Question: Hey I'm having a problem with temacs segfaulting, but before going any further I feel yo should know that: misfit src # uname -a Linux misfit 2.6.28-hardened-r2 #1 SMP Fri Mar 13 17:44:57 PDT 2009 i686 AMD Athlon(TM) XP 2400+ AuthenticAMD GNU/Linux misfit src # this has been this way for quite awhile... I'm guessing it's a PIC issue? I don't know, I just wanna know why. misfit src # gdb temacs GNU gdb 6.8 Copyright (C) 2008 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i486-pc-linux-gnu"... (no debugging symbols found) SIGINT is used by the debugger. Are you sure you want to change it? (y or n) [answered Y; input not from terminal] Environment variable "DISPLAY" not defined. TERM = screen Breakpoint 1 at 0x80fa266 (gdb) disable 1 (gdb) run --batch --load loadup bootstrap Starting program: /var/tmp/portage/app-editors/emacs-23.1/work/emacs-23.1/src/temacs --batch --load loadup bootstrap (no debugging symbols found) Executing new program: /var/tmp/portage/app-editors/emacs-23.1/work/emacs-23.1/src/temacs (no debugging symbols found) (no debugging symbols found) Program received signal SIGSEGV, Segmentation fault. 0x080a1435 in Fdefine_charset_internal () (gdb) backtrace #0 0x080a1435 in Fdefine_charset_internal () #1 0x080a1d93 in define_charset_internal () #2 0x080a22c7 in syms_of_charset () #3 0x080dae9a in main () (gdb) Answer (from Ulrich) via e-mail: So it's on a hardened kernel. You could try the following: $ cat /proc/sys/kernel/randomize_va_space $ echo -n 0 >/proc/sys/kernel/randomize_va_space $ cat /proc/sys/kernel/randomize_va_space and if the second cat outputs "0" then build Emacs again. (And don't forget to reset to the original value when it's finished.) In any case, please open a bug report for this, so that we can properly track it. Reproducible: Always Steps to Reproduce: 1. emerge -uva world 2. running temacs with no arguments 3. running temacs with the following arguments: --batch --load loadup bootstrap Actual Results: Seg fault Expected Results: successful build testing solution now (see the answer in description.), I will follow up with the results when I get there.
The answer provided in the description didn't resolve the problem-- same problem. Also I forgot to mention the version: app-editors/emacs-23.1: misfit ~ # gcc --version gcc (Gentoo 4.3.4 p1.0, pie-10.1.5) 4.3.4 Copyright (C) 2008 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. misfit ~ #
Looking at the backtrace: The only thing that's in common with bug 221281 is that temacs segfaults in both cases. But in the other bug it's in Fdump_emacs, while here the crash happens earlier, namely in Fdefine_charset_internal. Therefore it's unlikely that it's the same problem. Please attach: - output of "emerge --info" - complete build.log
Created attachment 204793 [details] build.log output misfit temp # emerge --info Portage 2.1.6.13 (hardened/linux/x86/10.0, gcc-4.3.4, glibc-2.9_p20081201-r2, 2.6.28-hardened-r2 i686) ================================================================= System uname: Linux-2.6.28-hardened-r2-i686-AMD_Athlon-TM-_XP_2400+-with-gentoo-2.0.1 Timestamp of tree: Sun, 20 Sep 2009 16:00:01 +0000 app-shells/bash: 4.0_p33 dev-java/java-config: 2.1.9-r1 dev-lang/python: 2.4.6, 2.5.4-r3, 2.6.2-r1, 3.1.1 dev-python/pycrypto: 2.0.1-r8 dev-util/cmake: 2.6.4-r2 sys-apps/baselayout: 2.0.1 sys-apps/openrc: 0.4.3-r3 sys-apps/sandbox: 2.1 sys-devel/autoconf: 2.13, 2.63-r1 sys-devel/automake: 1.5, 1.7.9-r1, 1.9.6-r2, 1.10.2, 1.11 sys-devel/binutils: 2.19.1-r1 sys-devel/gcc-config: 1.4.1 sys-devel/libtool: 2.2.6a virtual/os-headers: 2.6.30-r1 ACCEPT_KEYWORDS="x86 ~x86" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1 emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 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Resolved, it seems the issue was that I was using -fstack-protector-all -- sorry paranoia is stupid. Since I upgraded to gcc 4 I wasn't comfortable assuming that it had ssp enabled by default-- though I have to admit this is the first time I've had trouble compiling with that flag. Sorry :)
(In reply to comment #4) > Resolved, it seems the issue was that I was using -fstack-protector-all -- > sorry paranoia is stupid. Since I upgraded to gcc 4 I wasn't comfortable > assuming that it had ssp enabled by default-- though I have to admit this is > the first time I've had trouble compiling with that flag. > Sorry :) also I edited the build log so if you're wondering why you don't see --fstack-protector-all in the cxxflags but in the ./configure that's because I forgot to edit the ./configure line and realized I can't take it back so I decided to try and build it anyway and sure enough like I'm eating my foot. I read the documentation for gcc 4 and it seems to me that it features ssp by design but -I just didn't trust it and I added -fstack-protector-all to my cxxflags. anyway, am I wrong or does that indicate a bug in the emacs code at all or is that a problem with gcc? I wish it were a more common practice for packages to reject cxxflags that are known to cause problems though I guess that's really more a matter of who has time to test stuff like that and who would anyway o_O
Reopening. A very similar issue was observed in bug 294479 comment #1. Build log and patch are attached to that bug.
I've added the following line to emacs-23.2-r2 (and 22.3-r6): filter-flags -fstack-protector -fstack-protector-all Please test.
Works for me now with emacs-23.2-r2. Do I understand correctly that this is a temporary workaround in the ebuild pending an upstream fix ?
(In reply to comment #8) > Works for me now with emacs-23.2-r2. Thank you for testing. > Do I understand correctly that this is a temporary workaround in the ebuild > pending an upstream fix ? Right. As soon as there is a release (emacs-23.3 is close to pretest) fixing upstream bug <http://debbugs.gnu.org/7186>, we shall remove the flag filtering again.
well, I would say that it isn't resolved really. I'm on a server that got recently switched from "default/linux/x86/10.0/server" to "hardened/linux/x86" I can't recompile emacs 22 or 23 (even 23.3) even after selecting the i686-pc-linux-gnu-4.4.5-vanilla as the gcc profile. I'm getting things like: make[2]: Entering directory `/var/tmp/portage/app-editors/emacs-23.3/work/emacs-23.3/lisp' make[2]: Entering directory `/var/tmp/portage/app-editors/emacs-23.3/work/emacs-23.3/lisp' Compiling /var/tmp/portage/app-editors/emacs-23.3/work/emacs-23.3/src/../lisp/buff-menu.el Compiling /var/tmp/portage/app-editors/emacs-23.3/work/emacs-23.3/src/../lisp/emacs-lisp/byte-run.el make[2]: *** [compile-onefile] Segmentation fault
