Re: [Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes

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Re: [Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes

From:	Richard W.M. Jones
Subject:	Re: [Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes
Date:	Thu, 14 Jun 2012 18:13:11 +0100
User-agent:	Mutt/1.5.21 (2010-09-15)
On Thu, Jun 14, 2012 at 05:58:04PM +0200, Alexander Graf wrote:
> [CC'ing qemu-ppc]
> 
> On 06/14/2012 05:52 PM, Richard W.M. Jones wrote:
> >I found last week that qemu-system-ppc64 (from git) hangs occasionally
> >under load, and I have a reproducer for it now.  Unfortunately the
> >reproducer really takes a long time to run -- usually I can get a hang
> >in under 12 hours.
> >
> >Here is the reproducer case:
> >
> >   https://lists.fedoraproject.org/pipermail/ppc/2012-June/001698.html
> >
> >Notes:
> >
> >(1) Verified by one other person (other than me).  Happens on both
> >     ppc64 and x86-64 host.
> >
> >(2) Happens with both Fedora guest kernel 3.3.4-5.fc17.ppc64 and kernel
> >     3.5.0 that I compiled myself.  The test case above contains 3.3.4-5.
> >
> >(3) Seems to be a problem in qemu, not the guest.  The reason I think
> >     this is because I tried to capture a backtrace of the hang using
> >     remote gdb, but gdb just hung when trying to connect to qemu
> >     (gdb connects fine before the bug happens).
> >
> >(4) Judging by guest messages, appears to be happening when writing
> >     to the disk.
> 
> Can you please try to see if you can repdudice this using vscsi /
> vio instead of virtio? I couldn't quite see why vio would be any
> more stable than virtio though ...

I just tried virtio-scsi, but only the first disk shows up.  I added
two disks.  See below for detailed logs.  This works fine on x86-64.
Should I file a separate bug for this?

> Also, could you please try and see if it works reliably using KVM?
> Maybe we're just encountering some TCG breakage here.

I will try this, but as discussed on IRC last week there's some
problem with the Fedora host kernel where /dev/kvm doesn't show up,
even though the kernel is supposedly compiled with KVM PR enabled.  So
I need to fix that first.

Rich.

virtio scsi on ppc64
--------------------

qemu command line:

/home/rjones/d/qemu/ppc64-softmmu/qemu-system-ppc64 \
    -global virtio-blk-pci.scsi=off \
    -nodefconfig \
    -nodefaults \
    -nographic \
    -device virtio-scsi-pci,id=scsi \
    -drive file=test1.img,cache=off,format=raw,id=hd0,if=none \
    -device scsi-hd,drive=hd0 \
    -drive 
file=/home/rjones/d/libguestfs/.guestfs-1000/root.26645,snapshot=on,id=appliance,if=none,cache=unsafe
 \
    -device scsi-hd,drive=appliance \
    -M pseries \
    -enable-kvm \
    -machine accel=kvm:tcg \
    -m 500 \
    -no-reboot \
    -device virtio-serial \
    -serial stdio \
    -chardev 
socket,path=/home/rjones/d/libguestfs/libguestfscoRCTO/guestfsd.sock,id=channel0
 \
    -device virtserialport,chardev=channel0,name=org.libguestfs.channel.0 \
    -kernel /home/rjones/d/libguestfs/.guestfs-1000/kernel.26645 \
    -initrd /home/rjones/d/libguestfs/.guestfs-1000/initrd.26645 \
    -append 'panic=1 console=ttyS0 udevtimeout=600 no_timer_check acpi=off 
printk.time=1 cgroup_disable=memory root=/dev/sdb selinux=0 guestfs_verbose=1 
TERM=screen '

guest kernel output:

  Welcome to Open Firmware

  Copyright (c) 2004, 2011 IBM Corporation All rights reserved.
  This program and the accompanying materials are made available
  under the terms of the BSD License available at
  http://www.opensource.org/licenses/bsd-license.php

