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    Subject[BUG] NFS(?) bug in 2.6.16-rc5-mm3
    In certain cases, when programmatically traversing a directory tree mounted
    through NFS, I get a kernel oops.
    Two examples are listed below.

    -Joe

    BUG: unable to handle kernel paging request at virtual address 0005023c
    printing eip:
    c0169848
    *pde = 00000000
    Oops: 0000 [#1]
    PREEMPT
    last sysfs file: /class/net/eth2/ifindex
    Modules linked in: pl2303 usbserial softdog cisco_ipsec snd_pcm_oss
    snd_mixer_oss snd_cs46xx gameport snd_raw
    midi snd_seq_device snd_ac97_codec snd_ac97_bus snd_pcm snd_timer snd soundcore
    snd_page_alloc zoran i2c_algo
    _bit videodev saa7111 i2c_core pegasus arc4 ppp_mppe ppp_deflate ppp_generic
    slhc usblp
    CPU: 0
    EIP: 0060:[<c0169848>] Tainted: P VLI
    EFLAGS: 00210202 (2.6.16-rc5-mm3 #9)
    EIP is at clear_inode+0x70/0x108
    eax: d8d81a00 ebx: d3f50860 ecx: d8d81a00 edx: 00050238
    esi: d3f50984 edi: 00000002 ebp: ffffe000 esp: f7d8bea8
    ds: 007b es: 007b ss: 0068
    Process kswapd0 (pid: 176, threadinfo=f7d8a000 task=f7d30030)
    Stack: <0>00200296 d3f50860 d8d81a00 c016a853 d3f50860 d3563a20 c016a8e9 d3563a14
    c0167e41 f7d8a000 f7d8a000 00000097 000255a8 c17deac0 c0168230 c013c911
    f7d8bf54 c013a0fd 00000000 012ad400 00000000 0002d036 000255a8 0000006a
    Call Trace:
    <c016a853> generic_forget_inode+0x12a/0x15c <c016a8e9> iput+0x53/0x65
    <c0167e41> prune_dcache+0x12d/0x162 <c0168230> shrink_dcache_memory+0x14/0x37
    <c013c911> shrink_slab+0x131/0x1f7 <c013a0fd> throttle_vm_writeout+0x1e/0x5d
    <c013de1f> balance_pgdat+0x2a9/0x36c <c013dfcf> kswapd+0xed/0x103
    <c012805c> autoremove_wake_function+0x0/0x43 <c0102866> ret_from_fork+0x6/0x14
    <c012805c> autoremove_wake_function+0x0/0x43 <c013dee2> kswapd+0x0/0x103
    <c0100eed> kernel_thread_helper+0x5/0xb
    Code: 01 00 00 a8 08 0f 85 9b 00 00 00 f6 83 2c 01 00 00 20 0f 85 86 00 00 00 8b
    83 90 00 00 00 85 c0 89 c1 7
    4 31 8b 50 24 85 d2 74 1c <8b> 52 04 85 d2 74 15 31 d2 8b b4 93 e4 00 00 00 85
    f6 75 52 83
    ============================================================================
    BUG: unable to handle kernel paging request at virtual address 08ed08b5
    printing eip:
    c016a8b3
    *pde = 00000000
    Oops: 0000 [#2]
    PREEMPT
    last sysfs file: /class/net/eth2/ifindex
    Modules linked in: pl2303 usbserial softdog cisco_ipsec snd_pcm_oss
    snd_mixer_oss snd_cs46xx gameport snd_raw
    midi snd_seq_device snd_ac97_codec snd_ac97_bus snd_pcm snd_timer snd soundcore
    snd_page_alloc zoran i2c_algo
    _bit videodev saa7111 i2c_core pegasus arc4 ppp_mppe ppp_deflate ppp_generic
    slhc usblp
    CPU: 0
    EIP: 0060:[<c016a8b3>] Tainted: P VLI
    EFLAGS: 00010202 (2.6.16-rc5-mm3 #9)
    EIP is at iput+0x1d/0x65
    eax: 08ed08a1 ebx: d3f50a00 ecx: d3f50a18 edx: d3f50a18
    esi: cf443aa0 edi: 00000045 ebp: ffffe000 esp: c821fb90
    ds: 007b es: 007b ss: 0068
    Process dvddump (pid: 4210, threadinfo=c821e000 task=f1599570)
    Stack: <0>cf443a94 c0167e41 c821e000 c821e000 0000010b 00041c58 c17deac0 c0168230
    c013c911 00000000 0001d060 00000000 020e2c00 00000000 00027ae4 00041c58
    000000d4 00000000 00000000 000000d0 00000040 c821fc5c c05a51f0 0000000a
    Call Trace:
    <c0167e41> prune_dcache+0x12d/0x162 <c0168230> shrink_dcache_memory+0x14/0x37
    <c013c911> shrink_slab+0x131/0x1f7 <c013dab9> try_to_free_pages+0xee/0x1ab
    <c0138ea8> __alloc_pages+0x113/0x29c <c014e03c> cache_grow+0x108/0x171
    <c014d344> kmem_getpages+0x2f/0x95 <c014dff8> cache_grow+0xc4/0x171
    <c014e20c> cache_alloc_refill+0x167/0x22c <c014e4cb> kmem_cache_alloc+0x3f/0x41
    <c016826e> d_alloc+0x1b/0x176 <c01688a6> d_lookup+0x19/0x39
    <c022bd94> nfs_readdir_lookup+0xd8/0x34b <c022ab91> nfs_do_filldir+0x5b/0x184
    <c0163484> filldir64+0x0/0xdc <c022afcb> nfs_readdir+0x311/0x7a2
    <c0163484> filldir64+0x0/0xdc <c0150006> sys_faccessat+0x45/0x132
    <c015f233> __link_path_walk+0xc62/0xd4b <c045a61b>
    rpcauth_lookup_credcache+0x7f/0x206
    <c045a801> rpcauth_lookupcred+0x5f/0xb5 <c0286dea>
    radix_tree_gang_lookup_tag+0x49/0x61
    <c028958c> __copy_to_user_ll+0x5b/0x69 <c02896a2> copy_to_user+0x36/0x53
    <c015aa56> cp_new_stat64+0xfa/0x10e <c0239d5f> nfs3_decode_dirent+0x0/0x1ac
    <c0163484> filldir64+0x0/0xdc <c0163214> vfs_readdir+0x94/0xa9
    <c01635cd> sys_getdents64+0x6d/0xc0 <c0162799> do_fcntl+0x9e/0x155
    <c0102997> syscall_call+0x7/0xb
    Code: 85 c9 75 05 e9 4a fd ff ff e9 93 fe ff ff 85 c0 53 89 c3 74 4c 8b 80 90 00
    00 00 83 bb 24 01 00 00 20 8
    b 40 20 74 42 85 c0 74 07 <8b> 50 14 85 d2 75 31 8d 43 24 ba 80 84 68 c0 e8 8d
    a2 11 00 85


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