[BUG] NFS(?) bug in 2.6.16-rc5-mm3

[Joe Feise <jfeise@feise.com>]

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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