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[Xen-devel] Regression, host crash with 4.5rc1

Hi all,
I've got a Windows 7 x64 VM that is stable on 4.4.1 but crashes the host after a few hours on 4.5rc1. The machine is a ThinkStation D20, an X5660 with 5500-series chipset with an Nvidia Quadro FX4800 (genuine) passed through. Distro is Debian Jessie running stock distro kernel and seabios. Both 4.4.1 and 4.5rc1 were built from source. Apologies if this issue has already been spotted but I can't keep up with the traffic on this list! :-)
It looks as if something is stepping on PCI devices when the crash happens. In the log included below, it's the SATA system that's complaining but I've seen it hit the ethernet chip first, then SATA after that. I'm happy to troubleshoot, apply patches, give more information, etc.
I've seen the crash when running Windows Update, when running the Unigine graphics benchmark, when running an Avast anti-virus scan. Haven't found a common thread.
Don, one curious thing I noted which may be of no value whatsoever: Under 4.4.1, I can't give the VM > 3.5 gigs of RAM without breaking VGA passthrough. Under 4.5rc1 I can give the VM more than 3.5 gigs, yet I *don't* need to use the "mmio_hole" settings in the VM config. Not sure why or what that might signify, if anything. 

Possibly useful information follows.

Thanks,

Steve

===================

windows_vm.cfg:

builder='hvm'
memory = 3584
vcpus = 6
shadow_memory = 64
name = "clippy2"
vif = [ 'bridge=br0, mac=00:16:3f:7a:d0:85' ]
acpi = 1
apic = 1
disk = [ 'phy:/dev/vg_g2/wintest,hda,w', 'file:/home/steve/X17-59465.iso,hdc:cdrom,r' ] 
gfx_passthru=0
pci = ['02:00.0']
viridian = 1
localtime=1
boot="cd"
usb=1
usbdevice=['tablet', 'host:17ef:6009']
vnc=1
vnclisten="10.0.0.21"
vncconsole=0
vncpasswd=''
serial='pty'

root@g2:~# xl info
host                   : g2
release                : 3.16-3-amd64
version                : #1 SMP Debian 3.16.5-1 (2014-10-10)
machine                : x86_64
nr_cpus                : 6
max_cpu_id             : 5
nr_nodes               : 1
cores_per_socket       : 6
threads_per_core       : 1
cpu_mhz                : 2800
hw_caps : bfebfbff:2c100800:00000000:00003f00:029ee3ff:00000000:00000001:00000000 
virt_caps              : hvm hvm_directio
total_memory           : 49143
free_memory            : 754
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 5
xen_extra              : -rc1
xen_version            : 4.5-rc1
xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : Fri Oct 24 10:22:40 2014 -0400 git:1b068a5
xen_commandline : placeholder cpufreq=xen:ondemand cpuidle clocksource=hpet log_lvl=all guest_loglvl=all xen-pciback.hide=(02:00.0) iommu=no-intremap 
cc_compiler            : gcc (Debian 4.9.1-16) 4.9.1
cc_compile_by          : steve
cc_compile_domain      :
cc_compile_date        : Thu Oct 30 15:43:54 PDT 2014
xend_config_format     : 4
(Note that the hide command in the xen_commandline is a no-op because xen is compiled in this kernel as modules.) 

root@g2:~# xl dmesg
 Xen 4.5-rc1
(XEN) Xen version 4.5-rc1 (steve@) (gcc (Debian 4.9.1-16) 4.9.1) debug=y Thu Oct 30 15:43:54 PDT 2014 
(XEN) Latest ChangeSet: Fri Oct 24 10:22:40 2014 -0400 git:1b068a5
(XEN) Bootloader: GRUB 2.02~beta2-15
(XEN) Command line: placeholder cpufreq=xen:ondemand cpuidle clocksource=hpet log_lvl=all guest_loglvl=all xen-pciback.hide=(02:00.0) iommu=no-intremap 
(XEN) Video information:
(XEN)  VGA is text mode 80x25, font 8x16
(XEN)  VBE/DDC methods: V2; EDID transfer time: 2 seconds
(XEN) Disc information:
(XEN)  Found 2 MBR signatures
(XEN)  Found 2 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 000000000009a800 (usable)
