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Re: kern/57400

The following reply was made to PR kern/57400; it has been noted by GNATS.

From: David Daniels <>
To: gnat-bugs <>
Subject: Re: kern/57400
Date: Thu, 11 May 2023 20:15:32 +0100

 I have carried out some tests and it appears that this problem is
 linked in some way to my use of a KVM switch.
 I noticed that I kept getting the following messages coming out on
 the first console (ttyE0):
 wsmouse0: detached
 ums0: detached
 uhidev1: detached
 uhidev1 at uhub2 port3 (addr 6) disconnected
 uhidev1 at uhub2 port3 configuration 1 interface 0
 uhidev1: pixart... (details of USB mouse)
 ums0: at uhidev1: 3 button and Z dir
 wsmouse at ums0 mux0
 These were coming out roughly every 55 seconds. Just to see
 what happened I connected a keyboard and mouse directly to the
 Raspberry Pi and disconnected it from the KVM. As expected, these
 messages stopped coming out. **The important thing is that I also
 stopped getting the kernel panics.** Later I reconnected the Pi to
 the KVM and I started seeing the kernel panics again. I can
 reproduce them fairly readily by switching away from the Raspberry
 Pi to a different machine, waiting a few minutes and then
 switching back to the Pi and quitting from ctwm.
 I hope that helps. As I said, I think that my use of a KVM switch
 is linked to this problem. THE KVM, by the way, is a Rytaki
 Dave Daniels

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