[uml-devel] Getting garbage in ps, as expected...

[uml-devel] Getting garbage in ps, as expected...

[Rob Landley]

Great fun.  So I'm using UML in -skas0 mode built from 2.6.13.2, and it's 
putting fun garbage in the ps display:

 7284 ?        S      0:00 [pdflush]
10480 pts/3    R      0:06 ?@???            ?   ?   ?    ???s   F?! @???{
12783 ?        S      0:00 [pdflush]
 8454 pts/3    R      0:03  @???{        " ? ???

Also, sometimes when my script hits an error and init exits, and of course the 
thing panics and exits, it doesn't actually exit.  Instead it remains alive 
spinning and eating CPU.  "killall linux" makes it stop eating CPU, but that 
leaves T threads, and when you unblock them you get the above garbage (and 
_they_ start spinning eating CPU)...

No easy way to script a cleanup for this...

Rob



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Re: [uml-devel] Getting garbage in ps, as expected...

[Jeff Dike]

On Tue, Oct 11, 2005 at 10:52:51PM -0500, Rob Landley wrote:
> Great fun.  So I'm using UML in -skas0 mode built from 2.6.13.2, and it's 
> putting fun garbage in the ps display:
> 
>  7284 ?        S      0:00 [pdflush]
> 10480 pts/3    R      0:06 ?@???            ?   ?   ?    ???s   F?! @???{
> 12783 ?        S      0:00 [pdflush]
>  8454 pts/3    R      0:03  @???{        " ? ???

The garbage is irrelevant.

UML is supposed to clean up after itself.  How reproducable is this, and how
do you do it?

				Jeff


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Re: [uml-devel] Getting garbage in ps, as expected...

[Rob Landley]

On Thursday 13 October 2005 11:21, Jeff Dike wrote:
> On Tue, Oct 11, 2005 at 10:52:51PM -0500, Rob Landley wrote:
> > Great fun.  So I'm using UML in -skas0 mode built from 2.6.13.2, and it's
> > putting fun garbage in the ps display:
> >
> >  7284 ?        S      0:00 [pdflush]
> > 10480 pts/3    R      0:06 ?@???            ?   ?   ?    ???s   F?! @???{
> > 12783 ?        S      0:00 [pdflush]
> >  8454 pts/3    R      0:03  @???{        " ? ???
>
> The garbage is irrelevant.

But annoying.  It's corrupting the ps display and there's no way to killall 
those threads.

> UML is supposed to clean up after itself.  How reproducable is this, and
> how do you do it?

I normally run the build:
(cat /dev/zero | ./buildscript.sh > out.txt 2>&1 &) && tail -f out.txt

(Because the standard "tee" is buggy; it stops sending to a pipe if that pipe 
is ever full, which can happen due to the process it's feeding not getting 
scheduled fast enough.  This includes your xterm.  I fixed this in the 
busybox version...)

In the above, buildscript runs UML, which exits (with a panic) but doesn't 
_stop_.  Also "killall linux" will sometimes leave the garbage threads in T 
state, and when you -CONT them they turn into CPU hogs.

Rob


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