[uml-user] Possible ways to execute

[Balaco B. <bal...@im...>]

A few weeks ago, after more struggling than I expected, I was abble to
run UML. I recompiled the linux kernel from source; I did not use the
root fs files available in the website, and found a Debian that seems to
suit my needs.

But yesterday I tried to execute it again, it did not work. The fact
that yesterday I tried it through SSH makes a difference?

Most of the command lines I had in my Bash history (long enough to have
almost everything I did in the previous session with this problem). None
of them worked. Most of them just seg fault in the beginning of
execution. Error related to root fs (surprise for me!). Just two of the
commands I tried did not seg fault immediatelly; but they also give no
output, and I had to start another SSH session, at the same time, to be
able to kill it (since ctrl+c and any other keyboard shortcuts) would be
"processed" my uml. I'm not sure what to do now.

This command line I executed right now:

./linux-2.6.24-x86_64 ubda=Debian-Wheezy-x86-root_fs  mem=128M 

Execute in the folder where the root fs file exists, gives ONLY this
output (almost immediatelly). It is through SSH. Is there a problem
here? I expected an user/password "screen" or anything similar.

The whole output I have for the above command, and I will let it waiting
for several minutes, is:

===========================================
Core dump limits :
	soft - 0
	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...nothing mounted on /dev/shm
Checking PROT_EXEC mmap in /tmp/...OK
Checking for new_mm and switch_mm support in the host:
	/proc/self/mm ... Failed - 
No such file or directory
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 29876224 bytes to physical memory to account for exec-shield gap
Linux version 2.6.24-g91525300-dirty (jd...@am...)
(gcc version 4.1.1 20070105 (Red Hat 4.1.1-51)) #1 Mon Jan 28 12:03:41
EST 2008
Built 1 zonelists in Zone order, mobility grouping on.  Total pages:
39515
Kernel command line: ubda=Debian-Wheezy-x86-root_fs mem=128M root=98:0
PID hash table entries: 1024 (order: 10, 8192 bytes)
Dentry cache hash table entries: 32768 (order: 6, 262144 bytes)
Inode-cache hash table entries: 16384 (order: 5, 131072 bytes)
Memory: 122164k available
Mount-cache hash table entries: 256
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
net_namespace: 120 bytes
Using 2.6 host AIO
NET: Registered protocol family 16
NET: Registered protocol family 2
Time: itimer clocksource has been installed.
IP route cache hash table entries: 2048 (order: 2, 16384 bytes)
TCP established hash table entries: 8192 (order: 5, 131072 bytes)
TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
TCP reno registered
Checking host MADV_REMOVE support...OK
mconsole (version 2) initialized on
/home/folder/path/.uml/1DZd7v/mconsole
((! the above line was manually changed for this message; and the
working folder is a subfolder in my home folder !))
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
TCP cubic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
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
kjournald starting.  Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
request_module: runaway loop modprobe binfmt-464c
request_module: runaway loop modprobe binfmt-464c
request_module: runaway loop modprobe binfmt-464c
request_module: runaway loop modprobe binfmt-464c
request_module: runaway loop modprobe binfmt-464c

===========================================

What do you suggest to try?

-- 
  Balaco


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