Date: Tue, 24 Dec 2013 13:41:31 GMT From: Mark Martinec <Mark.Martinec+freebsd@ijs.si> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/185156: Graphical console on 10-RC locks up on heavy writing Message-ID: <201312241341.rBODfVGK080896@oldred.freebsd.org> Resent-Message-ID: <201312241350.rBODo0xY002355@freefall.freebsd.org>
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>Number: 185156 >Category: misc >Synopsis: Graphical console on 10-RC locks up on heavy writing >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Dec 24 13:50:00 UTC 2013 >Closed-Date: >Last-Modified: >Originator: Mark Martinec >Release: stable/10 (= 10-RC2) >Organization: J. Stefan Institute >Environment: FreeBSD xxx.ijs.si 10.0-PRERELEASE FreeBSD 10.0-PRERELEASE #0 r259614: Thu Dec 19 18:45:02 CET 2013 mark@xxx.ijs.si:/usr/obj/usr/src/sys/SIESTA amd64 >Description: Copying a topic from the freebsd-stable ML: http://lists.freebsd.org/pipermail/freebsd-stable/2013-December/076571.html http://lists.freebsd.org/pipermail/freebsd-stable/2013-December/076573.html submitted here so as not to be forgotten: Mark Martinec wrote on 2013-12-23: 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. Adrian Chadd wrote on 2013-12-23: 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. :( >How-To-Repeat: On a console run any program that writes lots of output, e.g. the following perl one-liner: perl -e '@a=("a".."z","0".."9"); for (;;) { printf("%d %s %s\n", ++$n, join("",@a), scalar localtime); push(@a, shift @a); select(undef,undef,undef,0.1) }' >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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