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    SubjectRe: Kernel 3.0: Instant kernel crash when mounting CIFS (also crashes with linux-3.1-rc2


    On Thu, 18 Aug 2011, Justin Piszcz wrote:

    >
    >
    > On Thu, 18 Aug 2011, J. R. Okajima wrote:
    >
    >>
    >> Justin Piszcz:
    >>> Does anyone know if any kernel supports CIFS w/out crashing? I'd like to
    >>> backup some CIFS shares, thanks.
    >>>
    >>>
    >>> mount -t cifs //w2/x /mnt -o user=user,pass=pass
    >>>
    >>> [ 881.388836] CIFS VFS: cifs_mount failed w/return code = -22
    >> :::
    >>
    >> Since it failed mounting, this patch will help you. Although the patch
    >> will fix one bug, there still may exist another problem.
    >>
    >> http://marc.info/?l=linux-cifs&m=131345112022031&w=2
    >
    > Hi,
    >
    > Latest patch (this one) applied to linux-3.1-rc2 works, at least it mounted
    > this time and did not instantly crash the kernel!
    >
    > I also tried the hostname again (and it did not crash the kernel, but it
    > failed to mount).
    >
    > Used the IP and it mounted successfully:
    > //10.0.0.11/x 28T 5.0T 23T 19% /mnt
    > //10.0.0.11/y 19T 1.2T 18T 7% /mnt2
    >
    > It has not crashed yet (which is good), I'll apply this patch to my
    > production machine and test taking backups of this data and let you know
    > if it crashes again, thanks!
    >
    > Justin.


    Hello,

    It is working but very slowly:

    Device eth6 [10.0.1.2] (1/1):
    ================================================================================
    Incoming: Outgoing:
    Curr: 37.60 MByte/s Curr: 0.44 MByte/s
    Avg: 4.98 MByte/s Avg: 0.09 MByte/s
    Min: 0.00 MByte/s Min: 0.00 MByte/s
    Max: 40.79 MByte/s Max: 0.48 MByte/s
    Ttl: 1.45 GByte Ttl: 26.77 MByte
    Over 10GbE the other direction (Linux -> Windows (via Samba)) I get
    500MiB/s, is CIFS slow?

    I'll look into options to tweak the speed but this is very poor speed when
    you have to transfer 5-10TB. However, it is not crashing anymore, so any
    speed is better than that :)

    Justin.



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