[CentOS] System hangs silently

[Fong Vang]

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



On 1/20/06, Fong Vang <sudoyang at gmail.com> wrote:
> On 1/20/06, Rodrigo Barbosa <rodrigob at suespammers.org> 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 at suespammers.org>
> > "Quid quid Latine dictum sit, altum viditur"
> > "Be excellent to each other ..." - Bill & Ted (Wyld Stallyns)
> >
> > -----BEGIN PGP SIGNATURE-----
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> >
> > iD8DBQFD0Q2DpdyWzQ5b5ckRAri/AJ9DEDPlWNKrT9S7Yha4NImPVw+yaACeMQuO
> > /KnaeI7ZJbM4uFskZPe7vyA=
> > =OyJl
> > -----END PGP SIGNATURE-----
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