gmane.linux.uml.user

[uml-user] mv failed, file away

Toralf Förster — 2012-05-15T18:42:46

I've mounted within a UML (jhostname is: n22_uml) the host files system
onto /mnt/n22/.

Now the following appears :

n22_uml ~ # touch test
n22_uml ~ # ls -l test
-rw-r--r-- 1 root root 0 May 15 20:40 test
n22_uml ~ # mv test /mnt/n22/tmp
mv: failed to preserve ownership for ‘/mnt/n22/tmp/test’: Operation not
permitted
n22_uml ~ # ls -l test
ls: cannot access test: No such file or directory

I'd expect, that in this case the file isn't removed, or ?

Re: [uml-user] UML not shutting down due to "task killall5 blocked for more than 120 seconds"

Riccardo Murri — 2012-05-09T12:18:38

Hi Richard,

On Wed, May 9, 2012 at 12:06 PM, richard -rw- weinberger
<richard.weinberger< at >gmail.com> wrote:

We're trying 3.2.16 right now (also from devloop.org.uk); it might
take some time before we are able to confirm or disprove, since the
bug does not occur deterministically but only on a certain percentage
of the runs.

Thanks,
Riccardo

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Re: [uml-user] UML not shutting down due to "task killall5 blocked for more than 120 seconds"

richard -rw- weinberger — 2012-05-09T10:06:48

On Wed, May 9, 2012 at 11:35 AM, Riccardo Murri
<riccardo.murri< at >gmail.com> wrote:

Can you please try a recent kernel?
Maybe you need this commit:
3a3679078aed2c451ebc32836bbd3b8219a65e01 (um: Use RWSEM_GENERIC_SPINLOCK on x86)

[uml-user] UML not shutting down due to "task killall5 blocked formore than 120 seconds"

Riccardo Murri — 2012-05-09T09:35:27

Hello,

we're having issues with a UML machine that refuses to shut down: the
halt sequence commences and then we get the following kernel error
message and backtrace:

    Asking all remaining processes to terminate...
    INFO: task killall5:5269 blocked for more than 120 seconds.
    [ 1080.320000] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
    [ 1080.320000] killall5        D 00000000405070c3     0  5269
5266 0x00000000
    [ 1080.320000] 93d84c08 9354d288 9354ce38 6063e550 9200bc28
6001a7f3 93d84780 92008000
    [ 1080.320000]        92008000 93d84780 9200bc88 604345ad 9200bc48
9354ce00 9200bc88 92008000
    [ 1080.320000]        00000001 93d84780 93588060 00000001
ffffffffffffffff 00000000 9200bce8 604357cd
    [ 1080.320000] Call Trace:
    [ 1080.320000] 9200bc00:  [<6001a7f3>] _switch_to+0x5e/0xae
    [ 1080.320000] 9200bc30:  [<604345ad>] schedule+0x240/0x27a
    [ 1080.320000] 9200bc90:  [<604357cd>] rwsem_down_failed_common+0xb8/0xd8
    [ 1080.320000] 9200bcf0:  [<

[uml-user] coverage in linux kernel with gcov under uml ?

Arthur Lambert — 2012-03-09T10:25:05

Hi,

I am using UML virtualization with cloonix. I have a kernel module to test
with gcov.
So I need to do coverage in linux kernel with uml.

I read some information on gcov with uml on your website, but you only talk
about gcov in user space.

Can i do coverage on a module kernel with uml ?

Currently, I build a custom uml linux with configure that you can find here:
https://docs.google.com/document/pub?id=1yqr4XlDNyou0mRTtjhoQhWjhSZI6Mi8UY9w1ruYIYWY

the kernel version that I use is 3.0.9.

The problem is, when i try to mount debugfs wirth:
mount -t debugfs none /sys/kernel/debug, gcov debugfs is not mounted.

In a normal way, this command must mount a folder gcov in /sys/kernel/debug.

Someone have a solution for me ?

