dom0 won't boot

dom0 won't boot

[Barry Rountree]

I had what was checked in a few days ago working quite well, so I decided to 
wipe the machine and try out two partitions (swap + /) and domains 1+ on 
loopback.

Now, after xen finished booting, the machine reboots.

The only think that's really different is my swap partition is on /dev/sda1 
and my root partition is on /dev/sda5.  But the grub menu looks ok as far as 
I can tell...

I'm running on a dual P3.

bk | head, /etc/fstab, /boot/grub/menu.lst, and ls /boot provided below.

Anything look obvious?

Thanks,

Barry

----------------------------------------
bk | head
[rountree@dom0 xeno-unstable.bk]$ bk changes | head
ChangeSet@1.1143, 2004-07-28 16:35:54+01:00, smh22@tempest.cl.cam.ac.uk
  don't use common slab/page allocators for ia64 (it uses 2.6 stuff in arch 
directory)


----------------------------------------
cat /etc/fstab
/dev/sda5 / xfs defaults 1 1
none /dev/pts devpts mode=0620 0 0
#/dev/hdc /mnt/cdrom auto 
umask=0,user,iocharset=iso8859-1,codepage=850,noauto,ro,exec 0 0
#none /mnt/floppy supermount 
dev=/dev/fd0,fs=ext2:vfat,--,umask=0,iocharset=iso8859-1,sync,codepage=850 0 
0
none /proc proc defaults 0 0
/dev/sda1 swap swap defaults 0 0


----------------------------------------
cat /boot/grub/menu.lst
timeout 10
color black/cyan yellow/cyan
default 0

title Xen
kernel (hd0,4)/boot/xen.gz dom0_mem=131072 com1=115200 noht
module (hd0,4)/boot/vmlinuz-2.4.26-xen0 root=/dev/sda5 ro

title linux-smp
kernel (hd0,4)/boot/vmlinuz-smp root=/dev/sda5 devfs=mount acpi=ht 
resume=/dev/sda1 max_loop=128
initrd (hd0,4)/boot/initrd-smp.img


----------------------------------------
ls -l /boot
boot.0800
config
config-2.4.26-xen0
config-2.4.26-xenU
config-2.6.3-7mdk
config-2.6.3-7mdksmp
diag1.img
diag2.img
grub
initrd-2.6.3-7mdk.img
initrd-2.6.3-7mdksmp.img
initrd.img
initrd-smp.img
kernel.h
kernel.h-2.6.3-7mdk
kernel.h-2.6.3-7mdksmp
map
message
message-graphic
message-text
System.map
System.map-2.4.26-xen0
System.map-2.4.26-xenU
System.map-2.6.3-7mdk
System.map-2.6.3-7mdksmp
us.klt
vmlinux-syms-2.4.26-xen0
vmlinux-syms-2.4.26-xenU
vmlinuz
vmlinuz-2.4.26-xen0
vmlinuz-2.4.26-xenU
vmlinuz-2.6.3-7mdk
vmlinuz-2.6.3-7mdksmp
vmlinuz-smp
xen.gz
xen-syms


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Re: dom0 won't boot

[Ian Pratt]

> I had what was checked in a few days ago working quite well, so I decided to 
> wipe the machine and try out two partitions (swap + /) and domains 1+ on 
> loopback.
> 
> Now, after xen finished booting, the machine reboots.
> 
> The only think that's really different is my swap partition is on /dev/sda1 
> and my root partition is on /dev/sda5.  But the grub menu looks ok as far as 
> I can tell...

I'd be very surprised if this was a Xen issue rather than a
configuration problem.

I suspect Xen boots fine, starts dom0, but then dom0 bails,
probably because it can't mount root or such like. 

If you boot xen with the 'noreboot' cmdline option you'll get a
chance to read why dom0 is exiting.

First, make sure your xen and vmlinuz-xen images are built from
the same repo version. 

Best,
Ian


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Re: dom0 won't boot

[Barry Rountree]

On Thursday 29 July 2004 05:26 pm, Ian Pratt wrote:

> > Now, after xen finished booting, the machine reboots.

> I'd be very surprised if this was a Xen issue rather than a
> configuration problem.

