freebsd stable - Oct 2006 - ps locks up on 6.2-PRERELEASE SMP

Hi,

I ran the following two scripts simultaneously on 6.2-PRERELEASE SMP box
(cvsup'ed today).

----------------------------------------
#!/bin/sh

while true; do
        ls -lR / > ls_result.txt
done
----------------------------------------

----------------------------------------
#!/bin/sh

while true; do
        ls -lR / > ls_result2.txt
done
----------------------------------------

After a while (about 5 minutes), I suspended and killed the both, and
ran "ps".  As the result, "ps" locked up.  No response and
no output.
To make matters worse, I could not login anymore...

This is 100% reproducable on SMP, but no problem when using Non-SMP kernel.


-- 
Kazuaki ODA

On Fri, Oct 20, 2006 at 07:47:57AM +0900, Kazuaki ODA
wrote:
> Hi,
> 
> I ran the following two scripts simultaneously on 6.2-PRERELEASE SMP box
> (cvsup'ed today).
> 
> ----------------------------------------
> #!/bin/sh
> 
> while true; do
>         ls -lR / > ls_result.txt
> done
> ----------------------------------------
> 
> ----------------------------------------
> #!/bin/sh
> 
> while true; do
>         ls -lR / > ls_result2.txt
> done
> ----------------------------------------
> 
> After a while (about 5 minutes), I suspended and killed the both, and
> ran "ps".  As the result, "ps" locked up.  No response
and no output.
> To make matters worse, I could not login anymore...
> 
> This is 100% reproducable on SMP, but no problem when using Non-SMP kernel.
What state is ps in?  Press ^T.  It's probably a devfs lockup, which
should be fixed by changes yet to be merged.

Kris
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