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    Subject2.2.14 SIGBUS
    I've been getting processes SIGBUS'd on my root-NFS'd firewall.  The
    cause seems to be NFS related or knfsd related. I've tracked the
    problem throughout the mm layer on the client by following printk's:

    filemap_nopage: readpage 1 (c0046c24) failed
    do_no_page: vma->vm_ops->nopage (c00290d4) failed
    do_page_fault: killing sshd(560) indicates that these addresses are:

    c00290d4 t filemap_nopage
    c0046c24 t return_EIO

    So the inode has been marked bad.

    I've been able to reproduce it by keeping the NFS server busy while the
    client does a recursive ls on an NFS mount from this server, and
    repeatidly doing 'ssh client ps aux' until it breaks.

    Once it breaks, then that's it - it will always send a SIGBUS to the
    processes, and the only way out seems to be a reboot of the client.

    The server is running 2.2.13, knfsd, with the nfs-utils-0.1.5 package.
    I've recently upgraded the client to 2.2.14, and noticed this problem.
    Tomorrow, I'll try backing down the client to 2.2.13 and re-testing in
    the same way (update will follow).

    I have a feeling though that 2.2.13 will behave similarly, which would
    point to knfsd as the cause.
    |_____| ------------------------------------------------- ---+---+-
    | | Russell King --- ---
    | | | | / / |
    | +-+-+ --- -+-
    / | THE developer of ARM Linux |+| /|\
    / | | | --- |
    +-+-+ ------------------------------------------------- /\\\ |

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