[Netkit.users] Building a Custom Netkit Kernel

Costa >> rui.rcosta at gmail.com
Fri Sep 16 17:24:02 CEST 2011 

Dear Massimo,

Doing the command "mount | grep lib/modules" on the virtual machine outputs
nothing.
Makes sense since it did not load it.

And yes, the path
"my/own/path/netkit/kernel/modules/lib/modules/2.6.28-netkit-K2.8/"
is there correctly and contains "modules.dep" file and several others...

Regards,
Rui Costa


On Thu, Sep 15, 2011 at 3:32 PM, Massimo Rimondini <rimondin at dia.uniroma3.it
> wrote:

> **
> Dear Rui,
>
>  As for the current issue I understand what you say.
> However the kernel modules and "modules.dep" files are in the correct
> location: /your/own/path/kernel/modules/lib/modules/2.6.28-netkit-K2.8/
>
>
> Fine.
>
>  And despite this, the error output states:
> "Loading kernel modules...FATAL: Could not load
> /lib/modules/2.6.28-netkit-K2.8/modules.dep: No such file or directory"
> Which makes me think it actually is looking in /lib/modules/...
>
>
> Right. But that is the /lib/modules directory inside the virtual machine,
> which is mapped to a different path on the host. You can get the actual path
> by issuing the following command inside any virtual machine:
>
> pc1:~# mount | grep lib/modules
> none on /lib/modules type hostfs
> (rw,/home/max/netkit/kernel/modules/lib/modules)
>
>
> However, considering your reply, I see this is not really relevant, and
> other path issues should already have been ruled out by setting the
> CONFIG_LOCALVERSION parameter to "-netkit-K2.8".
>
> Could you check whether
> /your/own/path/kernel/modules/lib/modules/2.6.28-netkit-K2.8/ actually
> contains the modules.dep file?
> If not, you could be able to generate that file by hand by using the depmod
> tool.
>
> Regards,
> Massimo
>
>
>
>
> Best Regards,
> Rui Costa
>
>
>
>
> On Thu, Sep 15, 2011 at 2:02 PM, Massimo Rimondini <
> rimondin at dia.uniroma3.it> wrote:
>
>>  Dear Rui,
>>
>> it would be interesting to know in more detail what you mean when you say
>> "still does not boot as a Netkit node".
>> However, if it's just a folder issue, it is likely easily solvable.
>> Consider that, when you tell Netkit to use a custom kernel in your/own/path,
>> compiled modules will be looked for in your/own/path/modules/lib/modules.
>> Does this help somehow?
>> The problem described in the post you mention should have been solved as
>> of Netkit release 2.8.
>>
>> Regards,
>>  Massimo
>>
>> On 09/15/2011 12:07 PM, Costa >> wrote:
>>
>> Dear Massimo,
>>
>> Thank you very much for your help!
>> It seems that part of the problem is solved.
>> Although kernel.org is down I got the kernel sources from Linus Torvalds
>> github.
>> I tried a few kernels manually until I got one that booted as a netkit
>> node:
>>
>> => kernel v2.6.27.0 does the uml patch ok, has issues with an already
>> reported bug on vde_user.c, has a bug on making the kernel oldconfig
>> (already reported), but still does not boot as a netkit node.
>>
>>  => kernel v2.6.31.0 has issues with the uml patch which be skipped, has
