Re: test12 + initrd = swapper at 99.8% CPU time

Re: test12 + initrd = swapper at 99.8% CPU time

[Marcelo Tosatti]

On Wed, 13 Dec 2000, Joseph Cheek wrote:

> hi all,
> 
> i'm using test12 to perform a clean linux install.  as soon as i get to
> a command prompt, ps axufw shows swapper at 99.8% CPU usage.  this
> didn't repro with test11, and doesn't repro if i don't use an initrd.
> 
> my load avg stays above 1 even if nothing [a couple gettys and a shell]
> is running.
> 
> what can i do to debug this?  any ideas?

Boot with "profile=2" kernel option and read readprofile (1) man page to
know how to use it. 

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test12 + initrd = swapper at 99.8% CPU time

[Joseph Cheek]

hi all,

i'm using test12 to perform a clean linux install.  as soon as i get to
a command prompt, ps axufw shows swapper at 99.8% CPU usage.  this
didn't repro with test11, and doesn't repro if i don't use an initrd.

my load avg stays above 1 even if nothing [a couple gettys and a shell]
is running.

what can i do to debug this?  any ideas?

--
thanks!

joe

--
Joseph Cheek, Sr Linux Consultant, Linuxcare | http://www.linuxcare.com/
Linuxcare.  Support for the Revolution.      | joseph@linuxcare.com
CTO / Acting PM, Redmond Linux Project       | joseph@redmondlinux.org
425 990-1072 vox [1074 fax] 206 679-6838 pcs | joseph@cheek.com



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Re: test12 + initrd = swapper at 99.8% CPU time

[Russell King]

Joseph Cheek writes:
> i'm using test12 to perform a clean linux install.  as soon as i get to
> a command prompt, ps axufw shows swapper at 99.8% CPU usage.  this
> didn't repro with test11, and doesn't repro if i don't use an initrd.

What pid does this task have?  The only process that should be "swapper"
is pid0, and pid0 should be hidden from view.

If its not pid0, then I'd guess that it may be a rogue program...
   _____
  |_____| ------------------------------------------------- ---+---+-
  |   |         Russell King        rmk@arm.linux.org.uk      --- ---
  | | | | http://www.arm.linux.org.uk/personal/aboutme.html   /  /  |
  | +-+-+                                                     --- -+-
  /   |               THE developer of ARM Linux              |+| /|\
 /  | | |                                                     ---  |
    +-+-+ -------------------------------------------------  /\\\  |
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Re: test12 + initrd = swapper at 99.8% CPU time

[Joseph Cheek]

hi,

ps axufw shows it as pid 1.

Russell King wrote:

> Joseph Cheek writes:
> > i'm using test12 to perform a clean linux install.  as soon as i get to
> > a command prompt, ps axufw shows swapper at 99.8% CPU usage.  this
> > didn't repro with test11, and doesn't repro if i don't use an initrd.
>
> What pid does this task have?  The only process that should be "swapper"
> is pid0, and pid0 should be hidden from view.
>
> If its not pid0, then I'd guess that it may be a rogue program...
>    _____
>   |_____| ------------------------------------------------- ---+---+-
>   |   |         Russell King        rmk@arm.linux.org.uk      --- ---
>   | | | | http://www.arm.linux.org.uk/personal/aboutme.html   /  /  |
>   | +-+-+                                                     --- -+-
>   /   |               THE developer of ARM Linux              |+| /|\
>  /  | | |                                                     ---  |
>     +-+-+ -------------------------------------------------  /\\\  |

--
thanks!

joe

--
Joseph Cheek, Sr Linux Consultant, Linuxcare | http://www.linuxcare.com/
Linuxcare.  Support for the Revolution.      | joseph@linuxcare.com
CTO / Acting PM, Redmond Linux Project       | joseph@redmondlinux.org
425 990-1072 vox [1074 fax] 206 679-6838 pcs | joseph@cheek.com



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Re: test12 + initrd = swapper at 99.8% CPU timer

[Mike Galbraith]

On Thu, 14 Dec 2000, Joseph Cheek wrote:

> hi,
> 
> ps axufw shows it as pid 1.

Interesting.. init running out of control.  I've seen that, and it
was init taking endless page faults.

I wager (one virtual brew) that you'll see an endless stream of output
if you apply this.

--- kernel/signal.c.org	Fri Dec 15 03:36:59 2000
+++ kernel/signal.c	Fri Dec 15 03:39:36 2000
@@ -564,6 +564,9 @@
 {
 	unsigned long int flags;
 
+	if (sig == SIGSEGV)
+		printk(KERN_ERR "SIGSEGV pid %d\n", t->pid);
+
 	spin_lock_irqsave(&t->sigmask_lock, flags);
 	if (t->sig == NULL) {
 		spin_unlock_irqrestore(&t->sigmask_lock, flags);

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