Wondering is anyone has seen anything like this. I was running 4 netperf 
workloads in 4 domUs, EM64T, 8 cpu threads, with x86_64 xen.
-Andrew
changeset:
7160
dd87869f877ca9c68c97f36b3870908fb279edb9
(XEN) DOM0: (file=mm.c, line=1624) Unknown domain '39172'
(XEN) DOM0: (file=mm.c, line=1624) Unknown domain '2225'
(XEN) DOM0: (file=mm.c, line=1624) Unknown domain '47099'
(XEN) DOM0: (file=mm.c, line=1624) Unknown domain '30292'
(XEN) DOM0: (file=mm.c, line=1624) Unknown domain '14722'
(XEN) DOM0: (file=mm.c, line=1624) Unknown domain '37594'
(XEN) DOM0: (file=mm.c, line=1624) Unknown domain '37414'
(XEN) DOM0: (file=mm.c, line=1624) Unknown domain '28997'
(XEN) DOM0: (file=mm.c, line=1624) Unknown domain '36657'
(XEN) DOM0: (file=mm.c, line=1624) Unknown domain '16098'
(XEN) DOM0: (file=mm.c, line=1624) Unknown domain '12545'
(XEN) DOM0: (file=mm.c, line=1624) Unknown domain '728'
(XEN) DOM0: (file=mm.c, line=2066) Bad __copy_from_user
(XEN) DOM0: (file=mm.c, line=2244) Invalid page update command 2
(XEN) gnttab_transfer: Bad page values 00000000000cedca: ed=ffff830000fed080
(0)1----------- [cut here ] --------- [please bite here ] ---------
Kernel BUG at "drivers/xen/netback/netback.c":314
invalid operand: 0000 [1]
CPU 0
Modules linked in: video thermal processor fan button battery ac tg3
Pid: 0, comm: swapper Not tainted 2.6.12-xen0-up
RIP: e030:[<ffffffff802cc7d3>] <ffffffff802cc7d3>{net_rx_action+1043}
RSP: e02b:ffffffff80611b88 EFLAGS: 00010202
RAX: 0000000000000042 RBX: ffff88001f3dc980 RCX: ffffffff802cc7bd
RDX: ffffffff80611dd8 RSI: ffffffff805db9a0 RDI: 0000000000000004
RBP: ffff880012e3f012 R08: 0000000000000000 R09: ffff880012df5b60
R10: 0000000000000003 R11: 000000001fc40042 R12: ffff88002fd51b60
R13: ffffffff805dd9a8 R14: ffffffff805db9ac R15: 0000000000000000
FS: 00002aaaab3e51a0(0000) GS:ffffffff805fe300(0000) knlGS:ffffffff80377e80
CS: e033 DS: 0000 ES: 0000
Process swapper (pid: 0, threadinfo ffffffff80610000, task ffffffff804cad80)
Stack: ffffffff805e2720 0000000000000136 0000000000000136 00000000000a9de6
 0000000000004d80 ffffffff805ddd08 0000000000000000 ffff880025af2000
 ffffffff805f6540 ffffffff803e77c4
Call Trace:<ffffffff803e77c4>{nf_hook_slow+100} 
<ffffffff80429b80>{br_nf_pre_ro} 
<ffffffff8042ac3d>{br_nf_pre_routing+1741} <ffffffff803e71ac>{nf_iterate} 
<ffffffff80425e30>{br_handle_frame_finish+0} <ffffffff803e77c4>{nf_hook_} 
<ffffffff80425e30>{br_handle_frame_finish+0} <ffffffff804260f2>{br_handl} 
<ffffffff803df325>{netif_receive_skb+357} <ffffffff8800b0d5>{:tg3:tg3_po} 
<ffffffff80135bb9>{tasklet_action+105} <ffffffff80135ce0>{__do_softirq+1} 
<ffffffff80135d9d>{do_softirq+61} <ffffffff801150a9>{do_IRQ+57}
 <ffffffff8010dab6>{evtchn_do_upcall+118} 
<ffffffff801189a2>{get_nsec_off} 
<ffffffff80112055>{do_hypervisor_callback+17} <ffffffff801103a3>{xen_idl} 
<ffffffff801103a3>{xen_idle+83} <ffffffff801103df>{cpu_idle+31}
 <ffffffff8061279f>{start_kernel+495} 
<ffffffff8061218b>{_sinittext+395}
Code: 0f 0b 40 c3 48 80 ff ff ff ff 3a 01 90 41 0f b7 06 45 8b 51
RIP <ffffffff802cc7d3>{net_rx_action+1043} RSP <ffffffff80611b88>
 <0>Kernel panic - not syncing: Oops
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