(XEN)  000000000009a800 - 00000000000a0000 (reserved)
(XEN)  00000000000e0000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 00000000bf7a0000 (usable)
(XEN)  00000000bf7a0000 - 00000000bf7ca000 (ACPI data)
(XEN)  00000000bf7ca000 - 00000000bf7cc000 (ACPI NVS)
(XEN)  00000000bf7cc000 - 00000000c0000000 (reserved)
(XEN)  00000000f8000000 - 00000000fc000000 (reserved)
(XEN)  00000000fec00000 - 00000000fec10000 (reserved)
(XEN)  00000000fee00000 - 00000000fee01000 (reserved)
(XEN)  00000000ff000000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 0000000c40000000 (usable)
(XEN) ACPI: RSDP 000F6A40, 0024 (r2 PTLTD )
(XEN) ACPI: XSDT BF7BF38F, 0084 (r1 LENOVO TC-61     60400D0 LTP        0)
(XEN) ACPI: FACP BF7C98D1, 00F4 (r3 LENOVO TC-61     60400D0 PTL         2)
(XEN) ACPI: DSDT BF7BF413, A43A (r1 LENOVO TC-61     60400D0 MSFT 100000E)
(XEN) ACPI: FACS BF7CBFC0, 0040
(XEN) ACPI: SSDT BF7AF33B, 2694 (r1  INTEL PPM RCM  80000001 INTL 20061109)
(XEN) ACPI: SLIT BF7C99E9, 0030 (r1 Intel  TYLERBRG  60400D0 LOHR       5A)
(XEN) ACPI: TCPA BF7C9A19, 0032 (r1 LENOVO TC-61     60400D0 PTL         0)
(XEN) ACPI: SLIC BF7C9A4B, 0176 (r1 LENOVO TC-61     60400D0 LTP        0)
(XEN) ACPI: SRAT BF7C9BC1, 00E0 (r1 Intel  Tylerbrg  60400D0 PHX.        1)
(XEN) ACPI: DMAR BF7C9CA1, 01C0 (r1 Intel  OEMDMAR   60400D0 LOHR        1)
(XEN) ACPI: APIC BF7C9E61, 00A0 (r1 PTLTD APIC 60400D0 LTP 0) 
(XEN) ACPI: MCFG BF7C9F01, 003C (r1 PTLTD    MCFG    60400D0 LTP        0)
(XEN) ACPI: HPET BF7C9F3D, 0038 (r1 PTLTD  HPETTBL   60400D0 LTP        1)
(XEN) ACPI: BOOT BF7C9F75, 0028 (r1 PTLTD  $SBFTBL$  60400D0 LTP        1)
(XEN) ACPI: ASF! BF7C9F9D, 0063 (r32 LENOVO TC-61     60400D0 PTL         1)
(XEN) System RAM: 49143MB (50322664kB)
(XEN) SRAT: PXM 0 -> APIC 0 -> Node 0
(XEN) SRAT: PXM 0 -> APIC 2 -> Node 0
(XEN) SRAT: PXM 0 -> APIC 4 -> Node 0
(XEN) SRAT: PXM 0 -> APIC 16 -> Node 0
(XEN) SRAT: PXM 0 -> APIC 18 -> Node 0
(XEN) SRAT: PXM 0 -> APIC 20 -> Node 0
(XEN) SRAT: Node 0 PXM 0 0-c0000000
(XEN) SRAT: Node 0 PXM 0 100000000-c40000000
(XEN) NUMA: Using 20 for the hash shift.
(XEN) Domain heap initialised
(XEN) found SMP MP-table at 000f6a70
(XEN) DMI present.
(XEN) Using APIC driver default
(XEN) ACPI: PM-Timer IO Port: 0x1008
(XEN) ACPI: SLEEP INFO: pm1x_cnt[1:1004,1:0], pm1x_evt[1:1000,1:0]
(XEN) ACPI:             wakeup_vec[bf7cbfcc], vec_size[20]
(XEN) ACPI: Local APIC address 0xfee00000
(XEN) ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
(XEN) Processor #0 6:12 APIC version 21
(XEN) ACPI: LAPIC (acpi_id[0x01] lapic_id[0x02] enabled)
(XEN) Processor #2 6:12 APIC version 21
(XEN) ACPI: LAPIC (acpi_id[0x02] lapic_id[0x04] enabled)
(XEN) Processor #4 6:12 APIC version 21
(XEN) ACPI: LAPIC (acpi_id[0x03] lapic_id[0x10] enabled)
(XEN) Processor #16 6:12 APIC version 21
(XEN) ACPI: LAPIC (acpi_id[0x04] lapic_id[0x12] enabled)
(XEN) Processor #18 6:12 APIC version 21
(XEN) ACPI: LAPIC (acpi_id[0x05] lapic_id[0x14] enabled)
(XEN) Processor #20 6:12 APIC version 21
(XEN) ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
(XEN) ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
(XEN) ACPI: LAPIC_NMI (acpi_id[0x02] high edge lint[0x1])
(XEN) ACPI: LAPIC_NMI (acpi_id[0x03] high edge lint[0x1])
(XEN) ACPI: LAPIC_NMI (acpi_id[0x04] high edge lint[0x1])
(XEN) ACPI: LAPIC_NMI (acpi_id[0x05] high edge lint[0x1])
(XEN) ACPI: IOAPIC (id[0x01] address[0xfec00000] gsi_base[0])
(XEN) IOAPIC[0]: apic_id 1, version 32, address 0xfec00000, GSI 0-23
(XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 high edge)
(XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
(XEN) ACPI: IRQ0 used by override.
