On 1/17/07, Jeff Dike <[EMAIL PROTECTED]> wrote:
> On Wed, Jan 17, 2007 at 11:42:07AM +0530, Pravin wrote:
> > "kernel32-2.6.15.7-bb6" and "kernel32-2.6.15.7-bb6" gave same error as
> > following
> >
> > {{{
> > VFS: Mounted root (ext3 filesystem) readonly.
> > mapping stub code failed, errno = 12
> > Kernel panic - not syncing: start_userspace : expected SIGSTOP, got status
> > = 256
> > }}}
>
> In this case, I'd say you need to try a recent UML (and see below).
>
> > and with "kernel32-2.6.19.2" and "kernel32-2.6.17.13-gcc3.4.6 " i am getting
> > {{{
> > Checking for tmpfs mount on /dev/shm...OK
> > Checking PROT_EXEC mmap in /dev/shm/...failed: Operation not permitted
> > /dev/shm/ must be not mounted noexec
> > }}}
> >
> > In order to get rid of /dev/shm problem,
> > I tried to modify the "/etc/fstab" file directly on my own,
> > I added
> > {{{
> > shm /dev/shm tmpfs
> > exec 0 0
> > }}}
> > I also tried to change the options to defaults but its not working.
>
> Not working exactly how?
Even after these changes, i get same error as I was getting before these changes
{{{
Checking for tmpfs mount on /dev/shm...OK
Checking PROT_EXEC mmap in /dev/shm/...failed: Operation not permitted
/dev/shm/ must be not mounted noexec
}}}
>
> > I do need 2.6 kernel in UML mode running,
> > Can I get help about which exact version of kernel, and which excat version
> > of patch will work fine some file system....
>
> Any recent UML from kernel.org should boot any of the nagafix
> filesystems, I think - I have personal experience with 2-3 of the
> filesystems.
I downloaded latest source code of "linux-2.6.19.tar.gz" from
"http://www.kernel.org/pub/linux/kernel/v2.6/";
I configured and compiled it as
{{{
make menuconfig ARCH=um
make linux ARCH=um
}}}
and then tried to run it as followes
{{{
$ ./linux ./nagafix_try/Debian-3.1-x86-root_fs
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 tmpfs mount on /dev/shm...OK
Checking PROT_EXEC mmap in /dev/shm/...failed: Operation not permitted
/dev/shm/ must be not mounted noexec
}}}
I dont think is error is because of file-system of the contents of
/etc/fstab file inside the file system,
because it gives the same error even if wrong file system (ie wrong
path) is given.
I feel that this error is because of kernel itself.
>
> > Am i doing some basic mistake in doing all these experiments...?
>
> Probably, but I don't see enough information to figure out what.
Ok, I will give you all the steps that I have taken in doing above.
Please tell me if I am going wrong anywhere
I am using Debian system with kernel 2.6.18
"I have not modified my working kernel in any way for UML."
What I am done is
1) I downloaded kernel binaries from http://uml.nagafix.co.uk/
2) I downloaded the Debian 3.1 file system from the same location
3) I tried running downloaded kernel with downloaded file system
{{{
% /uml/nagafix_try$ ./kernel32-2.6.19.2 ubd0=Debian-3.1-x86-root_fs
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 tmpfs mount on /dev/shm...OK
Checking PROT_EXEC mmap in /dev/shm/...failed: Operation not permitted
/dev/shm/ must be not mounted noexec
}}}
--
Pravin Shinde
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