My apologize for my English
Thanks in advance,

Arthur Lambert.
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Re: [uml-user] uml upload speed capped at 46KB/s

Riccardo Murri — 2012-03-08T10:57:06

Hello,

On Sat, Jun 25, 2011 at 15:28, Manfred Haertel
<Manfred.Haertel< at >rz-online.de> wrote:

Debian has merged this patch into their slirp package starting from
version 1.0.17-6.  So the `slirp-fullbolt` command on wheezy will soon
implement a real full-bolt :-)

See: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=658359

Thanks for the patch!

Riccardo

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[uml-user] suspend-to-disk support in UML?

Riccardo Murri — 2012-03-07T16:19:32

Hello,

Is there any kind of support for suspend-to-disk functionality for
UML? (already available or being worked on or planned?)

I understand there used to be some kind of support[1] for it in the
past, but its development seems to have ended some years ago.

[1]: http://sourceforge.net/projects/sbuml/

Thanks,
Riccardo

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Re: [uml-user] SKAS host patches and wiki

Antoine Martin — 2012-02-16T17:16:49

Oh, and I've also updated:
http://fs.devloop.org.uk/
You may need to force your browser to refresh to see it properly
(shift-reload). It now shows which filesystems do (or do not) work with
UML and/or KVM, this should prevent a lot of unexpected issues.

Antoine





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Re: [uml-user] SKAS host patches and wiki

Antoine Martin — 2012-02-16T08:51:46

This is just a bunch of html pages at the moment, haven't really thought
about using a wiki yet.. until then, feel free to send me stuff in
plain-text, patch or whatever and I'll edit them.

Cheers
Antoine


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Re: [uml-user] SKAS host patches and wiki

richard -rw- weinberger — 2012-02-15T21:42:45

Very nice!
Am I also allowed to edit the FAQ?

Re: [uml-user] SKAS host patches and wiki

Antoine Martin — 2012-02-15T20:47:48

I've started re-organizing and adding a FAQ:
http://uml.devloop.org.uk/faq.html
There's a lot of content spread out everywhere, plus I'm scouring the
mailing list for gems I know I have read but forgot to save..
This is going to take some time. It is a good idea to keep the old links
in place, there is a lot of information there, even if quite a large
portion of it is either outdated or no longer relevant..

Antoine

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Re: [uml-user] UML root image sharing

Riccardo Murri — 2012-02-14T16:27:50

Hello,

On Tue, Feb 14, 2012 at 13:25, Ritesh Raj Sarraf <rrs< at >researchut.com> wrote:

It's the "raw" image format.

Using the KVM tools, you can create one with "qemu-img create -f raw".

Otherwise just use "dd" as in:

  # create a 2GB raw disk image
  dd if=/dev/zero of=my_uml_disk.img bs=1m count=2048



Probably the simplest approach is to use KVM or VirtualBox to
install to partition the disk and install the OS on it.  Then you just
pick a UML kernel compatible with the OS on the disk image and start
it.  (I'm not sure VirtualBox can handle "raw" images, though.)

Use LABEL= or UUID= lines in /etc/fstab, or you'll run into troubles
as different virtualization systems use different device names for the
emulated disk (e.g., "/dev/ubda" vs. "/dev/xvda" vs. "/dev/sda" etc.)

Best regards,
Riccardo

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Re: [uml-user] UML root image sharing

Antoine Martin — 2012-02-14T15:57:53

See block devices here:
http://user-mode-linux.sourceforge.net/configure.html

As for partition tables and filesystem types, UML is a Linux kernel so
it will support whatever you compile in.

KVM can work with raw disks too, not sure about the others but you can
use their disk tools to convert to and from raw disks. More info here:
http://fs.devloop.org.uk/

Won't work. UML doesn't know what a VDI image is (or vmdk or whatever)

This has nothing to do with the partitions, it's the disk format.

Won't help.

Cheers
Antoine


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[uml-user] UML root image sharing

Ritesh Raj Sarraf — 2012-02-14T12:25:18

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Hello List,

Is there a particular format of the root image that UML uses?

My intent is to have one single image and use it across all different
virtualizations, i.e. use the same image with UML, VirtualBox, KVM etc.

