Hi Paolo,
Sorry for the long post.
Oh I had it all figured out until.......
ls: relocation error: /lib/libpthread.so.0: symbol errno, version
GLIBC_PRIVATE not defined in file libc.so.6 with link time reference
Turns out the obsolete threads compiler runtime library is broken.....
Googling isn't helping as this seems to be a new issue.... It's broken
in Gentoo as well.
Bugger! It's all working and I can login to. I just can't do an ls
without the relocation error. Lots of things run now.
It's looking like a rebuild of the libraries.
Phill.
=============================================================
Turns out the FC4 fix is really quite simple.
Just do this:
cp /lib/obsolete/linuxthreads/i686/*.so /lib
Do this in your root_fs image! not the host.
Now boot your UML! That's all there is to it for FC4.
I now have a working 32 bit FC4 UML on a 64 bit host (with 8G of swap -
i.e. unlimited UMLs).
I was about to post this (see below) when I thought of the solution.
Turns out the whole c compiler run-time with the old threads is just
sitting there in the distro.
FC5 is going to do away with the old threads completely, so work going
on I see in the list on NPTL is very important and timely.
It might be a timesave for all concerned if a pristine FC4 root_fs is
uploaded (somewhere) with this done until NPTL support is going. (Anyone
who does this, please turn off selinux too).
I think the conclusions reached here also accounts for quite a few posts
I see where the host kernel seems to effect the UML's programs. If NPTL
programs are running inside a UML then they depend on the host kernel
and skas3 to do so.
Cheers
Phill.
============================================================
Making progress.... but I think I'm now snookered by NPTL.
I've run up this UML kernel:
Fedora Core release 4 (Stentz)
Kernel 2.6.12-bb10-skas0 on an x86_64
Unauthorized access to this system is strictly prohibited.
uml-test login:
Then from home on my 32 bit box I do this to connect to the sshd on the
virtual ethernet:
[EMAIL PROTECTED] ~]$ ssh [EMAIL PROTECTED]
[EMAIL PROTECTED]'s password:
Last login: Sat Aug 6 10:14:34 2005 from 192.168.1.6
cannot set up thread-local storage: cannot set up LDT for thread-local
storage
Connection to 10.1.1.201 closed.
[EMAIL PROTECTED]
My guess is for FC4 to login I need recompile /bin/login (and possibly
PAM friends) so they don't use NPTL. Either that or I need a login
replacement....:-(
Let me preface my next comment with: I don't really understand what's
happening! but given it all works with skas3 in 32 bit mode, I assume
that the thread-local storage business is being handled by the host in
skas3 mode (which is not available yet in x86-64 kernels).
In TT mode it (thread-local storage) causes crashes for the time being,
while in skas0 mode we get a nicely handled error from the application
(or more precisely the c-compiler's runtime library) indicating the
failure.
OK that said: does anyone know how to get logged in without /bin/login?
The option of recompiling login sounds reeeely hard as a workaround,
since I'd have to rebuild the libraries....
Cheers
Phill.
On Fri, 2005-08-05 at 17:30 +0200, Blaisorblade wrote:
> On Friday 05 August 2005 06:33, Phill Wombat wrote:
> > Fedora Core release 4 (Stentz)
> > Kernel 2.6.12-bs9 on an x86_64
> >
> > Unauthorized access to this system is strictly prohibited.
> > uml-test login:
> >
> > But I can't log in...... :-(
> Must at least add /dev/console to /etc/securetty (location may vary) and
> running "login" from command line could be problematic, probably use "setsid
> login" instead of login or add a "mingetty" line to /etc/inittab for runlevel
> 1.
> > So far the config is: Bog standard install of FC4 x86_64 on the host (no
> > patch... no nothing).
> > UML is as per above.
> > I added "single LD_LIBRARY_PATH=/lib/obsolete/linuxthreads" to the command
> > line before running up UML.
> > When single user mode came up I used chkconfig to turn just about
> > everything off. Then I edited /etc/rc.d/rc.sysinit to remove the
> > troublesome bits (as per previous post). Then I exited and it started
> > normally.