Booting from memory...
OF stdout device is: /vdevice/address@hidden
Preparing to boot Linux version 3.3.4-5.fc17.ppc64 (address@hidden) (gcc 
version 4.7.0 20120504 (Red Hat 4.7.0-4) (GCC) ) #1 SMP Mon May 14 10:18:37 MST 
2012
Detected machine type: 0000000000000101
Max number of cores passed to firmware: 1024 (NR_CPUS = 1024)
Calling ibm,client-architecture-support... not implemented
couldn't open /packages/elf-loader
command line: panic=1 console=ttyS0 udevtimeout=600 no_timer_check acpi=off 
printk.time=1 cgroup_disable=memory root=/dev/sdb selinux=0 guestfs_verbose=1 
TERM=screen 
memory layout at init:
  memory_limit : 0000000000000000 (16 MB aligned)
  alloc_bottom : 0000000001a50000
  alloc_top    : 000000001f400000
  alloc_top_hi : 000000001f400000
  rmo_top      : 000000001f400000
  ram_top      : 000000001f400000
instantiating rtas at 0x000000001cff0000... done
Querying for OPAL presence... not there.
boot cpu hw idx 0
copying OF device tree...
Building dt strings...
Building dt structure...
Device tree strings 0x0000000001c60000 -> 0x0000000001c605e0
Device tree struct  0x0000000001c70000 -> 0x0000000001c80000
Calling quiesce...
returning from prom_init
[    0.000000] Phyp-dump not supported on this hardware
[    0.000000] Using pSeries machine description
[    0.000000] Using 1TB segments
[    0.000000] Found initrd at 0xc000000001a50000:0xc000000001b7c400
[    0.000000] bootconsole [udbg0] enabled
[    0.000000] CPU maps initialized for 1 thread per core
[    0.000000] Starting Linux PPC64 #1 SMP Mon May 14 10:18:37 MST 2012
[    0.000000] -----------------------------------------------------
[    0.000000] ppc64_pft_size                = 0x18
[    0.000000] physicalMemorySize            = 0x1f400000
[    0.000000] htab_hash_mask                = 0x1ffff
[    0.000000] -----------------------------------------------------
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 3.3.4-5.fc17.ppc64 (address@hidden) (gcc version 
4.7.0 20120504 (Red Hat 4.7.0-4) (GCC) ) #1 SMP Mon May 14 10:18:37 MST 2012

CF000012
Setup Arch[    0.000000] [boot]0012 Setup Arch
[    0.000000] PCI host bridge /address@hidden,0  ranges:
[    0.000000]   IO 0x0000010080000000..0x000001008000ffff -> 0x0000000000000000
[    0.000000]  MEM 0x00000100a0000000..0x00000100bfffffff -> 
0x0000000080000000 
[    0.000000] Zone PFN ranges:
[    0.000000]   DMA      0x00000000 -> 0x00001f40
[    0.000000]   Normal   empty
[    0.000000] Movable zone start PFN for each node
[    0.000000] Early memory PFN ranges
[    0.000000]     0: 0x00000000 -> 0x00001f40

