User-mode Linux kernel port

Hi -

2008/5/29 J <jtane@...>:
> UML does not manage to start up and exits with the error:
>    Checking advanced syscall emulation patch for ptrace...check_ptrace
> : expected SIGTRAP or (SIGTRAP | 0x80), got status = 256
>
> I performed as said the following commands:
>
> $ wget -q http://uml.nagafix.co.uk/FedoraCore5/FedoraCore5-x86-root_fs.bz2
> $ wget -q http://user-mode-linux.sourceforge.net/linux-2.6.24-rc7.bz2
> $ bunzip2 FedoraCore5-x86-root_fs.bz2
> $ bunzip2 linux-2.6.24-rc7.bz2
> $ chmod +x linux-2.6.24-rc7.bz2
> $ ./linux-2.6.24-rc7 ubda=FedoraCore5-x86-root_fs mem=128M stderr=1
> 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...check_ptrace :
> expected SIGTRAP or (SIGTRAP | 0x80), got status = 256
>
> System:
> Linux localhost.localdomain 2.6.25.3-18.fc9.i686 #1 SMP Tue May 13
> 05:38:53 EDT 2008 i686 i686 i386 GNU/Linux
>
> $ rpm -q gcc
> gcc-4.3.0-8.i386
>
> $ rpm -q glibc
> glibc-2.8-3.i686
>
>
> I know I had tried it earlier (a certain number of months ago) but it
> did work... But it seems that it does not work

I am no expert, but would the following help?

http://marc.info/?l=user-mode-linux-user&m=121190115320955&w=2

David

On Thu, May 29, 2008 at 12:25:20PM +0200, J wrote:
> UML does not manage to start up and exits with the error:
>     Checking advanced syscall emulation patch for ptrace...check_ptrace
> : expected SIGTRAP or (SIGTRAP | 0x80), got status = 256

> System:
> Linux localhost.localdomain 2.6.25.3-18.fc9.i686 #1 SMP Tue May 13
> 05:38:53 EDT 2008 i686 i686 i386 GNU/Linux

Looks like Fedora broke ptrace again...

I'd complain to their bugzilla.

    	     	      Jeff

-- 
Work email - jdike at linux dot intel dot com

On Thu, May 29, 2008 at 09:09:24AM +0100, David Chanters wrote:
> With a root_fs image i've made, everything works and it will spawn
> three xterms just fine - one for syslog, and another two with gettys
> attached.  This is on my home system with a guest UML version 2.6.25.4
> and a host kernel with the same version (both using SKAS4).
> 
> With the same kernel versions for both on another machine, i can
> indeed boot from the same root_fs image but this time, three xterms
> are spawned with no gettys or syslog instead i just get my normal
> shell prompt.

A host shell prompt, I take it?

Do you have the uml-utilities installed on this host?

       	    	Jeff

-- 
Work email - jdike at linux dot intel dot com

Hello,
I just crashed and restored my machine, so I can do the test 
again only tomorrow or later.
I am 32 bits, but a quad cpu may be special:
 
Linux localhost 2.6.22.15.tex1 #1 SMP Sat Dec 15 13:15:05 CST 2007 i686
Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz GNU/Linux

Config:
#
# Automatically generated make config: don't edit
# Linux kernel version: 2.6.22.15.tex1
# Sat Dec 15 12:04:05 2007
#
CONFIG_X86_32=y
CONFIG_GENERIC_TIME=y
CONFIG_CLOCKSOURCE_WATCHDOG=y
CONFIG_GENERIC_CLOCKEVENTS=y
CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y
...
see attached file for the rest.




