[uml-devel] 2.6.18 UML machine on FC6 host

[uml-devel] 2.6.18 UML machine on FC6 host

[Jacques-Charles Lafoucriere]

Hi,

I am trying to build and run a UML 2.6.18 machine on a FC6 host. 
(2.6.18-1.2798)
I have tried many patches from the list and was not able to be successful
(hang after VFS: Mounted root (ext3 filesystem) readonly.)
Does the host need a special patch to run recent UML kernel or is it 
only an issue in the UML machine ?

JCL

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Re: [uml-devel] 2.6.18 UML machine on FC6 host

[Jeff Dike]

On Mon, Mar 19, 2007 at 10:00:49AM +0100, Jacques-Charles Lafoucriere wrote:
> I am trying to build and run a UML 2.6.18 machine on a FC6 host. 
> (2.6.18-1.2798)

Why are you insisting on a 2.6.18 UML?

> I have tried many patches from the list and was not able to be successful
> (hang after VFS: Mounted root (ext3 filesystem) readonly.)

Try 2.6.21-rc4 or this patch:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff_plain;h=14251809b1921b1216568700f1be2f91a1cbb5c7

> Does the host need a special patch to run recent UML kernel or is it 
> only an issue in the UML machine ?

It was a bug in UML's handing of newer host VDSOs.

				Jeff

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Re: [uml-devel] 2.6.18 UML machine on FC6 host

[Jacques-Charles Lafoucriere]

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Jeff Dike wrote:
> On Mon, Mar 19, 2007 at 10:00:49AM +0100, Jacques-Charles Lafoucriere wrote:
>   
>> I am trying to build and run a UML 2.6.18 machine on a FC6 host. 
>> (2.6.18-1.2798)
>>     
>
> Why are you insisting on a 2.6.18 UML?
>   
I work on some  kernel product that will be available on RHEL5 which 
uses 2.6.18
And RHEL5 kernel does not work in the UML target, so a vanilla 2.6.18 is 
the closest kernel
I want to avoid a 2.6.20 or later port of the product

>   
>> I have tried many patches from the list and was not able to be successful
>> (hang after VFS: Mounted root (ext3 filesystem) readonly.)
>>     
>
> Try 2.6.21-rc4 or this patch:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff_plain;h=14251809b1921b1216568700f1be2f91a1cbb5c7
>   
Ok I will try

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Re: [uml-devel] 2.6.18 UML machine on FC6 host

[Jacques-Charles Lafoucriere]

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Hi,

I applied the patch to a 2.6.20 kernel and tried the 2.6.21-rc4 and 
still have the issue

The UML machine is in an infinite loop

ptrace(PTRACE_GETREGS, 16641, 0, 0x9dc5974) = 0
ptrace(PTRACE_GETFPXREGS, 16641, 0, 0x9dc5a24) = 0
ptrace(PTRACE_CONT, 16641, 0, SIGSEGV)  = 0
waitpid(16641, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGUSR1}], WSTOPPED) = 
16641
--- SIGCHLD (Child exited) @ 0 (0) ---
ptrace(PTRACE_SETREGS, 16641, 0, 0x9dc5974) = 0
ptrace(PTRACE_SETFPXREGS, 16641, 0, 0x9dc5a24) = 0
ptrace(0x1f /* PTRACE_??? */, 16641, 0, 0) = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
waitpid(16641, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGSEGV}], WSTOPPED) = 
16641
ptrace(PTRACE_GETREGS, 16641, 0, 0x9dc5974) = 0
ptrace(PTRACE_GETFPXREGS, 16641, 0, 0x9dc5a24) = 0
ptrace(PTRACE_CONT, 16641, 0, SIGSEGV)  = 0
--- SIGCHLD (Child exited) @ 0 (0) ---

Do I have to change things on my host machine ? (I use 2.6.18-1.2798 
with no skas3 patch)


Jeff Dike wrote:
> On Mon, Mar 19, 2007 at 10:00:49AM +0100, Jacques-Charles Lafoucriere wrote:
>   
>> I am trying to build and run a UML 2.6.18 machine on a FC6 host. 
>> (2.6.18-1.2798)
>>     
>
> Why are you insisting on a 2.6.18 UML?
>
>   
>> I have tried many patches from the list and was not able to be successful
>> (hang after VFS: Mounted root (ext3 filesystem) readonly.)
>>     
>
> Try 2.6.21-rc4 or this patch:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff_plain;h=14251809b1921b1216568700f1be2f91a1cbb5c7
>
>   
>> Does the host need a special patch to run recent UML kernel or is it 
>> only an issue in the UML machine ?
>>     
>
> It was a bug in UML's handing of newer host VDSOs.
>
> 				Jeff
>
>   

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Re: [uml-devel] 2.6.18 UML machine on FC6 host

[Jeff Dike]

On Tue, Mar 20, 2007 at 09:12:44AM +0100, Jacques-Charles Lafoucriere wrote:
> I applied the patch to a 2.6.20 kernel and tried the 2.6.21-rc4 and 
> still have the issue
> 
> The UML machine is in an infinite loop
> 
> Do I have to change things on my host machine ? (I use 2.6.18-1.2798 
> with no skas3 patch)

No.