CF000015
Setup Done[    0.000000] [boot]0015 Setup Done
[    0.000000] PERCPU: Embedded 2 pages/cpu @c000000001d00000 s84608 r0 d46464 
u1048576
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total 
pages: 7993
[    0.000000] Policy zone: DMA
[    0.000000] Kernel command line: panic=1 console=ttyS0 udevtimeout=600 
no_timer_check acpi=off printk.time=1 cgroup_disable=memory root=/dev/sdb 
selinux=0 guestfs_verbose=1 TERM=screen 
[    0.000000] Disabling memory control group subsystem
[    0.000000] PID hash table entries: 2048 (order: -2, 16384 bytes)
[    0.000000] freeing bootmem node 0
[    0.000000] Memory: 486336k/512000k available (17920k kernel code, 25664k 
reserved, 1856k data, 2952k bss, 6656k init)
[    0.000000] SLUB: Genslabs=19, HWalign=128, Order=0-3, MinObjects=0, CPUs=1, 
Nodes=256
[    0.000000] Hierarchical RCU implementation.
[    0.000000] NR_IRQS:512 nr_irqs:512 16
[    0.000000] clocksource: timebase mult[1f40000] shift[24] registered
[    0.000000] Console: colour dummy device 80x25
[    0.000000] Phyp-dump not supported on this hardware
[    0.000000] Using pSeries machine description
[    0.000000] Using 1TB segments
[    0.000000] Found initrd at 0xc000000001a50000:0xc000000001b7c400
[    0.000000] bootconsole [udbg0] enabled
[    0.000000] CPU maps initialized for 1 thread per core
[    0.000000] Starting Linux PPC64 #1 SMP Mon May 14 10:18:37 MST 2012
[    0.000000] -----------------------------------------------------
[    0.000000] ppc64_pft_size                = 0x18
[    0.000000] physicalMemorySize            = 0x1f400000
[    0.000000] htab_hash_mask                = 0x1ffff
[    0.000000] -----------------------------------------------------
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 3.3.4-5.fc17.ppc64 (address@hidden) (gcc version 
4.7.0 20120504 (Red Hat 4.7.0-4) (GCC) ) #1 SMP Mon May 14 10:18:37 MST 2012
[    0.000000] [boot]0012 Setup Arch
[    0.000000] PCI host bridge /address@hidden,0  ranges:
[    0.000000]   IO 0x0000010080000000..0x000001008000ffff -> 0x0000000000000000
[    0.000000]  MEM 0x00000100a0000000..0x00000100bfffffff -> 
0x0000000080000000 
[    0.000000] Zone PFN ranges:
[    0.000000]   DMA      0x00000000 -> 0x00001f40
[    0.000000]   Normal   empty
[    0.000000] Movable zone start PFN for each node
[    0.000000] Early memory PFN ranges
[    0.000000]     0: 0x00000000 -> 0x00001f40
[    0.000000] [boot]0015 Setup Done
[    0.000000] PERCPU: Embedded 2 pages/cpu @c000000001d00000 s84608 r0 d46464 
u1048576
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total 
pages: 7993
[    0.000000] Policy zone: DMA
[    0.000000] Kernel command line: panic=1 console=ttyS0 udevtimeout=600 
no_timer_check acpi=off printk.time=1 cgroup_disable=memory root=/dev/sdb 
selinux=0 guestfs_verbose=1 TERM=screen 
[    0.000000] Disabling memory control group subsystem
[    0.000000] PID hash table entries: 2048 (order: -2, 16384 bytes)
[    0.000000] freeing bootmem node 0
[    0.000000] Memory: 486336k/512000k available (17920k kernel code, 25664k 
reserved, 1856k data, 2952k bss, 6656k init)
[    0.000000] SLUB: Genslabs=19, HWalign=128, Order=0-3, MinObjects=0, CPUs=1, 
