Package: firefox Version: 62.0.2-1 Followup-For: Bug #909818 Dear Maintainer,
I can confirm the CPU-eating problem with firefox. It might be related to the desktop environment. In my case I use XFCE and the CPU eating problem goes away if I kill xfsettingsd. stracing the "Web Conntent"-Process I see that firefox seems to do lots of sendmsg() with references to font related files, not sure if this maybe is related to fontconfig. --- SIGSYS {si_signo=SIGSYS, si_code=SYS_SECCOMP, si_errno=ENOTDIR, si_call_addr=0x7fc4874a1dbe, si_syscall=__NR_openat, si_arch=AUDIT_ARCH_X86_64} --- socketpair(AF_UNIX, SOCK_SEQPACKET, 0, [35, 37]) = 0 sendmsg(30, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", iov_len=16}, {iov_base="/usr/share/fonts/cmap/adobe-cns1"..., iov_len=51}, {iov_base=NULL, iov_len=0}], msg_iovlen=3, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[37]}], msg_controllen=24, msg_flags=0}, MSG_NOSIGNAL) = 67 close(37) = 0 recvmsg(35, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\354\377\377\377", iov_len=4}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 4 close(35) = 0 rt_sigreturn({mask=[]}) = -1 ENOTDIR (Not a directory) openat(AT_FDCWD, "/usr/share/fonts/cmap/adobe-cns1/resource.frk/Adobe-CNS1-6", O_RDONLY) = 257 --- SIGSYS {si_signo=SIGSYS, si_code=SYS_SECCOMP, si_errno=ENOTDIR, si_call_addr=0x7fc4874a1dbe, si_syscall=__NR_openat, si_arch=AUDIT_ARCH_X86_64} --- socketpair(AF_UNIX, SOCK_SEQPACKET, 0, [35, 37]) = 0 sendmsg(30, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", iov_len=16}, {iov_base="/usr/share/fonts/cmap/adobe-cns1"..., iov_len=59}, {iov_base=NULL, iov_len=0}], msg_iovlen=3, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[37]}], msg_controllen=24, msg_flags=0}, MSG_NOSIGNAL) = 75 close(37) = 0 recvmsg(35, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\376\377\377\377", iov_len=4}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 4 close(35) = 0 rt_sigreturn({mask=[]}) = -1 ENOENT (No such file or directory) openat(AT_FDCWD, "/usr/share/fonts/cmap/adobe-cns1/.resource/Adobe-CNS1-6", O_RDONLY) = 257 -- System Information: Debian Release: buster/sid APT prefers unstable APT policy: (500, 'unstable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.18.0-1-amd64 (SMP w/4 CPU cores) Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages firefox depends on: ii debianutils 4.8.6 ii fontconfig 2.13.1-1 ii libatk1.0-0 2.30.0-1 ii libc6 2.27-6 ii libcairo-gobject2 1.15.12-1 ii libcairo2 1.15.12-1 ii libdbus-1-3 1.12.10-1 ii libdbus-glib-1-2 0.110-3 ii libevent-2.1-6 2.1.8-stable-4 ii libffi6 3.2.1-8 ii libfontconfig1 2.13.1-1 ii libfreetype6 2.8.1-2 ii libgcc1 1:8.2.0-7 ii libgdk-pixbuf2.0-0 2.38.0+dfsg-6 ii libglib2.0-0 2.58.1-2 ii libgtk-3-0 3.24.1-2 ii libjsoncpp1 1.7.4-3 ii libnspr4 2:4.20-1 ii libnss3 2:3.39-1 ii libpango-1.0-0 1.42.4-3 ii libsqlite3-0 3.25.2-1 ii libstartup-notification0 0.12-5 ii libstdc++6 8.2.0-7 ii libvpx5 1.7.0-3 ii libx11-6 2:1.6.6-1 ii libx11-xcb1 2:1.6.6-1 ii libxcb-shm0 1.13-3 ii libxcb1 1.13-3 ii libxcomposite1 1:0.4.4-2 ii libxdamage1 1:1.1.4-3 ii libxext6 2:1.3.3-1+b2 ii libxfixes3 1:5.0.3-1 ii libxrender1 1:0.9.10-1 ii libxt6 1:1.1.5-1 ii procps 2:3.3.15-2 ii zlib1g 1:1.2.11.dfsg-1 Versions of packages firefox recommends: ii libavcodec57 7:3.4.3-1 ii libavcodec58 7:4.0.2-2+b1 Versions of packages firefox suggests: ii fonts-lmodern 2.004.5-5 ii fonts-stix [otf-stix] 1.1.1-4 ii libcanberra0 0.30-6 ii libgssapi-krb5-2 1.16-2 ii libgtk2.0-0 2.24.32-3 ii pulseaudio 12.2-2 -- debconf-show failed