Bug 760738 – media-tv/v4l-utils segfault while opengl rendering

• Status: RESOLVED UPSTREAM
• Product: Gentoo Linux

[Description jorge 2020-12-19 15:26:05 UTC]

Created attachment 678817 [details]
GDB debug info

Whenever a video stream from a webcam is started for the second time using "Capture->Use OpenGL rendering", the application sigfaults. 

emerge --info v4l-utils
Portage 3.0.9 (python 3.8.6-final-0, default/linux/amd64/17.1/systemd, gcc-9.3.0, glibc-2.32-r2, 5.4.80-gentoo-r1 x86_64)
=================================================================
                         System Settings
=================================================================
System uname: Linux-5.4.80-gentoo-r1-x86_64-Intel-R-_Xeon-R-_CPU_E3-1285_v4_@_3.50GHz-with-glibc2.2.5
KiB Mem:    32735744 total,  28532436 free
KiB Swap:    8389628 total,   8389628 free
Timestamp of repository gentoo: Mon, 14 Dec 2020 06:30:01 +0000
Head commit of repository gentoo: 9c6b129b7d2c1048599e5710f287820bf71b76e8
sh bash 5.0_p18
ld GNU ld (Gentoo 2.34 p6) 2.34.0
ccache version 3.7.12 [enabled]
app-shells/bash:          5.0_p18::gentoo
dev-java/java-config:     2.3.1::gentoo
dev-lang/perl:            5.30.3::gentoo
dev-lang/python:          3.8.6::gentoo, 3.9.0::gentoo
dev-util/ccache:          3.7.12::gentoo
dev-util/cmake:           3.17.4-r1::gentoo
sys-apps/baselayout:      2.7::gentoo
sys-apps/sandbox:         2.20::gentoo
sys-devel/autoconf:       2.13-r1::gentoo, 2.69-r5::gentoo
sys-devel/automake:       1.16.2-r1::gentoo
sys-devel/binutils:       2.34-r2::gentoo
sys-devel/gcc:            9.3.0-r1::gentoo
sys-devel/gcc-config:     2.3.2-r1::gentoo
sys-devel/libtool:        2.4.6-r6::gentoo
sys-devel/make:           4.2.1-r4::gentoo
sys-kernel/linux-headers: 5.4-r1::gentoo (virtual/os-headers)
sys-libs/glibc:           2.32-r2::gentoo
Repositories:

gentoo
    location: /var/db/repos/gentoo
    sync-type: rsync
    sync-uri: rsync://rsync.gentoo.org/gentoo-portage
    priority: -1000
    sync-rsync-verify-max-age: 24
    sync-rsync-verify-metamanifest: yes
    sync-rsync-verify-jobs: 1
    sync-rsync-extra-opts: 

ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="@FREE"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=native -O3 -pipe -ggdb"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-march=native -O3 -pipe -ggdb"
DISTDIR="/var/cache/distfiles"
EMERGE_DEFAULT_OPTS=" --jobs=8 --load-average=7.8"
ENV_UNSET="CARGO_HOME DBUS_SESSION_BUS_ADDRESS DISPLAY GOBIN GOPATH PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR"
FCFLAGS="-march=native -O3 -pipe -ggdb"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs ccache config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync multilib-strict network-sandbox news nostrip parallel-fetch pid-sandbox preserve-libs protect-owned qa-unresolved-soname-deps sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-march=native -O3 -pipe -ggdb"
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LANG="en_US.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j8"
PKGDIR="/var/cache/binpkgs"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git"
PORTAGE_TMPDIR="/var/tmp"
USE="X a52 aac acl acpi alsa amd64 branding bzip2 caps cdda cli colord crypt cuda cups dbus djvu dri dts dvd dvdr encode eselect-ldso exif ffmpeg fftw flac fortran gdbm gif gmp gnome-keyring gnutls gphoto2 gpm gtk gtk3 gui iconv icu introspection ipv6 jack jpeg jpeg2k lcms libcaca libglvnd libnotify libressl libsamplerate libtirpc lto lzma lzo mad matroska mp3 mp4 mpeg multilib ncurses networkmanager nls nptl nss nvenc ogg opencl opengl openmp pam pcre pdf pgo png policykit postscript ppds pulseaudio quicktime raw readline sdl seccomp spell split-usr ssl startup-notification svg systemd tcpd teamd threads tiff truetype udev udisks unicode upower usb v4l vaapi vdpau vorbis wavpack x264 xattr xcb xfce xml xv xvid zip zlib" ABI_X86="64" ADA_TARGET="gnat_2018" ALSA_CARDS="hda_intel ca0132" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="karbon sheets words" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx avx2 f16c fma3 mmx mmxext pclmul popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 timing tsip tripmate tnt ublox ubx" GRUB_PLATFORMS="efi-64" INPUT_DEVICES="libinput" KERNEL="linux" L10N="en es la" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LUA_SINGLE_TARGET="lua5-1" LUA_TARGETS="lua5-1" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php7-2 php7-3 php7-4" POSTGRES_TARGETS="postgres10 postgres11" PYTHON_SINGLE_TARGET="python3_8" PYTHON_TARGETS="python2_7 python3_8" RUBY_TARGETS="ruby25 ruby26" USERLAND="GNU" VIDEO_CARDS="nvidia intel iris" 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:  CC, CPPFLAGS, CTARGET, CXX, INSTALL_MASK, LC_ALL, LINGUAS, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

=================================================================
                        Package Settings
=================================================================

media-tv/v4l-utils-1.16.6::gentoo was built with the following:
USE="bpf opengl qt5" ABI_X86="(64)"
CXXFLAGS="-march=native -O3 -pipe -ggdb -std=c++11"

[Comment 1 James Le Cuirot 2020-12-19 20:56:23 UTC]

Well it works fine for me but it's not clear exactly what you did. Please post precise steps.

Does it also happen without "Use OpenGL rendering" selected? I wonder if NVIDIA is to blame or perhaps it's the confusion with the Intel GPU as you appear to have both?

Please also try version 1.20.0. This will require the same version of libv4l.

Failing all that, you should take this upstream. It may also be a V4L kernel driver issue.

[Comment 2 jorge 2020-12-19 22:02:09 UTC]

Hello: yes, the error comes when OpenGL rendering is used and not otherwise. I installed (the "unstable") media-tv/v4l-utils-1.20.0 (which also pulled media-libs/libv4l-1.20.0) and the error is now gone...