Hello,
 I play with uml for some time and I went to some troubles starting the 2.6.24 
and .25 kernels on themselves. With 2.6.23 host kernel, they worked. I found 
out that some of huge changes in the linus tree went a bit wrong or too 
different during that including xen, SKAS3 and uml itself. I was not succesfull 
running any of those two lines.

I tryed 2.6.26-rc7 for both host and guest, I worked fine, also rc8 did. Right 
now I compiled from the same .configs 2.6.26 and again, it falls down, what 
changed is, that it is the uml version on which the success depends, not 
version of host.
.configs are long, so i uploaded them to http://uml-sys.sf.net/.config-host and 
.config-guest

Thanks for any info or suggestions
David

uml kernel messages:

Locating the bottom of the address space ... 0x0
Locating the top of the address space ... 0xc0000000
Core dump limits :
        soft - NONE
        hard - NONE
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/...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
UML running in SKAS0 mode
Adding 10309632 bytes to physical memory to account for exec-shield gap
Linux version 2.6.26 ([EMAIL PROTECTED]) (gcc version 4.1.2 20061115 
(prerelease) (Debian 4.1.1-21)) #1 Tue Jul 15 00:02:41 CEST 2008
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 262593
Kernel command line: mem=1024M ubd0=/srv/systems/etch2.img eth0=tuntap,tap006-0 
root=98:0
PID hash table entries: 4096 (order: 12, 16384 bytes)
------------------------
| Locking API testsuite:
----------------------------------------------------------------------------
                                 | spin |wlock |rlock |mutex | wsem | rsem |
  --------------------------------------------------------------------------
                     A-A deadlock:failed|failed|  ok  |failed|failed|failed|
                 A-B-B-A deadlock:failed|failed|  ok  |failed|failed|failed|
             A-B-B-C-C-A deadlock:failed|failed|  ok  |failed|failed|failed|
             A-B-C-A-B-C deadlock:failed|failed|  ok  |failed|failed|failed|
         A-B-B-C-C-D-D-A deadlock:failed|failed|  ok  |failed|failed|failed|
         A-B-C-D-B-D-D-A deadlock:failed|failed|  ok  |failed|failed|failed|
         A-B-C-D-B-C-D-A deadlock:failed|failed|  ok  |failed|failed|failed|
                    double unlock:  ok  |  ok  |failed|  ok  |failed|failed|
                  initialize held:failed|failed|failed|failed|failed|failed|
                 bad unlock order:  ok  |  ok  |  ok  |  ok  |  ok  |  ok  |
  --------------------------------------------------------------------------
              recursive read-lock:             |  ok  |             |failed|
           recursive read-lock #2:             |  ok  |             |failed|
            mixed read-write-lock:             |failed|             |failed|
            mixed write-read-lock:             |failed|             |failed|
  --------------------------------------------------------------------------
     hard-irqs-on + irq-safe-A/12:failed|failed|  ok  |
     soft-irqs-on + irq-safe-A/12:failed|failed|  ok  |
     hard-irqs-on + irq-safe-A/21:failed|failed|  ok  |
     soft-irqs-on + irq-safe-A/21:failed|failed|  ok  |
       sirq-safe-A => hirqs-on/12:failed|failed|  ok  |
       sirq-safe-A => hirqs-on/21:failed|failed|  ok  |
         hard-safe-A + irqs-on/12:failed|failed|  ok  |
         soft-safe-A + irqs-on/12:failed|failed|  ok  |
         hard-safe-A + irqs-on/21:failed|failed|  ok  |
         soft-safe-A + irqs-on/21:failed|failed|  ok  |
    hard-safe-A + unsafe-B #1/123:failed|failed|  ok  |
    soft-safe-A + unsafe-B #1/123:failed|failed|  ok  |
    hard-safe-A + unsafe-B #1/132:failed|failed|  ok  |
    soft-safe-A + unsafe-B #1/132:failed|failed|  ok  |
    hard-safe-A + unsafe-B #1/213:failed|failed|  ok  |
    soft-safe-A + unsafe-B #1/213:failed|failed|  ok  |
    hard-safe-A + unsafe-B #1/231:failed|failed|  ok  |
    soft-safe-A + unsafe-B #1/231:failed|failed|  ok  |
    hard-safe-A + unsafe-B #1/312:failed|failed|  ok  |
    soft-safe-A + unsafe-B #1/312:failed|failed|  ok  |
    hard-safe-A + unsafe-B #1/321:failed|failed|  ok  |
    soft-safe-A + unsafe-B #1/321:failed|failed|  ok  |
    hard-safe-A + unsafe-B #2/123:failed|failed|  ok  |
    soft-safe-A + unsafe-B #2/123:failed|failed|  ok  |
    hard-safe-A + unsafe-B #2/132:failed|failed|  ok  |
    soft-safe-A + unsafe-B #2/132:failed|failed|  ok  |
    hard-safe-A + unsafe-B #2/213:failed|failed|  ok  |
    soft-safe-A + unsafe-B #2/213:failed|failed|  ok  |
    hard-safe-A + unsafe-B #2/231:failed|failed|  ok  |
