[Lustre-discuss] NFS export problems

[Aaron Knister]

I'm exporting a 33tb lustre mount to various linux and tru64 clients.  
The nfs daemon likes to frequently hang and when for no apparent  
reason. A trace of the hung daemons looks like this--

Dec 18 11:28:20 cpu1 kernel: nfsd          D ffff81081a8e7a70     0  
30252      1         30255 30251 (L-TLB)
Dec 18 11:28:20 cpu1 kernel:  ffff81081a8e7a70 0000000000000000  
0000000000000282 000000000000000a
Dec 18 11:28:20 cpu1 kernel:  ffff81082ae66040 ffffffff802d0ae0  
00016d72d81489b7 000000000000bb71
Dec 18 11:28:20 cpu1 kernel:  ffff81082ae66228 0000000000000000  
7fffffffffffffff ffffffffffffffff
Dec 18 11:28:20 cpu1 kernel: Call Trace:
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff80062113>] __down+0xc3/0xd8
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff800867b0>]  
default_wake_function+0x0/0xe
Dec 18 11:28:20 cpu1 kernel:   
[<ffffffff8875ff28>] :lustre:ll_iget_for_nfs+0x6a8/0x760
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff80061dd1>] __down_failed 
+0x35/0x3a
Dec 18 11:28:20 cpu1 kernel:   
[<ffffffff8874f489>] :lustre:.text.lock.file+0x69/0xa0
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff887603dd>] :lustre:ras_reset 
+0x2d/0xf0
Dec 18 11:28:20 cpu1 kernel:   
[<ffffffff887f1848>] :nfsd:nfsd_acceptable+0x0/0xd8
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff8021663e>] __qdisc_run 
+0x36/0x1bb
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff800d094b>] do_readv_writev 
+0x198/0x295
Dec 18 11:28:20 cpu1 kernel:   
[<ffffffff8874a840>] :lustre:ll_file_write+0x0/0xa20
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff8874ddd8>] :lustre:ll_file_open 
+0xbc8/0xd60
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff887f2725>] :nfsd:nfsd_vfs_write 
+0xf2/0x2e1
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff8874d210>] :lustre:ll_file_open 
+0x0/0xd60
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff8001dea8>] __dentry_open 
+0x101/0x1dc
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff887f2f99>] :nfsd:nfsd_write 
+0xb5/0xd5
Dec 18 11:28:20 cpu1 kernel:   
[<ffffffff887f97a0>] :nfsd:nfsd3_proc_write+0xea/0x109
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff887ef0e9>] :nfsd:nfsd_dispatch 
+0xd7/0x198
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff883e94b5>] :sunrpc:svc_process 
+0x43c/0x6fa
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff80061d1c>] __down_read+0x12/0x92
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff887ef471>] :nfsd:nfsd+0x0/0x327
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff887ef624>] :nfsd:nfsd 
+0x1b3/0x327
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff8005bc25>] child_rip+0xa/0x11
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff887ef471>] :nfsd:nfsd+0x0/0x327
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff887ef471>] :nfsd:nfsd+0x0/0x327
Dec 18 11:28:20 cpu1 kernel:  [<ffffffff8005bc1b>] child_rip+0x0/0x11

Any ideas?