(XEN) ACPI: IRQ2 used by override.
(XEN) ACPI: IRQ9 used by override.
(XEN) Enabling APIC mode:  Flat.  Using 1 I/O APICs
(XEN) ACPI: HPET id: 0x8086a301 base: 0xfed00000
(XEN) ERST table was not found
(XEN) Using ACPI (MADT) for SMP configuration information
(XEN) SMP: Allowing 6 CPUs (0 hotplug CPUs)
(XEN) IRQ limits: 24 GSI, 1144 MSI/MSI-X
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Detected 2800.195 MHz processor.
(XEN) Initing memory sharing.
(XEN) mce_intel.c:719: MCA Capability: BCAST 1 SER 0 CMCI 1 firstbank 0 extended MCE MSR 0 
(XEN) Intel machine check reporting enabled
(XEN) alt table ffff82d0802d5e90 -> ffff82d0802d6eb0
(XEN) PCI: MCFG configuration 0: base f8000000 segment 0000 buses 00 - 09
(XEN) PCI: MCFG area at f8000000 reserved in E820
(XEN) PCI: Using MCFG for segment 0000 bus 00-09
(XEN) Intel VT-d iommu 0 supported page sizes: 4kB.
(XEN) Intel VT-d Snoop Control not enabled.
(XEN) Intel VT-d Dom0 DMA Passthrough not enabled.
(XEN) Intel VT-d Queued Invalidation enabled.
(XEN) Intel VT-d Interrupt Remapping not enabled.
(XEN) Intel VT-d Shared EPT tables not enabled.
(XEN) I/O virtualisation enabled
(XEN)  - Dom0 mode: Relaxed
(XEN) Interrupt remapping disabled
(XEN) Enabled directed EOI with ioapic_ack_old on!
(XEN) ENABLING IO-APIC IRQs
(XEN)  -> Using old ACK method
(XEN) ..TIMER: vector=0xF0 apic1=0 pin1=2 apic2=-1 pin2=-1
(XEN) Platform timer is 14.318MHz HPET
(XEN) Allocated console ring of 64 KiB.
(XEN) mwait-idle: MWAIT substates: 0x1120
(XEN) mwait-idle: v0.4 model 0x2c
(XEN) mwait-idle: lapic_timer_reliable_states 0xffffffff
(XEN) VMX: Supported advanced features:
(XEN)  - APIC MMIO access virtualisation
(XEN)  - APIC TPR shadow
(XEN)  - Extended Page Tables (EPT)
(XEN)  - Virtual-Processor Identifiers (VPID)
(XEN)  - Virtual NMI
(XEN)  - MSR direct-access bitmap
(XEN)  - Unrestricted Guest
(XEN) HVM: ASIDs enabled.
(XEN) HVM: VMX enabled
(XEN) HVM: Hardware Assisted Paging (HAP) detected
(XEN) HVM: HAP page sizes: 4kB, 2MB, 1GB
(XEN) Brought up 6 CPUs
(XEN) ACPI sleep modes: S3
(XEN) mcheck_poll: Machine check polling timer started.
(XEN) *** LOADING DOMAIN 0 ***
(XEN) elf_parse_binary: phdr: paddr=0x1000000 memsz=0x7c8000
(XEN) elf_parse_binary: phdr: paddr=0x1800000 memsz=0xed000
(XEN) elf_parse_binary: phdr: paddr=0x18ed000 memsz=0x14f40
(XEN) elf_parse_binary: phdr: paddr=0x1902000 memsz=0x614000
(XEN) elf_parse_binary: memory: 0x1000000 -> 0x1f16000
(XEN) elf_xen_parse_note: GUEST_OS = "linux"
(XEN) elf_xen_parse_note: GUEST_VERSION = "2.6"
(XEN) elf_xen_parse_note: XEN_VERSION = "xen-3.0"
(XEN) elf_xen_parse_note: VIRT_BASE = 0xffffffff80000000
(XEN) elf_xen_parse_note: ENTRY = 0xffffffff819021f0
(XEN) elf_xen_parse_note: HYPERCALL_PAGE = 0xffffffff81001000
(XEN) elf_xen_parse_note: FEATURES = "!writable_page_tables|pae_pgdir_above_4gb|writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel" 
(XEN) elf_xen_parse_note: SUPPORTED_FEATURES = 0x90d
(XEN) elf_xen_parse_note: PAE_MODE = "yes"
(XEN) elf_xen_parse_note: LOADER = "generic"
(XEN) elf_xen_parse_note: unknown xen elf note (0xd)
(XEN) elf_xen_parse_note: SUSPEND_CANCEL = 0x1
(XEN) elf_xen_parse_note: HV_START_LOW = 0xffff800000000000
(XEN) elf_xen_parse_note: PADDR_OFFSET = 0x0
(XEN) elf_xen_addr_calc_check: addresses:
(XEN)     virt_base        = 0xffffffff80000000
