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From: Arnd Hannemann <hannemann@i4.informatik.rwth-aachen.de>
To: Hans-Peter Jansen <hpj@urpla.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: strange SysRq problem
Date: Thu, 14 Feb 2008 13:27:52 +0100	[thread overview]
Message-ID: <47B433C8.3030301@i4.informatik.rwth-aachen.de> (raw)
In-Reply-To: <200802140102.14252.hpj@urpla.net>


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?)

Best regards,
Arnd Hannemann




  reply	other threads:[~2008-02-14 12:26 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 [this message]
2008-02-14 14:28   ` Hans-Peter Jansen

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