On 1/20/06, Fong Vang <sudoyang@xxxxxxxxx> wrote:
> We've narrowed this down to the serial port. Whenever we have
> anything plugged into the serial port, the system hangs. At the local
> login prompt, it hangs after entering the user name and hitting enter.
>
> USB keyboard still responds because you can still use ALT-Tab to
> switch to other virtual terminals.
>
> Again, nothing on screen. silent.
>
> This is reported by mgetty in the logs:
>
> 01/20 22:45:04 yS0 mgetty: experimental test release 1.1.31-Jul24
> 01/20 22:45:04 yS0 check for lockfiles
> 01/20 22:45:04 yS0 locking the line
> 01/20 22:45:35 yS0 WARNING: DCD line still active, check modem
> settings (AT&Dx)01/20 22:45:35 yS0 lowering DTR to reset Modem
> 01/20 22:45:36 yS0 waiting...
> 01/20 22:46:11 ##### failed dev=ttyS0, pid=5865, got signal 1, exiting
>
> 01/20 22:46:11 yS0 mgetty: experimental test release 1.1.31-Jul24
> 01/20 22:46:11 yS0 check for lockfiles
> 01/20 22:46:11 yS0 locking the line
> 01/20 22:47:13 yS0 WARNING: DCD line still active, check modem
> settings (AT&Dx)01/20 22:47:13 yS0 lowering DTR to reset Modem
> 01/20 22:47:13 ##### failed dev=ttyS0, pid=5898, got signal 15, exiting
All our CentOS 4.1 systems have this problem -- regardless of
hardware. Disabling mgetty allows us to use the systems after
plugging in the serial connection.
>
> On 1/20/06, Fong Vang <sudoyang@xxxxxxxxx> wrote:
> > On 1/20/06, Rodrigo Barbosa <rodrigob@xxxxxxxxxxxxxxx> wrote:
> > > -----BEGIN PGP SIGNED MESSAGE-----
> > > Hash: SHA1
> > >
> > > On Fri, Jan 20, 2006 at 08:38:09AM -0000, Plant, Dean wrote:
> > > > Rodrigo Barbosa wrote:
> > > > >>> Have you tried disabling hyperthreading? I had suffered this problem
> > > > >>> when we started buying Intel Xeon's, disabling HT'ing seemed to fix
> > > > >>> the problem for me.
> > > > >>
> > > > >> Some people suggested that too. I'm asking for two of these systems
> > > > >> to be sent back from our remote data center. I'll try it then.
> > > > >>
> > > > >> Did you just ended up running without hyperthreading? Did you ever
> > > > >> find a solution? It seems an awful waste if you can't use it.
> > > > >
> > > > > Disabling HT only solves it on single processor systems.
> > > >
> > > > In my case it fixed our dual processor systems (Dell PE2650) but to be
> > > > honest I was never quite sure if it was an OS patch or HT'ing. I just
> > > > disable HT'ing, build and they just work, I have not seen this problem
> > > > for a while now.
> > >
> > > Did't solve for me on a Dual Xeon. The problem was reduced, happens
> > > less frequently, but still happens :(
> >
> > I disabled hyperthreading... it is still hanging.
> >
> > > - --
> > > Rodrigo Barbosa <rodrigob@xxxxxxxxxxxxxxx>
> > > "Quid quid Latine dictum sit, altum viditur"
> > > "Be excellent to each other ..." - Bill & Ted (Wyld Stallyns)
> > >
> > > -----BEGIN PGP SIGNATURE-----
> > > Version: GnuPG v1.4.1 (GNU/Linux)
> > >
> > > iD8DBQFD0Q2DpdyWzQ5b5ckRAri/AJ9DEDPlWNKrT9S7Yha4NImPVw+yaACeMQuO
> > > /KnaeI7ZJbM4uFskZPe7vyA=
> > > =OyJl
> > > -----END PGP SIGNATURE-----
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> >
>