On Wed, 2008-05-28 at 11:37 -0400, Jeff Dike wrote:
> Is this a 32-bit UML on a 64-bit host?
> 
> On Sat, May 24, 2008 at 11:52:08AM +0200, vincent-perrier wrote:
> > Locating the top of the address space ... 0xffffd000
> 
> This suggests that it is...
> 
> > Detected host type: i386
> >  (GDT indexes 6 to 9)
> 
> This suggests that it isn't...
> 
> As for the siginfo stuff -
> 
> > 8497 0
> 
> > vcpu_data.siginfo._sifields._kill._pid,
> > vcpu_data.siginfo._sifields._kill._uid,
> 
> Makes some sort of sense as a pid and a uid.  Can you see if this is
> pid that makes sense?
> 
> 		Jeff
>

Not sure whether this applies to you, but ubd1/ubdb is generally
reserved for swap. I've lost ages trying to figure out why I couldn't
mount two filesystems (ubda, and ubdb).

Jay

2008/5/26 Jay Shah <jayshah31@...>:
> Not sure whether this applies to you, but ubd1/ubdb is generally
> reserved for swap. I've lost ages trying to figure out why I couldn't
> mount two filesystems (ubda, and ubdb).

Thank you - that's useful information which i've noted.  Can you give
an example of how you're doing things with ISOs then?

David.

Actually, I'm not. I've never really tried to to be honest, just
thought I'd give you the ubdb pointer :-) If no-one does reply, I'd
muck about with something on the lines of:

sudo ./linux ubda=/home/david/Slackware-11-root_fs
ubdc=/home/david/tmp/smgl-0.9.6.3-x86.iso mem=512

Then adding your root[fs] options.

Hopefully someone with some experience will be along shortly.

Jay

Also, have you tried something like:

http://www.finnix.org/Architectures#Finnix_for_User_Mode_Linux_.28UML.29

Remember not to use TT mode or anything ;-)

Jay

2008/5/26 David Chanters <david.chanters@...>:
> Ah -- your command worked in that it loaded the Slackware image, but
> not what's on the ISO -- my reasoning behind using the  Slackware
> rootfs was to give the ISO a "launchpad".  Not very logical I know.

Replying to myself, I downloaded a copy of the slackware 12.0 install
DVD iso and tried this:

sudo ./linux ubda=/home/david/slackware-12.0-install-dvd.iso mem=512MB

However this caused a segfault:

List of all partitions:
6200        341 ubda driver: uml-blkdev
No filesystem could mount root, tried:  reiserfs ext3 ext2
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)

EIP: 0073:[<b7fb2430>] CPU: 0 Not tainted ESP: 007b:bfccc4e0 EFLAGS: 00200246
    Not tainted
EAX: 00000000 EBX: 000063c7 ECX: 00000013 EDX: 000063c7
ESI: 000063c3 EDI: bfccc53c EBP: bfccc504 DS: 007b ES: 007b
27c5ae7c:  [<0806b1e8>] show_regs+0xb4/0xb9
27c5aea8:  [<08059cd7>] panic_exit+0x25/0x3b
27c5aebc:  [<08086132>] notifier_call_chain+0x21/0x46
27c5aedc:  [<080861cd>] __atomic_notifier_call_chain+0x17/0x19
27c5aef8:  [<080861e4>] atomic_notifier_call_chain+0x15/0x17
27c5af14:  [<08071e0e>] panic+0x52/0xd8
27c5af34:  [<08049a68>] mount_block_root+0xf8/0x10e
27c5af7c:  [<08049aca>] mount_root+0x4c/0x54
27c5afa0:  [<08049bce>] prepare_namespace+0xfc/0x123
27c5afa8:  [<08049796>] kernel_init+0x68/0x71
27c5afb4:  [<08065159>] run_kernel_thread+0x37/0x42
27c5afe0:  [<08057918>] new_thread_handler+0x57/0xad
27c5affc:  [<00000000>] 0x0

zsh: segmentation fault (core dumped)  sudo ./linux
ubda=/home/david/slackware-12.0-install-dvd.iso mem=512MB

I'm clearly misunderstanding something -- what is it?  :)

David

2008/5/26 David Chanters <david.chanters@...>:
> 2008/5/26 David Chanters <david.chanters@...>:
>> Ah -- your command worked in that it loaded the Slackware image, but
>> not what's on the ISO -- my reasoning behind using the  Slackware
>> rootfs was to give the ISO a "launchpad".  Not very logical I know.
>
> Replying to myself, I downloaded a copy of the slackware 12.0 install
> DVD iso and tried this:
>
> sudo ./linux ubda=/home/david/slackware-12.0-install-dvd.iso mem=512MB
Let's try as the following link explains:
http://lass.cs.umass.edu/~pjd/uml/

./linux ubd0=root_fs_slack12.0 ubd1=slackware-12.0-install.iso

It seems you mispelled the kernel command line.
Maybe you have first to create an empty root filesystem image where to
install your distribution.