(XEN)     elf_paddr_offset = 0x0
(XEN)     virt_offset      = 0xffffffff80000000
(XEN)     virt_kstart      = 0xffffffff81000000
(XEN)     virt_kend        = 0xffffffff81f16000
(XEN)     virt_entry       = 0xffffffff819021f0
(XEN)     p2m_base         = 0xffffffffffffffff
(XEN)  Xen  kernel: 64-bit, lsb, compat32
(XEN)  Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 -> 0x1f16000
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN) Dom0 alloc.: 0000000c00000000->0000000c10000000 (12316671 pages to be allocated) 
(XEN)  Init. ramdisk: 0000000c3f0da000->0000000c3ffff86e
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: ffffffff81000000->ffffffff81f16000
(XEN)  Init. ramdisk: ffffffff81f16000->ffffffff82e3b86e
(XEN)  Phys-Mach map: ffffffff82e3c000->ffffffff88cbb928
(XEN)  Start info:    ffffffff88cbc000->ffffffff88cbc4b4
(XEN)  Page tables:   ffffffff88cbd000->ffffffff88d08000
(XEN)  Boot stack:    ffffffff88d08000->ffffffff88d09000
(XEN)  TOTAL:         ffffffff80000000->ffffffff89000000
(XEN)  ENTRY ADDRESS: ffffffff819021f0
(XEN) Dom0 has maximum 6 VCPUs
(XEN) elf_load_binary: phdr 0 at 0xffffffff81000000 -> 0xffffffff817c8000
(XEN) elf_load_binary: phdr 1 at 0xffffffff81800000 -> 0xffffffff818ed000
(XEN) elf_load_binary: phdr 2 at 0xffffffff818ed000 -> 0xffffffff81901f40
(XEN) elf_load_binary: phdr 3 at 0xffffffff81902000 -> 0xffffffff81a1f000
(XEN) Found masked UR signaling on 0000:00:00.0
(XEN) Found masked UR signaling on 0000:00:01.0
(XEN) Found masked UR signaling on 0000:00:03.0
(XEN) Found masked UR signaling on 0000:00:07.0
(XEN) Masked VT-d error signaling on 0000:00:14.0
(XEN) Scrubbing Free RAM on 1 nodes using 6 CPUs
(XEN) ..................................................................done. 
(XEN) Initial low memory virq threshold set at 0x4000 pages.
(XEN) Std. Loglevel: All
(XEN) Guest Loglevel: All
(XEN) Xen is relinquishing VGA console.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xen) 
(XEN) Freed 304kB init memory.
(XEN) Found masked UR signaling on 0000:00:00.0
(XEN) PCI add device 0000:00:00.0
(XEN) Found masked UR signaling on 0000:00:01.0
(XEN) PCI add device 0000:00:01.0
(XEN) Found masked UR signaling on 0000:00:03.0
(XEN) PCI add device 0000:00:03.0
(XEN) Found masked UR signaling on 0000:00:07.0
(XEN) PCI add device 0000:00:07.0
(XEN) Masked VT-d error signaling on 0000:00:14.0
(XEN) PCI add device 0000:00:14.0
(XEN) PCI add device 0000:00:14.1
(XEN) PCI add device 0000:00:14.2
(XEN) PCI add device 0000:00:16.0
(XEN) PCI add device 0000:00:16.1
(XEN) PCI add device 0000:00:16.2
(XEN) PCI add device 0000:00:16.3
(XEN) PCI add device 0000:00:16.4
(XEN) PCI add device 0000:00:16.5
(XEN) PCI add device 0000:00:16.6
(XEN) PCI add device 0000:00:16.7
(XEN) PCI add device 0000:00:1a.0
(XEN) PCI add device 0000:00:1a.1
(XEN) PCI add device 0000:00:1a.7
(XEN) PCI add device 0000:00:1b.0
(XEN) PCI add device 0000:00:1c.0
(XEN) PCI add device 0000:00:1c.4
(XEN) PCI add device 0000:00:1c.5
(XEN) PCI add device 0000:00:1d.0
(XEN) PCI add device 0000:00:1d.1
(XEN) PCI add device 0000:00:1d.2
(XEN) PCI add device 0000:00:1d.3
(XEN) PCI add device 0000:00:1d.7
(XEN) PCI add device 0000:00:1e.0
(XEN) PCI add device 0000:00:1f.0
(XEN) PCI add device 0000:00:1f.2
(XEN) PCI add device 0000:00:1f.3
(XEN) PCI add device 0000:01:00.0
(XEN) PCI add device 0000:02:00.0
