I have Ubuntu 9.04 server installed, and I see this problem too:

[199458.249123] Pid: 0, comm: swapper Not tainted 2.6.28-11-server #42-Ubuntu                                                                                                       
[199458.249126] Call Trace:                                                                                                                                                         
[199458.249128]  <IRQ>  [<ffffffff802b694e>] __alloc_pages_internal+0x3ee/0x4f0                                                                                                     
[199458.249144]  [<ffffffff802df8d8>] alloc_slab_page+0x28/0x30                                                                                                                     
[199458.249148]  [<ffffffff802e099a>] new_slab+0x5a/0x210                                                                                                                           
[199458.249152]  [<ffffffff802e1fc8>] __slab_alloc+0x188/0x290                                                                                                                      
[199458.249158]  [<ffffffff805acd0f>] ? __netdev_alloc_skb+0x1f/0x40                                                                                                                
[199458.249161]  [<ffffffff802e2ed7>] __kmalloc_track_caller+0xd7/0x110                                                                                                             
[199458.249165]  [<ffffffff805acd0f>] ? __netdev_alloc_skb+0x1f/0x40                                                                                                                
[199458.249168]  [<ffffffff805ac9ae>] __alloc_skb+0x6e/0x150                                                                                                                        
[199458.249172]  [<ffffffff805acd0f>] __netdev_alloc_skb+0x1f/0x40                                                                                                                  
[199458.249186]  [<ffffffffa0082714>] bnx2_rx_skb+0x74/0x7e0 [bnx2]                                                                                                                 
[199458.249191]  [<ffffffff805ddce4>] ? ip_rcv+0x264/0x2f0                                                                                                                          
[199458.249198]  [<ffffffffa008594e>] bnx2_rx_int+0x44e/0x7b0 [bnx2]                                                                                                                
[199458.249202]  [<ffffffff805ac0aa>] ? __kfree_skb+0x3a/0xa0                                                                                                                       
[199458.249208]  [<ffffffffa0083fd1>] ? bnx2_tx_int+0x151/0x2a0 [bnx2]                                                                                                              
[199458.249214]  [<ffffffff80227818>] ? __trigger_all_cpu_backtrace+0x48/0x50                                                                                                       
[199458.249220]  [<ffffffffa0085d20>] bnx2_poll_work+0x70/0x90 [bnx2]                                                                                                               
[199458.249226]  [<ffffffffa0085db5>] bnx2_poll+0x75/0x1a0 [bnx2]                                                                                                                   
[199458.249231]  [<ffffffff802708b9>] ? getnstimeofday+0x59/0xe0                                                                                                                    
[199458.249236]  [<ffffffff805b6ae4>] net_rx_action+0x104/0x240                                                                                                                     
[199458.249240]  [<ffffffff80256a5c>] __do_softirq+0x9c/0x170                                                                                                                       
[199458.249245]  [<ffffffff80213d8c>] call_softirq+0x1c/0x30                                                                                                                        
[199458.249248]  [<ffffffff80214ffd>] do_softirq+0x5d/0xa0                                                                                                                          
[199458.249251]  [<ffffffff802567dd>] irq_exit+0x8d/0xa0                                                                                                                            
[199458.249255]  [<ffffffff802152c5>] do_IRQ+0xc5/0x110                                                                                                                             
[199458.249258]  [<ffffffff80212bf3>] ret_from_intr+0x0/0x29                                                                                                                        
[199458.249260]  <EOI>  [<ffffffff8021a95a>] ? mwait_idle+0x4a/0x50                                                                                                                 
[199458.249268]  [<ffffffff80210dd2>] ? enter_idle+0x22/0x30
[199458.249272]  [<ffffffff80210e85>] ? cpu_idle+0x65/0xc0
[199458.249277]  [<ffffffff806987a3>] ? start_secondary+0x9e/0xcb