Problem : Since gentoo-sources-5.4.72, I am experiencing a couple of RX errors (overruns) on my network interface. (about half a dozen per 100K packets) I even, once, experienced a kernel trap. RX errors stick to Null when I go back to 5.4.66 or older (And 0 trap) Rx errors have always been 0 on my about 10 years old unchanged hardware from at least gentoo-sources-2.6.38 and as well with all following stable releases up to 5.4.66 included Hardware : 02:00.0 Ethernet controller: Qualcomm Atheros AR8121/AR8113/AR8114 Gigabit or Fast Ethernet (rev b0) Subsystem: ASUSTeK Computer Inc. AR8121/AR8113/AR8114 Gigabit or Fast Ethernet Kernel driver in use: ATL1E Possibly related particularity about my configuration of this subsystem : This ethernet controller is claimed being pci-msi capable and actually is. However, since linux 3.4 series, a patch has been fired disabling the pci-msi support for that family of devices : http://lkml.iu.edu/hypermail/linux/kernel/1304.0/01335.html Because I had never experienced any packet corruption before and even much more because when the pci-msi capability of that device is disabled, the ethernet controller falls back onto the same hardware interrupt than my sound card, I systematically revert that patch prior to building any new kernel release. Reproducible: Always Portage 3.0.9 (python 3.7.9-final-0, default/linux/amd64/17.1/no-multilib, gcc-9.3.0, glibc-2.32-r2, 5.4.66-0707a.0 x86_64) ================================================================= System uname: Linux-5.4.66-0707a.0-x86_64-Intel-R-_Core-TM-2_Duo_CPU_E8400_@_3.00GHz-with-gentoo-2.7 KiB Mem: 8166964 total, 4819480 free KiB Swap: 4194300 total, 4194300 free Timestamp of repository gentoo: Tue, 17 Nov 2020 08:00:01 +0000 Head commit of repository gentoo: d5fb2f328838c51abf685c6b036843eef179f109 sh bash 5.0_p18 ld GNU ld (Gentoo 2.34 p6) 2.34.0 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: 2.7.18-r4::gentoo, 3.7.9::gentoo, 3.8.6::gentoo, 3.9.0::gentoo dev-util/cmake: 3.17.4-r1::gentoo sys-apps/baselayout: 2.7::gentoo sys-apps/openrc: 0.42.1::gentoo sys-apps/sandbox: 2.20::gentoo sys-devel/autoconf: 2.13-r1::gentoo, 2.69-r5::gentoo sys-devel/automake: 1.13.4-r2::gentoo, 1.16.1-r1::gentoo sys-devel/binutils: 2.34-r2::gentoo sys-devel/gcc: 9.3.0-r1::gentoo sys-devel/gcc-config: 2.3.2::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-metamanifest: no sync-rsync-extra-opts: sync-rsync-verify-max-age: 24 sync-rsync-verify-jobs: 1 Tux location: /var/db/repos/Tux masters: gentoo ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="*" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=native -O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /usr/share/config /usr/share/gnupg/qualified.txt /usr/share/themes/oxygen-gtk/gtk-2.0" 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" CXXFLAGS="-march=native -O2 -pipe" DISTDIR="/var/cache/distfiles" EMERGE_DEFAULT_OPTS="--color y --alphabetical --autounmask=n" 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 -O2 -pipe" FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs config-protect-if-modified distlocks ebuild-locks fail-clean 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="-march=native -O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org/ " INSTALL_MASK="/usr/share/locale -/usr/share/locale/en -/usr/share/locale/en_GB -/usr/share/locale/en_US -/usr/share/locale/fr" LANG="fr_FR.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" LINGUAS="en fr" MAKEOPTS="-j2" 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"
you have a log with the errors?
Thank you Mike for, after so many years, still taking care of that package. I apologize for the noise and would consider fair to close this bug (INVALID / WORKSFORME... whatever suits you best), considering : A/ I made similar observations under vanilla-sources. (Overruns on ATL1E with > 5.4.66) B/ This bug is definitely one (my principal) workload dependent. I just cannot reproduce it under more "standard" network use. C/ Testing under an un-fiddled kernel (keeping pci-msi disabled for ATL1E) + problematic workload is just meaningless as, very logically, audio & ethernet devices sharing the same IRQ and therefore handled by the same core will lead to many more overruns than under the fiddled kernel (pci-msi for ATL1E handled by a different core than the one handling the audio device IRQ) D/ My suboptimal ethernet device does not support ethtool's commands for increasing the buffer size E/ Booting "mitigations=off", I am not running after whatever security patch and therefore, won't complain for having to stick with perfectly working 5.4.66. So please don't waste you time with this one, Mike, and take care.
