gentoo-sources-3.12.21-r1 (which I installed on July 27th but is still marked stable on all arches as I type this) apparently has CONFIG_DEBUG_STACK_USAGE enabled by default (verified by immediately saving after make menuconfig, with no configuration changes), which causes scary warnings like: cryptomgr_test (35) used greatest stack depth: 6880 bytes left kworker/u12:6 (61) used greatest stack depth: 6728 bytes left kworker/u12:6 (60) used greatest stack depth: 6704 bytes left kwatchdog (71) used greatest stack depth: 6232 bytes left kbd_mode (73) used greatest stack depth: 5736 bytes left loadkeys (74) used greatest stack depth: 5096 bytes left init-early.sh (72) used greatest stack depth: 4448 bytes left emerge (1153) used greatest stack depth: 4296 bytes left kworker/0:1 (28) used greatest stack depth: 3952 bytes left to appear in the kernel log (dmesg). This feature should not be turned on by default in any of our kernels, since the message -- which upstream refuses to even consider modifying <https://bugzilla.kernel.org/show_bug.cgi?id=82191> -- really makes it look like there's something wrong with a user's system (to those who, like me, don't know any better).
Please post your `emerge --info =sys-kernel/gentoo-sources-3.12.21-r1' output in a comment.
Oops. Sorry... Portage 2.2.8-r1 (default/linux/amd64/13.0/desktop, gcc-4.7.3, glibc-2.19-r1, 3.12.21-gentoo-r1-ice x86_64) ================================================================= System Settings ================================================================= System uname: Linux-3.12.21-gentoo-r1-ice-x86_64-AMD_Athlon-tm-_II_X3_440_Processor-with-gentoo-2.2 KiB Mem: 3983940 total, 3688040 free KiB Swap: 4000180 total, 4000180 free Timestamp of tree: Mon, 18 Aug 2014 01:45:01 +0000 ld GNU ld (Gentoo 2.23.2 p1.0) 2.23.2 app-shells/bash: 4.2_p45 dev-lang/python: 2.7.7, 3.3.5-r1 dev-util/cmake: 2.8.12.2-r1 dev-util/pkgconfig: 0.28-r1 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.12.4 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.69 sys-devel/automake: 1.13.4 sys-devel/binutils: 2.23.2 sys-devel/gcc: 4.7.3-r1 sys-devel/gcc-config: 1.7.3 sys-devel/libtool: 2.4.2-r1 sys-devel/make: 3.82-r4 sys-kernel/linux-headers: 3.13 (virtual/os-headers) sys-libs/glibc: 2.19-r1 Repositories: gentoo ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=native -O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /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" CXXFLAGS="-march=native -O2 -pipe" DISTDIR="/usr/portage/distfiles" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://www.gtlib.gatech.edu/pub/gentoo http://lug.mtu.edu/gentoo/ http://gentoo.cs.uni.edu/" LANG="en_US.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j4" 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" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="" SYNC="rsync://rsync.us.gentoo.org/gentoo-portage" USE="3dnow 3dnowext X a52 aac acl acpi alsa amd64 berkdb bindist bluetooth branding bzip2 cairo cdda cdr cli consolekit cracklib crypt cups cxx dbus dri dts dvd dvdr emboss encode exif fam firefox flac fortran gdbm gif gpm gtk iconv ipv6 jpeg lcms ldap libnotify mad mmx mmxext mng modules mp3 mp4 mpeg multilib ncurses nls nptl ogg opengl openmp pam pango pcre pdf png policykit ppds qt3support qt4 readline sdl session spell sse sse2 sse3 ssl startup-notification svg tcpd tiff truetype udev udisks unicode upower usb vorbis wxwidgets x264 xcb xml xv xvid zlib" ABI_X86="64" ALSA_CARDS="ice1724" 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="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="en" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="nouveau" 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: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON ================================================================= Package Settings ================================================================= sys-kernel/gentoo-sources-3.12.21-r1 was built with the following: USE="-build -deblob -experimental -symlink" ABI_X86="64" CFLAGS="-march=k8 -O2 -pipe" CXXFLAGS="-march=k8 -O2 -pipe"
gentoo-sources doesn't set this - it's upstream.
So they were wrong when they told me to bring it to you guys? <https://bugzilla.kernel.org/show_bug.cgi?id=82191>
Nevermind. Apparently yes, they were wrong. I see the following using a freshly downloaded tar.xz for 3.12.27 (the latest stable version of 3.12) from kernel.org: # grep STACK arch/x86/configs/x86_64_defconfig CONFIG_DEBUG_STACK_USAGE=y CONFIG_DEBUG_STACKOVERFLOW=y It is my understanding that this means the option is enabled by default for that arch, and thus will be enabled when the user runs make menuconfig.
Yes, as Jer pointed out, these defaults come from upstream, from which we do not deviate.
Sorry for the followup here, but do you think I should continue pushing them (Kernel.org) on this? The commenters at <https://bugzilla.kernel.org/show_bug.cgi?id=82191> don't seem to think my bug report there is legitimate, and yet I don't see how the option would have gotten enabled in my config if not for upstream setting it. (They're saying that a user must specifically choose to enable it, but that does not reflect my experience. I'm saying that since it gets [or might get] enabled without the user's knowledge, the message should be modified to be more "user friendly".) Can I get a second (or third, I guess) opinion about this?
