User Mode Linux (UML) User List. UML is a Linux Kernel that runs in user space

Antoine Martin | 3 Nov 2008 23:22

[uml-user] [Fwd: pulling FC5 image]

FWD: I've had no reply so I've pulled the images.

From: Antoine Martin <antoine <at> nagafix.co.uk>
Subject: pulling FC5 image
Date: 2008-10-28 19:45:46 GMT


Hi Jeff,

I will be removing the FC5 disk image which is linked from the home page.
It is taking a fair chunk out of my bandwidth allowance and I never got
as much as a credit or a thank you.
Many of the downloads that I see come from Windows machines running IE,
probably some useless people who think they will be able to run Linux on
Windows via uml.
You can copy it somewhere else if you like.

Cheers
Antoine

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Jeff Dike | 4 Nov 2008 01:59

Re: [uml-user] [Fwd: pulling FC5 image]

On Mon, Nov 03, 2008 at 10:22:04PM +0000, Antoine Martin wrote:
> FWD: I've had no reply so I've pulled the images.

I had a mail server disaster which sort of crimped my style.

However, I did pull the images from nagafix and will host them on SF
as soon as it stops giving me a connection refused when I try to
update the site.

				Jeff

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Gerson Rodríguez de los Santos López | 6 Nov 2008 12:20

Re: [uml-user] 64 bit Linux issue

Hi everyone.

I tried two solutions:

1) Compiling a new guest kernel. I got several errors during compilations with some kernel sources. I managed to compile successfully some sources, but the images didn't work at the end. Not even in a 32 bit system. I guess I did something horribly wrong xD.

2) Installing a 64 bit Ubuntu 8.10 with the latest version of the kernel. It uses a 2.6.27-7 kernel. It worked fine since the very beginning. I used exactly the same guest kernel image and filesystem, that is, I changed nothing but the host kernel. So, despite the guest kernel being a bit old it seems to work fine.

Thanks so much for your help. I hope this helps other people with the same problem.

Best regards.

Gerson.

Gordon Russell wrote:

I would still get you to update the host kernels to something newer. That way you are sure it is not a kernel version think. 64 bit support is much better as the guest kernels get newer. Gordon.
Case 1) Host: 32 bits (2.6.24). Guest, UML Kernel: 32 bits. (linux-um-2.6.18.1-bb2-xt-4m) Case 2) Host: 64 bits (2.6.24, 2.6.16). Guest: 32 bits. (the same linux-um-2.6.18.1-bb2-xt-4m) In both cases the host kernel is not too old (at least in the case of
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Gerson Rodríguez de los Santos López | 6 Nov 2008 12:09

Re: [uml-user] 64 bit Linux issue

Hi everyone.

I tried two solutions:

1) Compiling a new guest kernel. I got several errors during compilations with some kernel sources. I managed to compile successfully some sources, but the images didn't work at the end. Not even in a 32 bit system. I guess I did something horribly wrong xD.

2) Installing a 64 bit Ubuntu 8.10 with the latest version of the kernel. It uses a 2.6.27-7 kernel. It worked fine since the very beginning. I used exactly the same guest kernel image and filesystem, that is, I changed nothing but the host kernel. So, despite the guest kernel being a bit old it seems to work fine.

Thanks so much for your help. I hope this helps other people with the same problem.

Best regards.

Gerson.

Gordon Russell wrote:

I would still get you to update the host kernels to something newer. That way you are sure it is not a kernel version think. 64 bit support is much better as the guest kernels get newer. Gordon.
Case 1) Host: 32 bits (2.6.24). Guest, UML Kernel: 32 bits. (linux-um-2.6.18.1-bb2-xt-4m) Case 2) Host: 64 bits (2.6.24, 2.6.16). Guest: 32 bits. (the same linux-um-2.6.18.1-bb2-xt-4m) In both cases the host kernel is not too old (at least in the case of
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Thomas Stewart | 10 Nov 2008 23:10

[uml-user] panics in mm/rmap.c:page_remove_rmap()

Hi,

I rent a small UML virtual machine and I'm getting panics in mm/rmap.c.
It's running 2.6.23.1 and the panics happen semi regularly, I have not
had an uptime greater than 10 days since July and generally get a panic
most days. Unfortunately I don't have access to recompile the kernel
directly or access to the config. However I do have an actual panic
output[1].

The vm only has 150M of memory and twice that in swap. It runs a few
websites, does email and a few other bits and pieces. 

Generally the load is less than one and most services are tuned to use
as little memory as possible. However I assume the host box is fairly
loaded. The load during the panic was up in the twenties and it seems
that the panics coincide with high load and or high io.

I have run out of ideas and the constant reboots are getting annoying.
All I have to go on is the panic. Anyone got any ideas whats going on?

Please CC me as I'm off the list, thanks 

Regards
--
Tom

[1]
Eeek! page_mapcount(page) went negative! (-1)
  page pfn = ad
  page->flags = 404
  page->count = 1
  page->mapping = 00000000
  vma->vm_ops = _stext+0xf7fb7f4c/0xc
BUG: failure at mm/rmap.c:630/page_remove_rmap()!
Kernel panic - not syncing: BUG!

