it looks like I forgot to set dom0-min-mem to something reasonable in /etc/xen/xend-config.sxp. Yes, that was the problem.
sshd: page allocation failure. order:0, mode:0x20 Call Trace:I rebooted the box (using Xen's CTRL-A 3 times escape sequence) looks like the people on stables get a free month.[ ] __alloc_pages+0x299/0x2b2 [ ] cache_alloc_refill+0x2b2/0x535 [ ] __kmalloc+0xb0/0xf0 [ ] pskb_expand_head+0x51/0x137 [ ] :bridge:br_dev_queue_push_xmit+0x13e/0x1ad [ ] :bridge:br_nf_post_routing+0x17a/0x195 [ ] nf_iterate+0x41/0x7d [ ] :bridge:br_dev_queue_push_xmit+0x0/0x1ad [ ] nf_hook_slow+0x58/0xbc [ ] :bridge:br_dev_queue_push_xmit+0x0/0x1ad [ ] :bridge:br_forward_finish+0x3f/0x51 [ ] :bridge:br_nf_forward_finish+0xf7/0xff [ ] :bridge:br_nf_forward_ip+0x14d/0x15d [ ] nf_iterate+0x41/0x7d [ ] :bridge:br_forward_finish+0x0/0x51 [ ] nf_hook_slow+0x58/0xbc [ ] :bridge:br_forward_finish+0x0/0x51 [ ] :bridge:__br_forward+0x0/0x6d [ ] :bridge:__br_forward+0x59/0x6d [ ] netif_be_start_xmit+0x0/0x4a6 [ ] :bridge:br_flood+0x7d/0xc6 [ ] :bridge:br_handle_frame_finish+0xe3/0xf8 [ ] :bridge:br_nf_pre_routing_finish+0x2ed/0x2fc [ ] :bridge:br_nf_pre_routing_finish+0x0/0x2fc [ ] nf_hook_slow+0x58/0xbc [ ] :bridge:br_nf_pre_routing_finish+0x0/0x2fc [ ] :bridge:br_nf_pre_routing+0x611/0x62f [ ] nf_iterate+0x41/0x7d [ ] :bridge:br_handle_frame_finish+0x0/0xf8 [ ] nf_hook_slow+0x58/0xbc [ ] :bridge:br_handle_frame_finish+0x0/0xf8 [ ] notify_remote_via_irq+0x2b/0x67 [ ] :bridge:br_handle_frame+0x16e/0x1a2 [ ] netif_receive_skb+0x1ca/0x2ea [ ] process_backlog+0xd0/0x182 [ ] net_rx_action+0xe3/0x24b [ ] __do_softirq+0x83/0x117 [ ] call_softirq+0x1c/0x28 [ ] do_softirq+0x6a/0xed [ ] do_hypervisor_callback+0x1e/0x2c [ ] .text.lock.spinlock+0x0/0x8a [ ] key_lookup+0xf/0x68 [ ] lookup_user_key+0x13c/0x1e4 [ ] keyctl_revoke_key+0x14/0x37 [ ] tracesys+0xab/0xb5 Mem-info: DMA per-cpu: cpu 0 hot: high 0, batch 1 used:0 cpu 0 cold: high 0, batch 1 used:0 cpu 1 hot: high 0, batch 1 used:0 cpu 1 cold: high 0, batch 1 used:0 cpu 2 hot: high 0, batch 1 used:0 cpu 2 cold: high 0, batch 1 used:0 cpu 3 hot: high 0, batch 1 used:0 cpu 3 cold: high 0, batch 1 used:0 cpu 4 hot: high 0, batch 1 used:0 cpu 4 cold: high 0, batch 1 used:0 cpu 5 hot: high 0, batch 1 used:0 cpu 5 cold: high 0, batch 1 used:0 cpu 6 hot: high 0, batch 1 used:0 cpu 6 cold: high 0, batch 1 used:0 cpu 7 hot: high 0, batch 1 used:0 cpu 7 cold: high 0, batch 1 used:0 DMA32 per-cpu: cpu 0 hot: high 186, batch 31 used:30 cpu 0 cold: high 62, batch 15 used:11 cpu 1 hot: high 186, batch 31 used:178 cpu 1 cold: high 62, batch 15 used:24 cpu 2 hot: high 186, batch 31 used:168 cpu 2 cold: high 62, batch 15 used:14 cpu 3 hot: high 186, batch 31 used:160 cpu 3 cold: high 62, batch 15 used:12 cpu 4 hot: high 186, batch 31 used:97 cpu 4 cold: high 62, batch 15 used:5 cpu 5 hot: high 186, batch 31 used:146 cpu 5 cold: high 62, batch 15 used:0 cpu 6 hot: high 186, batch 31 used:83 cpu 6 cold: high 62, batch 15 used:5 cpu 7 hot: high 186, batch 31 used:123 cpu 7 cold: high 62, batch 15 used:2 Normal per-cpu: empty HighMem per-cpu: empty Free pages: 5424kB (0kB HighMem) Active:36633 inactive:756 dirty:18 writeback:3 unstable:0 free:1356 slab:28807 mapped:918 pagetables:1660 DMA free:4012kB min:8kB low:8kB high:12kB active:164kB inactive:0kB present:2120kB pages_scanned:8415 all_unreclaimable? yes lowmem_reserve[]: 0 1002 1002 1002 DMA32 free:1412kB min:4044kB low:5052kB high:6064kB active:146368kB inactive:3024kB present:1026160kB pages_scanned:21160 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0 Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0 HighMem free:0kB min:128kB low:128kB high:128kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0 DMA: 1*4kB 1*8kB 0*16kB 1*32kB 0*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 4012kB DMA32: 1*4kB 0*8kB 0*16kB 0*32kB 0*64kB 1*128kB 1*256kB 0*512kB 1*1024kB 0*2048kB 0*4096kB = 1412kB Normal: empty HighMem: empty Swap cache: add 0, delete 0, find 0/0, race 0+0 Free swap = 0kB Total swap = 0kB Free swap: 0kB 264192 pages of RAM 22597 reserved pages 5161 pages shared 0 pages swap cached
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