[Issue 5278] DMD generates programs that immediately segfault.
http://d.puremagic.com/issues/show_bug.cgi?id=5278 --- Comment #13 from Chad Joan chadj...@gmail.com 2011-09-19 23:26:19 PDT --- I have taken another crack at this. After some compiling of D on a roommate's non-hardened Gentoo system I found that if I recompile my gcc without the hardened useflag and then compile my D programs, the D programs won't segfault. This round of testing was done with 64-bit DMD. In short: using hardened GCC will trigger this. I was pointed in this direction by observing the last line of the output of compiling with dmd -v: gcc main.o -o main -m64 -Xlinker -L/usr/local/share/dcompilers/dmd/linux/bin64/../lib64 -Xlinker -L/usr/local/share/dcompilers/dmd/linux/bin64/../lib32 -Xlinker --no-warn-search-mismatch -Xlinker --export-dynamic -lrt -lphobos2 -lpthread -lm Notably, it is using gcc for its linking step. After a bit of browsing in the DMD sources, a workaround presents itself. DMD just uses the CC environment variable to determine what to use for linking, so it is possible to build an isolated non-hardened GCC and then use that to compile D programs. It would look like this: CC=custom-gcc dmd -v main.d -ofmain At some point I may bisect the older changes in DMD to find out where this regression was introduced. I can see this ending up in the backend though, so I'm not sure I'll be able to understand the code I end up in. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email --- You are receiving this mail because: ---
[Issue 5278] DMD generates programs that immediately segfault.
http://d.puremagic.com/issues/show_bug.cgi?id=5278 --- Comment #14 from Chad Joan chadj...@gmail.com 2011-09-19 23:28:48 PDT --- (In reply to comment #12) I just thought I'd mention that I had some similar problems with DMD on Gentoo due to bad permissions of certain libraries. Do your programs run under root? If so, check permissions for libphobos and whatever 32-bit libraries your program / libphobos uses (glibc? libstdc++?). I almost forgot to mention this... My programs still segfault under root. Permissions are fine. Everything works if I use a non-hardened GCC. Thanks for the suggestions! -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email --- You are receiving this mail because: ---
[Issue 5278] DMD generates programs that immediately segfault.
http://d.puremagic.com/issues/show_bug.cgi?id=5278 Vladimir thecybersha...@gmail.com changed: What|Removed |Added CC||thecybersha...@gmail.com --- Comment #12 from Vladimir thecybersha...@gmail.com 2011-02-20 15:27:04 PST --- I just thought I'd mention that I had some similar problems with DMD on Gentoo due to bad permissions of certain libraries. Do your programs run under root? If so, check permissions for libphobos and whatever 32-bit libraries your program / libphobos uses (glibc? libstdc++?). -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email --- You are receiving this mail because: ---
[Issue 5278] DMD generates programs that immediately segfault.
http://d.puremagic.com/issues/show_bug.cgi?id=5278 --- Comment #8 from Sobirari Muhomori dfj1es...@sneakemail.com 2010-12-07 22:21:57 PST --- I don't know if it's related because the segfault is such a terribly vague error and I don't feel like learning how to disassemble executables again right now If dmd can generate debug info, you shouldn't need to disassemble. At least you'll know, where it crashes. d2 is a sophisticated system, it can use nifty functions in trivial cases. AFAIK, Gentoo is compiled from the source, did you use any special options like strong optimization etc? -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email --- You are receiving this mail because: ---
[Issue 5278] DMD generates programs that immediately segfault.
http://d.puremagic.com/issues/show_bug.cgi?id=5278 --- Comment #9 from Chad Joan chadj...@gmail.com 2010-12-07 23:29:58 PST --- (In reply to comment #8) I don't know if it's related because the segfault is such a terribly vague error and I don't feel like learning how to disassemble executables again right now If dmd can generate debug info, you shouldn't need to disassemble. At least you'll know, where it crashes. d2 is a sophisticated system, it can use nifty functions in trivial cases. AFAIK, Gentoo is compiled from the source, did you use any special options like strong optimization etc? For DMD I just grab the binary releases. I've never been very confident in the D-related ebuilds :( As for my system configuration and its optimization, I don't think I have anything too exotic. Here are my CFLAGS: CFLAGS=-march=nocona -O2 -finline-functions -fgcse-after-reload -pipe -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email --- You are receiving this mail because: ---
[Issue 5278] DMD generates programs that immediately segfault.
