lkml.org 
[lkml]   [1996]   [Nov]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subjectgpm/serial bug?

I just spent too many hours figuring out that gpm was running and
shouldn't have been. I had a serial device attached to /dev/cua0
on a headless, sort of embedded, Linux PC. A short time after
starting the program that controls the device on the serial port
the the kernel would start thinking that bogus data was being typed
on the console. I was getting illegal character in name type messages
from getty. If I plugged in a monitor I could see the bogus data.
If I plugged in a keyboard I could inject correct key strokes in
amongst the bogus ones. If I shut down the controlling program and
the device then the problems stopped. If I let it keep running the
system would slowely die until it would do little more than respond
to pings on the network.

I experienced the problem with 2.0.14, 2.0.22 and 2.0.25.

Questions:

1) Does gpm do funny things that would make it suspect or does this
"have to" be a kernel problem?

2) Has anyone else seen anything like this before? I am accustomed
to having one program steal serial data from an other or
other messed up behavior like that, but I have neve before
seen messed up behavior from the kernel in a situation like
this before.

Getting rid of gpm and resetting the system cleared the problem. I suspect
something like gpm behaving badly when recieving data it doesn't understand.

Thanks,
Ty



\
 
 \ /
  Last update: 2005-03-22 13:38    [W:0.036 / U:0.252 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site