I agree -- but I'd run out of places to look.

Is booting to an xfs partition allowed?  Hmmm... based on what xen is 
reporting, it looks like it loaded the kernel ok...

>
> I suspect Xen boots fine, starts dom0, but then dom0 bails,
> probably because it can't mount root or such like.
>
> If you boot xen with the 'noreboot' cmdline option you'll get a
> chance to read why dom0 is exiting.

[Transcribed]
(XEN) *** LOADING DOMAIN 0 ***
(XEN) Xen-ELF header found: 
'GUEST_OS=linux,GUEST_VER=2.4,XEN_VER=1.3,VIRT_BASE=0xC0000000'
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Kernel image:  02800000->02b0b8fc
(XEN)  Initrd image:  00000000->00000000
(XEN)  Dom0 alloc.:  02c00000->0ac00000
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: c0100000->c0458988
(XEN)  Init. ramdisk:  c0459000->c0459000
(XEN)  Phys-Mach map:  c0459000->c0479000
(XEN)  Page tables:  c0479000->c047c000
(XEN)  Start Info:  c047c000->c047d000
(XEN)  Boot stack:  c047d000->c047e000
(XEN)  TOTAL:  c00000000->c0800000
(XEN)  ENTRY ADDRESS:  c0100000
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to swith input to 
Xen).
[long pause.]
(XEN) Domain 0 shutdown: rebooting machine!
(XEN) Reboot disabled on cmdline: require manual reset

Can I assume from the above that it had located the kernel and loaded it?

>
> First, make sure your xen and vmlinuz-xen images are built from
> the same repo version.

This was a fresh bk clone on a new install -- what do you mean by "repo"?

>
> Best,
> Ian

Thanks

Barry

>
>
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Re: dom0 won't boot

[Steven Hand]

>[Transcribed]
>(XEN) *** LOADING DOMAIN 0 ***
>(XEN) Xen-ELF header found: 
>'GUEST_OS=linux,GUEST_VER=2.4,XEN_VER=1.3,VIRT_BASE=0xC0000000'
>(XEN) PHYSICAL MEMORY ARRANGEMENT:
>(XEN)  Kernel image:  02800000->02b0b8fc
>(XEN)  Initrd image:  00000000->00000000
>(XEN)  Dom0 alloc.:  02c00000->0ac00000
>(XEN) VIRTUAL MEMORY ARRANGEMENT:
>(XEN)  Loaded kernel: c0100000->c0458988
>(XEN)  Init. ramdisk:  c0459000->c0459000
>(XEN)  Phys-Mach map:  c0459000->c0479000
>(XEN)  Page tables:  c0479000->c047c000
>(XEN)  Start Info:  c047c000->c047d000
>(XEN)  Boot stack:  c047d000->c047e000
>(XEN)  TOTAL:  c00000000->c0800000
>(XEN)  ENTRY ADDRESS:  c0100000
>(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to swith input to 
>Xen).
>[long pause.]
>(XEN) Domain 0 shutdown: rebooting machine!
>(XEN) Reboot disabled on cmdline: require manual reset
>
>Can I assume from the above that it had located the kernel and loaded it?

What's your [xen]linux command line? You're not getting any start of 
day messages from dom0 which may mean that the console is set up incorrectly.
The less likely alternative is that something is going wrong (and taking a 
long time to do so) before the first message that should be output from
dom0... 

>> First, make sure your xen and vmlinuz-xen images are built from
>> the same repo version.
>
>This was a fresh bk clone on a new install -- what do you mean by "repo"?

"repo" is short for the bk repository which you're using; if you're using
a fresh clone you're probably up to date. The above comment was just 
stressing that it's important that the xen and xenlinux images are in 
sync (built from the same version), particularly with unstable.

cheers,

S.



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Re: dom0 won't boot

[Barry Rountree]

On Thursday 29 July 2004 06:05 pm, Steven Hand wrote:
> >Can I assume from the above that it had located the kernel and loaded it?
>
> What's your [xen]linux command line? 

