Date: Tue, 17 Apr 2012 12:51:15 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: freebsd-stable@freebsd.org Subject: Re: top not restoring terminal echo/icanon correctly Message-ID: <20120417195115.GA60447@icarus.home.lan> In-Reply-To: <20120417182242.GA58449@icarus.home.lan> References: <20120417182242.GA58449@icarus.home.lan>
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On Tue, Apr 17, 2012 at 11:22:42AM -0700, Jeremy Chadwick wrote: > (Please keep me CC'd as I'm not subscribed to the list) > > I'd like to request that folks running RELENG_8 (and RELENG_9, though I > do not use it) please check the behaviour of their terminal after each > of following commands are run (check terminal after each command): > > top -a (press "q" after 1 screen refresh) > top -b > > If you find that your input characters in your shell aren't being echo'd > back after one of the above commands, blindly type "stty icanon echo" > and hit <Enter> and things should be back to normal. > > What I'm looking for is confirmation from others of the problem. > > Also very important: please provide uname -a output, specifically world > rebuild date. It greatly matters, because a commit was recently done > where now -b functions fine (was previously busted in this way), but now > -a behaves like -b did. So src/world date matters. > > All of this is documented in PR 161739. I urge anyone experiencing this > problem to read that PR in full, as I spent many hours today writing a > debug routine to confirm that top is sometimes not calling tcsetattr() > with the original terminal parameters when it exits, and what the > condition seems to be. > > http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/161739 > > Finally, if anyone want to tackle the problem (work out the logic bug > that is in there which causes it), please be my guest. I have other > things going on right now (doctors appointments) so I don't have as much > time as I'd like. > > Thanks everyone. Thanks to all those who have responded, including kib@. The problem is very odd and appears specific to the bash shell, but only "somewhat". Below is a part of what I sent kib@ on the matter. A chart showing what I've found: Location Username TERM Shell bug? ============================================================= VGA console root cons25 /bin/csh no VGA console jdc cons25 /usr/local/bin/bash no SSH (PuTTY) root xterm /bin/csh no SSH (PuTTY) jdc xterm /bin/csh no SSH (PuTTY) jdc xterm /usr/local/bin/bash yes ============================================================= In the last case (and only that case): if I move my dotfiles (.bashrc and .bash_profile) aside and log in (SSH), top behaves normally. Naturally this made me think "something is wonky with my dotfiles!"... But the problem *doesn't* happen if my dotfiles are intact and I log in via VGA console (cons25) as myself with a bash shell. So it's almost like there's some bizarre combination of things that causes this problem. I'll continue to try and narrow it down. -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, US | | Making life hard for others since 1977. PGP 4BD6C0CB |
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