BTW. make check-sanitizer would have likely found this issue, might want to enable it? I believe it knows which sanitizers should work
2016-11-11 0:46 GMT+01:00 Norbert Lange <nolang...@gmail.com>: > Tags: patch > > > Hi, > > I got it working, seems that from the 3 related patched, one is already > applied. > The attached archive is the 3 patches and a edited "series" file, > it should be painless for you to integrate it into the debian/patches > directory for 3.9 > > I did not try with 3.8 yet (possibly more difficult), building llvm > takes quite a while. > > Kind Regards, > Norbert > > 2016-11-09 11:04 GMT+01:00 Norbert Lange <nolang...@gmail.com>: >> Hi, >> >> researched a bit further and the same compiled programm will run fine >> on debian jessie. >> I tracked it down to being caused by a newer glibc version [1][2], >> apparently during loading of shared libs, glibc can now allocate >> memory which messes up sanitzers (mostly in more subtile ways than the >> memory sanitizer). >> >> The result is, that if stretch will ship with the current glibc, clang >> and gcc (I dont think its patched there either), then the sanitizers >> won`t be usable. >> 1) revert the fix in glibc. Would have the advantage that "sanitized" >> binaries compiled from current and older clang/gcc versions will work >> 2) adopt the fixed from upstream [3][4] (possibly more) into clang >> (and possibly gcc). >> or maybe both? >> >> Kind Regards, >> Norbert >> >> PS. shouldn`t the testsuite catch these bugs? >> >> [1] >> https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=24e2b1cede1952d7d4411a3cafd25dd8593dab9f >> [2] https://llvm.org/bugs/show_bug.cgi?id=27310 >> [3] >> https://github.com/llvm-mirror/compiler-rt/commit/827ea206c1078fc7c7da287984a7ba4563390589 >> [4] >> https://github.com/llvm-mirror/compiler-rt/commit/570ee9dd7a6f90b0370a86535cbde6738d0ccf67 >> >> 2016-10-31 21:43 GMT+01:00 Norbert Lange <nolang...@gmail.com>: >>> On Mon, 31 Oct 2016 08:38:21 +0100 Sylvestre Ledru <sylves...@debian.org> >>> wrote: >>>> Le 31/10/2016 à 00:39, Norbert Lange a écrit : >>>> > Package: clang-3.9 >>>> > Version: 1:3.9-2 >>>> > Severity: normal >>>> > >>>> > Dear Maintainer, >>>> > >>>> > The memory sanitizer is unusable as it segfaults during initialization. >>>> > To reproduce: >>>> > echo 'int main() { return 0; }' >/tmp/test.c >>>> > clang -fsanitize=memory -o test test.c >>>> can you try with clang-3.9 instead? >>> >>> Same thing, output: >>> >>> $ clang-3.9 -fsanitize=memory -o test test.c -v >>> clang version 3.9.0-2 (tags/RELEASE_390/final) >>> Target: x86_64-pc-linux-gnu >>> Thread model: posix >>> InstalledDir: /usr/bin >>> Found candidate GCC installation: /usr/bin/../lib/gcc/i686-linux-gnu/6 >>> Found candidate GCC installation: /usr/bin/../lib/gcc/i686-linux-gnu/6.2.0 >>> Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5 >>> Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.1 >>> Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6 >>> Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6.2.0 >>> Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6 >>> Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6.2.0 >>> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5 >>> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.1 >>> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6 >>> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.2.0 >>> Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6.2.0 >>> Candidate multilib: .;@m64 >>> Candidate multilib: 32;@m32 >>> Candidate multilib: x32;@mx32 >>> Selected multilib: .;@m64 >>> "/usr/lib/llvm-3.9/bin/clang" -cc1 -triple x86_64-pc-linux-gnu >>> -emit-obj -mrelax-all -disable-free -disable-llvm-verifier >>> -discard-value-names -main-file-name test.c -mrelocation-model static >>> -mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose >>> -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu >>> x86-64 -v -dwarf-column-info -debugger-tuning=gdb -resource-dir >>> /usr/lib/llvm-3.9/bin/../lib/clang/3.9.0 -internal-isystem >>> /usr/local/include -internal-isystem >>> /usr/lib/llvm-3.9/bin/../lib/clang/3.9.0/include >>> -internal-externc-isystem /usr/include/x86_64-linux-gnu >>> -internal-externc-isystem /include -internal-externc-isystem >>> /usr/include -fdebug-compilation-dir /tmp -ferror-limit 19 >>> -fmessage-length 135 -fsanitize=memory >>> -fsanitize-blacklist=/usr/lib/llvm-3.9/bin/../lib/clang/3.9.0/msan_blacklist.txt >>> -fno-assume-sane-operator-new -fobjc-runtime=gcc >>> -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/test-2d4d2c.o -x >>> c test.c >>> clang -cc1 version 3.9.0 based upon LLVM 3.9.0 default target >>> x86_64-pc-linux-gnu >>> ignoring nonexistent directory "/include" >>> #include "..." search starts here: >>> #include <...> search starts here: >>> /usr/local/include >>> /usr/lib/llvm-3.9/bin/../lib/clang/3.9.0/include >>> /usr/include/x86_64-linux-gnu >>> /usr/include >>> End of search list. >>> "/usr/bin/ld" --hash-style=both --eh-frame-hdr -m elf_x86_64 >>> -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o test >>> /usr/bin/../lib/gcc/x86_64-linux-gnu/6.2.0/../../../x86_64-linux-gnu/crt1.o >>> /usr/bin/../lib/gcc/x86_64-linux-gnu/6.2.0/../../../x86_64-linux-gnu/crti.o >>> /usr/bin/../lib/gcc/x86_64-linux-gnu/6.2.0/crtbegin.o >>> -L/usr/bin/../lib/gcc/x86_64-linux-gnu/6.2.0 >>> -L/usr/bin/../lib/gcc/x86_64-linux-gnu/6.2.0/../../../x86_64-linux-gnu >>> -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu >>> -L/usr/bin/../lib/gcc/x86_64-linux-gnu/6.2.0/../../.. >>> -L/usr/lib/llvm-3.9/bin/../lib -L/lib -L/usr/lib -whole-archive >>> /usr/lib/llvm-3.9/bin/../lib/clang/3.9.0/lib/linux/libclang_rt.msan-x86_64.a >>> -no-whole-archive >>> --dynamic-list=/usr/lib/llvm-3.9/bin/../lib/clang/3.9.0/lib/linux/libclang_rt.msan-x86_64.a.syms >>> /tmp/test-2d4d2c.o --no-as-needed -lpthread -lrt -lm -ldl -lgcc >>> --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s >>> --no-as-needed /usr/bin/../lib/gcc/x86_64-linux-gnu/6.2.0/crtend.o >>> /usr/bin/../lib/gcc/x86_64-linux-gnu/6.2.0/../../../x86_64-linux-gnu/crtn.o
