Firefox-83.0 crashes when being started (while trying to load libxul.so). Here is a backtrace: 0x00007ffff7de0d37 in elf_machine_runtime_setup (profile=0, lazy=1, l=0x7ffff6a5c000) at ../sysdeps/x86_64/dl-machine.h:132 132 *(ElfW(Addr)*)(D_PTR (l, l_info[ADDRIDX (DT_TLSDESC_GOT)]) + l->l_addr) (gdb) bt #0 0x00007ffff7de0d37 in elf_machine_runtime_setup (profile=0, lazy=1, l=0x7ffff6a5c000) at ../sysdeps/x86_64/dl-machine.h:132 #1 _dl_relocate_object (l=0x7ffff6a5c000, scope=0x7ffff6a5c368, reloc_mode=reloc_mode@entry=1, consider_profiling=consider_profiling@entry=0) at dl-reloc.c:274 #2 0x00007ffff7de7c0a in dl_open_worker (a=a@entry=0x7fffffffb700) at dl-open.c:700 #3 0x00007ffff6d72930 in __GI__dl_catch_exception (exception=0x7fffffffb6e0, operate=0x7ffff7de79c0 <dl_open_worker>, args=0x7fffffffb700) at dl-error-skeleton.c:208 #4 0x00007ffff7de75fa in _dl_open (file=0x7fffffffca10 "/usr/lib64/firefox/libxul.so", mode=-2147483391, caller_dlopen=0x555555570b74 <GetLibHandle(mozilla::pathstr_t)+29>, nsid=-2, argc=1, argv=0x7fffffffb6e0, env=0x7ffff6a1e200) at dl-open.c:864 #5 0x00007ffff79b2f78 in dlopen_doit (a=a@entry=0x7fffffffb930) at dlopen.c:66 #6 0x00007ffff6d72930 in __GI__dl_catch_exception (exception=exception@entry=0x7fffffffb8d0, operate=0x7ffff79b2f20 <dlopen_doit>, args=0x7fffffffb930) at dl-error-skeleton.c:208 #7 0x00007ffff6d729ef in __GI__dl_catch_error (objname=0x7ffff6a1c430, errstring=0x7ffff6a1c438, mallocedp=0x7ffff6a1c428, operate=<optimized out>, args=<optimized out>) at dl-error-skeleton.c:227 #8 0x00007ffff79b3785 in _dlerror_run (operate=operate@entry=0x7ffff79b2f20 <dlopen_doit>, args=args@entry=0x7fffffffb930) at dlerror.c:170 #9 0x00007ffff79b3004 in __dlopen (file=<optimized out>, mode=<optimized out>) at dlopen.c:87 #10 0x0000555555570b74 in GetLibHandle(mozilla::pathstr_t) (aDependentLib=0x7fffffffca10 "/usr/lib64/firefox/libxul.so") at /var/tmp/portage/www-client/firefox-83.0/work/firefox-83.0/xpcom/glue/standalone/nsXPCOMGlue.cpp:86 #11 0x0000555555570c70 in ReadDependentCB(mozilla::pathstr_t, mozilla::LibLoadingStrategy) (aDependentLib=0x7fffffffca10 "/usr/lib64/firefox/libxul.so", aLibLoadingStrategy=mozilla::LibLoadingStrategy::ReadAhead) at /var/tmp/portage/www-client/firefox-83.0/work/firefox-83.0/xpcom/glue/standalone/nsXPCOMGlue.cpp:136 #12 0x0000555555571005 in XPCOMGlueLoad(char const*, mozilla::LibLoadingStrategy) (aXPCOMFile=0x7ffff6a1c3e0 "/usr/lib64/firefox/libxul.so", aLibLoadingStrategy=mozilla::LibLoadingStrategy::ReadAhead) at /var/tmp/portage/www-client/firefox-83.0/work/firefox-83.0/xpcom/glue/standalone/nsXPCOMGlue.cpp:310 #13 0x00005555555711e0 in mozilla::GetBootstrap(char const*, mozilla::LibLoadingStrategy) (aXPCOMFile=0x7ffff6a1c200 "/usr/lib64/firefox/firefox", aLibLoadingStrategy=mozilla::LibLoadingStrategy::ReadAhead) at /var/tmp/portage/www-client/firefox-83.0/work/firefox-83.0/xpcom/glue/standalone/nsXPCOMGlue.cpp:390 #14 0x0000555555565236 in InitXPCOMGlue(mozilla::LibLoadingStrategy) (aLibLoadingStrategy=mozilla::LibLoadingStrategy::ReadAhead) at /var/tmp/portage/www-client/firefox-83.0/work/firefox-83.0/browser/app/nsBrowserApp.cpp:232 #15 0x0000555555565494 in main(int, char**, char**) (argc=1, argv=0x7fffffffdc58, envp=0x7fffffffdc68) at /var/tmp/portage/www-client/firefox-83.0/work/firefox-83.0/browser/app/nsBrowserApp.cpp:325 Portage 3.0.11 (python 3.7.9-final-0, default/linux/amd64/17.1/desktop, gcc-10.2.0, glibc-2.32-r3, 5.5.13-gentoo x86_64) ================================================================= System uname: Linux-5.5.13-gentoo-x86_64-Intel-R-_Core-TM-_i7-4770K_CPU_@_3.50GHz-with-gentoo-2.7 KiB Mem: 16288064 total, 2595644 free KiB Swap: 33554428 total, 30796504 free Timestamp of repository gentoo: Sun, 29 Nov 2020 09:30:01 +0000 Head commit of repository gentoo: b698bd73d424438f1b68535acef590f553e4892e Head commit of repository steam-overlay: 6ed5630096d43208168572264f204d40e6b2a5c0 sh bash 5.0_p18 ld GNU ld (Gentoo 2.30 p5) 