http://d.puremagic.com/issues/show_bug.cgi?id=5278
--- Comment #3 from Chad Joan chadj...@gmail.com 2010-12-06 18:12:22 PST ---
(In reply to comment #2)
Something looks wrong with your 32 bit gcc installation. Notice that gcc is
invoking the 64 bit linker. Can you successfully build any 32 bit C apps with
gcc? I'm going to guess no.
Good thought. I still seem to be able to build 32 bit C apps though:
c...@hugin ~/cprojects/ctesting $ gcc trivial.c -o trivial
c...@hugin ~/cprojects/ctesting $ file trivial
trivial: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically
linked (uses shared libs), for GNU/Linux 2.6.9, not stripped
c...@hugin ~/cprojects/ctesting $ ./trivial
c...@hugin ~/cprojects/ctesting $ gcc trivial.c -m32 -o trivial
c...@hugin ~/cprojects/ctesting $ file trivial
trivial: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV),
dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not stripped
c...@hugin ~/cprojects/ctesting $ ./trivial
c...@hugin ~/cprojects/ctesting $ cat trivial.c
int main(int argc, char *argv[])
{
return 0;
}
I checked dmd 2.050 at the same time just to make sure this isn't because I
changed my system config. It still produces segfaulting executables. I have
encountered another program that I didn't expect to segfault but did: the Gish
demo (http://www.chroniclogic.com/gish_download.htm). I don't know if it's
related because the segfault is such a terribly vague error and I don't feel
like learning how to disassemble executables again right now :/ If someone
wants to point me in the right directions to do that though, I wouldn't mind.
So hey, maybe there is something special about my system that makes things
crashy, but it'd be nice if the D executables could run on my system without
crashing like all of the other executables on my system that don't crash.
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[Issue 5278] DMD generates programs that immediately segfault.
http://d.puremagic.com/issues/show_bug.cgi?id=5278 --- Comment #4 from Brad Roberts bra...@puremagic.com 2010-12-06 18:38:25 PST --- Try gcc -v trivial.c -m32 -o trivial to see which linker is being invoked in the working 32 bit case. Also try gcc -v trivial.c -o trivial -m32 to closer match the way dmd is invoking gcc. Which linker is being invoked now? I just tried those experiments on my box, and both forms correctly built 32 bit binaries. Another thing to do to try to gather more information, on the dmd command line, add: -L-v. That should be enough to show that collect2 is being invoked with -m elf_i386. For even more details, try running dmd with: -L-v -L-Wl,-v. That will add another -v down at the ld command which will give even more output, showing that ld is being invoked with -m elf_i386 as well. I assure you that dmd produces proper 32 bit executables on my linux x86_64 box. So, the exercise here is to figure out what's different, why, and how to resolve it. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email --- You are receiving this mail because: ---
[Issue 5278] DMD generates programs that immediately segfault.