>> the same bug on making the kernel oldconfig (already reported), but still
>> does not boot as a netkit node.
>>
>> => kernel v2.6.28.0 has issues with the uml patch which be skipped, has
>> the same bug on making the kernel oldconfig (already reported), boots
>> _almost_ ok as netkit node.
>>
>> It has a fatal error on loading the "modules.dep" file from v2.6.28-0. It
>> seems that it can't find the file belonging to kernel v2.6.28.0-k2.8. It
>> seems that is searching on the wrong folder.. i'm not sure if it's because
>> i've been passing the kernel path as an argument on the vstart command (a
>> similar issue has been reported on
>> http://list.dia.uniroma3.it/pipermail/netkit.users/2010-August/000638.html
>> )
>> Any ideas on how to solve this modules.dep path ?
>>
>> Best regards,
>> Rui Costa
>>
>>
>>
>>
>> On Mon, Sep 12, 2011 at 2:57 PM, Massimo Rimondini <
>> rimondin at dia.uniroma3.it> wrote:
>>
>>>  Dear Rui,
>>>
>>> not really useless. It may still be possible to apply them with minor
>>> offsets. I would give them a --dry-run try and see what happens.
>>> Or it may also be that the fixes/functionalities they provide are no
>>> longer necessary. Consider that about half of the provided patches are only
>>> required for MPLS support to work.
>>>
>>> Regards,
>>>  Massimo
>>>
>>> On 09/12/2011 02:52 PM, Costa >> wrote:
>>>
>>> Dear Massimo,
>>>
>>> compiling for a newer kernel won't make the UML patch useless?
>>> I thought that the UML patch provided in netkit is specific for kernel
>>> 2.6.26.5.
>>> For a newer kernel the files are not the same or don't have the same
>>> content
>>> and therefore the same patch wouldn't work correct?
>>>
>>>
>>> Best Regards,
>>> Rui Costa
>>>
>>>
>>>
>>>  On Sat, Sep 10, 2011 at 3:00 PM, Massimo Rimondini <
>>> rimondin at dia.uniroma3.it> wrote:
>>>
>>>>  Dear Rui,
>>>>
>>>> could you try by recompiling a more recent version of the kernel?
>>>> The Makefile contains appropriate parameters to choose the release to
>>>> work on, see
>>>> https://github.com/maxonthegit/netkit-uml-kernel/blob/master/Makefile.devel#L35.
>>>> Most likely, you will need to disable MPLS support, which requires quite a
>>>> bit of tweaking of the Makefile itself (or just a round of kernel
>>>> compilation by hand).
>>>>
>>>> Regards,
>>>> Massimo
>>>>
>>>> Il 09/09/2011 16.25, Costa >> ha scritto:
>>>>
>>>>
>>>> Hi all,
>>>>
>>>> I'm new with netkit as well as with kernel building and I'm
>>>> having some trouble setting up a custom kernel for netkit.
>>>> I've tried both the ways that come in netkit's documentation
>>>> (automatic and manual) and tried a few more tweaks by myself.
>>>>
>>>> Compiling the customized kernel always goes OK, in whatever
>>>> way I do it, but the netkit's virtual machines crash on
>>>> booting. The trace results (you can check them at the end of
>>>> the e-mail below) are always extremely similar to another
>>>> issue reported on the netkit mailing list:
>>>>