Regards,

Flavio

>
> However this caused a segfault:
>
> List of all partitions:
> 6200        341 ubda driver: uml-blkdev
> No filesystem could mount root, tried:  reiserfs ext3 ext2
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)
>
> EIP: 0073:[<b7fb2430>] CPU: 0 Not tainted ESP: 007b:bfccc4e0 EFLAGS: 00200246
>    Not tainted
> EAX: 00000000 EBX: 000063c7 ECX: 00000013 EDX: 000063c7
> ESI: 000063c3 EDI: bfccc53c EBP: bfccc504 DS: 007b ES: 007b
> 27c5ae7c:  [<0806b1e8>] show_regs+0xb4/0xb9
> 27c5aea8:  [<08059cd7>] panic_exit+0x25/0x3b
> 27c5aebc:  [<08086132>] notifier_call_chain+0x21/0x46
> 27c5aedc:  [<080861cd>] __atomic_notifier_call_chain+0x17/0x19
> 27c5aef8:  [<080861e4>] atomic_notifier_call_chain+0x15/0x17
> 27c5af14:  [<08071e0e>] panic+0x52/0xd8
> 27c5af34:  [<08049a68>] mount_block_root+0xf8/0x10e
> 27c5af7c:  [<08049aca>] mount_root+0x4c/0x54
> 27c5afa0:  [<08049bce>] prepare_namespace+0xfc/0x123
> 27c5afa8:  [<08049796>] kernel_init+0x68/0x71
> 27c5afb4:  [<08065159>] run_kernel_thread+0x37/0x42
> 27c5afe0:  [<08057918>] new_thread_handler+0x57/0xad
> 27c5affc:  [<00000000>] 0x0
>
> zsh: segmentation fault (core dumped)  sudo ./linux
> ubda=/home/david/slackware-12.0-install-dvd.iso mem=512MB
>
> I'm clearly misunderstanding something -- what is it?  :)
>
> David
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
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> _______________________________________________
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> User-mode-linux-user@...
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>

David Chanters wrote:
> Hey all,
> 
> Thanks to Flavio's patience and kindness I'm pleased to say I have got
> UML up and running nicely, using a selection of rootfs from here:
> 
> http://uml.nagafix.co.uk/
> 
> Whilst that is fine, I was hoping there might be a way of replacing
> the rootfs with a .iso file?  For example i tried the following
> (naively) which fails:
> 
> sudo ./linux ubd0=/home/david/Slackware-11-root_fs
> ubd1=/home/david/tmp/smgl-0.9.6.3-x86.iso
> rootfs=/home/david/tmp/smgl-0.9.6.3-x86.iso root=/dev/ubda mem=512MB
> 
> Am i suffering from a misconceptioon that UML will ust blindly boot
> from an .ISO?  Am I even close with the command above?
> 
> Thanks in advance,
> 
> David

I have done this with an iso from Debian
The commandline was something like this:

./vmlinuz_2.6.24.3 devfs=nomount load_ramdisk=1 ramdisk_size=30000 
mem=128m initrd=initrd.gz root=/dev/ram0
ubd0=root_fs_test ubd1=debian-testing-i386-netinst.iso ubd2=/dev/cdrom 
eth0=tuntap,tap8

- I took the initrd.gz from the debian installer.
First download a netinstall iso of debian and mount it
mount -o loop /var/local/share/netinst.iso /mnt/debinst

We need the initrd.gz
cp /mnt/debinst/install/initrd.gz /var/local/uml
or
cp /mnt/debinst/install.i386/initrd.gz /var/local/uml

- root_fs_test is an empty file container.
- ubd1 is the iso that needs to be loaded.


