02
    Celeron 433
    64MB memory
    Western Digital WD205AA
    D-Link DFE-570TX

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    This archive was generated by hypermail 2b29 : Fri Jul 14 2000 - 00:18:41 EDT