    soft-safe-A + unsafe-B #2/231:failed|failed|  ok  |
    hard-safe-A + unsafe-B #2/312:failed|failed|  ok  |
    soft-safe-A + unsafe-B #2/312:failed|failed|  ok  |
    hard-safe-A + unsafe-B #2/321:failed|failed|  ok  |
    soft-safe-A + unsafe-B #2/321:failed|failed|  ok  |
      hard-irq lock-inversion/123:failed|failed|  ok  |
      soft-irq lock-inversion/123:failed|failed|  ok  |
      hard-irq lock-inversion/132:failed|failed|  ok  |
      soft-irq lock-inversion/132:failed|failed|  ok  |
      hard-irq lock-inversion/213:failed|failed|  ok  |
      soft-irq lock-inversion/213:failed|failed|  ok  |
      hard-irq lock-inversion/231:failed|failed|  ok  |
      soft-irq lock-inversion/231:failed|failed|  ok  |
      hard-irq lock-inversion/312:failed|failed|  ok  |
      soft-irq lock-inversion/312:failed|failed|  ok  |
      hard-irq lock-inversion/321:failed|failed|  ok  |
      soft-irq lock-inversion/321:failed|failed|  ok  |
      hard-irq read-recursion/123:  ok  |
      soft-irq read-recursion/123:  ok  |
      hard-irq read-recursion/132:  ok  |
      soft-irq read-recursion/132:  ok  |
      hard-irq read-recursion/213:  ok  |
      soft-irq read-recursion/213:  ok  |
      hard-irq read-recursion/231:  ok  |
      soft-irq read-recursion/231:  ok  |
      hard-irq read-recursion/312:  ok  |
      soft-irq read-recursion/312:  ok  |
      hard-irq read-recursion/321:  ok  |
      soft-irq read-recursion/321:  ok  |
--------------------------------------------------------
142 out of 218 testcases failed, as expected. |
----------------------------------------------------
Dentry cache hash table entries: 262144 (order: 8, 1048576 bytes)
Inode-cache hash table entries: 131072 (order: 7, 524288 bytes)
Memory: 1025792k available
SLUB: Genslabs=12, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Mount-cache hash table entries: 512
Checking for host processor cmov support...Yes
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
net_namespace: 508 bytes
NET: Registered protocol family 16
NET: Registered protocol family 2
IP route cache hash table entries: 65536 (order: 6, 262144 bytes)
TCP established hash table entries: 262144 (order: 9, 2097152 bytes)
TCP bind hash table entries: 65536 (order: 8, 1310720 bytes)
TCP: Hash tables configured (established 262144 bind 65536)
TCP reno registered
NET: Registered protocol family 1
Checking host MADV_REMOVE support...OK
mconsole (version 2) initialized on /home/umls/etch2/.uml/o34EiA/mconsole
Mapper v0.1
mmapper_init - find_iomem failed
ubd: Synchronous mode
UML Watchdog Timer
Host TLS support detected
Detected host type: i386 (GDT indexes 6 to 9)
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
fuse init (API version 7.9)
msgmni has been set to 2004
io scheduler noop registered
io scheduler deadline registered (default)
brd: module loaded
loop: module loaded
SoftDog: cannot register miscdev on minor=130 (err=-16)
Netfilter messages via NETLINK v0.30.
nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
ip_tables: (C) 2000-2006 Netfilter Core Team
ClusterIP Version 0.8 loaded successfully
arp_tables: (C) 2002 David S. Miller
TCP cubic registered
NET: Registered protocol family 17
Bridge firewalling registered
Ebtables v2.0 registered
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
802.1Q VLAN Support v1.8 Ben Greear <[EMAIL PROTECTED]>
All bugs added by David S. Miller <[EMAIL PROTECTED]>
Initialized stdio console driver
Console initialized on /dev/tty0
console [tty0] enabled
Initializing software serial port version 1
console [mc-1] enabled
 ubda: unknown partition table
Choosing a random ethernet address for device eth0
Netdevice 0 (86:17:38:79:36:c9) : <6>TUN/TAP backend -
ReiserFS: ubda: found reiserfs format "3.6" with standard journal
ReiserFS: ubda: using ordered data mode
ReiserFS: ubda: journal params: device ubda, size 8192, journal first block 18, 
max trans len 1024, max batch 900, max commit age 30, max trans age 30
ReiserFS: ubda: checking transaction log (ubda)
ReiserFS: ubda: replayed 30 transactions in 2 seconds
ReiserFS: ubda: Using r5 hash to sort names
VFS: Mounted root (reiserfs filesystem) readonly.
Registers -
        0       0x0
        1       0x0
        2       0x0
        3       0x0
        4       0x0
        5       0x0
        6       0x0
        7       0x0
        8       0x0
        9       0x0
        10      0x0
        11      0x0
        12      0x0
        13      0x0
        14      0x0
        15      0x0
        16      0x0
Kernel panic - not syncing: do_syscall_stub : PTRACE_SETREGS failed, errno = 5