>>>> http://list.dia.uniroma3.it/pipermail/netkit.users/2010-November/000686.html
>>>> I've also tried the approach explained in this thread but
>>>> ended up with the same result as before.
>>>>
>>>>
>>>> Does anyone have any hint on what is causing this or how to
>>>> solve it?
>>>>
>>>> Thanks in advance,
>>>> Best Regards,
>>>>
>>>> Rui Costa
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Here is the Netkit output:
>>>>
>>>> ============= Starting virtual machine "pc1" =============
>>>>    Kernel:
>>>> /home/user-netkit/Desktop/netkit/custom-kernel/netkit/kernel/linu
>>>> x-2.6.26.5/linux
>>>>    Memory:     32 MB
>>>>    Model fs:   /home/user-netkit/Desktop/netkit/netkit/fs/netkit-fs
>>>>    Filesystem: /home/user-netkit/Desktop/netkit/pc1.disk (new)
>>>>    Hostfs at:  /home/user-netkit
>>>>    Other args: sch_teql.max_equalizers=0
>>>>
>>>> Running ==>
>>>> /home/user-netkit/Desktop/netkit/custom-kernel/netkit/kernel/linux-2
>>>> .6.26.5/linux name=pc1 title=pc1 umid=pc1 mem=36M
>>>> ubd0=/home/user-netkit/Desktop
>>>> /netkit/pc1.disk,/home/user-netkit/Desktop/netkit/netkit/fs/netkit-fs
>>>> root=98:1
>>>> uml_dir=/home/user-netkit/.netkit/mconsole hosthome=/home/user-netkit
>>>> sch_teql.
>>>> max_equalizers=0 quiet con0=fd:0,fd:1 con1=null SELINUX_INIT=0
>>>> Locating the bottom of the address space ... 0x10000
>>>> Locating the top of the address space ... 0xc0000000
>>>> Core dump limits :
>>>>         soft - 0
>>>>         hard - NONE
>>>> 0xc0000000
>>>> Core dump limits :
>>>>         soft - 0
>>>>         hard - NONE
>>>> 0xc0000000
>>>> Core dump limits :
>>>>         soft - 0
>>>>         hard - NONE
>>>> 0xc0000000
>>>> Core dump limits :
>>>>         soft - 0
>>>>         hard - NONE
>>>> Checking for tmpfs mount on /dev/shm...OK
>>>> Checking PROT_EXEC mmap in /dev/shm/...OK
>>>> OK
>>>> OK
>>>> OK
>>>> UML running in SKAS0 mode
>>>> Adding 2260992 bytes to physical memory to account for exec-shield gap
>>>> Checking that ptrace can change system call numbers...OK
>>>> Checking syscall emulation patch for ptrace...OK
>>>> Checking advanced syscall emulation patch for ptrace...OK
>>>> Checking for the skas3 patch in the host:
>>>>   - /proc/mm...not found: No such file or directory
>>>>   - PTRACE_FAULTINFO...not found
>>>>   - PTRACE_LDT...not found
>>>> *** buffer overflow detected ***:
>>>> /home/user-netkit/Desktop/netkit/custom-kernel
>>>> /netkit/kernel/linux-2.6.26.5/linux terminated
>>>> ======= Backtrace: =========
>>>> /lib/tls/i686/cmov/libc.so.6(__fortify_fail+0x50)[0x1f2390]
>>>> /lib/tls/i686/cmov/libc.so.6(+0xe12ca)[0x1f12ca]
>>>> /lib/tls/i686/cmov/libc.so.6(+0xe0c29)[0x1f0c29]
>>>> /lib/tls/i686/cmov/libc.so.6(__snprintf_chk+0x34)[0x1f0b14]
>>>>
>>>> /home/user-netkit/Desktop/netkit/custom-kernel/netkit/kernel/linux-2.6.26.5/linu
>>>> x[0x808cdee]
>>>> [0x0]
>>>> ======= Memory map: ========
>>>> 00110000-00263000 r-xp 00000000 68:01 9438224
>>>> /lib/tls/i686/cmov/libc-2.11.1.
>>>> so
>>>> 00263000-00264000 ---p 00153000 68:01 9438224
>>>> /lib/tls/i686/cmov/libc-2.11.1.
