I noticed that calibre ebook reading module crashes when it is compiled with dev-python/PyQtWebEngine-5.14. According to https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=962811 bump to dev-python/PyQtWebEngine-5.15 should fix it. I couldn't test it though without upgrading whole Qt to 5.15 (bug 727948). I tried to downgrade calibre to stable version (4.9.1-r3), but it also crashes. Reproducible: Always Steps to Reproduce: 1. emerge calibre 2. ebook-viewer your_ebook.epub (same thing happens when trying to read ebook from calibre main app) Actual Results: Fatal Python error: PyEval_SaveThread: NULL tstate Current thread 0x00007f165dad06c0 (most recent call first): File "/usr/lib64/calibre/calibre/gui2/webengine.py", line 127 in _dispatch_messages File "/usr/lib64/calibre/calibre/gui2/viewer/main.py", line 230 in main File "/usr/lib64/calibre/calibre/gui_launch.py", line 81 in ebook_viewer File "/usr/lib64/calibre/calibre/utils/ipc/worker.py", line 209 in main File "/usr/bin/calibre-parallel", line 20 in <module> Portage 2.3.103 (python 3.7.8-final-0, default/linux/amd64/17.1/desktop, gcc-9.3.0, glibc-2.30-r8, 5.7.9-gentoo x86_64) ================================================================= System uname: Linux-5.7.9-gentoo-x86_64-AMD_Ryzen_5_3600_6-Core_Processor-with-gentoo-2.6 KiB Mem: 32912972 total, 20233092 free KiB Swap: 0 total, 0 free Timestamp of repository gentoo: Wed, 22 Jul 2020 11:05:21 +0000 Head commit of repository gentoo: 22418b92a5e088e945d4151942bd1c9fe927e92e Timestamp of repository kde: Tue, 21 Jul 2020 19:11:41 +0000 Head commit of repository kde: 6d7ad672c6e178c27c1b97cad0807f50d92ae70b Timestamp of repository steam-overlay: Sat, 04 Jul 2020 07:44:31 +0000 Head commit of repository steam-overlay: fcaa8ccf1c2149d9a61137d400e8ccdc82729dbc sh bash 5.0_p17 ld GNU ld (Gentoo 2.33.1 p2) 2.33.1 app-shells/bash: 5.0_p17::gentoo dev-lang/perl: 5.30.3::gentoo dev-lang/python: 2.7.18-r1::gentoo, 3.7.8-r2::gentoo, 3.8.4-r1::gentoo dev-util/cmake: 3.16.5::gentoo sys-apps/baselayout: 2.6-r1::gentoo sys-apps/openrc: 0.42.1::gentoo sys-apps/sandbox: 2.18::gentoo sys-devel/autoconf: 2.13-r1::gentoo, 2.69-r4::gentoo sys-devel/automake: 1.13.4-r2::gentoo, 1.16.1-r1::gentoo sys-devel/binutils: 2.33.1-r1::gentoo sys-devel/gcc: 6.5.0-r1::gentoo, 7.5.0::gentoo, 8.4.0::gentoo, 9.3.0-r1::gentoo, 10.1.0-r2::gentoo sys-devel/gcc-config: 2.3::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: 2.30-r8::gentoo Repositories: gentoo location: /var/db/repos/gentoo sync-type: git sync-uri: https://anongit.gentoo.org/git/repo/sync/gentoo.git priority: -1000 sync-git-verify-commit-signature: yes kde location: /var/db/repos/kde sync-type: git sync-uri: https://github.com/gentoo-mirror/kde.git masters: gentoo local location: /var/db/repos/local masters: gentoo steam-overlay location: /var/db/repos/steam-overlay sync-type: git sync-uri: https://github.com/gentoo-mirror/steam-overlay.git masters: gentoo ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="@FREE" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -march=native -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /usr/share/config /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="-O2 -march=native -pipe" DISTDIR="/var/cache/distfiles" EMERGE_DEFAULT_OPTS="--quiet-build=n --jobs=20 --load-average=14 --keep-going" ENV_UNSET="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 -march=native -pipe" FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs cgroup 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" FFLAGS="-O2 -march=native -pipe" GENTOO_MIRRORS="http://ftp-stud.hs-esslingen.de/pub/Mirrors/gentoo/ http://ftp.snt.utwente.nl/pub/os/linux/gentoo http://mirror.leaseweb.com/gentoo/" INSTALL_MASK="/usr/share/locale -/usr/share/locale/pl* -/usr/share/locale/en /usr/share/binutils-data/*/*/locale -/usr/share/binutils-data/*/*/locale/pl* -/usr/share/binutils-data/*/*/locale/en /usr/share/gcc-data/*/*/locale -/usr/share/gcc-data/*/*/locale/pl* -/usr/share/gcc-data/*/*/locale/en /usr/share/man/ -/usr/share/man/man* -/usr/share/man/pl* -/usr/share/man/whatis" LANG="en_US.utf8" LDFLAGS="-Wl,-O1 -Wl,--sort-common -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 acoustid acpi alsa amd64 bash-completion berkdb branding brotli bzip2 cairo cdda cdr cli consolekit cups dbus dri dts dvd dvdr emboss encode exif flac fortran gdbm gif gimp gpm gpu gtk gtk3 http2 iconv icu jpeg lcms libnotify libtirpc lto mad mng mobi mp3 mp4 mpeg mtp multilib musepack musicbrainz ncurses nls nptl offensive ogg opencl opengl openmp opus pam pango pcre pdf pgo png policykit postscript ppds qt5 readline sane scanner sdl seccomp spell split-usr ssl startup-notification svg system-cairo system-harfbuzz system-icu system-jpeg system-jsoncpp system-libevent system-libvpx system-llvm system-sqlite tcpd tiff truetype udev udisks unicode upower usb userlocales vdpau vorbis vulkan webp wxwidgets x264 x265 xcb xml xmp xv xvid zlib" ABI_X86="64" ADA_TARGET="gnat_2018" ALSA_CARDS="intel8x0 emu10k1 virtuoso" 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" CAMERAS="canon" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx avx2 f16c fma3 mmx mmxext pclmul popcnt rdrand sha sse sse2 sse3 sse4_1 sse4_2 sse4a 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" INPUT_DEVICES="libinput" KERNEL="linux" LCD_DEVICES="hd44780 curses text rawserial serialpos serialvfd" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LIRC_DEVICES="serial" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php7-2 php7-3" POSTGRES_TARGETS="postgres10 postgres11" PYTHON_SINGLE_TARGET="python3_7" PYTHON_TARGETS="python2_7 python3_7" RUBY_TARGETS="ruby25" SANE_BACKENDS="pixma" USERLAND="GNU" VIDEO_CARDS="amdgpu radeonsi radeon" 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, LC_ALL, LINGUAS, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
I still have PyQtWebEngine-5.13.2 here, and I haven't seen ebook-viewer crash with that.
I now updated to dev-python/PyQtWebEngine-5.15.1_pre2006110847 and calibre still crashes. Maybe the Debian bug was pointing in the wrong direction. I downgraded all Python packages that I had for some reason in unstable versions and the problem disappeared. I don't know which particular one was responsible, maybe dev-python/PyQt5-sip.
