Created attachment 422242 [details] output of emerge --info emerge -pv firefox [ebuild R ~] www-client/firefox-44.0_beta4::mozilla USE="dbus debug gstreamer hwaccel jemalloc3 jit minimal system-cairo system-icu system-jpeg system-libevent system-libvpx system-sqlite -bindist -custom-cflags -custom-optimization -egl -ffmpeg% -gmp-autoupdate -gstreamer-0 -gtk3 (-hardened) (-neon) (-pgo) -pulseaudio (-qt5) (-selinux) -startup-notification {-test} -wifi" 0 KiB
Created attachment 422244 [details] backtrace I tried to load html5test.com for testing. there is a warning a few lines before the crash happens JavaScript warning: https://html5test.com/scripts/6/engine.js, line 2962: Error: WebGL: Disallowing antialiased backbuffers due to blacklisting. to me the backtrace seems to be incomplete, as there are no helpfull lines from #50 to #24 and I don't know why. The missing informations for #1 to #3 are related to the fact that right now it is not possible to compile media-libs/mesa with debug useflag on musl.
The most common reason for incomplete backtraces are external libraries being called which have not been compiled with proper debugging flags. Looking at your emerge --info, I notice -O2 and -fomit-frame-pointer, both of which can interfere with debugging. My guess here is that firefox is calling something else (that doesn't have a debug use flag, for example). Quickly looking through, I notice that xserver and libxcb don't have said flags, not that it particularly matters. If you want to always be able to generate a meaningful backtrace in the future, having -Og and no -fomit-frame-pointer, as well as the nostrip FEATURE should probably help. Alternatively, what's suggested in https://wiki.gentoo.org/wiki/Debugging. As you pointed out with the depends, however, this does very much seem to be linked to libgl/mesa as per bug #571036).
Please do not cc myself or blueness to the bug report, I do not need 3 copies of the same bug in my inbox and blueness doesn't need 2 copies either.
I forgot to tell that I add feature="splitdebug" and replace fomit-frame-pointer with -ggdb via /etc/portage/env ================================================================= Package Settings ================================================================= www-client/firefox-44.0_beta4::mozilla was built with the following: USE="dbus debug gstreamer hwaccel jemalloc3 jit minimal system-cairo system-icu system-jpeg system-libevent system-libvpx system-sqlite -bindist -custom-cflags -custom-optimization -egl -gmp-autoupdate -gstreamer-0 -gtk3 (-hardened) (-neon) (-pgo) -pulseaudio (-selinux) -startup-notification -test -wifi" CFLAGS="-march=core2 -O2 -pipe -ggdb" CXXFLAGS="-march=core2 -O2 -pipe -ggdb" LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,-rpath=/usr/lib/firefox" I will try to compile with -Og though and see wether it makes a difference.
@tt_1: You said in bug 571036 that you have been able to compile mesa with debug symbols. Could you post the resulting more complete backtrace?
Created attachment 424806 [details] firefox backtrace with mesa debug symbols ================================================================= Package Settings ================================================================= www-client/firefox-45.0_beta2::mozilla was built with the following: USE="dbus debug gstreamer gtk3 hwaccel jemalloc3 jit system-cairo system-icu system-jpeg system-libevent system-libvpx system-sqlite -bindist -custom-cflags -custom-optimization -egl -ffmpeg -gmp-autoupdate -gstreamer-0 (-hardened) (-neon) (-pgo) -pulseaudio (-qt5) (-selinux) -startup-notification -test -wifi" CFLAGS="-march=core2 -Og -pipe -ggdb" CXXFLAGS="-march=core2 -Og -pipe -ggdb" LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,-rpath=/usr/lib/firefox" It is the same crash as before, just #24 till #52 are left empty in the backtrace and I don't understand why?
In addition to the backtrace there are a few warnings in the terminal. [2233] WARNING: Unable to locate an XBL binding for URI about:abp-elemhidehit?170495129147#dummy in document http://html5test.com/: file /var/tmp/portage/www-client/firefox-45.0_beta4/work/firefox-45.0b4/dom/xbl/nsXBLService.cpp, line 746 [2233] WARNING: Unable to locate an XBL binding for URI about:abp-elemhidehit?060298330707#dummy in document http://html5test.com/: file /var/tmp/portage/www-client/firefox-45.0_beta4/work/firefox-45.0b4/dom/xbl/nsXBLService.cpp, line 746 JavaScript warning: http://html5test.com/scripts/6/engine.js, line 2962: Error: WebGL: Disallowing antialiased backbuffers due to blacklisting. ATTENTION: default value of option force_s3tc_enable overridden by environment. should I try to disable hardware acceleration and test again? I tried to switch the ffmpeg and gstreamer useflags with no effect, the backtrace stays the same. ================================================================= Package Settings ================================================================= www-client/firefox-45.0_beta4::mozilla was built with the following: USE="dbus debug ffmpeg gtk3 hwaccel jemalloc3 jit system-libevent -bindist -custom-cflags -custom-optimization -egl -gmp-autoupdate -gstreamer -gstreamer-0 (-hardened) (-neon) (-pgo) -pulseaudio (-qt5) (-selinux) -startup-notification -system-cairo -system-icu -system-jpeg -system-libvpx -system-sqlite -test -wifi" CFLAGS="-march=core2 -Og -pipe -ggdb" CXXFLAGS="-march=core2 -Og -pipe -ggdb" LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,-rpath=/usr/lib/firefox"
the reason for the crash is the lack of glx_tls in musl. it can be avoided by disabling the nptl useflag of both mesa and xorg-server. the musl-extras overlay does have the appropiate ebuilds
So this bug should depend on bug 576928.
