[Xen-bugs] [Bug 1610] New: [VT-d] Guest with 2 NIC assigned may hang when booting

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1610

           Summary: [VT-d] Guest with 2 NIC assigned may hang when booting
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: jiajun.xu@xxxxxxxxx


Environment:
------------
Service Arch (ia32/ia32e/IA64): ia32/ia32e
Guest Arch (ia32/ia32e/IA64): ia32/ia32e
Guest OS Type (Linux/Windows): Linux
Change Set: 21237
Hardware: Gulftown-HEDT
Other:
xen-changeset:   21237:a167ea374f26

pvops git:
commit a3e7c7b82c09450487a7e7f5f47b165c49474fd4
Merge: f3d5fe8... a47d360...
Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

ioemu git:
commit b5160622517fb2d16d0836172a2e34633c9d94bf
Author: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Date:   Tue Apr 13 12:07:33 2010 +0100

tboot changeset:
changeset:   202:d5bc75984c1d
tag:         tip
user:        Joseph Cihula <joseph.cihula@xxxxxxxxx>
date:        Tue Apr 27 16:29:24 2010 -0700
summary:     Fixed build inconsistencies

Bug detailed description:
--------------------------
With latest Xen, when we assign 2 NICs to guest, the guest may hang when
booting. Sometimes even the guest is up, it may hang after a while. When we
assign 1 NIC to guest, there is no such issue.

There is no error log when guest hang with 2 NICs assigned.

The xm list shows:
#########
[root@vt-nhm2 xen]# xm li
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  3324    12     r-----    796.5
vVTD_ASS2_07_1273199111                     26   512     1     ------      0.0
[root@vt-nhm2 xen]# xm vcpu-list
Name                                ID  VCPU   CPU State   Time(s) CPU Affinity
Domain-0                             0     0     8   -b-     350.1 any cpu
Domain-0                             0     1     9   -b-     110.5 any cpu
Domain-0                             0     2     1   r--      73.8 any cpu
Domain-0                             0     3     2   -b-      47.2 any cpu
Domain-0                             0     4    11   -b-      63.8 any cpu
Domain-0                             0     5    10   -b-      24.5 any cpu
Domain-0                             0     6     4   -b-      32.1 any cpu
Domain-0                             0     7     5   -b-      21.1 any cpu
Domain-0                             0     8     9   -b-      21.8 any cpu
Domain-0                             0     9     7   -b-      22.3 any cpu
Domain-0                             0    10     8   -b-      15.1 any cpu
Domain-0                             0    11     0   -b-      14.6 any cpu
vVTD_ASS2_07_1273199111             26     0     6   ---       0.0 any cpu
#########

On the same machine with following c/s, there is no such issue:
##########
xen-changeset:   21190:7ee8bb40200a

pvops git:
commit a3e7c7b82c09450487a7e7f5f47b165c49474fd4
Merge: f3d5fe8... a47d360...
Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

ioemu git:
commit b5160622517fb2d16d0836172a2e34633c9d94bf
Author: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Date:   Tue Apr 13 12:07:33 2010 +0100
#########

Reproduce steps:
----------------
1. Create a guest with 2 NICs assigned
2. Reboot the guest for multiple times
3. Guest will hang when booting


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