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From: Hans-Peter Jansen <hpj@urpla.net>
To: linux-kernel@vger.kernel.org
Cc: Arnd Hannemann <hannemann@i4.informatik.rwth-aachen.de>
Subject: Re: strange SysRq problem
Date: Thu, 14 Feb 2008 15:28:11 +0100	[thread overview]
Message-ID: <200802141528.11519.hpj@urpla.net> (raw)
In-Reply-To: <47B433C8.3030301@i4.informatik.rwth-aachen.de>

Am Donnerstag, 14. Februar 2008 schrieb Arnd Hannemann:
> Hans-Peter Jansen wrote:
> > I'm suffering from a strange SysRq problem:
> >
> > syslog shows haphazardly "SysRq : HELP" lines, while I definitely
> > didn't triggered them, neither via (PS/2) keyboard, nor via
> > /proc/sysrq-trigger. This is accompanied with stalls of about 15-60
> > secs.
>
> Any chance that a device connected via serial (or an USB device which
> uses USB/Serial conversion) triggers them? My cheap pl2303 device seems
> to send spurious BREAKs every once in a while, which results in the
> described behavior, as the kernel will print the help line for any
> character which is not a valid sysrq. (The probability to trigger another
> sysrq with random data is much lower, but did you find any other printout
> of an sysrq in your logs?)

Hmm, keyboard (Cherry G80-3000 LPCDE-2) and mouse (Logitech RX300) are 
connected via an equip KVM 2 port switch, but everything else is behaving 
properly, and no serial devices connected ATM. It only triggers the help 
messages, other sysrq messages are triggered at will (AFAIKS).

# grep "SysRq : HELP" /var/log/messages | wc -l
814

syslog starts at Jan 16, so you can imagine how disturbing this behavior is.

I cannot outrule some hardware defects. Will start to eliminate the KVM 
switch, but I thought, I ask here before since google also didn't revealed 
any hints..

Thanks,
Pete

      reply	other threads:[~2008-02-14 14:28 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-14  0:02 Hans-Peter Jansen
2008-02-14 12:27 ` Arnd Hannemann
2008-02-14 14:28   ` Hans-Peter Jansen [this message]

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