(XEN) PCI add device 0000:05:00.0
(XEN) PCI add device 0000:06:00.0
(XEN) PCI add device 0000:07:02.0
(XEN) PCI add device 0000:07:03.0
(XEN) PCI add device 0000:09:00.0
(XEN) PCI add device 0000:0a:0e.0
(d1) HVM Loader
(d1) Detected Xen v4.5-rc1
(d1) Xenbus rings @0xfeffc000, event channel 1
(d1) System requested SeaBIOS
(d1) CPU speed is 2800 MHz
(d1) Relocating guest memory for lowmem MMIO space disabled
(XEN) irq.c:270: Dom1 PCI link 0 changed 0 -> 5
(d1) PCI-ISA link 0 routed to IRQ5
(XEN) irq.c:270: Dom1 PCI link 1 changed 0 -> 10
(d1) PCI-ISA link 1 routed to IRQ10
(XEN) irq.c:270: Dom1 PCI link 2 changed 0 -> 11
(d1) PCI-ISA link 2 routed to IRQ11
(XEN) irq.c:270: Dom1 PCI link 3 changed 0 -> 5
(d1) PCI-ISA link 3 routed to IRQ5
(d1) pci dev 01:2 INTD->IRQ5
(d1) pci dev 01:3 INTA->IRQ10
(d1) pci dev 02:0 INTA->IRQ11
(d1) pci dev 04:0 INTA->IRQ5
(d1) pci dev 05:0 INTA->IRQ10
(d1) No RAM in high memory; setting high_mem resource base to 100000000
(d1) pci dev 05:0 bar 14 size 010000000: 0e000000c
(XEN) memory_map:add: dom1 gfn=e0000 mfn=d0000 nr=10000
(d1) pci dev 03:0 bar 10 size 002000000: 0f0000008
(XEN) memory_map:add: dom1 gfn=f2000 mfn=e8000 nr=2000
(d1) pci dev 05:0 bar 1c size 002000000: 0f2000004
(d1) pci dev 02:0 bar 14 size 001000000: 0f4000008
(XEN) memory_map:add: dom1 gfn=f5000 mfn=ea000 nr=1000
(d1) pci dev 05:0 bar 10 size 001000000: 0f5000000
(d1) pci dev 05:0 bar 30 size 000080000: 0f6000000
(d1) pci dev 04:0 bar 30 size 000040000: 0f6080000
(d1) pci dev 03:0 bar 30 size 000010000: 0f60c0000
(d1) pci dev 03:0 bar 14 size 000001000: 0f60d0000
(d1) pci dev 02:0 bar 10 size 000000100: 00000c001
(d1) pci dev 04:0 bar 10 size 000000100: 00000c101
(d1) pci dev 04:0 bar 14 size 000000100: 0f60d1000
(d1) pci dev 05:0 bar 24 size 000000080: 00000c201
(XEN) ioport_map:add: dom1 gport=c200 mport=3000 nr=80
(d1) pci dev 01:2 bar 20 size 000000020: 00000c281
(d1) pci dev 01:1 bar 20 size 000000010: 00000c2a1
(d1) Multiprocessor initialisation:
(d1)  - CPU0 ... 40-bit phys ... fixed MTRRs ... var MTRRs [1/8] ... done.
(d1)  - CPU1 ... 40-bit phys ... fixed MTRRs ... var MTRRs [1/8] ... done.
(d1)  - CPU2 ... 40-bit phys ... fixed MTRRs ... var MTRRs [1/8] ... done.
(d1)  - CPU3 ... 40-bit phys ... fixed MTRRs ... var MTRRs [1/8] ... done.
(d1)  - CPU4 ... 40-bit phys ... fixed MTRRs ... var MTRRs [1/8] ... done.
(d1)  - CPU5 ... 40-bit phys ... fixed MTRRs ... var MTRRs [1/8] ... done.
(d1) Testing HVM environment:
(d1)  - REP INSB across page boundaries ... passed
(d1)  - GS base MSRs and SWAPGS ... passed
(d1) Passed 2 of 2 tests
(d1) Writing SMBIOS tables ...
(d1) Loading SeaBIOS ...
(d1) Creating MP tables ...
(d1) Loading ACPI ...
(d1) vm86 TSS at fc00a280
(d1) BIOS map:
(d1)  10000-100d3: Scratch space
(d1)  c0000-fffff: Main BIOS
(d1) E820 table:
(d1)  [00]: 00000000:00000000 - 00000000:000a0000: RAM
(d1)  HOLE: 00000000:000a0000 - 00000000:000c0000
(d1)  [01]: 00000000:000c0000 - 00000000:00100000: RESERVED
(d1)  [02]: 00000000:00100000 - 00000000:df800000: RAM
(d1)  HOLE: 00000000:df800000 - 00000000:fc000000
(d1)  [03]: 00000000:fc000000 - 00000001:00000000: RESERVED
(d1) Invoking SeaBIOS ...
(d1) SeaBIOS (version rel-1.7.5-0-ge51488c-20141030_133131-g2)
(d1)
(d1) Found Xen hypervisor signature at 40000100
(d1) Running on QEMU (i440fx)
(d1) xen: copy e820...
