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Date: Thu, 19 Oct 2006 18:52:56 -0400
From: Kris Kennaway <kris@obsecurity.org>
To: Kazuaki ODA <kaakun@highway.ne.jp>
Message-ID: <20061019225256.GA38237@xor.obsecurity.org>
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Cc: freebsd-stable@freebsd.org
Subject: Re: ps locks up on 6.2-PRERELEASE SMP
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On Fri, Oct 20, 2006 at 07:47:57AM +0900, Kazuaki ODA wrote:
> Hi,
>=20
> I ran the following two scripts simultaneously on 6.2-PRERELEASE SMP box
> (cvsup'ed today).
>=20
> ----------------------------------------
> #!/bin/sh
>=20
> while true; do
>         ls -lR / > ls_result.txt
> done
> ----------------------------------------
>=20
> ----------------------------------------
> #!/bin/sh
>=20
> while true; do
>         ls -lR / > ls_result2.txt
> done
> ----------------------------------------
>=20
> 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...
>=20
> This is 100% reproducable on SMP, but no problem when using Non-SMP kerne=
l.

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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