In debian, this works, but you'll get an error in the installation 
process in regards to the CD drive.
It will say something like:
"No common CD-ROM drive was detected" -> answer No

Next you'll get: "Manually select a CD-ROM module and device" -> answer 
"Yes"

Choose none as cdrom and you'll get the chance to specify the device 
yourself.
Type this: /dev/ubdb



I image that for other distro's, it will be quite similar: search an 
initrd and specify load_ramdisk=1 ramdisk_size=30000 initrd=initrd.gz 
root=/dev/ram0.
Next ubd0 = root file system en ubd1 = iso

Regards,
Benedict

Hi --

2008/5/27 Benedict Verheyen <benedict.verheyen@...>:
> ./vmlinuz_2.6.24.3 devfs=nomount load_ramdisk=1 ramdisk_size=30000
> mem=128m initrd=initrd.gz root=/dev/ram0
> ubd0=root_fs_test ubd1=debian-testing-i386-netinst.iso ubd2=/dev/cdrom
> eth0=tuntap,tap8

Thanks for the hint.  i ran the following command:

sudo ~/linux-2.6.25/linux devfs=nomount load_ramdisk=1
ramdisk_size=30000 mem=128m initrd=initrd.gz root=/dev/ram0
ubd0=root_fs ubd1=/home/david/debian-40r3-i386-netinst.iso ubd2=/cdrom

It crashed.  See:

 ubda: unknown partition table
 ubdb: unknown partition table
List of all partitions:
0100      30000 ram0 (driver?)
0101      30000 ram1 (driver?)
0102      30000 ram2 (driver?)
0103      30000 ram3 (driver?)
0104      30000 ram4 (driver?)
0105      30000 ram5 (driver?)
0106      30000 ram6 (driver?)
0107      30000 ram7 (driver?)
0108      30000 ram8 (driver?)
0109      30000 ram9 (driver?)
010a      30000 ram10 (driver?)
010b      30000 ram11 (driver?)
010c      30000 ram12 (driver?)
010d      30000 ram13 (driver?)
010e      30000 ram14 (driver?)
010f      30000 ram15 (driver?)
6200     614400 ubda driver: uml-blkdev
6210     163392 ubdb driver: uml-blkdev
6220          2 ubdc driver: uml-blkdev
No filesystem could mount root, tried:  reiserfs ext3 ext2 iso9660 romfs fuseblk
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)

EIP: 0073:[<b8001430>] CPU: 0 Not tainted ESP: 007b:bff1d5f0 EFLAGS: 00200246
    Not tainted
EAX: 00000000 EBX: 00002e5c ECX: 00000013 EDX: 00002e5c
ESI: 00002e58 EDI: bff1d64c EBP: bff1d614 DS: 007b ES: 007b
0fc5ae7c:  [<0806e1f8>] show_regs+0xb4/0xb9
0fc5aea8:  [<0805ccd7>] panic_exit+0x25/0x3b
0fc5aebc:  [<08089142>] notifier_call_chain+0x21/0x46
0fc5aedc:  [<080891dd>] __atomic_notifier_call_chain+0x17/0x19
0fc5aef8:  [<080891f4>] atomic_notifier_call_chain+0x15/0x17
0fc5af14:  [<08074e1e>] panic+0x52/0xd8
0fc5af34:  [<08049a68>] mount_block_root+0xf8/0x10e
0fc5af7c:  [<08049b88>] mount_root+0x4c/0x54
0fc5afa0:  [<08049cbb>] prepare_namespace+0x12b/0x152
0fc5afa8:  [<08049796>] kernel_init+0x68/0x71
0fc5afb4:  [<08068161>] run_kernel_thread+0x37/0x42
0fc5afe0:  [<0805a918>] new_thread_handler+0x57/0xad
0fc5affc:  [<00000000>] 0x0

I created root_fs with the following commands:

dd if=/dev/zero of=root_fs bs=10M count=60
mkfs.ext3 ./root_fs

What am i doing wrong?

