I finally traced down the problem with pm-suspend not restoring the monitor state correctly on my amd64 system. It turns out vbetool is generating an illegal instruction when making a call into dev-libs/libx86: # vbetool vbestate get Illegal instruction Tracing through GDB, I discovered this is the faulty instruction: # gdb vbetool GNU gdb (Gentoo 7.8 vanilla) 7.8 Copyright (C) 2014 Free Software Foundation, Inc. [snip] Reading symbols from vbetool...Reading symbols from /usr/lib64/debug//usr/sbin/vbetool.debug...done. done. (gdb) set args vbestate get (gdb) run Starting program: /usr/sbin/vbetool vbestate get warning: Cannot call inferior functions, Linux kernel PaX protection forbids return to non-executable pages! warning: Could not load shared library symbols for linux-vdso.so.1. Do you need "set solib-search-path" or "set sysroot"? Program received signal SIGILL, Illegal instruction. 0x000003d4b1be54f7 in LRMI_init.part.0 () from /usr/lib64/libx86.so.1 (gdb) bt #0 0x000003d4b1be54f7 in LRMI_init.part.0 () from /usr/lib64/libx86.so.1 #1 0x000003d4b1be554d in LRMI_init () from /usr/lib64/libx86.so.1 #2 0x0000006e80c1ff93 in vbetool_init () at vbetool.c:42 #3 main (argc=3, argv=0x3e64eec3ef8) at vbetool.c:62 (gdb) disas Dump of assembler code for function LRMI_init.part.0: 0x000003d4b1be53e0 <+0>: push %rbp 0x000003d4b1be53e1 <+1>: mov %rsp,%rbp 0x000003d4b1be53e4 <+4>: push %rbx [snip] 0x000003d4b1be54e5 <+261>: mov $0x10000,%edx 0x000003d4b1be54ea <+266>: callq 0x3d4b1bcddb0 <memset@plt> 0x000003d4b1be54ef <+271>: movb $0x0,0x0 => 0x000003d4b1be54f7 <+279>: ud2 ---Type <return> to continue, or q <return> to quit--- End of assembler dump. LRMI_init.part.0 appears to actually be LRMI_call in the source code. Wikipedia says this about the 'ud2' instruction: "Generates an invalid opcode. This instruction is provided for software testing to explicitly generate an invalid opcode. The opcode for this instruction is reserved for this purpose." I stripped out all CFLAGS except for -O2 -pipe, removed LTO & Graphite optimizations, removed all LDFLAGS and ASFLAGS, and still vbetool would segfault with SIGILL. Switching the compiler to gcc-4.8.2 and rebuilding both vbetool and libx86 solves the problem. Likely, only libx86 needs to be rebuilt.
come on man, you know we need `emerge --info` attached for things like this ;)
(In reply to SpanKY from comment #1) > come on man, you know we need `emerge --info` attached for things like this > ;) Eh, I didn't think emerge --info would shed a lot of light on this one, but if you insist... Portage 2.2.13 (python 2.7.8-final-0, hardened/linux/amd64, gcc-4.9.1, glibc-2.19-r1, 3.16.1 x86_64) ================================================================= System uname: Linux-3.16.1-x86_64-Intel-R-_Core-TM-_i7_CPU_960_@_3.20GHz-with-gentoo-2.2 KiB Mem: 16491540 total, 14979012 free KiB Swap: 4209024 total, 4209024 free Timestamp of tree: Fri, 19 Sep 2014 05:30:01 +0000 ld GNU ld (Gentoo 2.24 p1.4) 2.24 distcc 3.1 x86_64-pc-linux-gnu [disabled] ccache version 3.1.9 [disabled] app-shells/bash: 4.2_p47 dev-java/java-config: 2.2.0 dev-lang/python: 2.7.8, 3.2.5-r6, 3.3.5-r1, 3.4.1 dev-util/ccache: 3.1.9-r3 dev-util/cmake: 3.0.2 dev-util/pkgconfig: 0.28-r2 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.13.1 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.13, 2.69 sys-devel/automake: 1.4_p6-r1, 1.5-r1, 1.8.5-r4, 1.9.6-r3, 1.10.3, 1.11.6, 1.12.6, 1.13.4, 1.14.1 sys-devel/binutils: 2.24-r3 sys-devel/gcc: 4.7.4, 4.8.3, 4.9.1 sys-devel/gcc-config: 1.8 sys-devel/libtool: 2.4.2-r1 sys-devel/make: 4.0-r1 sys-kernel/linux-headers: 3.16 (virtual/os-headers) sys-libs/glibc: 2.19-r1 Repositories: gentoo local ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -march=corei7 -mtune=corei7 -mfpmath=sse -msse -msse2 -mssse3 -msse4.1 -msse4.2 -mcx16 -msahf -mcrc32 -maccumulate-outgoing-args -fforce-addr -fmodulo-sched -fivopts -ftree-loop-im -ftree-loop-linear -ftree-loop-ivcanon -fgcse-after-reload -fgcse-lm -fgcse-sm -fgcse-las -floop-interchange -ftree-loop-distribution -floop-strip-mine -floop-block -ftree-vectorize -flto=8 -fuse-linker-plugin" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/init.d /etc/pam.d /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=corei7 -mtune=corei7 -mfpmath=sse -msse -msse2 -mssse3 -msse4.1 -msse4.2 -mcx16 -msahf -mcrc32 -maccumulate-outgoing-args -fforce-addr -fmodulo-sched -fivopts -ftree-loop-im -ftree-loop-linear -ftree-loop-ivcanon -fgcse-after-reload -fgcse-lm -fgcse-sm -fgcse-las -floop-interchange -ftree-loop-distribution -floop-strip-mine -floop-block -ftree-vectorize -flto=8 -fuse-linker-plugin" DISTDIR="/usr/portage/distfiles" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs candy cgroup config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms sign splitdebug unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org" INSTALL_MASK="/usr/lib/systemd /etc/systemd" LANG="en_US.iso885915" LDFLAGS="-O2 -march=corei7 -mtune=corei7 -mfpmath=sse -msse -msse2 -mssse3 -msse4.1 -msse4.2 -mcx16 -msahf -mcrc32 -maccumulate-outgoing-args -fforce-addr -fmodulo-sched -fivopts -ftree-loop-im -ftree-loop-linear -ftree-loop-ivcanon -fgcse-after-reload -fgcse-lm -fgcse-sm -fgcse-las -floop-interchange -ftree-loop-distribution -floop-strip-mine -floop-block -ftree-vectorize -flto=8 -fuse-linker-plugin -Wl,-z,now -Wl,-z,relro" MAKEOPTS="-j9" 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="/ramfs" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/portage/local" USE="amd64 apache2 berkdb bzip2 cli cracklib curl cxx dbus dri encode gd gdbm graphite hardened inotify ipv6 justify lto mmx modules multilib ncurses nptl nptlonly offensive openmp pam pax_kernel pcre pic readline real rtc session sqlite sse sse2 ssl tcpd unicode urandom xml xtpax zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="actions alias auth_basic auth_digest authn_anon authn_dbd 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 dbd deflate dir disk_cache env expires ext_filter file_cache filter headers ident imagemap include info log_config logio mem_cache mime mime_magic negotiation proxy proxy_ajp proxy_balancer proxy_connect proxy_http rewrite setenvif so 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="keyboard mouse 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="vesa vga fbdev" 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, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, SYNC, USE_PYTHON
pretty sure this is WAI. LRMI_init does: *((char *)0) = 0x4f; which is a NULL pointer deref and the C standard says you can assume undefined behavior (i.e. call ud2). if you add -fno-delete-null-pointer-checks to your CFLAGS, does it work ?
Thank you SpanKY that info helped me. I had similar problem with get-edid and indeed adding -fno-delete-null-pointer-checks to CFLAGS for libx86 solved the problem. I am using dev-libs/libx86-1.1-r3 and sys-devel/gcc-4.9.3 I have tried to switch the -fno-delete-null-pointer-checks flag on and off and running get-edid after each switch and it seems consistently work with the flag and without the flag it is giving an "Illegal instruction" and a syslog message "kernel: traps: get-edid[8356] trap invalid opcode ip:7fce60b51ef7 sp:7ffccf960850 error:0 in libx86.so.1[7fce60b4a000+1f000]"
(In reply to Jesper Saxtorph from comment #4) i've pushed this now then. hopefully it still works :). https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=f01eb1e0f70f1827c9bcde88b6db5ae4f1e4116a