Nodes=256
[    0.000000] Hierarchical RCU implementation.
[    0.000000] NR_IRQS:512 nr_irqs:512 16
[    0.000000] clocksource: timebase mult[1f40000] shift[24] registered
[    0.000000] Console: colour dummy device 80x25
[    0.000000] console [hvc0] enabled
[    0.000000] console [hvc0] enabled
[    0.041700] pid_max: default: 32768 minimum: 301
[    0.041700] pid_max: default: 32768 minimum: 301
[    0.048107] Security Framework initialized
[    0.048107] Security Framework initialized
[    0.067154] SELinux:  Disabled at boot.
[    0.067154] SELinux:  Disabled at boot.
[    0.084262] Dentry cache hash table entries: 65536 (order: 3, 524288 bytes)
[    0.084262] Dentry cache hash table entries: 65536 (order: 3, 524288 bytes)
[    0.099618] Inode-cache hash table entries: 32768 (order: 2, 262144 bytes)
[    0.099618] Inode-cache hash table entries: 32768 (order: 2, 262144 bytes)
[    0.107083] Mount-cache hash table entries: 4096
[    0.107083] Mount-cache hash table entries: 4096
[    0.155933] Initializing cgroup subsys cpuacct
[    0.155933] Initializing cgroup subsys cpuacct
[    0.156562] Initializing cgroup subsys memory
[    0.156562] Initializing cgroup subsys memory
[    0.161423] Initializing cgroup subsys devices
[    0.161423] Initializing cgroup subsys devices
[    0.162250] Initializing cgroup subsys freezer
[    0.162250] Initializing cgroup subsys freezer
[    0.162992] Initializing cgroup subsys net_cls
[    0.162992] Initializing cgroup subsys net_cls
[    0.163913] Initializing cgroup subsys blkio
[    0.163913] Initializing cgroup subsys blkio
[    0.164843] Initializing cgroup subsys perf_event
[    0.164843] Initializing cgroup subsys perf_event
[    0.169308] ftrace: allocating 21118 entries in 8 pages
[    0.169308] ftrace: allocating 21118 entries in 8 pages
[    0.439808] POWER7 performance monitor hardware support registered
[    0.439808] POWER7 performance monitor hardware support registered
[    0.476013] Brought up 1 CPUs
[    0.476013] Brought up 1 CPUs
[    0.481103] Enabling Asymmetric SMT scheduling
[    0.481103] Enabling Asymmetric SMT scheduling
[    0.552049] devtmpfs: initialized
[    0.552049] devtmpfs: initialized
[    0.673170] atomic64 test passed
[    0.673170] atomic64 test passed
[    0.680501] NET: Registered protocol family 16
[    0.680501] NET: Registered protocol family 16
[    0.686950] IBM eBus Device Driver
[    0.686950] IBM eBus Device Driver
[    0.713306] nvram: No room to create ibm,rtas-log partition, deleting any 
obsolete OS partitions...
[    0.713306] nvram: No room to create ibm,rtas-log partition, deleting any 
obsolete OS partitions...
[    0.714363] nvram: Failed to find or create ibm,rtas-log partition, err -28
[    0.714363] nvram: Failed to find or create ibm,rtas-log partition, err -28
[    0.715042] nvram: No room to create lnx,oops-log partition, deleting any 
obsolete OS partitions...
[    0.715042] nvram: No room to create lnx,oops-log partition, deleting any 
obsolete OS partitions...
[    0.715559] nvram: Failed to find or create lnx,oops-log partition, err -28
[    0.715559] nvram: Failed to find or create lnx,oops-log partition, err -28

