I have now got an oops trace out of this box, which I presume has been the cause of the previously observed hangs.
To my inexperienced eye it looks like it is related to via-rhine. Thanks Mark BUG: unable to handle kernel NULL pointer dereference at virtual address 00000025 printing eip: c0259a57 *pde = 00000000 Oops: 0000 [#1] PREEMPT Modules linked in: nfs cpufreq_userspace nfsd exportfs lockd sunrpc ppdev lp ac battery ipv6 sd_mod cpufreq_ondemand cpufreq_powersave longhaul af_packet tcp_diag inetv CPU: 0 EIP: 0060:[<c0259a57>] Not tainted VLI EFLAGS: 00010246 (2.6.23-rc5 #1) EIP is at tcp_rto_min+0x8/0x12 eax: 000000c8 ebx: c7ab1080 ecx: ffffffee edx: 00000000 esi: c7ab1080 edi: 00000000 ebp: c9a24b20 esp: c0341dec ds: 007b es: 007b fs: 0000 gs: 0033 ss: 0068 Process ssh (pid: 4928, ti=c0341000 task=c963cf90 task.ti=c35b9000) Stack: c0259b1b c7ab1080 c7ab1080 c025a2e8 c030c8a0 c025b906 00000080 00000080 c022f433 cacde032 00000000 00000000 00000001 28419aa8 731a8024 28419b18 00000000 00000000 c011ebc5 28419b18 00000282 028b585b 00000004 cceb3540 Call Trace: [<c0259b1b>] tcp_rtt_estimator+0xba/0x100 [<c025a2e8>] tcp_ack_saw_tstamp+0x14/0x43 [<c025b906>] tcp_ack+0x6aa/0x1726 [<c022f433>] skb_checksum+0x49/0x289 [<c011ebc5>] local_bh_enable+0x5/0x8c [<c025f1bf>] tcp_rcv_established+0x344/0x5ed [<c024b660>] ip_route_input+0x3a/0xcdc [<c0264226>] tcp_v4_do_rcv+0x27/0x31d [<c0266309>] tcp_v4_rcv+0x71a/0x765 [<c024e7b6>] ip_local_deliver+0x159/0x1bf [<c024e630>] ip_rcv+0x44e/0x47b [<c01b9540>] rb_insert_color+0x4c/0xad [<c024e630>] ip_rcv+0x44e/0x47b [<c0115bb4>] enqueue_entity+0x1d2/0x1f3 [<c024e1e2>] ip_rcv+0x0/0x47b [<c023470b>] netif_receive_skb+0x30d/0x38e [<d00d55a8>] rhine_napipoll+0x2a7/0x46d [via_rhine] [<c02368c9>] net_rx_action+0x85/0x171 [<c011ea8e>] __do_softirq+0x35/0x75 [<c010665c>] do_softirq+0x3e/0x8d [<c013c6cc>] handle_level_irq+0x0/0xd0 [<c011ea20>] irq_exit+0x29/0x62 [<c010693b>] do_IRQ+0x94/0xad [<c0104cf3>] common_interrupt+0x23/0x30 ======================= Code: 00 8b 14 24 8b 82 8c 02 00 00 89 82 10 04 00 00 a1 e0 6e 2f c0 89 82 14 04 00 00 83 c4 0c 5b 5e 5f 5d c3 8b 50 44 b8 c8 00 00 00 <f6> 42 25 20 74 03 8b 42 54 c3 EIP: [<c0259a57>] tcp_rto_min+0x8/0x12 SS:ESP 0068:c0341dec Kernel panic - not syncing: Fatal exception in interrupt - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html