I tried to boot with the VirtualBox vdi image but UML paniced stating
that it couldn't mount a file system off of that image. It was a
single partitioned root file system with no /boot or swap.

Does UML understand the partitions in an image?

Meanwhile I'll try with a partition-less image.


Ritesh

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in replies for quicker response
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Re: [uml-user] uml stuck on "Locating the top of the address space"

richard -rw- weinberger — 2012-02-14T09:10:16

On Tue, Feb 14, 2012 at 4:08 AM, Joakim Arfvidsson
<joakim< at >arfvidsson.com> wrote:

gdb has to ignore UML's SIGSEGV.
UML is using it to handle page faults.

Type "handle SIGSEGV noprint nostop pass" into gdb.


Not really. :(

Re: [uml-user] uml stuck on "Locating the top of the address space"

Joakim Arfvidsson — 2012-02-14T03:08:06

To debug, I ran UML in gdb. It segfaulted once during finding the bottom
limit, which is expected I guess.

I then interrupted it a couple of times while hanging on finding the top.
All interrupts hit the same line of code in task_size.c, so I think it's
stuck on the single line.

line 32 in
http://lxr.free-electrons.com/source/arch/x86/um/os-Linux/task_size.c
n = *address;

Does this tell you anything?


Locating the bottom of the address space ...
Program received signal SIGSEGV, Segmentation fault.
0x08078b9b in page_ok (page=<value optimized out>) at
arch/x86/um/os-Linux/task_size.c:32
32 arch/x86/um/os-Linux/task_size.c: No such file or directory.
in arch/x86/um/os-Linux/task_size.c
(gdb) c
Continuing.
0x0
Locating the top of the address space ... ^C
Program received signal SIGINT, Interrupt.
0x08078b9b in page_ok (page=<value optimized out>) at
arch/x86/um/os-Linux/task_size.c:32
32 in arch/x86/um/os-Linux/task_size.c



On Sun, Feb 12, 2012 at 3:41 PM, richard -rw- weinberger <
richard.weinberger< at >gmai

Re: [uml-user] SELinux inside a UML

Nicolas Greneche — 2012-02-13T13:54:47

Le 13/02/2012 11:34, richard -rw- weinberger a écrit :

That's it, I misunderstood this option. I changed from classic DAC to 
SELinux and it works.

Thanks Richard for spotting me this configuration setting !

Re: [uml-user] SELinux inside a UML

richard -rw- weinberger — 2012-02-13T10:34:37

On Mon, Feb 13, 2012 at 10:52 AM, Nicolas Greneche
<nicolas.greneche< at >univ-paris13.fr> wrote:

I meant, are you sure you've enabled the correct SELinux settings?
CONFIG_DEFAULT_SECURITY is a tricky one...

Re: [uml-user] SELinux inside a UML

Nicolas Greneche — 2012-02-13T09:52:52

Le 11/02/2012 13:03, richard -rw- weinberger a écrit :

Really sure ;)


Thanks for your feedback, now I'm sure that it is possible. I will keep 
on searching what I've done wrong.

Thank you again Richard !

Re: [uml-user] uml stuck on "Locating the top of the address space"

richard -rw- weinberger — 2012-02-12T23:41:22

On Mon, Feb 13, 2012 at 12:29 AM, Joakim Arfvidsson
<joakim< at >arfvidsson.com> wrote:

Can you please very this?
Just add a printf()...


???

Re: [uml-user] uml stuck on "Locating the top of the address space"

Joakim Arfvidsson — 2012-02-12T23:29:24

Yes, the CPU is pegged while this is happening. I've left it for an hour
with no results.

I looked at that code and couldn't really see a good reason for it to block
forever, except if the address space was so large it took a long time to
get through.

The host kernel is 2.6.32-220.4.1.el6.i686 #1 SMP

This is an Amazon EC2 instance, and I just found one hilarious workaround
for this. If I remove the "user-data" from the instance, UML starts working
again. User-data is a string that EC2 makes available to the running
instance as the response of an http request to a fake ip.



On Sun, Feb 12, 2012 at 3:08 PM, richard -rw- weinberger <
richard.weinberger< at >gmail.com> wrote:

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