Linux ppc64
#1 SMP Mon May 1[    0.720031] CPU Hotplug not supported by firmware - 
disabling.
[    0.720031] CPU Hotplug not supported by firmware - disabling.
[    0.740887] PCI: Probing PCI hardware
[    0.740887] PCI: Probing PCI hardware
[    0.749913] PCI host bridge to bus 0000:00
[    0.749913] PCI host bridge to bus 0000:00
[    0.751921] pci_bus 0000:00: root bus resource [io  0x10000-0x1ffff]
[    0.751921] pci_bus 0000:00: root bus resource [io  0x10000-0x1ffff]
[    0.752932] pci_bus 0000:00: root bus resource [mem 
0x100a0000000-0x100bfffffff]
[    0.752932] pci_bus 0000:00: root bus resource [mem 
0x100a0000000-0x100bfffffff]
[    0.765676] pci_dma_dev_setup_pSeriesLP: no DMA window found for pci 
dev=0000:00:00.0 dn=/address@hidden,0/address@hidden
[    0.765676] pci_dma_dev_setup_pSeriesLP: no DMA window found for pci 
dev=0000:00:00.0 dn=/address@hidden,0/address@hidden
[    0.773227] pci_dma_dev_setup_pSeriesLP: no DMA window found for pci 
dev=0000:00:01.0 dn=/address@hidden,0/address@hidden
[    0.773227] pci_dma_dev_setup_pSeriesLP: no DMA window found for pci 
dev=0000:00:01.0 dn=/address@hidden,0/address@hidden
[    0.787177] opal: Node not found
[    0.787177] opal: Node not found
[    0.831635] bio: create slab <bio-0> at 0
[    0.831635] bio: create slab <bio-0> at 0
[    0.854552] vgaarb: loaded
[    0.854552] vgaarb: loaded
[    0.861796] SCSI subsystem initialized
[    0.861796] SCSI subsystem initialized
[    0.873008] usbcore: registered new interface driver usbfs
[    0.873008] usbcore: registered new interface driver usbfs
[    0.874925] usbcore: registered new interface driver hub
[    0.874925] usbcore: registered new interface driver hub
[    0.877584] usbcore: registered new device driver usb
[    0.877584] usbcore: registered new device driver usb
[    0.915016] NetLabel: Initializing
[    0.915016] NetLabel: Initializing
[    0.915419] NetLabel:  domain hash size = 128
[    0.915419] NetLabel:  domain hash size = 128
[    0.915688] NetLabel:  protocols = UNLABELED CIPSOv4
[    0.915688] NetLabel:  protocols = UNLABELED CIPSOv4
[    0.921383] NetLabel:  unlabeled traffic allowed by default
[    0.921383] NetLabel:  unlabeled traffic allowed by default
[    0.923702] Switching to clocksource timebase
[    0.923702] Switching to clocksource timebase
[    1.354987] NET: Registered protocol family 2
[    1.354987] NET: Registered protocol family 2
[    1.366159] IP route cache hash table entries: 8192 (order: 0, 65536 bytes)
[    1.366159] IP route cache hash table entries: 8192 (order: 0, 65536 bytes)
[    1.385317] TCP established hash table entries: 16384 (order: 2, 262144 
bytes)
[    1.385317] TCP established hash table entries: 16384 (order: 2, 262144 
bytes)
[    1.392258] TCP bind hash table entries: 16384 (order: 2, 262144 bytes)
[    1.392258] TCP bind hash table entries: 16384 (order: 2, 262144 bytes)
[    1.398680] TCP: Hash tables configured (established 16384 bind 16384)
[    1.398680] TCP: Hash tables configured (established 16384 bind 16384)
[    1.399648] TCP reno registered
[    1.399648] TCP reno registered
[    1.400610] UDP hash table entries: 2048 (order: 0, 65536 bytes)
[    1.400610] UDP hash table entries: 2048 (order: 0, 65536 bytes)
[    1.403242] UDP-Lite hash table entries: 2048 (order: 0, 65536 bytes)
[    1.403242] UDP-Lite hash table entries: 2048 (order: 0, 65536 bytes)
[    1.412141] NET: Registered protocol family 1
[    1.412141] NET: Registered protocol family 1
[    1.433824] Unpacking initramfs...
[    1.433824] Unpacking initramfs...
[    1.573433] Freeing initrd memory: 1216k freed
[    1.573433] Freeing initrd memory: 1216k freed
[    1.630513] rtasd: No event-scan on system
[    1.630513] rtasd: No event-scan on system
[    1.631070] rtas_flash: no firmware flash support
[    1.631070] rtas_flash: no firmware flash support
[    1.655977] vio 1000: Warning: IOMMU dma not supported: mask 
0xffffffffffffffff, table unavailable