2.30.0 app-shells/bash: 5.0_p18::gentoo dev-java/java-config: 2.3.1::gentoo dev-lang/perl: 5.30.3-r1::gentoo dev-lang/python: 3.6.10-r2::gentoo, 3.7.9::gentoo, 3.8.6::gentoo, 3.9.0::gentoo dev-util/cmake: 3.19.1::gentoo dev-util/pkgconfig: 0.29.2::gentoo sys-apps/baselayout: 2.7-r1::gentoo sys-apps/sandbox: 2.20::gentoo sys-devel/autoconf: 2.13-r1::gentoo, 2.69-r5::gentoo sys-devel/automake: 1.16.3-r1::gentoo sys-devel/binutils: 2.30-r4::gentoo, 2.31.1-r3::gentoo, 2.34-r2::gentoo, 2.35.1-r1::gentoo sys-devel/gcc: 9.3.0::gentoo, 10.2.0-r3::gentoo sys-devel/gcc-config: 2.3.2-r1::gentoo sys-devel/libtool: 2.4.6-r6::gentoo sys-devel/make: 4.3::gentoo sys-kernel/linux-headers: 5.9::gentoo (virtual/os-headers) sys-libs/glibc: 2.32-r3::gentoo Repositories: gentoo location: /usr/portage sync-type: rsync sync-uri: rsync://rsync.gentoo.org/gentoo-portage priority: -1000 sync-rsync-verify-max-age: 24 sync-rsync-extra-opts: sync-rsync-verify-metamanifest: yes sync-rsync-verify-jobs: 1 steam-overlay location: /usr/local/portage/steam-overlay sync-type: git sync-uri: https://github.com/anyc/steam-overlay.git masters: gentoo priority: 50 Installed sets: @steam ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="@FREE" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe -march=native -fomit-frame-pointer -mfpmath=sse -mtls-dialect=gnu2 -finline-functions-called-once" 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/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c" CXXFLAGS="-O2 -pipe -march=native -fomit-frame-pointer -mfpmath=sse -mtls-dialect=gnu2 -finline-functions-called-once" DISTDIR="/usr/portage/distfiles" 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="-O2 -pipe -march=native -fomit-frame-pointer -mfpmath=sse -mtls-dialect=gnu2 -finline-functions-called-once" FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync multilib-strict network-sandbox news 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="-O2 -pipe -march=native -fomit-frame-pointer -mfpmath=sse -mtls-dialect=gnu2 -finline-functions-called-once" GENTOO_MIRRORS="http://distfiles.gentoo.org" LANG="de_DE.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" LINGUAS="de en" MAKEOPTS="-j9" PKGDIR="/usr/portage/packages" 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 archive bash-completion berkdb binfilter bluetooth bluray branding bzip2 cairo cdda cddb cdr cli crypt cups dbus dri dts dvb dvd dvdr dvi eds emboss encode exif ffmpeg fftw firebird firefox flac fortran fuse g3dvl gdbm gif gimp glitz gnome gnome-keyring gnomecd gnutls gpm graphite gsm gstreamer gtk gtk2 gtk3 gtkstyle gui iconv icu idea ipv6 irda jingle jpeg jpeg2k jrtplib laptop lcms ldap libglvnd libnotify libtirpc lirc lzma mad man mmx mng mp3 mp4 mpeg multilib musepack nautilus ncurses nls nptl nptl-only nsplugin ntptl ogg opengl openmp pam pango pcmcia pcre pda pdf png policykit ppds pulseaudio qt5 readline sdl seccomp sensord smp sound speex spell split-usr sqlite sse sse2 sse3 sse4_1 ssl startup-notification svg systemd tcpd templates theora tiff truetype udev udisks unicode upower usb v4l v4l2 vcd vdpau vim-syntax vorbis vulkan wmf wxwidgets x264 xattr xcb xcomposite xinerama xml xpm xprint xulrunner xv xvid xvmc yahoo zlib" ABI_X86="64" ADA_TARGET="gnat_2018" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" 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="mmx mmxext sse sse2" 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" INPUT_DEVICES="evdev keyboard" KERNEL="linux" L10N="de en" 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_7" PYTHON_TARGETS="python2_7 python3_7" USERLAND="GNU" VIDEO_CARDS="intel amdgpu radeonsi" 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, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
You are probably on your own, I have no real idea. I would retry building with reduced CFLAGS, i.e. try without "-mtls-dialect=gnu2 -finline-functions-called-once".
I recompiled with the clang use flag. Now it works.
