The problem was is my /tmp mounted with noexec, this caused UML to 
sigfualt, I found a workaround for this, without remounting /tmp with 
exec, is that create /tmp2, and run linux kernel as below:

TMPDIR=/tmp2 ./linux *** Write your parameters here ***

Ali Almahdi wrote:

> I wasn't able to boot UML on my new server, I have tried most uml 
> patches and kernel versions with no success..
>
>
> # ./linux
> Checking for the skas3 patch in the host...found
> Checking for /proc/mm...found
> Linux version 2.6.8.1-1um (root@localhost) (gcc version 3.3.2 20031022 
> (Red Hat Linux 3.3.2-1)) #1 Fri Aug 27 10:02:17 AST 2004
> Built 1 zonelists
> Kernel command line: root=98:0
> PID hash table entries: 16 (order 4: 128 bytes)
> Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
> Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
> Memory: 27616k available
> Calibrating delay loop... 3971.48 BogoMIPS
> Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
> Checking for host processor cmov support...Yes
> Checking for host processor xmm support...No
> Checking that ptrace can change system call numbers...OK
> 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
> SCSI subsystem initialized
> mconsole (version 2) initialized on /root/.uml/u0qnZB/mconsole
> UML Watchdog Timer
> VFS: Disk quotas dquot_6.5.1
> Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
> Coda Kernel/Venus communications, v6.0.0, coda@cs.cmu.edu
> devfs: 2004-01-31 Richard Gooch (rgooch@atnf.csiro.au)
> devfs: boot_options: 0x0
> Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
> udf: registering filesystem
> Kernel panic: map_memory(0x42800000, 3, 0xce7000, 4096, 1, 1, 1) 
> failed, err = -1
>
> <6>SysRq : Show Regs
>
> EIP: 0073:[<4026c7a1>] CPU: 0 Not tainted ESP: 007b:4046cfa0 EFLAGS: 
> 00000216
>    Not tainted
> EAX: 00000000 EBX: 00007f09 ECX: 00000013 EDX: 00007f09
> ESI: 00000000 EDI: 00000000 EBP: 00000000 DS: 007b ES: 007b
> Call Trace: [<40165170>] [<4001a0aa>] [<4003cc66>] [<40030676>] 
> [<400306df>]
>   [<40014979>] [<4001eab4>] [<4001eafc>] [<40017823>] [<40019591>] 
> [<4026c827>]
>   [<40017883>] [<400198c4>] [<4026c7a1>] [<40019833>] [<4001ec10>] 
> [<4001ec29>]
>   [<400199b2>] [<4026c827>] [<4026c558>] [<40144800>] [<4026c827>] 
> [<4026c827>]
>   [<400179c8>] [<4026c827>] [<400179c8>] [<4026c827>] [<400179c8>] 
> [<400148cd>]
>   [<4005a97a>] [<4005aa31>] [<4005aa0f>] [<4005ab04>] [<4005aeee>] 
> [<4005af46>]
>   [<401447cd>] [<40049ffe>] [<40048ecc>] [<40007cc3>] [<40002604>] 
> [<4000f5a0>]
>   [<4000f5c7>] [<4000f5a0>] [<4001504d>] [<4000f5a0>] [<40015028>] 
> [<400178ca>]
>   [<4002d7d0>] [<4000f5a0>] [<4002d821>] [<4000f5a0>] [<4001e34a>] 
> [<4000f5a0>]
>   [<4026c558>] [<4026c7a1>]
> Segmentation fault (core dumped)
>
>
>
> My server is running on P4, 2GB RAM
>
> My UML config is attached.
>
> Thanks alot,
> Ali
>
>------------------------------------------------------------------------
>