[    1.655977] vio 1000: Warning: IOMMU dma not supported: mask 
0xffffffffffffffff, table unavailable
[    1.699549] audit: initializing netlink socket (disabled)
[    1.699549] audit: initializing netlink socket (disabled)
[    1.703370] type=2000 audit(1339693465.580:1): initialized
[    1.703370] type=2000 audit(1339693465.580:1): initialized
[    3.032204] HugeTLB registered 16 MB page size, pre-allocated 0 pages
[    3.032204] HugeTLB registered 16 MB page size, pre-allocated 0 pages
[    3.104404] VFS: Disk quotas dquot_6.5.2
[    3.104404] VFS: Disk quotas dquot_6.5.2
[    3.107946] Dquot-cache hash table entries: 8192 (order 0, 65536 bytes)
[    3.107946] Dquot-cache hash table entries: 8192 (order 0, 65536 bytes)
[    3.141488] msgmni has been set to 952
[    3.141488] msgmni has been set to 952
[    3.214786] alg: No test for stdrng (krng)
[    3.214786] alg: No test for stdrng (krng)
[    3.215600] NET: Registered protocol family 38
[    3.215600] NET: Registered protocol family 38
[    3.220598] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 
253)
[    3.220598] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 
253)
[    3.224514] io scheduler noop registered
[    3.224514] io scheduler noop registered
[    3.225117] io scheduler deadline registered
[    3.225117] io scheduler deadline registered
[    3.229341] io scheduler cfq registered (default)
[    3.229341] io scheduler cfq registered (default)
[    3.237937] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[    3.237937] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[    3.250017] virtio-pci 0000:00:00.0: enabling device (0100 -> 0101)
[    3.250017] virtio-pci 0000:00:00.0: enabling device (0100 -> 0101)
[    3.258075] virtio-pci 0000:00:01.0: enabling device (0100 -> 0101)
[    3.258075] virtio-pci 0000:00:01.0: enabling device (0100 -> 0101)
[    3.280311] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    3.280311] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    3.343090] Linux agpgart interface v0.103
[    3.343090] Linux agpgart interface v0.103
[    3.407888] loop: module loaded
[    3.407888] loop: module loaded
[    3.411453] Uniform Multi-Platform E-IDE driver
[    3.411453] Uniform Multi-Platform E-IDE driver
[    3.413501] ide-gd driver 1.18
[    3.413501] ide-gd driver 1.18
[    3.423389] Fixed MDIO Bus: probed
[    3.423389] Fixed MDIO Bus: probed
[    3.429141] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    3.429141] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    3.431142] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    3.431142] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    3.433061] uhci_hcd: USB Universal Host Controller Interface driver
[    3.433061] uhci_hcd: USB Universal Host Controller Interface driver
[    3.436293] usbcore: registered new interface driver usbserial
[    3.436293] usbcore: registered new interface driver usbserial
[    3.439753] USB Serial support registered for generic
[    3.439753] USB Serial support registered for generic
[    3.440652] usbcore: registered new interface driver usbserial_generic
[    3.440652] usbcore: registered new interface driver usbserial_generic
[    3.441405] usbserial: USB Serial Driver core
[    3.441405] usbserial: USB Serial Driver core
[    3.445482] mousedev: PS/2 mouse device common for all mice
[    3.445482] mousedev: PS/2 mouse device common for all mice
[    3.461949] rtc-generic rtc-generic: rtc core: registered rtc-generic as rtc0
[    3.461949] rtc-generic rtc-generic: rtc core: registered rtc-generic as rtc0
[    3.465701] device-mapper: uevent: version 1.0.3
[    3.465701] device-mapper: uevent: version 1.0.3
[    3.471464] device-mapper: ioctl: 4.22.0-ioctl (2011-10-19) initialised: 
address@hidden
[    3.471464] device-mapper: ioctl: 4.22.0-ioctl (2011-10-19) initialised: 
address@hidden
[    3.484305] usbcore: registered new interface driver usbhid
[    3.484305] usbcore: registered new interface driver usbhid