EIP: 0073:[<082e4371>] CPU: 0 Not tainted ESP: 007b:bff9c710 EFLAGS: 00000246
    Not tainted
EAX: 00000000 EBX: 000026e5 ECX: 00000013 EDX: 000026e5
ESI: 000026e1 EDI: 00000000 EBP: 00000002 DS: 007b ES: 007b
4847bd00:  [<0809c043>] notifier_call_chain+0x43/0x90
4847bd24:  [<0809c0ee>] atomic_notifier_call_chain+0x2e/0x40
4847bd3c:  [<08080e26>] panic+0x76/0x130
4847bd5c:  [<080724b3>] run_syscall_stub+0x2f3/0x300
4847bd90:  [<0807442d>] write_ldt_entry+0x1ad/0x1c0
4847bdd8:  [<08074d02>] init_new_ldt+0x2a2/0x3f0
4847bdf0:  [<080af3be>] __alloc_pages_internal+0x8e/0x480
4847be1c:  [<080730e5>] start_userspace+0x1a5/0x1f0
4847be50:  [<08061cd1>] init_new_context+0x91/0x140
4847be6c:  [<080d5c09>] bprm_mm_init+0x49/0x1c0
4847be78:  [<080cc482>] kmem_cache_alloc+0x52/0xc0
4847be98:  [<080d7524>] do_execve+0x74/0x1f0
4847bebc:  [<0805d49f>] execve1+0x2f/0x70
4847bedc:  [<0805d544>] um_execve+0x14/0x50
4847beec:  [<0805fd7f>] kernel_execve+0x3f/0x50
4847bf08:  [<0805d122>] run_init_process+0x22/0x30
4847bf18:  [<0805d1e6>] init_post+0xb6/0x100
4847bf2c:  [<080487b1>] kernel_init+0x261/0x2d0
4847bf54:  [<08059a70>] tcp_congestion_default+0x0/0x20
4847bf98:  [<0833086f>] _spin_unlock_irq+0xf/0x20
4847bfa0:  [<0807d1ed>] finish_task_switch+0x3d/0x90
4847bfbc:  [<0806ee93>] run_kernel_thread+0x43/0x50
4847bfd8:  [<0806ee6f>] run_kernel_thread+0x1f/0x50
4847bfe4:  [<0805ec51>] new_thread_handler+0x61/0x90
4847bfe8:  [<08048550>] kernel_init+0x0/0x2d0

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