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[Xen-devel] x86_64 dom0 smp broken?



On changeset 7483, actually I haven't been able to boot an SMP dom0 in a 
while, anyway, here's the boot log:

Initializing CPU#6
Brought up 8 CPUs
Initializing CPU#7
ERROR: domain->span does not contain CPU0
ERROR: groups don't span domain->span
ERROR: domain->span does not contain CPU1
ERROR: domain->groups does not contain CPU1
ERROR: empty group
 00
ERROR: group is NULL

CPU2 attaching sched-domain:
Unable to handle kernel NULL pointer dereference at 0000000000000008 RIP:
<7><ffffffff80130d50>{find_busiest_group+96} domain 0: span 00
ERROR: domain->span does not contain CPU2
ERROR: domain->groups does not contain CPU2
  groups:
ERROR: empty group
 00
ERROR: group is NULL

  domain 1: span ff
   groups: ff

PGD 0
Oops: 0000 [1] SMP
CPU 1
Modules linked in:
Pid: 4, comm: migration/1 Not tainted 2.6.12-xen0-smp
RIP: e030:[<ffffffff80130d50>] <ffffffff80130d50>{find_busiest_group+96}
RSP: e02b:ffff880000697d28  EFLAGS: 00010213
RAX: 0000000000000000 RBX: 0000000000000080 RCX: 0000000000000080
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff880000697d98 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff805d1738 R14: 0000000000000008 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffffffff80625980(0000) knlGS:0000000000000000
CS:  e033 DS: 0000 ES: 
0000                                                    )Process migration/1 
(pid: 4, threadinfo ffff880000696000, task ffff880000690750
Stack: ffffffff80686d80 ffffffff80686d80 000000020000d9a7 ffff880000697e70
       ffff88000100cc80 0000000000000000 0000000000000000 0000000000000000
       0000000000000000 
ffff880000690750                                       }Call 
Trace:<ffffffff8045714c>{schedule+684} <ffffffff8012e9d3>{__wake_up_common}     
  
<ffffffff8013120b>{migration_thread+491} <ffffffff80131020>{migration_th
       <ffffffff8014c4a9>{kthread+217} <ffffffff80132020>{schedule_tail+64}
       <ffffffff8011353f>{child_rip+8} <ffffffff8014c3d0>{kthread+0}

-Andrew

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