Using openSUSE 12.1 kernel vanilla 3.7rc2 built from source, with xen front drivers and other xen stuff (same kernel as dom0) using fglrx Possibly triggered the bug by sending some git repositories from dom0 to the domu using "rsync -avHP ..." Here''s a pastebin of the same you see below: http://pastebin.com/CtjxWDsV [ 752.577291] ------------[ cut here ]------------ [ 752.577298] WARNING: at net/core/skbuff.c:3442 skb_try_coalesce+0x383/0x3c0() [ 752.577300] Hardware name: HVM domU [ 752.577301] Modules linked in: xt_tcpudp xt_pkttype xt_LOG xt_limit ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables microcode mperf dm_mod snd_hda_codec_hdmi snd_hda_intel crc32c_intel snd_hda_codec ghash_clmulni_intel snd_ens1370 aesni_intel snd_hwdep gameport ablk_helper cryptd snd_rawmidi snd_seq_device snd_pcm lrw aes_x86_64 xts joydev gf128mul snd_timer ata_generic snd hid_generic ppdev ata_piix parport_pc soundcore parport snd_page_alloc i2c_piix4 button floppy pcspkr autofs4 usbhid ohci_hcd uhci_hcd ehci_hcd usbcore processor thermal_sys usb_common [last unloaded: microcode] [ 752.577340] Pid: 3045, comm: sshd Tainted: G W 3.7.0-rc2-1-default #5 [ 752.577341] Call Trace: [ 752.577343] <IRQ> [<ffffffff8109f10a>] warn_slowpath_common+0x7a/0xb0 [ 752.577349] [<ffffffff8109f155>] warn_slowpath_null+0x15/0x20 [ 752.577351] [<ffffffff814e7403>] skb_try_coalesce+0x383/0x3c0 [ 752.577354] [<ffffffff81537caf>] tcp_try_coalesce.part.50+0x2f/0x90 [ 752.577356] [<ffffffff8153ac14>] tcp_queue_rcv+0x104/0x120 [ 752.577358] [<ffffffff8153e048>] tcp_rcv_established+0x408/0x780 [ 752.577361] [<ffffffff81546db1>] tcp_v4_do_rcv+0x141/0x200 [ 752.577362] [<ffffffff81548af9>] tcp_v4_rcv+0x559/0x820 [ 752.577364] [<ffffffff8151e2c5>] ? nf_hook_slow+0x75/0x150 [ 752.577366] [<ffffffff81524500>] ? ip_rcv_finish+0x360/0x360 [ 752.577368] [<ffffffff815245d6>] ip_local_deliver_finish+0xd6/0x270 [ 752.577369] [<ffffffff815248f5>] ip_local_deliver+0x45/0x80 [ 752.577371] [<ffffffff815242b9>] ip_rcv_finish+0x119/0x360 [ 752.577373] [<ffffffff81524b3d>] ip_rcv+0x20d/0x2f0 [ 752.577375] [<ffffffff814f3ab2>] __netif_receive_skb+0x5e2/0x750 [ 752.577376] [<ffffffff814f3c3e>] netif_receive_skb+0x1e/0x80 [ 752.577379] [<ffffffff8147367b>] handle_incoming_queue+0xdb/0xe0 [ 752.577381] [<ffffffff81474349>] xennet_poll+0x279/0x420 [ 752.577382] [<ffffffff81473092>] ? xennet_tx_buf_gc+0x162/0x190 [ 752.577384] [<ffffffff814f5049>] net_rx_action+0x139/0x250 [ 752.577386] [<ffffffff810a75a8>] __do_softirq+0xb8/0x240 [ 752.577389] [<ffffffff81605adc>] call_softirq+0x1c/0x30 [ 752.577391] [<ffffffff8105f325>] do_softirq+0x65/0xa0 [ 752.577392] [<ffffffff810a788e>] irq_exit+0x8e/0xb0 [ 752.577395] [<ffffffff813c7bcf>] xen_evtchn_do_upcall+0x2f/0x40 [ 752.577397] [<ffffffff81605c6d>] xen_hvm_callback_vector+0x6d/0x80 [ 752.577398] <EOI> [<ffffffff81604869>] ? system_call_fastpath+0x16/0x1b [ 752.577400] ---[ end trace 4dbd6f8d2234fde1 ]---