On 19/06/13 14:16, Jeroen van der Ham wrote:
> 
> 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
> 

That's because Justin recently pushed a commit that changed the ad
translation to ada, you should change your /etc/fstab to ada0p2. It's
commit 526f3ad11acb296481215d7c2915b3f30f1844f6.
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