Re: [Xen-devel] Re: [PATCH] pv-grub: fix boot crash when no fb is available

["David P. Quigley" <dpquigl@xxxxxxxxxxxxx>]

On Tue, 2010-04-06 at 23:47 +0200, Samuel Thibault wrote:
> David P. Quigley, le Tue 06 Apr 2010 11:42:20 -0400, a Ãcrit :
> > On Mon, 2010-04-05 at 23:57 +0200, Samuel Thibault wrote:
> > > David P. Quigley, le Mon 05 Apr 2010 11:17:32 -0400, a Ãcrit :
> > > > disk = [ 
> > > > 'tap:tapdisk:aio:/home/dpquigl/SEHostStorage/SEHostStorage-sda.raw,hda,w',
> > > >  ',hdc:cdrom,r' ]
> > > 
> > > This indeed hangs for me. Please try
> > > 
> > > disk = [ 'file:/home/dpquigl/SEHostStorage/SEHostStorage-sda.raw,hda,w' ]
> > > 
> > > Samuel
> > 
> > This did help. I've gotten to a grub prompt now.
> 
> Ok, cool.
> 
> > Apparently there is an issue with blktap2 and pv-grub.
> 
> Well, more precisely, with MiniOS :)
> 
> It seems like a xenbus protocol issue. I don't really have the time to
> investigate further in the blktap2 code to know which end is behaving
> badly (I do not even know where the PV part of it is).  What I do know
> is that according to xenstore-ls, MiniOS says it's initialized, but
> the backend seems stuck in the initwait state, I don't know what it is
> waiting for.
> 
> Samuel
> 
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I just returned from vacation and am working on this again and have run
into a new stumbling block. I managed to solve the booting to the grub
prompt issue (apparently pvgrub can't handle symlinks). The issue now
though is that my image that works fine as an HVM seems to hang. I've
pasted the output below. In there you can see that there is a call trace
for something xen related early on in the kernel boot process. I'm
unsure if this is related to some of the other pvgrub problems I've been
seeing on the list as of late.

Dave

# xm create -c domU-pv.conf 
/usr/lib64/python2.6/site-packages/xen/xm/group.py:23: DeprecationWarning: the 
sets module is deprecated
  from sets import Set
Using config file "./domU-pv.conf".
Started domain SEHostStorage-PV (id=9)
Xen Minimal OS!
  start_info: 0xaa6000(VA)
    nr_pages: 0x20000
  shared_inf: 0xbfa56000(MA)
     pt_base: 0xaa9000(VA)
nr_pt_frames: 0x9
    mfn_list: 0x9a6000(VA)
   mod_start: 0x0(VA)
     mod_len: 0
       flags: 0x0
    cmd_line: (hd0,0)/boot/grub/grub.conf
  stack:      0x965980-0x985980
MM: Init
      _text: 0x0(VA)
     _etext: 0x69794(VA)
   _erodata: 0x8f000(VA)
     _edata: 0x97ae0(VA)
stack start: 0x965980(VA)
       _end: 0x9a5f88(VA)
  start_pfn: ab5
    max_pfn: 20000
Mapping memory range 0xc00000 - 0x20000000
setting 0x0-0x8f000 readonly
skipped 0x1000
MM: Initialise page allocator for baf000(baf000)-20000000(20000000)
MM: done
Demand map pfns at 20001000-2020001000.
Heap resides at 2020002000-4020002000.
Initialising timer interface
Initialising console ... done.
gnttab_table mapped at 0x20001000.
Initialising scheduler
Thread "Idle": pointer: 0x2020002050, stack: 0xcc0000
Initialising xenbus
Thread "xenstore": pointer: 0x2020002800, stack: 0xcd0000
Dummy main: start_info=0x985a80
Thread "main": pointer: 0x2020002fb0, stack: 0xce0000
  Booting 'SEHostStorage (2.6.30.9-102.fc11.x86_64)'

