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    SubjectKernel BUG
    Hi Trond,

    I am running a sparc-linux kernel using an NFS Root and it is falling over
    with the trace below.

    My Kernel is not a standard kernel (I have had to tweek it to get the
    SBUS GC3 and the 82077 floppy to work on my OPUS Sparc 1 clone).

    Can you advise me on any known issues in the NFS Client code that might
    enter NULL pointers into the 'slot->slots[i]' in __lookup_tag.

    If there are none that you are aware of, are there any specific areas that
    I should investigate with printk statements.

    The Kernel is cross compiled on an Athlon 64 3400+ (32bit linux at the
    moment) using GCC-4.0.2 and Binutils-2.16.1. Compilation takes about 10
    minutes so there is no real issue in making changes to the kernel to find
    the source of the problem.

    A compiler/binutils bug should not be ruled out. I might try
    gcc-3.4.3/binutils-2.15.

    Please let me know if you would like further information.

    Regards
    Mark Fortescue.
    --------------------------------------------------------------------------
    kernel BUG at /L64/src/linux-2.6/linux-2.6.13.4-p01/lib/radix-tree.c:575!
    \|/ ____ \|/
    "@'/ ,. \`@"
    /_| \__/ |_\
    \__U_/
    ld(45): Kernel bad trap [#1]
    PSR: 004000c4 PC: f00e0ff4 NPC: f00e0ff8 Y: 00000000 Not tainted
    PC: <radix_tree_gang_lookup_tag+0x144/0x1ac>
    %G: 00000001 f022ec00 f022eccc 00400fe2 f002fd18 f022ec00 ff020000
    00000000
    %O: 0000004d f01fbd78 0000023f 00000000 00000001 00000000 ff021a48
    f00e0fec
    RPC: <radix_tree_gang_lookup_tag+0x13c/0x1ac>
    %L: 00000001 ff021b14 0000003f 00000001 00000002 00000000 ff020000
    e0162000
    %I: 00000000 ff021b14 00000000 00000001 00000008 ff021b10 ff021ab0
    f00b10d4
    Caller[f00b10d4]: nfs_wait_on_requests+0x98/0xb8
    Caller[f00b2a70]: nfs_sync_inode+0x20/0x74
    Caller[f00b063c]: nfs_readpage+0x44/0x44c
    Caller[f004fc8c]: do_generic_mapping_read+0x290/0x564
    Caller[f005084c]: __generic_file_aio_read+0x168/0x1cc
    Caller[f0050a2c]: generic_file_aio_read+0x44/0x54
    Caller[f006e298]: do_sync_read+0x94/0xc8
    Caller[f006e62c]: vfs_read+0xa0/0x15c
    Caller[f006f200]: sys_read+0x30/0x64
    Caller[f001144c]: syscall_is_too_hard+0x34/0x40
    Caller[e0096e58]: 0xe0096e58
    Instruction DUMP: 90122178 7ffcc514 01000000 <91d02005> 9402a001
    80a28010 0280000f c4244001 8600e001

    --------------------------------------------------------------------------


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