[    3.484850] usbhid: USB HID core driver
[    3.484850] usbhid: USB HID core driver
[    3.491666] ip_tables: (C) 2000-2006 Netfilter Core Team
[    3.491666] ip_tables: (C) 2000-2006 Netfilter Core Team
[    3.502538] TCP cubic registered
[    3.502538] TCP cubic registered
[    3.502971] Initializing XFRM netlink socket
[    3.502971] Initializing XFRM netlink socket
[    3.509428] NET: Registered protocol family 10
[    3.509428] NET: Registered protocol family 10
[    3.535650] Mobile IPv6
[    3.535650] Mobile IPv6
[    3.537592] NET: Registered protocol family 17
[    3.537592] NET: Registered protocol family 17
[    3.538963] Registering the dns_resolver key type
[    3.538963] Registering the dns_resolver key type
[    3.586338] turn off boot console udbg0
[    3.586338] turn off boot console udbg0
[    3.594189] registered taskstats version 1
[    3.602844] rtc-generic rtc-generic: setting system clock to 2012-06-14 
17:04:28 UTC (1339693468)
[    3.603432] Initializing network drop monitor service
[    3.680174] Freeing unused kernel memory: 6656k freed
febootstrap: mounting /proc
febootstrap: uptime: 3.71 33.01
febootstrap: ext2 mini initrd starting up: 3.17 zlib
febootstrap: cmdline: panic=1 console=ttyS0 udevtimeout=600 no_timer_check 
acpi=off printk.time=1 cgroup_disable=memory root=/dev/sdb selinux=0 
guestfs_verbose=1 TERM=screen 
febootstrap: mounting /sys
febootstrap: internal insmod libcrc32c.ko
febootstrap: internal insmod crc-itu-t.ko
febootstrap: internal insmod crc-ccitt.ko
febootstrap: internal insmod crc8.ko
febootstrap: internal insmod crc7.ko
febootstrap: internal insmod scsi_transport_spi.ko
febootstrap: internal insmod sym53c8xx.ko
febootstrap: internal insmod ide-cd_mod.ko
[    4.098426] ide-cd driver 5.00
febootstrap: internal insmod virtio_mmio.ko
febootstrap: internal insmod virtio_balloon.ko
febootstrap: internal insmod virtio-rng.ko
febootstrap: internal insmod virtio_blk.ko
febootstrap: internal insmod virtio_scsi.ko
[    4.164652] scsi0 : Virtio SCSI HBA
febootstrap: internal insmod virtio_net.ko
[    4.273949] scsi 0:0:0:0: Direct-Access     QEMU     QEMU HARDDISK    1.1. 
PQ: 0 ANSI: 5
[    4.321653] sd 0:0:0:0: [sda] 204800 512-byte logical blocks: (104 MB/100 
MiB)
[    4.324749] sd 0:0:0:0: Attached scsi generic sg0 type 0
[    4.342441] sd 0:0:0:0: [sda] Write Protect is off
[    4.347707] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, 
doesn't support DPO or FUA
[    4.412459]  sda: unknown partition table
[    4.442464] sd 0:0:0:0: [sda] Attached SCSI disk

[no more messages after this, febootstrap initramfs is waiting
for /sys/block/sdb to appear so nothing further happens]

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming blog: http://rwmj.wordpress.com
Fedora now supports 80 OCaml packages (the OPEN alternative to F#)
http://cocan.org/getting_started_with_ocaml_on_red_hat_and_fedora
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[Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes, Richard W.M. Jones, 2012/06/14
- Re: [Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes, Alexander Graf, 2012/06/14
  - Re: [Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes, Richard W.M. Jones <=
    - Re: [Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes, Richard W.M. Jones, 2012/06/14
    - Re: [Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes, Alexander Graf, 2012/06/14
    - Re: [Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes, Richard W.M. Jones, 2012/06/14
    - Re: [Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes, Paolo Bonzini, 2012/06/15
    - Re: [Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes, Alexander Graf, 2012/06/28
    - Re: [Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes, Richard W.M. Jones, 2012/06/28
    - Re: [Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes, Richard W.M. Jones, 2012/06/15
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