What is the host?

Can you send me the -rc4 binary so I can see if I get the same
behavior here?  If it works for me, is it possible for me to debug on
your host?

				Jeff

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Re: [uml-devel] 2.6.18 UML machine on FC6 host

[Jacques-Charles Lafoucriere]

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Jeff Dike wrote:
> On Tue, Mar 20, 2007 at 09:12:44AM +0100, Jacques-Charles Lafoucriere wrote:
>   
>> I applied the patch to a 2.6.20 kernel and tried the 2.6.21-rc4 and 
>> still have the issue
>>
>> The UML machine is in an infinite loop
>>
>> Do I have to change things on my host machine ? (I use 2.6.18-1.2798 
>> with no skas3 patch)
>>     
>
> No.
>
> What is the host?
>   
Dell Lattitude D820, Linux IA32
> Can you send me the -rc4 binary so I can see if I get the same
> behavior here?  If it works for me, is it possible for me to debug on
> your host?
>
>   
I send you the kernel directly (too large for a list)
You cannot access the machine but I can send you traces.

JC


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Re: [uml-devel] 2.6.18 UML machine on FC6 host

[Andrew Sinclair]

Hi there,

I've been trying to run UML on FC6 (kernel 2.6.20-1.2933.fc6) and appear
to have encountered the same issue as described in the following
threads:

http://www.mail-archive.com/user-mode-linux-devel@lists.sourceforge.net/
msg04571.html

http://www.mail-archive.com/user-mode-linux-user@lists.sourceforge.net/m
sg04479.html

Has there been any further resolution of trying to get UML to run on
FC6? The system hangs when I get to "VFS: Mounted root (ext3 filesystem)
readonly."

I have applied patches described in both threads to kernel 2.6.19 and
rebuilt and still encounter issues. I have also tried pre-built kernels
2.6.21.1 downloaded via http://uml.nagafix.co.uk/, and 2.6.13.4-bs5,
2.6.16.9-bs2, 2.6.18.1-bb2 from
http://www.user-mode-linux.org/~blaisorblade/binaries/

I have attempted loads of prebuilt rootfs Busybox 1.5.0, 1.1.0, Debian
4.0 from http://uml.nagafix.co.uk/, and also a hostfs rootfs with most
of the kernels. 

I am able to get pre-built kernel and rootfs operating on Mepis (using
kernel 2.6.18.1-bb2 and rootfs busybox-1.5.0) or Red Hat 7.3 (using
kernel 2.4.32-bs3 and rootfs busybox-1.1.1)


My command line has been something like
./linux rootfstype=hostfs init=/bin/sh

or 

./linux ubd0=./rootfs init=/bin/sh

I have also various other switches described in
http://uml.nagafix.co.uk/ and http://www.landley.net/code/UML.html

Can anyone help? 

Kind Regards

Andrew Sinclair

> Antoine Martin wrote:
>>> Downgrading to skas-v8.2 makes things work fine again.
>> Ah, did you get around to generate a v8.2 patch for 2.6.19?
>
> http://www.theshore.net/~caker/uml/patches/skas-2.6.19.1-v8.2.patch
>
> So far so good.  I've got a few hosts running it now, but only a few 
> UMLs on each one.  Still too early to tell if we'll run into the hang 
> with certain filesystems...
>
>>> I think the key to reproducing this is a skas-v9 host.  It doesn't 
>>> happen for me on every file system, which is somewhat interesting.
>> Yep, it seems like a nptl/glibc issue (just a guess though)
>
> BTW, stay away from 2.6.19.1 if you use ebtables -- there's a BUG. 
> 2.6.19 works, and the above patch will apply just fine.
>
> -Chris



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Re: [uml-devel] 2.6.18 UML machine on FC6 host

[Antoine Martin]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Andrew Sinclair wrote:
> Hi there,
> 
> I've been trying to run UML on FC6 (kernel 2.6.20-1.2933.fc6) and appear
> to have encountered the same issue as described in the following
> threads:
You need to upgrade your host kernel.
Try 2.6.21 or >= 2.6.20.8