I'm using

title Xen
kernel (hd0,4)/boot/xen.gz dom0_mem=131072 com1=115200 noht noreboot
module (hd0,4)/boot/vmlinuz-2.4.26-xen0 root=/dev/sda5 ro

and 

title linux-smp
kernel (hd0,4)/boot/vmlinuz-smp root=/dev/sda5 devfs=mount acpi=ht 
resume=/dev/sda1 max_loop=128
initrd (hd0,4)/boot/initrd-smp.img

The Xen command line is exactly what was working two days ago, except that 
(hd0,4) was (hd0,0) and /dev/sda5 was /dev/sda1.  (This was cut & pasted from 
my notes, so the chance of a typo in, say, com1 is reduced -- not eliminated, 
of course.  At this point I'm looking for 1/l O/0 sillies that could have 
crept in, but haven't found anything yet.)

the linux-smp works fine, of course.

> You're not getting any start of 
> day messages from dom0 which may mean that the console is set up
> incorrectly. The less likely alternative is that something is going wrong
> (and taking a long time to do so) before the first message that should be
> output from dom0...
>
> >> First, make sure your xen and vmlinuz-xen images are built from
> >> the same repo version.
> >
> >This was a fresh bk clone on a new install -- what do you mean by "repo"?
>
> "repo" is short for the bk repository which you're using; if you're using
> a fresh clone you're probably up to date. The above comment was just
> stressing that it's important that the xen and xenlinux images are in
> sync (built from the same version), particularly with unstable.
>
Good to know.

> cheers,
>
> S.

Thanks,

Barry



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Re: dom0 won't boot

[Ian Pratt]

> On Thursday 29 July 2004 05:26 pm, Ian Pratt wrote:
> 
> > > Now, after xen finished booting, the machine reboots.
> 
> > I'd be very surprised if this was a Xen issue rather than a
> > configuration problem.
> 
> I agree -- but I'd run out of places to look.

You're using a serial console, right?  Add "console=ttyS0" to the
linux command line:

title Xen
kernel (hd0,4)/boot/xen.gz dom0_mem=131072 com1=115200,8n1 noht
module (hd0,4)/boot/vmlinuz-2.4.26-xen0 root=/dev/sda5 ro console=ttyS0

> Is booting to an xfs partition allowed?  

Sure, providing XFS is configured in the kernel.

> Hmmm... based on what xen is 
> reporting, it looks like it loaded the kernel ok...

Yep, it's loading fine, but then dom0 is exits in an orderly fashion. 


Ian


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Re: dom0 won't boot

[Barry Rountree]

On Thursday 29 July 2004 06:09 pm, Ian Pratt wrote:
> > On Thursday 29 July 2004 05:26 pm, Ian Pratt wrote:
> > > > Now, after xen finished booting, the machine reboots.
> > >
> > > I'd be very surprised if this was a Xen issue rather than a
> > > configuration problem.
> >
> > I agree -- but I'd run out of places to look.
>
> You're using a serial console, right?  
Well, I will be now...  ;-P

> Add "console=ttyS0" to the 
> linux command line:

Ok, let me get this set up and I'll post what happens.

Barry


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Re: dom0 won't boot

[Barry Rountree]

On Thursday 29 July 2004 06:30 pm, Barry Rountree wrote:

> > Add "console=ttyS0" to the
> > linux command line:
>
> Ok, let me get this set up and I'll post what happens.

Here's the output from the serial console:

Restarting system.
[rebooting from linux-smp into xen]
kernel (hd0,4)/boot/xen.gz dom0_mem=131072 com1=115200 noht noreboot
   [Multiboot-elf, <0x100000:0x40c4c:0x344f4>, shtab=0x176078, entry=0x100000]
module (hd0,4)/boot/vmlinuz-2.4.26-xen0 root=/dev/sda5 ro console=ttyS0
   [Multiboot-module @ 0x177000, 0x30b8fc bytes]

That's it.

To sum up, things that have changed from the last time this worked:

(Slightly) newer code.
Using XFS instead of ext2.
Only two partitions (1GB swap and 15GB) instead of several smaller ones.
I was in a bit more of a hurry...

Let me know if there's anything else useful I can try.  Otherwise, I'll wipe 
the drive and start over in the morning.