http://d.puremagic.com/issues/show_bug.cgi?id=5278 --- Comment #5 from Chad Joan chadj...@gmail.com 2010-12-06 19:35:47 PST --- Alright, here goes: c...@hugin ~/cprojects/ctesting $ gcc -v trivial.c -m32 -o trivial Reading specs from /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/specs Target: x86_64-pc-linux-gnu Configured with: /var/tmp/portage/sys-devel/gcc-4.3.2-r3/work/gcc-4.3.2/configure --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.3.2 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2/man --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include/g++-v4 --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec --disable-fixed-point --enable-nls --without-included-gettext --with-system-zlib --disable-werror --enable-secureplt --enable-multilib --enable-libmudflap --disable-libssp --disable-libgomp --enable-checking=release --disable-libgcj --enable-languages=c,c++,treelang --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --with-bugurl=http://bugs.gentoo.org/ --with-pkgversion='Gentoo Hardened 4.3.2-r3 p1.6, pie-10.1.5' Thread model: posix gcc version 4.3.2 (Gentoo Hardened 4.3.2-r3 p1.6, pie-10.1.5) COLLECT_GCC_OPTIONS='-v' '-m32' '-o' 'trivial' '-mtune=generic' /usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/cc1 -quiet -v -imultilib 32 trivial.c -fPIE -fno-strict-overflow -quiet -dumpbase trivial.c -m32 -mtune=generic -auxbase trivial -version -o /tmp/cc4qEg6K.s ignoring nonexistent directory /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/include #include ... search starts here: #include ... search starts here: /usr/local/include /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include-fixed /usr/include End of search list. GNU C (Gentoo Hardened 4.3.2-r3 p1.6, pie-10.1.5) version 4.3.2 (x86_64-pc-linux-gnu) compiled by GNU C version 4.3.2, GMP version 4.3.2, MPFR version 2.4.2-p3. GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: e8faf928abdbcb1acb2166e18d14ae3d COLLECT_GCC_OPTIONS='-v' '-m32' '-o' 'trivial' '-mtune=generic' /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/as -V -Qy --32 -o /tmp/ccEd2Qcf.o /tmp/cc4qEg6K.s GNU assembler version 2.20.1 (x86_64-pc-linux-gnu) using BFD version (GNU Binutils) 2.20.1.20100303 COMPILER_PATH=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/libexec/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/lib/gcc/x86_64-pc-linux-gnu/:/usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/libexec/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/lib/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/ LIBRARY_PATH=/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/:/lib/../lib32/:/usr/lib/../lib32/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/lib/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../:/lib/:/usr/lib/ COLLECT_GCC_OPTIONS='-v' '-m32' '-o' 'trivial' '-mtune=generic' /usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/collect2 --eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -pie -z now -o trivial /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/Scrt1.o /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crti.o /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtbeginS.o -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32 -L/lib/../lib32 -L/usr/lib/../lib32 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/lib -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../.. /tmp/ccEd2Qcf.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtendS.o /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crtn.o c...@hugin ~/cprojects/ctesting $ ./trivial c...@hugin ~/cprojects/ctesting $ c...@hugin ~/cprojects/ctesting $ gcc -v trivial.c -o trivial -m32 Reading specs from /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/specs Target: x86_64-pc-linux-gnu Configured with: /var/tmp/portage/sys-devel/gcc-4.3.2-r3/work/gcc-4.3.2/configure --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.3.2 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2/man
[Issue 5278] DMD generates programs that immediately segfault.
http://d.puremagic.com/issues/show_bug.cgi?id=5278 --- Comment #6 from Brad Roberts bra...@puremagic.com 2010-12-06 20:05:09 PST --- Does this bug report shed any light, specifically the part about changing the CHOST towards the bottom of the report? (I'm not a gentoo user, just using google to investigate similar issues). http://bugs.gentoo.org/show_bug.cgi?id=332663 If that's not it, then I'm running out of obvious things to check. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email --- You are receiving this mail because: ---
[Issue 5278] DMD generates programs that immediately segfault.
http://d.puremagic.com/issues/show_bug.cgi?id=5278 --- Comment #7 from Chad Joan chadj...@gmail.com 2010-12-06 23:44:30 PST --- (In reply to comment #6) Does this bug report shed any light, specifically the part about changing the CHOST towards the bottom of the report? (I'm not a gentoo user, just using google to investigate similar issues). http://bugs.gentoo.org/show_bug.cgi?id=332663 If that's not it, then I'm running out of obvious things to check. I'm afraid not. I haven't changed my CHOST; it's x86_64-pc-linux-gnu like always. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email --- You are receiving this mail because: ---
[Issue 5278] DMD generates programs that immediately segfault.
http://d.puremagic.com/issues/show_bug.cgi?id=5278 --- Comment #1 from Chad Joan chadj...@gmail.com 2010-11-26 09:38:22 PST --- Additional note: as far as I can tell this afflicts ALL programs I write with DMD, not just the trivial do-nothing program. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email --- You are receiving this mail because: ---