root (hd0,0)
Error ENOENT when reading the backend path device/vkbd/0/backend
WARN: No handler for port 0 when unbinding
WARN: close_port (null) failed rc=-22. ignored
Thread "kbdfront" exited.
 Filesystem type is ext2fs, partition type 0x83
kernel /boot/vmlinuz-2.6.30.9-102.fc11.x86_64 ro root=/dev/sda1 acpi=force
initrd /boot/initrd-2.6.30.9-102.fc11.x86_64.img

close blk: backend=/local/domain/0/backend/vbd/9/768 node=device/vbd/768
Initializing cgroup subsys cpuset
Initializing cgroup subsys cpu
Linux version 2.6.30.9-102.fc11.x86_64 (mockbuild@xxxxxxxxxxxxxxxxxxxxxxxxxxx) 
(gcc version 4.4.1 20090725 (Red Hat 4.4.1-2) (GCC) ) #1 SMP Fri Dec 4 00:18:53 
EST 2009
Command line: ro root=/dev/sda1 acpi=force
KERNEL supported cpus:
  Intel GenuineIntel
  AMD AuthenticAMD
  Centaur CentaurHauls
ACPI in unprivileged domain disabled
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 00000000000a0000 (usable)
 Xen: 00000000000a0000 - 0000000000100000 (reserved)
 Xen: 0000000000100000 - 0000000001f19000 (usable)
 Xen: 0000000001f19000 - 000000000201c000 (reserved)
 Xen: 000000000201c000 - 0000000020000000 (usable)
DMI not present or invalid.
last_pfn = 0x20000 max_arch_pfn = 0x100000000
init_memory_mapping: 0000000000000000-0000000020000000
RAMDISK: 01926000 - 01f19000
ACPI Error (tbxfroot-0219): A valid RSDP was not found [20090320]
No NUMA configuration found
Faking a node at 0000000000000000-0000000020000000
Bootmem setup node 0 0000000000000000-0000000020000000
  NODE_DATA [0000000000008000 - 000000000001cfff]
  bootmap [000000000001d000 -  0000000000020fff] pages 4
(6 early reservations) ==> bootmem [0000000000 - 0020000000]
  #0 [0000000000 - 0000001000]   BIOS data page ==> [0000000000 - 0000001000]
  #1 [000201c000 - 0002031000]   XEN PAGETABLES ==> [000201c000 - 0002031000]
  #2 [0000006000 - 0000008000]       TRAMPOLINE ==> [0000006000 - 0000008000]
  #3 [0001000000 - 00019051a0]    TEXT DATA BSS ==> [0001000000 - 00019051a0]
  #4 [0001926000 - 0001f19000]          RAMDISK ==> [0001926000 - 0001f19000]
  #5 [0000100000 - 00001ea000]          PGTABLE ==> [0000100000 - 00001ea000]
Zone PFN ranges:
  DMA      0x00000000 -> 0x00001000
  DMA32    0x00001000 -> 0x00100000
  Normal   0x00100000 -> 0x00100000
Movable zone start PFN for each node
early_node_map[3] active PFN ranges
    0: 0x00000000 -> 0x000000a0
    0: 0x00000100 -> 0x00001f19
    0: 0x0000201c -> 0x00020000
SMP: Allowing 1 CPUs, 0 hotplNR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:1 
nr_node_ids:1
PERCPU: Allocated 20 4k pages, static data 79584 bytes
Xen: using vcpu_info placement
Built 1 zonelists in Node order, mobility grouping on.  Total pages: 128688
Policy zone: DMA32
Kernel command line: ro root=/dev/sda1 acpi=force
Initializing CPU#0
------------[ cut here ]------------
WARNING: at arch/x86/xen/enlighten.c:482 cvt_gate_to_trap+0x86/0xbe() (Not 
tainted)
Modules linked in:
Pid: 0, comm: swapper Not tainted 2.6.30.9-102.fc11.x86_64 #1
Call Trace:
 [<ffffffff81049505>] warn_slowpath_common+0x84/0x9c
 [<ffffffff81049531>] warn_slowpath_null+0x14/0x16
 [<ffffffff8100aa70>] cvt_gate_to_trap+0x86/0xbe
 [<ffffffff8100ab00>] xen_convert_trap_info+0x58/0x8d
 [<ffffffff8100aef3>] xen_load_idt+0x4c/0x70
 [<ffffffff813d2bf8>] cpu_init+0x11f/0x2ff
 [<ffffffff8100ac30>] ? xen_write_idt_entry+0x46/0xa9
 [<ffffffff8169dde1>] trap_init+0x248/0x251
 [<ffffffff81699bcb>] start_kernel+0x222/0x3f5
 [<ffffffff816992c1>] x86_64_start_reservations+0xac/0xb0
 [<ffffffff8169cc19>] xen_start_kernel+0x4ae/0x4b2
---[ end trace a7919e7f17c0a725 ]---
NR_IRQS:4352 nr_irqs:256
