Hi, all,

My desktop is f21/Xen 4.4 and the Dom0 crashes if it's 3.17.8-300 or later.  
3.17.7-300 is stable.  The crashing Dom0 kernels are stable as baremetal 
kernels.

I've tried getting 3.18 from -testing and rebuilding 4.4 locally and get the 
same thing.  

Serial output here:
 http://fpaste.org/173093/

Looking for ideas about what could be going on and/or how to figure out what is 
going wrong once Dom0 starts.  

(XEN) Command line: placeholder dom0_mem=12288M,max:12288M loglvl=all 
guest_loglvl=all com1=115200,8n1 console=com1,vga
[    0.000000] Command line: placeholder 
root=/dev/mapper/luks-ba790367-2232-475a-ae19-82bbf7f7ccc5 ro earlyprintk=xen 
ipv6.disable=1 selinux=0 elevator=deadline rootflags=data=journal,relatime

The last lines are:
(XEN) PCI add device 0000:04:00.0
(XEN) Domain 0 crashed: rebooting machine in 5 seconds.

and device 4:00.0 is the USB controller, but I suspect it's what's happening 
next that's crashing.

The baremetal boot near there is:

[    0.217464] pci 0000:04:00.0: [1b21:1142] type 00 class 0x0c0330
[    0.217488] pci 0000:04:00.0: reg 0x10: [mem 0xf7800000-0xf7807fff 64bit]
[    0.217611] pci 0000:04:00.0: PME# supported from D3cold
[    0.217635] pci 0000:04:00.0: System wakeup disabled by ACPI
[    0.219323] pci 0000:00:1c.6: PCI bridge to [bus 04]
[    0.219395] pci 0000:00:1c.6:   bridge window [mem 0xf7800000-0xf78fffff]
[    0.219416] acpi PNP0A08:00: Disabling ASPM (FADT indicates it is 
unsupported)
[    0.220032] ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 10 *11 12 14 15)
[    0.220266] ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 10 11 12 14 15) 
*0, disabled.
[    0.220573] ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 10 *11 12 14 15)
[    0.220803] ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 *10 11 12 14 15)
[    0.221032] ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 *5 6 10 11 12 14 15)
[    0.221264] ACPI: PCI Interrupt Link [LNKF] (IRQs 3 4 5 6 10 11 12 14 15) 
*0, disabled.
[    0.221569] ACPI: PCI Interrupt Link [LNKG] (IRQs *3 4 5 6 10 11 12 14 15)
[    0.221799] ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 5 6 *10 11 12 14 15)
[    0.222099] ACPI: Enabled 5 GPEs in block 00 to 3F
[    0.222252] vgaarb: setting as boot device: PCI:0000:00:02.0
[    0.222321] vgaarb: device added: 
PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none

but I don't know enough about Xen boot to know if that's even useful 
information.

Thanks,
-Bill

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