Bug 390543 – media-gfx/sane-backends with USE="v4l" causes xsane and iscan to crash -with a floating point exception

• Status: RESOLVED UPSTREAM
• Product: Gentoo Linux

[Description Matthew Schultz 2011-11-14 16:38:02 UTC]

When sane-backends-1.0.22-r1 is build with USE="v4l", it causes the xsane and iscan frontends to crash on amd64 arch:

$ xsane
Floating point exception

$ iscan
Floating point exception

Crash in /var/log/messages:

Nov 14 10:21:50 localhost kernel: [11333.729935] m2m-testdev m2m-testdev.0: m2mtest_open: Created instance ffff880075905b00, m2m_ctx: ffff880075917800
Nov 14 10:21:50 localhost kernel: [11333.730114] iscan[4359] trap divide error ip:7fd71a14c92b sp:7fff9c7f1300 error:0 in libv4l1.so.0[7fd71a14b000+5000]
Nov 14 10:21:50 localhost kernel: [11333.731163] m2m-testdev m2m-testdev.0: m2mtest_release: Releasing instance ffff880075905b00

If sane-backends-1.0.22-r1 is built with USE="-v4l", iscan and xsane function normally.

Testbed:

Epson V500 Scanner

iscan-2.26.2
xsane-0.998
iscan-plugin-gt-x770 (from sunrise)
sane-backends-1.0.22-r1

emerge --info
Portage 2.1.10.11 (default/linux/amd64/10.0, gcc-4.5.3, glibc-2.12.2-r0, 3.1.0-gentoo x86_64)
=================================================================
System uname: Linux-3.1.0-gentoo-x86_64-Intel-R-_Core-TM-_i5-2540M_CPU_@_2.60GHz-with-gentoo-2.1
Timestamp of tree: Wed, 09 Nov 2011 21:00:01 +0000
app-shells/bash:          4.1_p9
dev-java/java-config:     2.1.11-r3
dev-lang/python:          2.7.2-r3, 3.1.4-r3
dev-util/cmake:           2.8.4-r1
dev-util/pkgconfig:       0.26
sys-apps/baselayout:      2.1
sys-apps/openrc:          0.9.4
sys-apps/sandbox:         2.4
sys-devel/autoconf:       2.13, 2.68
sys-devel/automake:       1.9.6-r3, 1.11.1
sys-devel/binutils:       2.21.1-r1
sys-devel/gcc:            4.5.3-r1
sys-devel/gcc-config:     1.4.1-r1
sys-devel/libtool:        2.4-r1
sys-devel/make:           3.82-r1
sys-kernel/linux-headers: 2.6.39 (virtual/os-headers)
sys-libs/glibc:           2.12.2
Repositories: gentoo sunrise Mythtv-Ebuilds x-portage
ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="*"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=core2 -O2 -pipe -fomit-frame-pointer"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /var/lib/hsqldb"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.2/ext-active/ /etc/php/apache2-php5.3/ext-active/ /etc/php/cgi-php5.2/ext-active/ /etc/php/cgi-php5.3/ext-active/ /etc/php/cli-php5.2/ext-active/ /etc/php/cli-php5.3/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-march=core2 -O2 -pipe -fomit-frame-pointer"
DISTDIR="/usr/portage/distfiles"
FEATURES="assume-digests binpkg-logs distlocks ebuild-locks fixlafiles fixpackages news parallel-fetch protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch"
FFLAGS=""
GENTOO_MIRRORS="http://portage.home http://gentoo.cites.uiuc.edu/pub/gentoo/ http://gentoo.mirrors.easynews.com/linux/gentoo/ http://mirror.phy.olemiss.edu/mirror/gentoo"
LANG="en_US.utf8"
LC_ALL="en_US.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
LINGUAS="en ru"
MAKEOPTS="-j6"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/var/lib/layman/sunrise /usr/local/mythtv_portage/Gentoo /usr/local/portage"
SYNC="rsync://server.home/gentoo-portage"
USE="X a52 aac acl acpi adns alsa amd64 apache2 audiofile avi bcmath bdf berkdb bluetooth bzip2 cairo calendar caps cdda cdr chardet cjk clamav cli consolekit cracklib crypt css ctype cups curl curlwrappers cxx dbus declarative device-mapper dga directfb dri dts dvb dvd dvdread emu-linux-x86 enca encode exif fbcon ffmpeg flac fontconfig foomaticdb fortran ftp fts3 gd gdbm gif gmp gnutls gpm gsm gtk gtk2 gzip hash hbci iconv idn ieee1394 imagemagick imap imlib innodb ipv6 ithreads java java6 javascript jpeg jpeg2k json kde kipi lcms libcaca libnotify lirc lm_sensors logrotate lzma lzo mad matroska mcal mhash mime mjpeg mmx mmxext mng modules mp3 mp4 mpeg mplayer msession mudflap multilib mysql mysqli mysqlnd mythtv ncurses network nls nptl nptlonly nsplugin nss nvidia offensive ofx ogg openal opengl openmp osc oss pam pcntl pcre pdf pdo pear perl pgo php png policykit posix ppds pppd python qt qt3 qt3support qt4 quicktime readline reflection rtc samba sasl sdl seamonkey semantic-desktop session simplexml soap sockets spell spl sql sqlite sse sse2 ssl ssse3 subversion suhosin svg sysfs syslog sysvipc tcpd theora threads thumbnail tidy tiff tokenizer transcode truetype udev unicode usb utempter v4l v4l2 vaapi vcd vdpau vorbis vpx wddx webkit wifi wxwindows x264 xcb xcomposite xforms xine xinerama xml xorg xpm xsl xv xvfb xvid xvmc zip zlib" ALSA_CARDS="hda-intel" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="actions alias auth_basic auth_digest authn_anon authn_dbd authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock dbd deflate dir disk_cache env expires ext_filter file_cache filter headers ident imagemap include info log_config logio mem_cache mime mime_magic negotiation proxy proxy_ajp proxy_balancer proxy_connect proxy_http rewrite setenvif so speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan stage tables krita karbon braindump" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ubx" INPUT_DEVICES="evdev keyboard mouse synaptics" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="en ru" PHP_TARGETS="php5-2 php5-3" QEMU_SOFTMMU_TARGETS="i386 x86_64" QEMU_USER_TARGETS="i386 x86_64" RUBY_TARGETS="ruby18" SANE_BACKENDS="epson epson2" USERLAND="GNU" VIDEO_CARDS="nvidia intel nv vesa fbdev v4l qxl virtualbox" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