(d1) Relocating init from 0x000e05e9 to 0xdf7af370 (size 68548)
(d1) CPU Mhz=2801
(d1) Found 9 PCI devices (max PCI bus is 00)
(d1) Allocated Xen hypercall page at df7ff000
(d1) Detected Xen v4.5-rc1
(d1) xen: copy BIOS tables...
(d1) Copying SMBIOS entry point from 0x00010010 to 0x000f1190
(d1) Copying MPTABLE from 0xfc001200/fc001210 to 0x000f1040
(d1) Copying PIR from 0x00010030 to 0x000f0fc0
(d1) Copying ACPI RSDP from 0x000100b0 to 0x000f0f90
(d1) Using pmtimer, ioport 0xb008
(d1) Scan for VGA option rom
(d1) Running option rom at c000:0003
(XEN) stdvga.c:147:d1v0 entering stdvga and caching modes
(d1) pmm call arg1=0
(d1) Turning on vga text mode console
(d1) SeaBIOS (version rel-1.7.5-0-ge51488c-20141030_133131-g2)
(d1) Machine UUID aa695d3e-9592-4139-929c-5d2857702fa9
(d1) UHCI init on dev 00:01.2 (io=c280)
(d1) Found 0 lpt ports
(d1) Found 1 serial ports
(d1) ATA controller 1 at 1f0/3f4/0 (irq 14 dev 9)
(d1) ATA controller 2 at 170/374/0 (irq 15 dev 9)
(d1) ata0-0: QEMU HARDDISK ATA-7 Hard-Disk (61440 MiBytes)
(d1) Searching bootorder for: /pci@i0cf8/*@1,1/drive@0/disk@0
(d1) DVD/CD [ata1-0: QEMU DVD-ROM ATAPI-4 DVD/CD]
(d1) Searching bootorder for: /pci@i0cf8/*@1,1/drive@1/disk@0
(d1) PS2 keyboard initialized
(d1) USB keyboard initialized
(d1) Initialized USB HUB (1 ports used)
(d1) All threads complete.
(d1) Scan for option roms
(d1) Running option rom at c980:0003
(d1) pmm call arg1=1
(d1) pmm call arg1=0
(d1) pmm call arg1=1
(d1) pmm call arg1=0
(d1) Searching bootorder for: /pci@i0cf8/*@4
(d1)
(d1) Press F12 for boot menu.
(d1)
(d1) Searching bootorder for: HALT
(d1) drive 0x000f0f40: PCHS=16383/16/63 translation=lba LCHS=1024/255/63 s=125829120 
(d1)
(d1) Space available for UMB: ca800-ee800, f0000-f0ee0
(d1) Returned 249856 bytes of ZoneHigh
(d1) e820 map has 6 items:
(d1)   0: 0000000000000000 - 000000000009fc00 = 1 RAM
(d1)   1: 000000000009fc00 - 00000000000a0000 = 2 RESERVED
(d1)   2: 00000000000f0000 - 0000000000100000 = 2 RESERVED
(d1)   3: 0000000000100000 - 00000000df7fd000 = 1 RAM
(d1)   4: 00000000df7fd000 - 00000000df800000 = 2 RESERVED
(d1)   5: 00000000fc000000 - 0000000100000000 = 2 RESERVED
(d1) enter handle_19:
(d1)   NULL
(d1) Booting from Hard Disk...
(d1) Booting from 0000:7c00
(XEN) stdvga.c:151:d1v0 leaving stdvga
(XEN) d1: VIRIDIAN GUEST_OS_ID: vendor: 1 os: 4 major: 6 minor: 1 sp: 1 build: 1db1 
(XEN) d1: VIRIDIAN HYPERCALL: enabled: 1 pfn: 3ffff
(XEN) d1v0: VIRIDIAN APIC_ASSIST: enabled: 1 pfn: 3fffe
(XEN) d1v1: VIRIDIAN APIC_ASSIST: enabled: 1 pfn: 3fffd
(XEN) d1v2: VIRIDIAN APIC_ASSIST: enabled: 1 pfn: 3fffc
(XEN) d1v3: VIRIDIAN APIC_ASSIST: enabled: 1 pfn: 3fffb
(XEN) d1v4: VIRIDIAN APIC_ASSIST: enabled: 1 pfn: 3fffa
(XEN) d1v5: VIRIDIAN APIC_ASSIST: enabled: 1 pfn: 3fff9
(XEN) irq.c:270: Dom1 PCI link 0 changed 5 -> 0
(XEN) irq.c:270: Dom1 PCI link 1 changed 10 -> 0
(XEN) irq.c:270: Dom1 PCI link 2 changed 11 -> 0
(XEN) irq.c:270: Dom1 PCI link 3 changed 5 -> 0
(XEN) memory_map:remove: dom1 gfn=e0000 mfn=d0000 nr=10000
(XEN) memory_map:remove: dom1 gfn=f2000 mfn=e8000 nr=2000
(XEN) memory_map:remove: dom1 gfn=f5000 mfn=ea000 nr=1000
(XEN) ioport_map:remove: dom1 gport=c200 mport=3000 nr=80
(XEN) memory_map:add: dom1 gfn=e0000 mfn=d0000 nr=10000
(XEN) memory_map:add: dom1 gfn=f2000 mfn=e8000 nr=2000
(XEN) memory_map:add: dom1 gfn=f5000 mfn=ea000 nr=1000
(XEN) ioport_map:add: dom1 gport=c200 mport=3000 nr=80
(XEN) grant_table.c:1272:d1v2 Expanding dom (1) grant table from (4) to (32) frames. 