> >
> > If I run /bin/login from the single user mode prompt here's where I end up
> > (I did this because I feel it is related). Any ideas welcome (there's a
> > segfault in the init script somewhere which I'll comment out in due
> > course). I've also commented out the /etc/pam.d/login line with the .so
> > module (as per previous post).
> >
> > The Detaching pid xxxxx seems to be the kiss of death.
> >
> > [EMAIL PROTECTED] shared]# ./run_uml.sh
> > Checking PROT_EXEC mmap in /tmp...OK
> > tracing thread pid = 23488
> > Linux version 2.6.12-bs9 ([EMAIL PROTECTED]) (gcc version 4.0.0
> > 20050519 (Red Hat 4.0.0-8)) #1 Thu Aug 4 21:52:00 EST 2005
> > Built 1 zonelists
> > Kernel command line: single mem=160m mode=tt ubda=root_fs.fc4 ubdb=swap
> > root=/dev/ubda con=pty con0=fd:0,fd:1
> > LD_LIBRARY_PATH=/lib/obsolete/linuxthreads
> > PID hash table entries: 1024 (order: 10, 16384 bytes)
> > Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
> > Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
> > Memory: 157696k available
> > Mount-cache hash table entries: 512
> > Checking for host processor cmov support...Yes
> > Checking for host processor xmm support...No
> > Checking that ptrace can change system call numbers...OK
> > Checking syscall emulation patch for ptrace...missing
> > Checking that host ptys support output SIGIO...Yes
> > Checking that host ptys support SIGIO on close...No, enabling workaround
> > Checking for /dev/anon on the host...Not available (open failed with errno
> > 2)
> > NET: Registered protocol family 16
> > mconsole (version 2) initialized on /root/.uml/FQRHtz/mconsole
> > ubd: Synchronous mode
> > VFS: Disk quotas dquot_6.5.1
> > Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
> > io scheduler noop registered
> > io scheduler anticipatory registered
> > io scheduler deadline registered
> > io scheduler cfq registered
> > NET: Registered protocol family 2
> > IP: routing cache hash table of 1024 buckets, 8Kbytes
> > TCP established hash table entries: 8192 (order: 4, 65536 bytes)
> > TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
> > TCP: Hash tables configured (established 8192 bind 8192)
> > NET: Registered protocol family 1
> > NET: Registered protocol family 17
> > Initialized stdio console driver
> > Console initialized on /dev/tty0
> > Initializing software serial port version 1
> > ubda: unknown partition table
> > ubdb: unknown partition table
> > EXT3-fs: INFO: recovery required on readonly filesystem.
> > EXT3-fs: write access will be enabled during recovery.
> > kjournald starting. Commit interval 5 seconds
> > EXT3-fs: recovery complete.
> > EXT3-fs: mounted filesystem with ordered data mode.
> > VFS: Mounted root (ext3 filesystem) readonly.
> > line_ioctl: tty0: ioctl KDSIGACCEPT called
> > INIT: version 2.85 booting
> > line_ioctl: tty0: ioctl TIOCLINUX called
> > Welcome to Fedora Core
> > Press 'I' to enter interactive startup.
> > Starting udev: [FAILED]
> > Initializing hardware... storage network audio done[ OK ]
> > Setting clock : Fri Aug 5 00:16:29 EDT 2005 [ OK ]
> > Setting hostname uml-test.goober.org: [ OK ]
> > set_thread_area failed when setting up thread-local storage
> > /etc/rc.d/rc.sysinit: line 340: 694 Done echo
> > "mkdmnod" 695 Segmentation fault | /sbin/nash --quiet >/dev/null 2>&1
> > Remounting root filesystem in read-write mode: [ OK ]
> > Mounting local filesystems: [ OK ]
> > Enabling local filesystem quotas: [ OK ]
> > Enabling swap space: [ OK ]
> > sh-3.00# /bin/login
> > login: root
> > Password:
> > login(pam_unix)[772]: session opened for user root by (uid=0)
> > -- root[772]: ROOT LOGIN ON console
> > Detaching pid 26521
> >
> >
> >
> >
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