Re: [Xen-devel] dom0 crash with unstable

To:	Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject:	Re: [Xen-devel] dom0 crash with unstable
From:	"Bryan D. Payne" <bryan@xxxxxxxxxxxx>
Date:	Tue, 6 Oct 2009 14:25:11 -0400
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx
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> What console output do you get?

It's the same as starting dom0 with 4G - 32G of memory, just freezes
at a different place in the boot each time.

> Could you map the RIP values to a symbol with gdb?  From a quick look,
> it seems that most or all of the cpus are at the same place.  No, vcpu 8
> is doing something else at least.

(gdb) x/i 0xffffffff8100930a
0xffffffff8100930a <hypercall_page+778>:        add    %al,(%rax)
(gdb) x/i 0xffffffff811fea48
0xffffffff811fea48 <delay_tsc+62>:      
    cmpq   $0x0,0x632538(%rip)        # 0xffffffff81830f88 <pv_cpu_ops+264>

> What happens if you boot dom0 with fewer cpus?

I tried adding "maxcpus=1" to the linux kernel line in grub.  I used
this in conjunction with the "dom0_mem=2G" option for xen.  Dom0 still
crashes the same as without the maxcpus option.

Just for kicks, I tried a few other options...

* setting mem=4G with dom0_mem=2G seemed still resulted in random dom0 crashing
* setting noapic resulted in a consistent crash within Xen:

(XEN) ----[ Xen-3.5-unstable  x86_64  debug=y  Not tainted ]----
(XEN) CPU:    0
(XEN) RIP:    e008:[<ffff82c48014fe29>] add_pin_to_irq+0x24/0xcc
(XEN) RFLAGS: 0000000000010296   CONTEXT: hypervisor

> Do you have CONFIG_PARAVIRT_SPINLOCKS enabled?

No.

-bryan

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Re: [Xen-devel] dom0 crash with unstable