Graphical console in stable/10 stuck on heavy writing

[Mark Martinec]

Adrian Chadd <adrian at freebsd.org> writes:
> I see this when the kernel is outputting debugging .. the console can
> quickly lock up exactly how you describe. I've never figured out why
> though. :(

Thanks for confirming.

I opened a PR misc/185156
  http://www.freebsd.org/cgi/query-pr.cgi?pr=185156

Mark

 
> On 22 December 2013 16:47, Mark Martinec wrote:
> > FreeBSD amd64, recent stable/10:
> > 
> > When running some task on a graphical console window
> > and that task writes lots of output to a console, the
> > console gets stuck after some time (like 20 minutes),
> > output stops, keyboard appears unresponsive, alt-ctrl-Fn
> > is unable to switch consoles - but the machine seems
> > otherwise sane: I can log in over ssh, file system and
> > processes are healthy, CPU not busy.
> > 
> > This was first noticed trying to rebuild kde from
> > ports in a console window. Same happened when bulk
> > updating packages from a remote site and the pkg update
> > was busily writing its output to a console.
> > 
> > The same heavy tasks (e.g. ports rebuild) can run
> > just fine in an ssh session, or in a konsole / xterm.
> > 
> > As a final proof, I tried a perl one-liner which
> > writes a line (a count and some text) ten times per
> > second: it manages to screw up the console window
> > in about 6 minutes.
> > 
> > Interestingly, while the console output is stuck
> > and I blindly type a command on a keyboard (no echo),
> > then run a shutdown from another (ssh) session,
> > the console output gets unstuck during shutdown,
> > rapidly displays the missing lines, including the
> > echo of a command typed blindly previously, along
> > with its output.
> > 
> > Btw, this never happened on this machine while it was
> > running 9.2 or older versions.
> > 
> > Anybody seen this or can reproduce it?
> >   Mark