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Date:      Tue, 5 Jul 2005 21:03:45 -0400
From:      Kris Kennaway <kris@obsecurity.org>
To:        Skylar Thompson <skylar@cs.earlham.edu>
Cc:        fs@freebsd.org, Kris Kennaway <kris@obsecurity.org>
Subject:   Re: Snapshot problems
Message-ID:  <20050706010345.GA36075@xor.obsecurity.org>
In-Reply-To: <20050706005123.GA86915@quark.cs.earlham.edu>
References:  <20050701130315.C52686@duey.wolves.k12.mo.us> <42C6C873.8050808@cs.earlham.edu> <86k6k8yxf2.fsf@xps.des.no> <20050705175559.GA70037@quark.cs.earlham.edu> <20050705192932.GA46543@xor.obsecurity.org> <42CB26A2.5000300@cs.earlham.edu> <20050706003858.GA29780@xor.obsecurity.org> <20050706004410.GA86565@quark.cs.earlham.edu> <20050706004635.GA29934@xor.obsecurity.org> <20050706005123.GA86915@quark.cs.earlham.edu>

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On Tue, Jul 05, 2005 at 07:51:23PM -0500, Skylar Thompson wrote:
> On Tue, Jul 05, 2005 at 08:46:35PM -0400, Kris Kennaway wrote:
> > On Tue, Jul 05, 2005 at 07:44:10PM -0500, Skylar Thompson wrote:
> > > On Tue, Jul 05, 2005 at 08:38:58PM -0400, Kris Kennaway wrote:
> > > > On Tue, Jul 05, 2005 at 07:32:34PM -0500, Skylar Thompson wrote:
> > > > > Kris Kennaway wrote:
> > > > >=20
> > > > > >
> > > > > >When you break to DDB, what processes are running or blocked?
> > > > > >=20
> > > > > >
> > > > >=20
> > > > > Running:
> > > > > ypbind
> > > > > cron
> > > > > tail
> > > > > atalkd
> > > > > python (Mailman)
> > > > > cron
> > > > > httpd
> > > > > sshd
> > > > > rwhod
> > > > > ypserv
> > > > > syncer
> > > > >=20
> > > > > I don't see any processes in a blocked state, unless SLPQ or IWAI=
T or=20
> > > > > blocking states.
> > > >=20
> > > > Try 'show lockedvnods' and trace the listed processes.
> > >=20
> > > There's just one:
> > >=20
> > > Locked vnodes
> > > 0xc2383e70: tag ufs, type VREG, usecount 0, writecount 0, refcount 2,=
 flags
> > > (VVOBJBUF), lock type ufs: EXCL (count 1) by thread 0xc25b5180 (pid 5=
284)
> > > ino 23945, on dev aacd0s1a
> > >=20
> > > pid 5284 corresponds to a running cron process.
> >=20
> > And the trace?
>=20
> Sorry about that. Here it is:
>=20
> Tracing pid 5284 tid 100171 td 0xc25b5180
> sched switch(c0753480) at sched switch+0x143
> Xcpustop() at Xcpustop+0x41

Looks bogus :(

Kris

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