On 19 Jun 2013, at 13:34, Roger Pau Monné <roger....@citrix.com> wrote:
> 
> Could you provide the boot log of the DomU, backtrace, Xen version and
> Dom0 kernel version?

I did not have a console attached when it rebooted, so I did not have a log of 
the initial boot. Now that I did, I see that it fails to mount its root volume.

It had been running previously on pvhvm_v10 for about two weeks without 
problems. I updated my local git, and recompiled the kernel and rebooted. Then 
this happened.


In order:

Booting...
GDB: no debug ports present
KDB: debugger backends: ddb
KDB: current backend: ddb
Copyright (c) 1992-2013 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 10.0-CURRENT #2 r+6ff8d00-dirty: Tue Jun 18 12:55:16 CEST 2013
    root@image01:/usr/obj/root/freebsd/sys/XENHVM amd64
FreeBSD clang version 3.3 (trunk 178860) 20130405
WARNING: WITNESS option enabled, expect reduced performance.
XEN: Hypervisor version 4.0 detected.
CPU: Quad-Core AMD Opteron(tm) Processor 2374 HE (2200.07-MHz K8-class CPU)
  Origin = "AuthenticAMD"  Id = 0x100f42  Family = 0x10  Model = 0x4  Stepping 
= 2
  
Features=0x1781fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,MMX,FXSR,SSE,SSE2,HTT>
  Features2=0x80802001<SSE3,CX16,POPCNT,HV>
  AMD Features=0xe2500800<SYSCALL,NX,MMX+,FFXSR,LM,3DNow!+,3DNow!>
  AMD Features2=0x1f3<LAHF,CMP,CR8,ABM,SSE4A,MAS,Prefetch>
real memory  = 536870912 (512 MB)
avail memory = 472260608 (450 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <Xen HVM>
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
FreeBSD/SMP: 1 package(s) x 2 core(s)
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  2
random device not loaded; using insecure entropy
ioapic0: Changing APIC ID to 1
MADT: Forcing active-low polarity and level trigger for SCI
ioapic0 <Version 1.1> irqs 0-47 on motherboard
kbd1 at kbdmux0
xen_et0: <Xen PV Clock> on motherboard
Event timer "XENTIMER" frequency 1000000000 Hz quality 950
Timecounter "XENTIMER" frequency 1000000000 Hz quality 950
acpi0: <Xen> on motherboard
acpi0: Power Button (fixed)
acpi0: Sleep Button (fixed)
acpi0: reservation of 0, a0000 (3) failed
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
attimer0: <AT timer> port 0x40-0x43 irq 0 on acpi0
Timecounter "i8254" frequency 1193182 Hz quality 0
Event timer "i8254" frequency 1193182 Hz quality 100
atrtc0: <AT realtime clock> port 0x70-0x71 irq 8 on acpi0
Event timer "RTC" frequency 32768 Hz quality 0
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <32-bit timer at 3.579545MHz> port 0x1f48-0x1f4b on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
isab0: <PCI-ISA bridge> at device 1.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX3 WDMA2 controller> port 
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xc300-0xc30f at device 1.1 on pci0
ata0: <ATA channel> at channel 0 on atapci0
ata1: <ATA channel> at channel 1 on atapci0
pci0: <bridge> at device 1.3 (no driver attached)
vgapci0: <VGA-compatible display> mem 
0xf0000000-0xf1ffffff,0xf3000000-0xf3000fff at device 2.0 on pci0
xenpci0: <Xen Platform Device> port 0xc000-0xc0ff mem 0xf2000000-0xf2ffffff irq 
28 at device 3.0 on pci0
xenstore0: <XenStore> on xenpci0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model IntelliMouse Explorer, device ID 4
fdc0: <floppy drive controller> port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on acpi0
fdc0: does not respond
device_attach: fdc0 attach returned 6
uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
uart0: console (9600,n,8,1)
ppc0: <Parallel port> port 0x378-0x37f irq 7 on acpi0
ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode
ppbus0: <Parallel port bus> on ppc0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
orm0: <ISA Option ROM> at iomem 0xc9000-0xc97ff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
fdc0: No FDOUT register!
Timecounters tick every 10.000 msec
xenbusb_front0: <Xen Frontend Devices> on xenstore0
cd0 at ata1 bus 0 scbus1 target 0 lun 0
cd0: <QEMU QEMU DVD-ROM 0.10> Removable CD-ROM SCSI-0 device
cd0: 16.700MB/s transfers (WDMA2, ATAPI 12bytes, PIO 65534bytes)
cd0: cd present [360385 x 2048 byte records]
xn0: <Virtual Network Interface> at device/vif/0 on xenbusb_front0
xn0: Ethernet address: 00:16:3e:2f:b7:22
xn1: <Virtual Network Interface> at device/vif/1 on xenbusb_front0
xn1: Ethernet address: 00:16:3e:3e:64:c5
xenbusb_back0: <Xen Backend Devices> on xenstore0
xctrl0: <Xen Control Device> on xenstore0
xn0: backend features: feature-sg feature-gso-tcp4
xn1: backend features: feature-sg feature-gso-tcp4
xbd0: 20480MB <Virtual Block Device> at device/vbd/768 on xenbusb_front0
xbd0: attaching as ada0
xbd0: disk supports cache flush using: barriers
xbd1: 703MB <Virtual Block Device> at device/vbd/5632 on xenbusb_front0
xbd1: attaching as ada2
xbd1: disk supports cache flush using: barriers
SMP: AP CPU #1 Launched!
WARNING: WITNESS option enabled, expect reduced performance.
Trying to mount root from ufs:/dev/ad0p2 [rw]...
mountroot: waiting for device /dev/ad0p2 ...
Mounting from ufs:/dev/ad0p2 failed with error 19.
Loader variables:
  vfs.root.mountfrom=ufs:/dev/ad0p2
  vfs.root.mountfrom.options=rw