David

On Tue, May 27, 2008 at 07:58:26PM +0100, David Chanters wrote:
> sudo ~/linux-2.6.25/linux devfs=nomount load_ramdisk=1
> ramdisk_size=30000 mem=128m initrd=initrd.gz root=/dev/ram0
> ubd0=root_fs ubd1=/home/david/debian-40r3-i386-netinst.iso ubd2=/cdrom

BTW, most distro installers aren't too UML-friendly.  You'll need to
understand what the installer needs and how UML provides it in order
to make progress.
> No filesystem could mount root, tried:  reiserfs ext3 ext2 iso9660 romfs fuseblk
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(1,0)

Here, it appears that the UML kernel doesn't support whatever
filesystem is in the netinst.iso.

			Jeff

-- 
Work email - jdike at linux dot intel dot com

David Chanters wrote:
> Hi --
> 
> 2008/5/27 Benedict Verheyen <benedict.verheyen@...>:
>> ./vmlinuz_2.6.24.3 devfs=nomount load_ramdisk=1 ramdisk_size=30000
>> mem=128m initrd=initrd.gz root=/dev/ram0
>> ubd0=root_fs_test ubd1=debian-testing-i386-netinst.iso ubd2=/dev/cdrom
>> eth0=tuntap,tap8
> 
> Thanks for the hint.  i ran the following command:
> 
> sudo ~/linux-2.6.25/linux devfs=nomount load_ramdisk=1
> ramdisk_size=30000 mem=128m initrd=initrd.gz root=/dev/ram0
> ubd0=root_fs ubd1=/home/david/debian-40r3-i386-netinst.iso ubd2=/cdrom
> 
> It crashed.  See:
> 
>  ubda: unknown partition table
>  ubdb: unknown partition table
> List of all partitions:
> 0100      30000 ram0 (driver?)
> 0101      30000 ram1 (driver?)
> 0102      30000 ram2 (driver?)
> 0103      30000 ram3 (driver?)
> 0104      30000 ram4 (driver?)
> 0105      30000 ram5 (driver?)
> 0106      30000 ram6 (driver?)
> 0107      30000 ram7 (driver?)
> 0108      30000 ram8 (driver?)
> 0109      30000 ram9 (driver?)
> 010a      30000 ram10 (driver?)
> 010b      30000 ram11 (driver?)
> 010c      30000 ram12 (driver?)
> 010d      30000 ram13 (driver?)
> 010e      30000 ram14 (driver?)
> 010f      30000 ram15 (driver?)
> 6200     614400 ubda driver: uml-blkdev
> 6210     163392 ubdb driver: uml-blkdev
> 6220          2 ubdc driver: uml-blkdev
> No filesystem could mount root, tried:  reiserfs ext3 ext2 iso9660 romfs fuseblk
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)
> 
> EIP: 0073:[<b8001430>] CPU: 0 Not tainted ESP: 007b:bff1d5f0 EFLAGS: 00200246
>     Not tainted
> EAX: 00000000 EBX: 00002e5c ECX: 00000013 EDX: 00002e5c
> ESI: 00002e58 EDI: bff1d64c EBP: bff1d614 DS: 007b ES: 007b
> 0fc5ae7c:  [<0806e1f8>] show_regs+0xb4/0xb9
> 0fc5aea8:  [<0805ccd7>] panic_exit+0x25/0x3b
> 0fc5aebc:  [<08089142>] notifier_call_chain+0x21/0x46
> 0fc5aedc:  [<080891dd>] __atomic_notifier_call_chain+0x17/0x19
> 0fc5aef8:  [<080891f4>] atomic_notifier_call_chain+0x15/0x17
> 0fc5af14:  [<08074e1e>] panic+0x52/0xd8
> 0fc5af34:  [<08049a68>] mount_block_root+0xf8/0x10e
> 0fc5af7c:  [<08049b88>] mount_root+0x4c/0x54
> 0fc5afa0:  [<08049cbb>] prepare_namespace+0x12b/0x152
> 0fc5afa8:  [<08049796>] kernel_init+0x68/0x71
> 0fc5afb4:  [<08068161>] run_kernel_thread+0x37/0x42
> 0fc5afe0:  [<0805a918>] new_thread_handler+0x57/0xad
> 0fc5affc:  [<00000000>] 0x0
> 
> I created root_fs with the following commands:
> 
> dd if=/dev/zero of=root_fs bs=10M count=60
> mkfs.ext3 ./root_fs
> 
> What am i doing wrong?
> 
> David

