[Xen-bugs] [Bug 432] New: Hyperthreading enabled causes Xen 3.0 to be unstable

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=432

           Summary: Hyperthreading enabled causes Xen 3.0 to be unstable
           Product: Xen
           Version: unstable
          Platform: x86
        OS/Version: Linux-2.6
            Status: NEW
          Severity: critical
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: ray_cole@xxxxxxx


Using pull from hg as of this morning (12/5/2005).

If I enable hyperthreading on my machine then Xen gets into trouble within
minutes of starting up user domains.  With hyperthreading disabled it ran for
several hours with no problem.

Machine is a Dell Optplex GX280 with 2G of memory.

I get the following on the screen when it hangs:

[<c040acc0>] fn_hash_lookup+0xb0/0xc0
[<c03dba3b>] ip_route_input_slow+0x7cb/0x7e0
[<c0418f08>] br_nf_forward_finish+0xb8/0x140
[<c0413760>] br_forward_finish+0x0/0x70
[<c04192bc>] br_nf_forward_arp+0x17c/0x1c0
[<c013eed6>] buffered_rmqueue+0x106/0x250
[<c03cfb65>] neigh_update+0x235/0x350
[<c03c4214>] kfree_skbmem+0x24/0x30
[<c0400c11>] arp_process+0x61/0x510
[<c0414420>] br_handle_frame_finish+0x0/0x130
[<c04011b7>] arp_rcv+0xf7/0x170
[<c0410fa1>] packet_rcv_spkt+0x151/0x260
[<c03ca9a1>] netif_receive_skb+0x1e1/0x250
[<c012184e>] tasklet_action+0x4a/0xd0
[<c0121555>] __do_softirq+0x95/0xb0
[<c01215bd>] do_softirq+0x4b/0x50
[<c01215bd>] do_IRQ+0x22/0x30
[<c01048b0>] evtchn_do_upcall+0x70/0xa0
[<c0108c68>] hypervisor_callback+0x2c/0x34
[<c01068a2>] xen_idle+0x42/0x90
[<c0106933>] cpu_idle+0x43/0x50
[<c055e85d>] start_kernel+0x18d/0x1d0
[<c055e390>] unknown_bootoption+0x0/0x210
Kernel panic - not synching: BUG!

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