Manual root filesystem specification:
  <fstype>:<device> [options]
      Mount <device> using filesystem <fstype>
      and with the specified (optional) option list.

    eg. ufs:/dev/da0s1a
        zfs:tank
        cd9660:/dev/acd0 ro
          (which is equivalent to: mount -t cd9660 -o ro /dev/acd0 /)

  ?               List valid disk boot devices
  .               Yield 1 second (for background tasks)
  <empty line>    Abort manual input

mountroot>
panic: mountroot: unable to (re-)mount root.
cpuid = 1
KDB: enter: panic
[ thread pid 1 tid 100002 ]
Stopped at      kdb_enter+0x3e: movq    $0,kdb_why
db> trace
Tracing pid 1 tid 100002 td 0xfffffe0003384920
kdb_enter() at kdb_enter+0x3e/frame 0xffffff80002347d0
vpanic() at vpanic+0x146/frame 0xffffff8000234810
panic() at panic+0x43/frame 0xffffff8000234870
vfs_mountroot() at vfs_mountroot+0x1dc7/frame 0xffffff8000234b20
start_init() at start_init+0x62/frame 0xffffff8000234bb0
fork_exit() at fork_exit+0x84/frame 0xffffff8000234bf0
fork_trampoline() at fork_trampoline+0xe/frame 0xffffff8000234bf0
--- trap 0, rip = 0, rsp = 0xffffff8000234cb0, rbp = 0 ---

jeroen@soleus01 ~]$ sudo xm info
host                   : soleus01.soleus.nu
release                : 2.6.32-5-xen-amd64
version                : #1 SMP Mon Oct 3 07:53:54 UTC 2011
machine                : x86_64
nr_cpus                : 8
nr_nodes               : 2
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2200
hw_caps                : 
178bf3ff:efd3fbff:00000000:00001310:00802001:00000000:000037ff:00000000
virt_caps              : hvm
total_memory           : 65534
free_memory            : 6865
node_to_cpu            : node0:0-3
                         node1:4-7
node_to_memory         : node0:3134
                         node1:3731
node_to_dma32_mem      : node0:3128
                         node1:0
max_node_id            : 1
xen_major              : 4
xen_minor              : 0
xen_extra              : .1
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          : unavailable
xen_commandline        : placeholder dom0_mem=1852M
cc_compiler            : gcc version 4.4.5 (Debian 4.4.5-10)
cc_compile_by          : waldi
cc_compile_domain      : debian.org
cc_compile_date        : Wed Jan 12 14:04:06 UTC 2011
xend_config_format     : 4


[jeroen@soleus01 ~]$ uname -a
Linux soleus01.soleus.nu 2.6.32-5-xen-amd64 #1 SMP Mon Oct 3 07:53:54 UTC 2011 
x86_64 GNU/Linux
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