Barry




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RE: dom0 won't boot

[James Harper]

[-- Attachment #1: Type: text/plain, Size: 1766 bytes --]

My machine rebooted under similar circumstances, although I might have got something from dom0, but I put noacpi in the xen boot line in grub and it fixed it right up.

james



From: Barry Rountree
Sent: Fri 30/07/2004 10:16 AM
To: xen-devel@lists.sourceforge.net
Subject: Re: [Xen-devel] dom0 won't boot


On Thursday 29 July 2004 06:30 pm, Barry Rountree wrote:

> > Add "console=ttyS0" to the
> > linux command line:
>
> Ok, let me get this set up and I'll post what happens.

Here's the output from the serial console:

Restarting system.
[rebooting from linux-smp into xen]
kernel (hd0,4)/boot/xen.gz dom0_mem=131072 com1=115200 noht noreboot
   [Multiboot-elf, <0x100000:0x40c4c:0x344f4>, shtab=0x176078, entry=0x100000]
module (hd0,4)/boot/vmlinuz-2.4.26-xen0 root=/dev/sda5 ro console=ttyS0
   [Multiboot-module @ 0x177000, 0x30b8fc bytes]

That's it.

To sum up, things that have changed from the last time this worked:

(Slightly) newer code.
Using XFS instead of ext2.
Only two partitions (1GB swap and 15GB) instead of several smaller ones.
I was in a bit more of a hurry...

Let me know if there's anything else useful I can try.  Otherwise, I'll wipe 
the drive and start over in the morning.

Barry




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Re: dom0 won't boot

[Barry Rountree]

On Thursday 29 July 2004 08:25 pm, James Harper wrote:
> My machine rebooted under similar circumstances, although I might have got
> something from dom0, but I put noacpi in the xen boot line in grub and it
> fixed it right up.
>
Hmmm.... just tried that, didn't work.  Good idea though.

Barry


> james


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Re: dom0 won't boot

[Ian Pratt]

> On Thursday 29 July 2004 06:30 pm, Barry Rountree wrote:
> 
> > > Add "console=ttyS0" to the
> > > linux command line:
> >
> > Ok, let me get this set up and I'll post what happens.
> 
> Here's the output from the serial console:
> 
> Restarting system.
> [rebooting from linux-smp into xen]
> kernel (hd0,4)/boot/xen.gz dom0_mem=131072 com1=115200 noht noreboot
>    [Multiboot-elf, <0x100000:0x40c4c:0x344f4>, shtab=0x176078, entry=0x100000]
> module (hd0,4)/boot/vmlinuz-2.4.26-xen0 root=/dev/sda5 ro console=ttyS0
>    [Multiboot-module @ 0x177000, 0x30b8fc bytes]

All of that output is from grub, you're not seeing anything from
Xen.

Try "com1=115200,8n1" and make sure that you've got the baudrate
at the other end set correctly (I thought grub defaulted to 9600?)

Ian


> That's it.
> 
> To sum up, things that have changed from the last time this worked:
> 
> (Slightly) newer code.
> Using XFS instead of ext2.
> Only two partitions (1GB swap and 15GB) instead of several smaller ones.
> I was in a bit more of a hurry...
> 
> Let me know if there's anything else useful I can try.  Otherwise, I'll wipe 
> the drive and start over in the morning.
> 
> Barry
> 
> 
> 
> 
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Re: dom0 won't boot

[Barry Rountree]

On Thursday 29 July 2004 08:29 pm, Ian Pratt wrote:

> All of that output is from grub, you're not seeing anything from
> Xen.
>
> Try "com1=115200,8n1" and make sure that you've got the baudrate
> at the other end set correctly (I thought grub defaulted to 9600?)

It's set correctly -- I had never done this before, so there was a bit of a 
learning curve.  I practiced on the smp kernel that I usually boot into and 
when I was able to capture everything in minicom there I switched over to 
xen.  If I had gotten no output at all, it would have been suspicious.  
However, I did get output, no characters were garbled, no sentences cut in 
half, etc.