(XEN) irq.c:380: Dom1 callback via changed to GSI 24
(XEN) memory_map:remove: dom1 gfn=e0000 mfn=d0000 nr=10000
(XEN) memory_map:remove: dom1 gfn=f2000 mfn=e8000 nr=2000
(XEN) memory_map:remove: dom1 gfn=f5000 mfn=ea000 nr=1000
(XEN) ioport_map:remove: dom1 gport=c200 mport=3000 nr=80
(XEN) memory_map:add: dom1 gfn=e0000 mfn=d0000 nr=10000
(XEN) memory_map:add: dom1 gfn=f2000 mfn=e8000 nr=2000
(XEN) memory_map:add: dom1 gfn=f5000 mfn=ea000 nr=1000
(XEN) ioport_map:add: dom1 gport=c200 mport=3000 nr=80
(XEN) memory_map:remove: dom1 gfn=e0000 mfn=d0000 nr=10000
(XEN) memory_map:remove: dom1 gfn=f2000 mfn=e8000 nr=2000
(XEN) memory_map:add: dom1 gfn=e0000 mfn=d0000 nr=10000
(XEN) memory_map:add: dom1 gfn=f2000 mfn=e8000 nr=2000

root@g2:~# tail -f /var/log/syslog
Nov 2 21:48:38 g2 kernel: [ 203.011898] ip_tables: (C) 2000-2006 Netfilter Core Team Nov 2 21:48:38 g2 root: /etc/xen/scripts/vif-bridge: Successful vif-bridge online for vif1.0, bridge br0. Nov 2 21:48:38 g2 root: /etc/xen/scripts/vif-bridge: Writing backend/vif/1/0/hotplug-status connected to xenstore. Nov 2 21:48:38 g2 root: /etc/xen/scripts/vif-bridge: add type_if=tap XENBUS_PATH=backend/vif/1/0 Nov 2 21:48:38 g2 kernel: [ 203.233482] device vif1.0-emu entered promiscuous mode Nov 2 21:48:38 g2 kernel: [ 203.236671] br0: port 3(vif1.0-emu) entered forwarding state Nov 2 21:48:38 g2 kernel: [ 203.236677] br0: port 3(vif1.0-emu) entered forwarding state Nov 2 21:48:38 g2 root: /etc/xen/scripts/vif-bridge: Successful vif-bridge add for vif1.0-emu, bridge br0. Nov 2 21:48:39 g2 kernel: [ 204.651250] xen_pciback: vpci: 0000:02:00.0: assign to virtual slot 0 Nov 2 21:48:40 g2 kernel: [ 205.533377] usb 7-1: reset low-speed USB device number 2 using uhci_hcd Nov 2 21:48:53 g2 kernel: [ 218.261360] br0: port 3(vif1.0-emu) entered forwarding state Nov 2 21:49:20 g2 kernel: [ 245.379901] xen-blkback:ring-ref 16383, event-channel 11, protocol 1 (x86_64-abi) Nov 2 21:49:26 g2 kernel: [ 250.836687] IPv6: ADDRCONF(NETDEV_CHANGE): vif1.0: link becomes ready Nov 2 21:49:26 g2 kernel: [ 250.836726] br0: port 2(vif1.0) entered forwarding state Nov 2 21:49:26 g2 kernel: [ 250.836732] br0: port 2(vif1.0) entered forwarding state Nov 2 21:49:28 g2 kernel: [ 253.485368] usb 7-1: reset low-speed USB device number 2 using uhci_hcd Nov 2 21:49:29 g2 kernel: [ 254.101376] usb 7-1: reset low-speed USB device number 2 using uhci_hcd Nov 2 21:49:41 g2 kernel: [ 265.845376] br0: port 2(vif1.0) entered forwarding state Nov 2 22:17:01 g2 /USR/SBIN/CRON[2361]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Nov 2 23:17:01 g2 /USR/SBIN/CRON[2373]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) 
Nov  3 00:00:01 g2 /USR/SBIN/CRON[2387]: (root) CMD (invoke-rc.d atop _cron)
Nov 3 00:17:01 g2 /USR/SBIN/CRON[2423]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Nov 3 00:52:02 g2 kernel: [11207.677448] ata3.00: exception Emask 0x0 SAct 0x1ffc000 SErr 0x0 action 0x6 frozen Nov 3 00:52:02 g2 kernel: [11207.677512] ata3.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.677568] ata3.00: cmd 61/58:70:90:57:23/00:00:04:00:00/40 tag 14 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.677568] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.677637] ata3.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.677686] ata3.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.677740] ata3.00: cmd 61/58:78:e8:57:23/00:00:04:00:00/40 tag 15 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.677740] res 40/00:01:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.677809] ata3.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.677857] ata3.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.677912] ata3.00: cmd 61/58:80:40:58:23/00:00:04:00:00/40 tag 16 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.677912] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.677980] ata3.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.678029] ata3.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.678099] ata3.00: cmd 61/58:88:98:58:23/00:00:04:00:00/40 tag 17 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.678099] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.678231] ata3.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.678295] ata3.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.678365] ata3.00: cmd 61/58:90:f0:58:23/00:00:04:00:00/40 tag 18 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.678365] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.678496] ata3.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.678560] ata3.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.678631] ata3.00: cmd 61/58:98:48:59:23/00:00:04:00:00/40 tag 19 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.678631] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.678761] ata3.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.678826] ata3.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.678896] ata3.00: cmd 61/58:a0:a0:59:23/00:00:04:00:00/40 tag 20 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.678896] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.679026] ata3.