[Comment 1 Patrick Kursawe (RETIRED) 2011-11-20 11:12:20 UTC]

Does the crash still happen if you disable v4l devices in /etc/sane.d/v4l.conf ?

[Comment 2 Patrick Kursawe (RETIRED) 2011-11-20 11:13:59 UTC]

One more question: How many video devices are present on your system?

[Comment 3 Matthew Schultz 2011-11-21 14:55:37 UTC]

(In reply to comment #1)
> Does the crash still happen if you disable v4l devices in /etc/sane.d/v4l.conf
> ?

It appears that I have two video devices on my system:

/dev/video0
/dev/video1

/dev/video0 uses m2m-testdev driver
/dev/video1 uses uvcvideo driver

I have a webcam built in to the laptop so that is /dev/video1.  It appears if I disable /dev/video0 in /etc/sane.d/v4l.conf, iscan and xsane don't crash anymore.  I'm not sure why I enabled m2m-testdev driver in the kernel.  I think I will disable that because I think it's some kind of v4l developer related driver.

[Comment 4 Patrick Kursawe (RETIRED) 2011-11-22 17:26:48 UTC]

Let me cite "man sane-v4l":

BUGS:
       If  more  than  one  video card is present, a crash may occur.

So I'll close this as "upstream".

[Comment 5 Matthew Schultz 2011-11-22 18:52:22 UTC]

(In reply to comment #4)
> Let me cite "man sane-v4l":
> 
> BUGS:
>        If  more  than  one  video card is present, a crash may occur.
> 
> So I'll close this as "upstream".

I'm not sure why it talks about video cards since v4l is about webcams and tv tuner cards and this issue was about a webcam and a test v4l device driver.

[Comment 6 Patrick Kursawe (RETIRED) 2011-11-22 19:55:12 UTC]

(In reply to comment #5)
> (In reply to comment #4)
> > Let me cite "man sane-v4l":
> > 
> > BUGS:
> >        If  more  than  one  video card is present, a crash may occur.
> > 
> > So I'll close this as "upstream".
> 
> I'm not sure why it talks about video cards since v4l is about webcams and tv
> tuner cards and this issue was about a webcam and a test v4l device driver.

I think it dates back to this:

      This is ALPHA software. Really! Important features are missing and there are  lots  of  bugs.  The
       code is currently only tested on a Linux 2.4 system with a Hauppauge WinTV video card.

The Hauppauge WinTV was some TV tuner card, and they call it a video card here.