As Jeff said, i think the filesystem in the root_fs isn't recognized.
It does seem as if the initrd is ok though.
Could you try with another iso?

Regards,
Benedict

Benedict Verheyen wrote:
> Benedict Verheyen wrote:
>> I retried with the same 2.6.25.4 kernel without the skas4 patch and it
>> works. Now i'm able to issue the stop and go commands.
>>
>> Next i will try with the skas4 patch enabled.
>>
>> Regards,
>> Benedict
> 
> I applied the skas4 patch and it still works although the UML now
> starts in skas0 mode.
> I will apply the patch to a 2.6.25.4 host kernel and then i suspect
> that it will run in skas 4 mode without problems.
> 
> I'll report back on it when i've tested.
> 
> Regards,
> Benedict

Hostkernel: 2.6.25.4 with skas 4 patch enabled
UML kernel: also 2.6.25.4 with skas 4 patch enabled

The stop & go now works without problems but the skas 4 isn't detected
or at least it doesn't say so when the uml starts. Might be logical as 
it says it's looking for the skas 3 patch :)
Excerpt:

Checking for the skas3 patch in the host:
   - /proc/mm...not found: No such file or directory
   - PTRACE_FAULTINFO...not found
   - PTRACE_LTD...not found
UML running in SKAS0 mode

Also, is there a way to log all that output to file? I have done it now 
by taking a screenshot and then typing the relevant lines.
I tried with enabling bootlog daemon but that fails to start.

Starting boot logger: bootlogdbootlogd: ioctl(/dev/pts/0, TIOCCONS): 
Device or resource busy
  failed!

Regards,
Benedict

Just to log the output:
 - Use 'screen', e.g.:

screen -L

[ new terminal ]

./linux ... etc.

Jay

On Tue, May 27, 2008 at 1:23 PM, Benedict Verheyen
<benedict.verheyen@...> wrote:
> Benedict Verheyen wrote:
>> Benedict Verheyen wrote:
>>> I retried with the same 2.6.25.4 kernel without the skas4 patch and it
>>> works. Now i'm able to issue the stop and go commands.
>>>
>>> Next i will try with the skas4 patch enabled.
>>>
>>> Regards,
>>> Benedict
>>
>> I applied the skas4 patch and it still works although the UML now
>> starts in skas0 mode.
>> I will apply the patch to a 2.6.25.4 host kernel and then i suspect
>> that it will run in skas 4 mode without problems.
>>
>> I'll report back on it when i've tested.
>>
>> Regards,
>> Benedict
>
> Hostkernel: 2.6.25.4 with skas 4 patch enabled
> UML kernel: also 2.6.25.4 with skas 4 patch enabled
>
> The stop & go now works without problems but the skas 4 isn't detected
> or at least it doesn't say so when the uml starts. Might be logical as
> it says it's looking for the skas 3 patch :)
> Excerpt:
>
> Checking for the skas3 patch in the host:
>   - /proc/mm...not found: No such file or directory
>   - PTRACE_FAULTINFO...not found
>   - PTRACE_LTD...not found
> UML running in SKAS0 mode
>
> Also, is there a way to log all that output to file? I have done it now
> by taking a screenshot and then typing the relevant lines.
> I tried with enabling bootlog daemon but that fails to start.
>
> Starting boot logger: bootlogdbootlogd: ioctl(/dev/pts/0, TIOCCONS):
> Device or resource busy
>  failed!
>
> Regards,
> Benedict
>
>
> -------------------------------------------------------------------------
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> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
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> User-mode-linux-user@...
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>