PID hash table entries: 2048 (order: 11, 16384 bytes)
Detected 2992.548 MHz processor.
Console: colour dummy device 80x25
console [tty0] enabled
console [hvc0] enabled
allocated 5242880 bytes of page_cgroup
please try cgroup_disable=memory option if you don't want
Checking aperture...
No AGP bridge found
Memory: 493924k/524288k available (3972k kernel code, 1420k absent, 28944k 
reserved, 2497k data, 1292k init)
SLUB: Genslabs=14, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
installing Xen timer for CPU 0
Calibrating delay loop (skipped), value calculated using timer frequency.. 
5985.09 BogoMIPS (lpj=2992548)
Security Framework initialized
SELinux:  Initializing.
Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
Mount-cache hash table entries: 256
Initializing cgroup subsys ns
Initializing cgroup subsys cpuacct
Initializing cgroup subsys memory
Initializing cgroup subsys devices
Initializing cgroup subsys freezer
Initializing cgroup subsys net_cls
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 6144K
CPU 0/0x0 -> Node 0
CPU: Unsupported number of siblings 4<6>SMP alternatives: switching to UP code
Freeing SMP alternatives: 31k freed
ftrace: converting mcount calls to 0f 1f 44 00 00
ftrace: allocating 19364 entries in 76 pages
Failed to register trace ftrace module notifier
Brought up 1 CPUs
net_namespace: 1952 bytes
Booting paravirtualized kernel on Xen
Xen version: 4.0.0-rc9 (preserve-AD)
Grant table initialized
regulator: core version 0.5
Time: 165:165:165  Date: 165/165/65
NET: Registered protocol family 16
PCI: Fatal: No config space access function found
bio: create slab <bio-0> at 0
ACPI: Interpreter disabled.
xen_balloon: Initialising balloon driver.
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
PCI: System does not support PCI
PCI: System does not support PCI
NetLabel: Initializing
NetLabel:  domain hash size = 128
NetLabel:  protocols = UNLABELED CIPSOv4
NetLabel:  unlabeled traffic allowed by default
pnp: PnP ACPI: disabled
NET: Registered protocol family 2
IP route cache hash table entries: 16384 (order: 5, 131072 bytes)
TCP established hash table entries: 65536 (order: 8, 1048576 bytes)
TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
TCP: Hash tables configured (established 65536 bind 65536)
TCP reno registered
NET: Registered protocol family 1
Trying to unpack rootfs image as initramfs...
Freeing initrd memory: 6092k freed
platform rtc_cmos: registered platform RTC device (no PNP device found)
audit: initializing netlink socket (disabled)
type=2000 audit(1271169982.263:1): initialized
HugeTLB registered 2 MB page size, pre-allocated 0 pages
VFS: Disk quotas dquot_6.5.2
Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
msgmni has been set to 1035
alg: No test for stdrng (krng)
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
pci_hotplug: PCI Hot Plug PCI Core version: 0.5
pciehp: PCI Express Hot Plug Controller Driver version: 0.4
acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
Non-volatile memory driver v1.3
Linux agpgart interface v0.103
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
brd: module loaded
loop: module loaded
input: Macintosh mouse button emulation as /devices/virtual/input/input0
Driver 'sd' needs updating - please use bus_type methods
Driver 'sr' needs updating - please use bus_type methoMounting proc filesystem
Mounting sysfs filesystem
Creating /dev
Creating initial device nodes
Fusion MPT base driver 3.04.07
Copyright (c) 1999-2008 LSI Corporation
Fusion MPT SPI Host driver 3.04.07



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