linux-kernel - Re: SIGQUIT from tty layer

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Message-ID: <20090711145442.GA21222@ben-laptop>
Date:	Sat, 11 Jul 2009 10:54:42 -0400
From:	Ben Gamari <bgamari.foss@...il.com>
To:	xorg@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:	Samuel Thibault <samuel.thibault@...-lyon.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: SIGQUIT from tty layer

On Fri, Jul 10, 2009 at 08:33:46PM +0200, Samuel Thibault wrote:
> Not writing to the tty, but producing input for the tty.  Are you
> using evdev or the legacy kbd driver? 

evdev.

> 0x1c is the keycode of the enter key, maybe your workload happens to
> restart the keyboard driver, which temporarily re-enables signal keys.
What syscall would one use to do this? Perhaps I could systemtap this.

> 
> Or maybe it's on another tty, do you have anything beyond /dev/mem,
> /dev/null, /dev/tty7, /dev/agpgart and /dev/dri/card* in
> lsof -p $(pidof Xorg) | grep CHR
> ?

[1038 ben@...-laptop ~] $ sudo lsof -p $(pidof X)  | grep CHR
lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/ben/.gvfs
      Output information may be incomplete.
X       2787 root  mem    CHR              226,0                1191 /dev/dri/card0
X       2787 root    5w   CHR                4,7      0t0       1150 /dev/tty7
X       2787 root    8u   CHR              226,0      0t0       1191 /dev/dri/card0
X       2787 root   10u   CHR              13,66      0t0       1464 /dev/input/event2
X       2787 root   11u   CHR              13,67      0t0       1505 /dev/input/event3
X       2787 root   12u   CHR              13,65      0t0       1450 /dev/input/event1
X       2787 root   13u   CHR              13,68      0t0       1478 /dev/input/event4
X       2787 root   14u   CHR              13,69      0t0       1471 /dev/input/event5
X       2787 root   15u   CHR              13,72      0t0       4938 /dev/input/event8
X       2787 root   16u   CHR              13,71      0t0       4905 /dev/input/event7

So other than a bunch of event devices, not too much. Thanks for your
input,

- Ben

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