Jay Shah wrote:
> Just to log the output:
>  - Use 'screen', e.g.:
> 
> screen -L
> 
> [ new terminal ]
> 
> ./linux ... etc.
> 
> Jay

>> Also, is there a way to log all that output to file? I have done it now
>> by taking a screenshot and then typing the relevant lines.
>> I tried with enabling bootlog daemon but that fails to start.
>>
>> Starting boot logger: bootlogdbootlogd: ioctl(/dev/pts/0, TIOCCONS):
>> Device or resource busy
>>  failed!
>>

I start all my UML's with screen.
I then access them from putty but i can't seem to find all the startup 
info when i take over the uml with screen.
It doesn't seem to buffer enough?

Regards,
Benedict

On Tue, May 27, 2008 at 02:36:29PM +0200, Benedict Verheyen wrote:
> I start all my UML's with screen.
> I then access them from putty but i can't seem to find all the startup 
> info when i take over the uml with screen.
> It doesn't seem to buffer enough?

The output is in screenlog.n.

    	      	 Jeff

-- 
Work email - jdike at linux dot intel dot com

Jeff Dike wrote:
> On Tue, May 27, 2008 at 02:36:29PM +0200, Benedict Verheyen wrote:
>> I start all my UML's with screen.
>> I then access them from putty but i can't seem to find all the startup 
>> info when i take over the uml with screen.
>> It doesn't seem to buffer enough?
> 
> The output is in screenlog.n.
> 
>     	      	 Jeff

Thanks,

on a couple of UML's, i get this error:

wait_stub_done : failed to wait for SIGTRAP, pid = 10662, n = 10662, 
errno = 0, status = 0x1c7f
Stub registers -
         0 - 142c
         1 - 13
         2 - 142c
         3 - 1426
         4 - a
         5 - bff70b2c
         6 - 0
         7 - 7b
         8 - 7b
         9 - 0
         10 - 33
         11 - ffffffff
         12 - 1000a4
         13 - 73
         14 - 246
         15 - bff7081c
         16 - 7b

I can't do anything with that UML anymore.
Any ideas?

Regards,
Benedict

On Tue, May 27, 2008 at 03:31:06PM +0200, Benedict Verheyen wrote:
> on a couple of UML's, i get this error:
> 
> wait_stub_done : failed to wait for SIGTRAP, pid = 10662, n = 10662, 
> errno = 0, status = 0x1c7f
> Stub registers -
>          0 - 142c
>          1 - 13
>          2 - 142c
>          3 - 1426
>          4 - a
>          5 - bff70b2c
>          6 - 0
>          7 - 7b
>          8 - 7b
>          9 - 0
>          10 - 33
>          11 - ffffffff
>          12 - 1000a4
>          13 - 73
>          14 - 246
>          15 - bff7081c
>          16 - 7b
> 
> I can't do anything with that UML anymore.
> Any ideas?

Patch below...

			Jeff

-- 
Work email - jdike at linux dot intel dot com

Index: linux-2.6.22/arch/um/os-Linux/skas/process.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/skas/process.c	2008-04-14 10:44:33.000000000 -0400
+++ linux-2.6.22/arch/um/os-Linux/skas/process.c	2008-05-13 11:37:35.000000000 -0400
@@ -55,7 +55,7 @@ static int ptrace_dump_regs(int pid)
  * Signals that are OK to receive in the stub - we'll just continue it.
  * SIGWINCH will happen when UML is inside a detached screen.
  */
-#define STUB_SIG_MASK (1 << SIGVTALRM)
+#define STUB_SIG_MASK ((1 << SIGVTALRM) | (1 << SIGWINCH))
 
 /* Signals that the stub will finish with - anything else is an error */
 #define STUB_DONE_MASK (1 << SIGTRAP)