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.679090] ata3.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.679160] ata3.00: cmd 61/58:a8:f8:59:23/00:00:04:00:00/40 tag 21 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.679160] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.679291] ata3.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.679355] ata3.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.679425] ata3.00: cmd 61/58:b0:50:5a:23/00:00:04:00:00/40 tag 22 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.679425] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.679556] ata3.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.679620] ata3.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.679690] ata3.00: cmd 61/58:b8:a8:5a:23/00:00:04:00:00/40 tag 23 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.679690] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.679821] ata3.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.679886] ata3.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.679955] ata3.00: cmd 61/18:c0:00:5b:23/00:00:04:00:00/40 tag 24 ncq 12288 out Nov 3 00:52:02 g2 kernel: [11207.679955] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.680090] ata3.00: status: { DRDY }
Nov  3 00:52:02 g2 kernel: [11207.680157] ata3: hard resetting link
Nov 3 00:52:02 g2 kernel: [11207.680170] ata1.00: exception Emask 0x0 SAct 0x3ff800 SErr 0x0 action 0x6 frozen Nov 3 00:52:02 g2 kernel: [11207.680262] ata1.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.680333] ata1.00: cmd 61/58:58:90:57:23/00:00:04:00:00/40 tag 11 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.680333] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.680465] ata1.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.680530] ata1.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.680600] ata1.00: cmd 61/58:60:e8:57:23/00:00:04:00:00/40 tag 12 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.680600] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.680732] ata1.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.680796] ata1.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.680866] ata1.00: cmd 61/58:68:40:58:23/00:00:04:00:00/40 tag 13 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.680866] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.680998] ata1.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.681062] ata1.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.681132] ata1.00: cmd 61/58:70:98:58:23/00:00:04:00:00/40 tag 14 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.681132] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.681264] ata1.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.681353] ata1.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.681428] ata1.00: cmd 61/58:78:f0:58:23/00:00:04:00:00/40 tag 15 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.681428] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.681562] ata1.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.681627] ata1.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.681698] ata1.00: cmd 61/58:80:48:59:23/00:00:04:00:00/40 tag 16 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.681698] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.681830] ata1.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.681895] ata1.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.681965] ata1.00: cmd 61/58:88:a0:59:23/00:00:04:00:00/40 tag 17 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.681965] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.682096] ata1.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.682161] ata1.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.682232] ata1.00: cmd 61/58:90:f8:59:23/00:00:04:00:00/40 tag 18 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.682232] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.682363] ata1.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.682428] ata1.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.682498] ata1.00: cmd 61/58:98:50:5a:23/00:00:04:00:00/40 tag 19 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.682498] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.682630] ata1.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.682695] ata1.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.682765] ata1.00: cmd 61/58:a0:a8:5a:23/00:00:04:00:00/40 tag 20 ncq 45056 out Nov 3 00:52:02 g2 kernel: [11207.682765] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.682897] ata1.00: status: { DRDY }
Nov 3 00:52:02 g2 kernel: [11207.682961] ata1.00: failed command: WRITE FPDMA QUEUED Nov 3 00:52:02 g2 kernel: [11207.683032] ata1.00: cmd 61/18:a8:00:5b:23/00:00:04:00:00/40 tag 21 ncq 12288 out Nov 3 00:52:02 g2 kernel: [11207.683032] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) 
Nov  3 00:52:02 g2 kernel: [11207.683163] ata1.00: status: { DRDY }
Nov  3 00:52:02 g2 kernel: [11207.683229] ata1: hard resetting link
Write failed: Broken pipe
(I was monitoring syslog over a network connection since nothing of value can be saved to disk under the circumstances.) 

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