>>>> so
>>>> 00264000-00266000 r-xp 00153000 68:01 9438224
>>>> /lib/tls/i686/cmov/libc-2.11.1.
>>>> so
>>>> 00266000-00267000 rwxp 00155000 68:01 9438224
>>>> /lib/tls/i686/cmov/libc-2.11.1.
>>>> so
>>>> 00267000-0026a000 rwxp 00000000 00:00 0
>>>> 0026a000-00272000 r-xp 00000000 68:01 9438245
>>>> /lib/tls/i686/cmov/libnss_nis-2
>>>> .11.1.so
>>>> 00272000-00273000 r-xp 00007000 68:01 9438245
>>>> /lib/tls/i686/cmov/libnss_nis-2
>>>> .11.1.so
>>>> 00273000-00274000 rwxp 00008000 68:01 9438245
>>>> /lib/tls/i686/cmov/libnss_nis-2
>>>> .11.1.so
>>>> 00276000-00291000 r-xp 00000000 68:01 9306137    /lib/ld-2.11.1.so
>>>> 00291000-00292000 r-xp 0001a000 68:01 9306137    /lib/ld-2.11.1.so
>>>> 00292000-00293000 rwxp 0001b000 68:01 9306137    /lib/ld-2.11.1.so
>>>> 00402000-00404000 rwxp 00000000 00:00 0
>>>> 00429000-00446000 r-xp 00000000 68:01 9306195    /lib/libgcc_s.so.1
>>>> 00446000-00447000 r-xp 0001c000 68:01 9306195    /lib/libgcc_s.so.1
>>>> 00447000-00448000 rwxp 0001d000 68:01 9306195    /lib/libgcc_s.so.1
>>>> 004f9000-004fc000 rwxp 00000000 00:00 0
>>>> 00681000-00694000 r-xp 00000000 68:01 9438235
>>>> /lib/tls/i686/cmov/libnsl-2.11.
>>>> 1.so
>>>> 00694000-00695000 r-xp 00012000 68:01 9438235
>>>> /lib/tls/i686/cmov/libnsl-2.11.
>>>> 1.so
>>>> 00695000-00696000 rwxp 00013000 68:01 9438235
>>>> /lib/tls/i686/cmov/libnsl-2.11.
>>>> 1.so
>>>> 00696000-00698000 rwxp 00000000 00:00 0
>>>> 0072f000-00730000 rwxp 00000000 00:00 0
>>>> 00747000-00748000 rwxp 00000000 00:00 0
>>>> 008a2000-008a3000 r-xp 00000000 00:00 0          [vdso]
>>>> 009c0000-009ca000 r-xp 00000000 68:01 9438241
>>>> /lib/tls/i686/cmov/libnss_files
>>>> -2.11.1.so
>>>> 009ca000-009cb000 r-xp 00009000 68:01 9438241
>>>> /lib/tls/i686/cmov/libnss_files
>>>> -2.11.1.so
>>>> 009cb000-009cc000 rwxp 0000a000 68:01 9438241
>>>> /lib/tls/i686/cmov/libnss_files
>>>> -2.11.1.so
>>>> 00d36000-00d37000 rwxp 00000000 00:00 0
>>>> 00d9b000-00d9d000 r-xp 00000000 68:01 9438258
>>>> /lib/tls/i686/cmov/libutil-2.11
>>>> .1.so
>>>> 00d9d000-00d9e000 r-xp 00001000 68:01 9438258
>>>> /lib/tls/i686/cmov/libutil-2.11
>>>> .1.so
>>>> 00d9e000-00d9f000 rwxp 00002000 68:01 9438258
>>>> /lib/tls/i686/cmov/libutil-2.11
>>>> .1.so
>>>> 00e05000-00e0b000 r-xp 00000000 68:01 9438237
>>>> /lib/tls/i686/cmov/libnss_compa
>>>> t-2.11.1.so
>>>> 00e0b000-00e0c000 r-xp 00006000 68:01 9438237
>>>> /lib/tls/i686/cmov/libnss_compa
>>>> t-2.11.1.so
>>>> 00e0c000-00e0d000 rwxp 00007000 68:01 9438237
>>>> /lib/tls/i686/cmov/libnss_compa
>>>> t-2.11.1.so
>>>> 08048000-08422000 rwxp 00000000 68:01 12327718
>>>> /home/user-netkit/Desktop/netki
>>>> t/custom-kernel/netkit/kernel/linux-2.6.26.5/linux
>>>> 08422000-08446000 rwxp 00000000 00:00 0
>>>> 0864d000-0866e000 rwxp 00000000 00:00 0          [heap]
>>>> 0866e000-0a670000 rwxs 00626000 00:10 8225       /dev/shm/vm_file-RhLyFA
>>>> (delete
>>>> d)
>>>> bf8fb000-bf910000 rwxp 00000000 00:00 0          [stack]
>>>> Terminated
>>>>
>>>>
>>>>
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