[uml-devel] SKAS3: prerelease of V8 (against 2.6.9) uploaded

[uml-devel] SKAS3: prerelease of V8 (against 2.6.9) uploaded

[Blaisorblade]

Ok, I've uploaded the first prerelease of SKAS3 V8... It's uploaded on the 
web-site, you can start playing for it if you want:

http://www.user-mode-linux.org/~blaisorblade/patches/skas3-2.6/skas-2.6.9-v8-rc1/

if you want, impressions are welcome.... I've not yet tested it thoroughly, 
but it should work well enough.

I'm particularly interested in seeing it tested on SMP host systems, since 
I've added some locking and I want to be sure there is no deadlock 
possibility.

However, *not* on production systems for now... I want to check it more 
carefully.
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade


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Re: [uml-devel] SKAS3: prerelease of V8 (against 2.6.9) uploaded

[Doug Dumitru]

Blaisorblade wrote:
> Ok, I've uploaded the first prerelease of SKAS3 V8... It's uploaded on the 
> web-site, you can start playing for it if you want:
> 
> http://www.user-mode-linux.org/~blaisorblade/patches/skas3-2.6/skas-2.6.9-v8-rc1/
> 
> if you want, impressions are welcome.... I've not yet tested it thoroughly, 
> but it should work well enough.
> 
> I'm particularly interested in seeing it tested on SMP host systems, since 
> I've added some locking and I want to be sure there is no deadlock 
> possibility.
> 
> However, *not* on production systems for now... I want to check it more 
> carefully.

I just tested this release on a vanilla single-proc AMD system.  I see 
one major problem (at least with how we run UML here).

With 2.6.7 with skas3 and earlier releases it is possible to kill a 
virtual server from the host with a standard kill command.  All of the 
sub-threads die and you can unmount/unmap the various stuff that the 
virtual used.  This is an unclean shutdown but at least lets you kill 
virtuals that have misbehaved while leaving the host up.

With 2.6.9 skas3 v8 a plain kill does nothing.  With a kill -9, 3 of the 
four thread die, but one remains and the only way to get rid of it is 
with a server reboot.

Not sure what is going on here, but I have not been able to get anything 
past 2.6.7 to work while killing virtual rudely.

--------------------------------------------------------------------
Doug Dumitru     800-470-2756     (610-237-2000)
EasyCo LLC       doug@easyco.com  http://easyco.com
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Re: [uml-devel] SKAS3: prerelease of V8 (against 2.6.9) uploaded

[Frank Sorenson]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Doug Dumitru wrote:
<snip>
| With 2.6.9 skas3 v8 a plain kill does nothing.  With a kill -9, 3 of the
| four thread die, but one remains and the only way to get rid of it is
| with a server reboot.
|
| Not sure what is going on here, but I have not been able to get anything
| past 2.6.7 to work while killing virtual rudely.

Will they die if you send a "kill -CONT" followed by the "kill -9"?

Frank
- --
Frank Sorenson - KD7TZK
Systems Manager, Computer Science Department
Brigham Young University
frank@tuxrocks.com
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Re: [uml-devel] SKAS3: prerelease of V8 (against 2.6.9) uploaded

[Rob Landley]

On Tuesday 01 February 2005 01:47 am, Frank Sorenson wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Doug Dumitru wrote:
> <snip>
>
> | With 2.6.9 skas3 v8 a plain kill does nothing.  With a kill -9, 3 of the
> | four thread die, but one remains and the only way to get rid of it is
> | with a server reboot.
> |
> | Not sure what is going on here, but I have not been able to get anything
> | past 2.6.7 to work while killing virtual rudely.
>
> Will they die if you send a "kill -CONT" followed by the "kill -9"?
>
> Frank

If a kill -9 needs to be followed by a CONT signal to actually take effect on 
a stopped process, why is this not a kernel bug?  (Kill -9 is supposed to 
_mean_ it.  I've always thought of it as the "with shotgun" option...)

Rob


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Re: [uml-devel] SKAS3: prerelease of V8 (against 2.6.9) uploaded

[Frank Sorenson]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Rob Landley wrote:
| If a kill -9 needs to be followed by a CONT signal to actually take
effect on
| a stopped process, why is this not a kernel bug?  (Kill -9 is supposed to
| _mean_ it.  I've always thought of it as the "with shotgun" option...)
|
| Rob

I believe there were PTRACE changes in 2.6.9 that caused this:

http://marc.theaimsgroup.com/?l=linux-kernel&m=109877438509709&w=2

Frank
- --
Frank Sorenson - KD7TZK
Systems Manager, Computer Science Department
Brigham Young University
frank@tuxrocks.com
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Re: [uml-devel] SKAS3: prerelease of V8 (against 2.6.9) uploaded

[Christopher S. Aker]

With the problems we had with 2.6.9 as a host, I was wondering why Blaisorblade chose
it when he released skas-v8-rc1.

Here is skas-v8-rc1 diffed against 2.6.10:

http://www.theshore.net/~caker/patches/skas-v8-rc1-2.6.10.patch

-Chris



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Re: [uml-devel] SKAS3: prerelease of V8 (against 2.6.9) uploaded

[Doug Dumitru]

Christopher S. Aker wrote:
> With the problems we had with 2.6.9 as a host, I was wondering why Blaisorblade chose
> it when he released skas-v8-rc1.
> 
> Here is skas-v8-rc1 diffed against 2.6.10:
> 
> http://www.theshore.net/~caker/patches/skas-v8-rc1-2.6.10.patch
> 
> -Chris

Thank you for the patch.

It compiles cleanly and does run UML here, but still has the kill 
behaviour.  To recap:

   kill -TERM `pidof linux`

     does nothing

   kill -KILL `pidof linux`

     kills all but one thread, after which you can ...

   kill -CONT `pidof linux`

     which finally kills it off completely.

Having a kill -9 not work really sounds like a bug to me.  It can be 
worked around, but is "non obvious".

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Doug Dumitru     800-470-2756     (610-237-2000)
EasyCo LLC       doug@easyco.com  http://easyco.com
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Re: [uml-devel] SKAS3: prerelease of V8 (against 2.6.9) uploaded

[Blaisorblade]

On Tuesday 01 February 2005 17:27, you wrote:
> With the problems we had with 2.6.9 as a host, I was wondering why
> Blaisorblade chose it when he released skas-v8-rc1.

I wondered too :-), however the reason was just that I wanted to get it out 
for early review... I've then been busy and now I'm going to port it to 
2.6.10.

> Here is skas-v8-rc1 diffed against 2.6.10:

> http://www.theshore.net/~caker/patches/skas-v8-rc1-2.6.10.patch
I'm having a look at it, however IIRC there weren't too many subtle ptrace 
change in 2.6.10, so I guess you've done it well...

Actually I have some doubt about ptrace.c, for this part:

                  child->exit_code = data;
  -               /* make sure the single step bit is not set. */
  -               clear_singlestep(child);
  +               put_stack_long(child, EFL_OFFSET,tmp);
                  wake_up_process(child);
                  ret = 0;
                  break;

I understand the purpose, and it makes sense... but I'll have to find a way to 
clean it up... 
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade




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