[uml-user] linux-v3.4-7644-g07acfc2 core dumped (not reliable)

Hello,

the current git kernel gave a core dump. The 2nd try to start my user
mode linuc image was fine. Nevertheless it follows the output at the
command line and the back trace.

Hope this helps 

...
io scheduler noop registered
io scheduler cfq registered (default)
tun: Universal TUN/TAP device driver, 1.6
tun: (C) 1999-2004 Max Krasnyansky <maxk <at> qualcomm.com>
TCP: cubic registered
NET: Registered protocol family 17
Key type dns_resolver registered
initlevel:7=late, 21 registered initcalls
Initialized stdio console driver
Console initialized on /dev/tty0
                                console [tty0] enabled, bootconsole disabled
console [tty0] enabled, bootconsole disabled
                                            Initializing software serial
port version 1
console [mc-1] enabled
 ubda: unknown partition table
 ubdb: unknown partition table
Netdevice 0 (7a:cf:14:11:67:01) :
TUN/TAP backend -
kjournald starting.  Commit interval 5 seconds
EXT3-fs (ubda): mounted filesystem with ordered data mode

[uml-user] mv failed, file away

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 ?

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

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:  [<60435814>] rwsem_down_read_failed+0x12/0x14
    [ 1080.320000] 9200bd00:  [<6002ecec>] call_rwsem_down_read_failed+0x14/0x24
    [ 1080.320000] 9200bd48:  [<60434fc2>] down_read+0x11/0x13
    [ 1080.320000] 9200bd58:  [<6007a6ec>] access_process_vm+0x45/0x147
    [ 1080.320000] 9200bdc8:  [<600cdd13>] proc_pid_cmdline+0x65/0xf9
    [ 1080.320000] 9200be18:  [<600cf298>] proc_info_read+0x68/0xcb
    [ 1080.320000] 9200be68:  [<6008f2c7>] vfs_read+0xa7/0x155
    [ 1080.320000] 9200bea8:  [<6008f42e>] sys_read+0x45/0x6c

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

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

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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[uml-user] UML root image sharing

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

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[uml-user] SELinux inside a UML

Hi,

I would like to create a SELinux aware UML. I compiled a ARCH=um kernel 
with SELinux activated.

The UML starts but SELinux seems to be disabled. Libselinux is installed 
so I have userspace tools to check selinux availability and mode 
(permissive, targeted or strict).

Does somebody have a positive feedback about putting SELinux inside a UML ?

Regards,

--

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Centre de Ressources Informatiques
Université Paris NORD / UP13
99, avenue Jean-Baptiste Clément
93430 Villetaneuse

Tel : 01 49 40 40 35
Fax : 01 48 22 81 50

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[uml-user] do UML guests need NTP?

Hello,

is NTP needed on UML VMs?

Or does the UML kernel take the time from the host kernel? (so it's
enough if the host runs NTP)

Thanks,
Riccardo

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[uml-user] UML networking setup

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[uml-user] Running 32bit binaries in a 64bit UML instance

Hi,
When running 'make menuconfig ARCH=uml' there is no 'Executable file
formats / Emulations' menu. I guess this makes sense since I guess
that only binaries that can be run on the host kernel can be run from
UML. Does this mean that if a x86_64 host kernel supports IA32
emulation then 32bit binaries can be run from inside the UML instance
as well? If so, does anything need to be enabled in the UML kernel
config to support it?

Cheers,
Nick

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