Antoine


> 
> http://www.mail-archive.com/user-mode-linux-devel@lists.sourceforge.net/
> msg04571.html
> 
> http://www.mail-archive.com/user-mode-linux-user@lists.sourceforge.net/m
> sg04479.html
> 
> Has there been any further resolution of trying to get UML to run on
> FC6? The system hangs when I get to "VFS: Mounted root (ext3 filesystem)
> readonly."
> 
> I have applied patches described in both threads to kernel 2.6.19 and
> rebuilt and still encounter issues. I have also tried pre-built kernels
> 2.6.21.1 downloaded via http://uml.nagafix.co.uk/, and 2.6.13.4-bs5,
> 2.6.16.9-bs2, 2.6.18.1-bb2 from
> http://www.user-mode-linux.org/~blaisorblade/binaries/
> 
> I have attempted loads of prebuilt rootfs Busybox 1.5.0, 1.1.0, Debian
> 4.0 from http://uml.nagafix.co.uk/, and also a hostfs rootfs with most
> of the kernels. 
> 
> I am able to get pre-built kernel and rootfs operating on Mepis (using
> kernel 2.6.18.1-bb2 and rootfs busybox-1.5.0) or Red Hat 7.3 (using
> kernel 2.4.32-bs3 and rootfs busybox-1.1.1)
> 
> 
> My command line has been something like
> /linux rootfstype=hostfs init=/bin/sh
> 
> or 
> 
> /linux ubd0=./rootfs init=/bin/sh
> 
> I have also various other switches described in
> http://uml.nagafix.co.uk/ and http://www.landley.net/code/UML.html
> 
> Can anyone help? 
> 
> Kind Regards
> 
> Andrew Sinclair
> 
>> Antoine Martin wrote:
>>>> Downgrading to skas-v8.2 makes things work fine again.
>>> Ah, did you get around to generate a v8.2 patch for 2.6.19?
>> http://www.theshore.net/~caker/uml/patches/skas-2.6.19.1-v8.2.patch
>>
>> So far so good.  I've got a few hosts running it now, but only a few 
>> UMLs on each one.  Still too early to tell if we'll run into the hang 
>> with certain filesystems...
>>
>>>> I think the key to reproducing this is a skas-v9 host.  It doesn't 
>>>> happen for me on every file system, which is somewhat interesting.
>>> Yep, it seems like a nptl/glibc issue (just a guess though)
>> BTW, stay away from 2.6.19.1 if you use ebtables -- there's a BUG. 
>> 2.6.19 works, and the above patch will apply just fine.
>>
>> -Chris
> 
> 
> 

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Re: [uml-devel] 2.6.18 UML machine on FC6 host

[Ryan Angilly]

Do you know why exactly the kernel needs to be upgraded?  Just curious.

Antoine Martin <antoine <at> nagafix.co.uk> writes:
> > I've been trying to run UML on FC6 (kernel 2.6.20-1.2933.fc6) and appear
> > to have encountered the same issue as described in the following
> > threads:
> You need to upgrade your host kernel.
> Try 2.6.21 or >= 2.6.20.8
> 
> Antoine


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Re: [uml-devel] 2.6.18 UML machine on FC6 host

[Antoine Martin]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Ryan Angilly wrote:
> Do you know why exactly the kernel needs to be upgraded?  Just curious.
Some bugs that were fixed in the host code.
circa 2.6.20.2

> 
> Antoine Martin <antoine <at> nagafix.co.uk> writes:
>>> I've been trying to run UML on FC6 (kernel 2.6.20-1.2933.fc6) and appear
>>> to have encountered the same issue as described in the following
>>> threads:
>> You need to upgrade your host kernel.
>> Try 2.6.21 or >= 2.6.20.8
>>
>> Antoine
> 
> 
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Re: [uml-devel] 2.6.18 UML machine on FC6 host

[Andrew Sinclair]

Thanks Antoine. Upgrading kernel to 2.6.21 has resolved the problem.

Kind Regards

Andrew Sinclair

-----Original Message-----
From: user-mode-linux-devel-bounces@lists.sourceforge.net
[mailto:user-mode-linux-devel-bounces@lists.sourceforge.net] On Behalf
Of Antoine Martin
Sent: Wednesday, 23 May 2007 10:59 AM
To: Ryan Angilly
Cc: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] 2.6.18 UML machine on FC6 host

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Ryan Angilly wrote:
> Do you know why exactly the kernel needs to be upgraded?  Just
curious.
Some bugs that were fixed in the host code.
circa 2.6.20.2

> 
> Antoine Martin <antoine <at> nagafix.co.uk> writes:
>>> I've been trying to run UML on FC6 (kernel 2.6.20-1.2933.fc6) and 
>>> appear to have encountered the same issue as described in the 
>>> following
>>> threads:
>> You need to upgrade your host kernel.
>> Try 2.6.21 or >= 2.6.20.8
>>
>> Antoine
> 
> 
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