[Xen-bugs] [Bug 366] kernel BUG at arch/xen/kernel/smpboot.c:186 (vcpu_prepare)!

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=366





------- Additional Comments From grimm@xxxxxxxxxx  2005-11-18 23:16 -------
-changeset 7855
-Jun's patches applied
-apic=bigsmp
-pae enabled
-debug=y
-tried mem=1G, mem=4G, mem=8G ... still see the problem

With SMP on and PAE off, 32 processors boots fine.
With SMP on and PAE on, 8 processors will boot.  But, gradually increasing the
processors causes the problem below to happen.  It seems to be some kind of race
because around 16 cpus will sometimes boot and sometimes not.  cpus>16 has never
booted. 

Dom0 pauses for a while (minutes) after the "Initializing the CPUs" message and
then spits this out:

Unable to handle kernel NULL pointer dereference at virtual address 00000c04
 printing eip:
c0136821
014f7000 -> *pde = 00000000:0f4f8001
014f8000 -> *pme = 00000000:00000000
Oops: 0000 [#1]
PREEMPT SMP
Modules linked in:
CPU:    0
EIP:    0061:[<c0136821>]    Not tainted VLI
EFLAGS: 00010246   (2.6.12.6-xen0)
EIP is at queue_work+0x31/0xc0
eax: 00000c04   ebx: 00000000   ecx: 00000000   edx: c05073e0
esi: 00000000   edi: 00000000   ebp: c0270aa0   esp: c058bef4
ds: 007b   es: 007b   ss: 0069
Process swapper (pid: 0, threadinfo=c058a000 task=c04f0280)
Stack: 00000000 0000db2b 00000000 0000db2b 00000000 00000101 c1004da0 c012f171
       00000000 00000000 00000000 c058bf9c c058a000 c058bf28 c058bf28 c057fd48
       00000001 c058a000 c05eaea0 c012a0f4 c057fd48 0000000a 00000000 c058a000
Call Trace:
 [<c012f171>] run_timer_softirq+0x101/0x210
 [<c012a0f4>] __do_softirq+0xa4/0x160
 [<c012a21b>] do_softirq+0x6b/0x90
 [<c012a335>] irq_exit+0x45/0x50
 [<c010f062>] do_IRQ+0x22/0x30
 [<c01049be>] evtchn_do_upcall+0x9e/0xe0
 [<c010a13c>] hypervisor_callback+0x2c/0x34
 [<c0107866>] xen_idle+0x46/0xa0
 [<c0107902>] cpu_idle+0x42/0x60
 [<c058ca6a>] start_kernel+0x1ba/0x230
 [<c058c390>] unknown_bootoption+0x0/0x210
Code: 14 89 c6 b8 00 e0 ff ff 89 5c 24 10 89 7c 24 18 21 e0 ff 40 14 8b 48 10 f
 <0>Kernel panic - not syncing: Fatal exception in interrupt
 stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
stop_this_cpu disable_local_APIC
 


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