For whatever it's worth, here's the entry in grub:

title Xen-Serial
serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
terminal serial
kernel (hd0,4)/boot/xen.gz dom0_mem=131072 com1=115200 noht noreboot
module (hd0,4)/boot/vmlinuz-2.4.26-xen0 root=/dev/sda5 ro console=ttyS0

But still, a good point.

Barry
>
> Ian


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Re: dom0 won't boot

[Ian Pratt]

> On Thursday 29 July 2004 08:29 pm, Ian Pratt wrote:
> 
> > All of that output is from grub, you're not seeing anything from
> > Xen.
> >
> > Try "com1=115200,8n1" and make sure that you've got the baudrate
> > at the other end set correctly (I thought grub defaulted to 9600?)
> 
> It's set correctly -- I had never done this before, so there was a bit of a 
> learning curve.  I practiced on the smp kernel that I usually boot into and 
> when I was able to capture everything in minicom there I switched over to 
> xen.  If I had gotten no output at all, it would have been suspicious.  
> However, I did get output, no characters were garbled, no sentences cut in 
> half, etc.
> 
> For whatever it's worth, here's the entry in grub:
> 
> title Xen-Serial
> serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
> terminal serial
> kernel (hd0,4)/boot/xen.gz dom0_mem=131072 com1=115200 noht noreboot
> module (hd0,4)/boot/vmlinuz-2.4.26-xen0 root=/dev/sda5 ro console=ttyS0

You're setting the serial baud rate to 9600 in grub, then 115200
in Xen? That doesn't sound sane. The baudrate mismatch is so
gross that you probably wouldn't even see garbage.

Try com1=9600,8n1   (I can't remember whether the ',8n1' is
mandatory but let's assume it is...)


Ian




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Re: dom0 won't boot -- Fixed

[Barry Rountree]

On Friday 30 July 2004 03:27 am, Ian Pratt wrote:
> > On Thursday 29 July 2004 08:29 pm, Ian Pratt wrote:
> > > All of that output is from grub, you're not seeing anything from
> > > Xen.
> > >
> > > Try "com1=115200,8n1" and make sure that you've got the baudrate
> > > at the other end set correctly (I thought grub defaulted to 9600?)
> >
> > It's set correctly -- 

[snip an embarrassing moment of hubris] 

> > title Xen-Serial
> > serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
> > terminal serial
> > kernel (hd0,4)/boot/xen.gz dom0_mem=131072 com1=115200 noht noreboot
> > module (hd0,4)/boot/vmlinuz-2.4.26-xen0 root=/dev/sda5 ro console=ttyS0
>
> You're setting the serial baud rate to 9600 in grub, then 115200
> in Xen? That doesn't sound sane. The baudrate mismatch is so
> gross that you probably wouldn't even see garbage.
>
DOH!  Yup, absolutely right.

> Try com1=9600,8n1   (I ca't remember whether the ',8n1' is
> mandatory but let's assume it is...)

The interesting bit:

FAT: bogus logical sector size 0
UMSDOS: msdos_read_super failed, mount aborted.
FAT: bogus logical sector size 0
FAT: bogus logical sector size 0
Kernel panic: VFS: Unable to mount root fs on 08:05
 <0>Rebooting in 1 seconds..(XEN) Domain 0 shutdown: rebooting machine!
(XEN) Reboot disabled on cmdline: require manual reset

The damning line from the kernel .config file:

# CONFIG_XFS_FS is not set

while /etc/fstab wants

/dev/sda5 / xfs defaults 1 1

Oooops....<blush>

Thanks to everybody who helped; I'll see if I can come up with a more 
interesting problem next time...

Barry

> Ian


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Re: dom0 won't boot

[Mark Williamson]

Your Grub config shows you're passing: com1=115200 to Xen.  I suspect Xen 
would reject that format and not produce any serial output.  You really do 
need the full: com1=115200,8n1 or it might not work.

Unfortunately, having the serial console working in Linux is not quite enough 
because Xen has control of the serial port and XenLinux has to go through Xen. 
 You should at least be seeing something of Xen output on the serial line even 
if Linux isn't booting.

Thanks for your patience, you should be up and running again soon.

HTH,
Mark



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