From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050513 Fedora/1.0.4-1.3.1 Firefox/1.0.4

Description of problem:
A server that mounts an NFS exported directory from another similarly configured FC3 server ran into an nfs related kernel bug that hung the server:

Kernel info:
2.6.11-1.14_FC3smp #1 SMP Thu Apr 7 19:38:19 EDT 2005 i686 i686 i386 GNU/Linux

nfs-utils-1.0.6-52

The log excerpt is below:


Aug 28 01:25:24 asgdev01 kernel: ------------[ cut here ]------------
Aug 28 01:25:24 asgdev01 kernel: kernel BUG at fs/nfs/inode.c:156!
Aug 28 01:25:24 asgdev01 kernel: invalid operand: 0000 [#1]
Aug 28 01:25:24 asgdev01 kernel: SMP 
Aug 28 01:25:24 asgdev01 kernel: Modules linked in: iptable_filter ip_tables parport_pc lp parport autofs4 nfs 
lockd sunrpc dm_mod video button battery ac md5 ipv6 ohci_hcd i2c_piix4 i2c_core tg3 floppy ext3 jbd aacraid sd_mod scsi_mod
Aug 28 01:25:24 asgdev01 kernel: CPU:    0
Aug 28 01:25:24 asgdev01 kernel: EIP:    0060:[<f8bfcba9>]    Not tainted VLI
Aug 28 01:25:24 asgdev01 kernel: EFLAGS: 00010282   (2.6.11-1.27_FC3smp) 
Aug 28 01:25:24 asgdev01 kernel: EIP is at nfs_clear_inode+0x4e/0x58 [nfs]
Aug 28 01:25:24 asgdev01 kernel: eax: fffffffe   ebx: c84ede24   ecx: 00000268   edx: 00000000
Aug 28 01:25:24 asgdev01 kernel: esi: c84edcf4   edi: 0000000d   ebp: 00000080   esp: f7c8deac
Aug 28 01:25:24 asgdev01 kernel: ds: 007b   es: 007b   ss: 0068
Aug 28 01:25:24 asgdev01 kernel: Process kswapd0 (pid: 199, threadinfo=f7c8d000 task=f7c7d020)
Aug 28 01:25:24 asgdev01 kernel: Stack: 00000002 c84ede24 c018714f c0173ab8 0000000c c84ede24 f7c8dee4 c0173b40
 
Aug 28 01:25:24 asgdev01 kernel:        e9f6015c e9f60154 00000080 c0173e23 00000001 00000080 c94cf15c d72329d4
 
Aug 28 01:25:24 asgdev01 kernel:        00000000 00000082 00000000 f7ffe9c0 c0173f7c c0148ea6 0048da00 00000000
 
Aug 28 01:25:24 asgdev01 kernel: Call Trace:
Aug 28 01:25:24 asgdev01 kernel:  [<c018714f>] dquot_drop+0x0/0x7d
Aug 28 01:25:24 asgdev01 kernel:  [<c0173ab8>] clear_inode+0xcd/0x142
Aug 28 01:25:24 asgdev01 kernel:  [<c0173b40>] dispose_list+0x13/0x72
Aug 28 01:25:24 asgdev01 kernel:  [<c0173e23>] prune_icache+0xb5/0x1fa
Aug 28 01:25:24 asgdev01 kernel:  [<c0173f7c>] shrink_icache_memory+0x14/0x37
Aug 28 01:25:24 asgdev01 kernel:  [<c0148ea6>] shrink_slab+0xf4/0x151
Aug 28 01:25:24 asgdev01 kernel:  [<c014a174>] balance_pgdat+0x24b/0x383
Aug 28 01:25:24 asgdev01 kernel:  [<c014a38a>] kswapd+0xde/0x12e
Aug 28 01:25:24 asgdev01 kernel:  [<c01341d3>] autoremove_wake_function+0x0/0x37
Aug 28 01:25:24 asgdev01 kernel:  [<c01341d3>] autoremove_wake_function+0x0/0x37
Aug 28 01:25:24 asgdev01 kernel:  [<c014a2ac>] kswapd+0x0/0x12e
Aug 28 01:25:24 asgdev01 kernel:  [<c01022f9>] kernel_thread_helper+0x5/0xb
Aug 28 01:25:24 asgdev01 kernel: Code: 75 1f 8b 86 b4 00 00 00 85 c0 74 05 e8 3e fb d5 ff 8b 86 ac 00 00 00 85 
c0 75 10 83 c4 04 5b 5e c3 0f 0b 98 00 cc a9 c1 f8 eb d7 <0f> 0b 9c 00 cc a9 c1 f8 eb e6 8b 80 90 01 00 00 8b 0
0 85 c0 74 


Version-Release number of selected component (if applicable):
kernel-2.6.11-1.14_FC3

How reproducible:
Didn't try


Additional info:

This is the first time I've seen the problem. The server has been used in the same way for about 2 months.  If I can provide any more useful information let me know.