EIP: 0073:[<40030024>] CPU: 0 Not tainted ESP: 007b:bf4c1a40 EFLAGS: 00210202
    Not tainted
EAX: 408c0008 EBX: 400c3e60 ECX: 40900020 EDX: 00002aec
ESI: 4380aba8 EDI: 00000000 EBP: bf4c1a58 DS: 007b ES: 007b
0ce8bcb8:  [<08094e81>] notifier_call_chain+0x41/0x80
0ce8bcd8:  [<08094f9e>] atomic_notifier_call_chain+0x2e/0x40
0ce8bcf0:  [<08085ea6>] panic+0x76/0x110
0ce8bd10:  [<080bf31c>] page_remove_rmap+0x18c/0x1a0
0ce8bd2c:  [<080b7474>] zap_pte_range+0x174/0x230
0ce8bd5c:  [<080b75d4>] unmap_page_range+0xa4/0x140
0ce8bd94:  [<080b77a1>] unmap_vmas+0x131/0x200
0ce8bdd8:  [<080bd0f8>] exit_mmap+0x68/0x110
0ce8be08:  [<08083c64>] mmput+0x24/0x70
0ce8be14:  [<08088442>] exit_mm+0x72/0x110
0ce8be38:  [<08088d06>] do_exit+0x116/0x450
0ce8be44:  [<0809132c>] recalc_sigpending+0x1c/0x30
0ce8be64:  [<080890b7>] do_group_exit+0x47/0xc0
0ce8be70:  [<080f00c1>] do_splice+0x161/0x200
0ce8be88:  [<08093868>] get_signal_to_deliver+0x218/0x2a0
0ce8beb0:  [<08066b46>] kern_do_signal+0x66/0x1b0
0ce8bee8:  [<0807fa04>] load_TLS+0x74/0x100
0ce8bf10:  [<0807d607>] arch_switch_to_skas+0x17/0x60
0ce8bf1c:  [<08069296>] switch_to_skas+0x56/0x90
0ce8bf30:  [<08065d1a>] _switch_to+0x6a/0xc0
0ce8bf54:  [<08477685>] schedule+0x165/0x2a0
0ce8bf78:  [<08066caf>] do_signal+0x1f/0x30
0ce8bf84:  [<08065d9a>] interrupt_end+0x2a/0x40
0ce8bf90:  [<0807b87d>] userspace+0x15d/0x260
0ce8bfe8:  [<080693e7>] fork_handler+0x77/0x90

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Nicolas Boullis | 12 Nov 2008 11:14

[uml-user] "do_syscall_stub: syscall 192 failed"

Hi,

I'm currently using Debian Etch's user-mode-linux package, based on
kernel 2.6.18.

Everything has been working fine for months. But I recently experienced
some crashes of memory-consuming applications. Those crashes go with an
error message by the (guest) kernel:

do_syscall_stub : ret = -12, offset = 2147479560, data = 1a0c5008
do_syscall_stub: syscall 192 failed, return value = 0xfffffff4, expected
return value = 0xe1b7000
    syscall parameters: 0xe1b7000 0x1000 0x7 0x11 0x4 0xe507
fix_range_common: failed, killing current process

Does anybody know how I should understand this message? Is there a way I
can fix the problem?

Regards,

Nicolas Boullis

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Jeff Dike | 12 Nov 2008 14:37

Re: [uml-user] "do_syscall_stub: syscall 192 failed"

On Wed, Nov 12, 2008 at 11:14:25AM +0100, Nicolas Boullis wrote:
> Does anybody know how I should understand this message? Is there a way I
> can fix the problem?

Try doubling or quadrupuling the host's /proc/sys/vm/max_map_count.

				Jeff

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Nicolas Boullis | 12 Nov 2008 15:48

Re: [uml-user] "do_syscall_stub: syscall 192 failed"

Hi,

Jeff Dike wrote:
> 
> Try doubling or quadrupuling the host's /proc/sys/vm/max_map_count.

Thanks a lot Jeff, it perfectly did the trick.

Just curious, is it a global or a per-process limit?

Thanks,

Nicolas

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lanas | 15 Nov 2008 00:02

[uml-user] Many eth interfaces on many UMLs

Hello all,

  I'm looking at having at least 15 UMLs with each UMLs using 4 eth
ports. The (primitive) way I'm using at the moment to launch a UML with
four ports is like this:

./linux ubda=testfs.1 eth1=tuntap,,,192.168.1.201 eth2=tuntap,,,192.168.1.202
eth3=tuntap,,,192.168.1.203 eth4=tuntap,,,192.168.1.204 eth5=tuntap,,,192.168.1.205

  Somehow this does not sound like a good idea if multiplied by 15, or
even by more.  60 tap devices does not seems to sound good.

  What would be the better approach at having this quantity of UMLs with
that many eth interfaces per UML ?  Each eth interface in each UML has
to be accessible from outside the host.

Thanks for any comments/suggestions/ideas !

Cheers.

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root | 15 Nov 2008 09:36

Re: [uml-user] Many eth interfaces on many UMLs


You could try the soft at http://clownix.net

Le vendredi 14 novembre 2008 à 18:02 -0500, lanas a écrit :
> Hello all,
> 
>   I'm looking at having at least 15 UMLs with each UMLs using 4 eth
> ports. The (primitive) way I'm using at the moment to launch a UML with
> four ports is like this:
> 
> ./linux ubda=testfs.1 eth1=tuntap,,,192.168.1.201 eth2=tuntap,,,192.168.1.202
eth3=tuntap,,,192.168.1.203 eth4=tuntap,,,192.168.1.204 eth5=tuntap,,,192.168.1.205
> 
>   Somehow this does not sound like a good idea if multiplied by 15, or
> even by more.  60 tap devices does not seems to sound good.
> 
>   What would be the better approach at having this quantity of UMLs with
> that many eth interfaces per UML ?  Each eth interface in each UML has
> to be accessible from outside the host.
> 
> Thanks for any comments/suggestions/ideas !
> 
> Cheers.
> 
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> Build the coolest Linux based applications with Moblin SDK & win great prizes
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> &#0;
> 

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