http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51771
--- Comment #4 from Luke Dalessandro <luked at cs dot rochester.edu> 2012-05-03 15:06:57 UTC --- Created attachment 27303 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27303 RBTree microbenchmark test case I believe that I'm seeing this in the RSTM suite's RBTree microbenchmark as well. It appears to be manifesting with the same symptoms as pr47530, _ITM_commitTransaction is generated as a tail call. An abort in _ITM_commitTransaction during multithreaded execution corrupts the stack slot that is used to hold a "time" value. I attached the TreeBench.ii test case so that a second, complex example of the problem exists. Static manifestation of bug is "jmp _ITM_commitTransaction" in asm output. $ g++ -O3 -fgnu-tm -o /dev/stdout -S TreeBench.ii | grep _ITM_commitTransaction call _ITM_commitTransaction jmp _ITM_commitTransaction jmp _ITM_commitTransaction Runtime manifestation is corrupted "time" output (and thus "throughput" output as well) under multithreaded execution ("p" command line parameter) of the optimized executable. $ g++ -fgnu-tm -o TreeBench TreeBench.ii -lrt $ ./TreeBench -p2 Verification: Passed csv, ALG=gcc-tm, B=RBTree, R=34, d=1, p=2, X=0, m=256, S=1, O=1, txns=1251624, time=1000001773, throughput=1251621 $ g++ -O3 -fgnu-tm -o TreeBench TreeBench.ii -lrt $ ./TreeBench -p2 Verification: Passed csv, ALG=gcc-tm, B=RBTree, R=34, d=1, p=2, X=0, m=256, S=1, O=1, txns=391668795, time=1336057254755574655, throughput=0 Output from g++ -v -save-temps. $ g++ -fgnu-tm -O3 -m64 -DSTM_INST_STM -DSTM_API_GCCTM -DSTM_CC_GCC -DSTM_OS_LINUX -DSTM_CPU_X86 -DSTM_BITS_64 -DSTM_OPT_O3 -DSTM_WS_BYTELOG -DSINGLE_SOURCE_BUILD -I../include -I../lib -v -save-temps TreeBench.cpp -lrt Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/localdisk/luked/pub/gcc/4.8/bin/../libexec/gcc/x86_64-redhat-linux/4.8.0/lto-wrapper Target: x86_64-redhat-linux Configured with: ../gcc-4.8/configure --prefix=/u/luked/pub/gcc/4.8 --enable-bootstrap --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa-atexit --disable-libunwind-exceptions --enable-linker-build-id --enable-plugins --enable-lto --disable-nls --enable-ld --enable-gold --with-gmp=/u/luked/pub/gmp-5.0.4-static --with-mpfr=/u/luked/pub/mpfr-3.1.0-static --with-mpc=/u/luked/pub/mpc-0.9-static --with-ppl=/u/luked/pub/ppl-0.11.2-static --with-cloog=/u/luked/pub/cloog-0.16.3-static --enable-cloog-backend=isl --with-tune=generic --with-arch-32=i686 --with-gnu-ld --with-gnu-as --with-plugin-ld=ld.gold --build=x86_64-redhat-linux --with-host-libstdcxx='/usr/local/lib64/libstdc++.a -lm' --enable-languages=c,c++,lto : (reconfigured) Thread model: posix gcc version 4.8.0 20120502 (experimental) [trunk revision 187050] (GCC) COLLECT_GCC_OPTIONS='-fgnu-tm' '-O3' '-m64' '-D' 'STM_INST_STM' '-D' 'STM_API_GCCTM' '-D' 'STM_CC_GCC' '-D' 'STM_OS_LINUX' '-D' 'STM_CPU_X86' '-D' 'STM_BITS_64' '-D' 'STM_OPT_O3' '-D' 'STM_WS_BYTELOG' '-D' 'SINGLE_SOURCE_BUILD' '-I' '../include' '-I' '../lib' '-v' '-save-temps' '-shared-libgcc' '-mtune=generic' '-march=x86-64' '-pthread' /localdisk/luked/pub/gcc/4.8/bin/../libexec/gcc/x86_64-redhat-linux/4.8.0/cc1plus -E -quiet -v -I ../include -I ../lib -iprefix /localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/ -D_GNU_SOURCE -D_REENTRANT -D STM_INST_STM -D STM_API_GCCTM -D STM_CC_GCC -D STM_OS_LINUX -D STM_CPU_X86 -D STM_BITS_64 -D STM_OPT_O3 -D STM_WS_BYTELOG -D SINGLE_SOURCE_BUILD TreeBench.cpp -m64 -mtune=generic -march=x86-64 -fgnu-tm -O3 -fpch-preprocess -o TreeBench.ii ignoring nonexistent directory "/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../x86_64-redhat-linux/include" ignoring duplicate directory "/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/../../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../include/c++/4.8.0" ignoring duplicate directory "/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/../../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../include/c++/4.8.0/x86_64-redhat-linux" ignoring duplicate directory "/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/../../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../include/c++/4.8.0/backward" ignoring duplicate directory "/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/../../lib/gcc/x86_64-redhat-linux/4.8.0/include" ignoring duplicate directory "/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/../../lib/gcc/x86_64-redhat-linux/4.8.0/include-fixed" ignoring nonexistent directory "/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/../../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../x86_64-redhat-linux/include" #include "..." search starts here: #include <...> search starts here: ../include ../lib /localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../include/c++/4.8.0 /localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../include/c++/4.8.0/x86_64-redhat-linux /localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../include/c++/4.8.0/backward /localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/include /localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/include-fixed /usr/local/include /localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/../../include /usr/include End of search list. COLLECT_GCC_OPTIONS='-fgnu-tm' '-O3' '-m64' '-D' 'STM_INST_STM' '-D' 'STM_API_GCCTM' '-D' 'STM_CC_GCC' '-D' 'STM_OS_LINUX' '-D' 'STM_CPU_X86' '-D' 'STM_BITS_64' '-D' 'STM_OPT_O3' '-D' 'STM_WS_BYTELOG' '-D' 'SINGLE_SOURCE_BUILD' '-I' '../include' '-I' '../lib' '-v' '-save-temps' '-shared-libgcc' '-mtune=generic' '-march=x86-64' '-pthread' /localdisk/luked/pub/gcc/4.8/bin/../libexec/gcc/x86_64-redhat-linux/4.8.0/cc1plus -fpreprocessed TreeBench.ii -quiet -dumpbase TreeBench.cpp -m64 -mtune=generic -march=x86-64 -auxbase TreeBench -O3 -version -fgnu-tm -o TreeBench.s GNU C++ (GCC) version 4.8.0 20120502 (experimental) [trunk revision 187050] (x86_64-redhat-linux) compiled by GNU C version 4.8.0 20120502 (experimental) [trunk revision 187050], GMP version 5.0.4, MPFR version 3.1.0, MPC version 0.9 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 GNU C++ (GCC) version 4.8.0 20120502 (experimental) [trunk revision 187050] (x86_64-redhat-linux) compiled by GNU C version 4.8.0 20120502 (experimental) [trunk revision 187050], GMP version 5.0.4, MPFR version 3.1.0, MPC version 0.9 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: c6589865671e480899c2bc410ddd1367 COLLECT_GCC_OPTIONS='-fgnu-tm' '-O3' '-m64' '-D' 'STM_INST_STM' '-D' 'STM_API_GCCTM' '-D' 'STM_CC_GCC' '-D' 'STM_OS_LINUX' '-D' 'STM_CPU_X86' '-D' 'STM_BITS_64' '-D' 'STM_OPT_O3' '-D' 'STM_WS_BYTELOG' '-D' 'SINGLE_SOURCE_BUILD' '-I' '../include' '-I' '../lib' '-v' '-save-temps' '-shared-libgcc' '-mtune=generic' '-march=x86-64' '-pthread' /localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../x86_64-redhat-linux/bin/as -v -I ../include -I ../lib --64 -o TreeBench.o TreeBench.s GNU assembler version 2.22.52 (x86_64-redhat-linux) using BFD version (GNU Binutils) 2.22.52.20120502 COMPILER_PATH=/localdisk/luked/pub/gcc/4.8/bin/../libexec/gcc/x86_64-redhat-linux/4.8.0/:/localdisk/luked/pub/gcc/4.8/bin/../libexec/gcc/:/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../x86_64-redhat-linux/bin/ LIBRARY_PATH=/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/:/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/:/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../x86_64-redhat-linux/lib/:/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/../../../:/lib/:/usr/lib/ Reading specs from /localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../lib64/libitm.spec COLLECT_GCC_OPTIONS='-fgnu-tm' '-O3' '-m64' '-D' 'STM_INST_STM' '-D' 'STM_API_GCCTM' '-D' 'STM_CC_GCC' '-D' 'STM_OS_LINUX' '-D' 'STM_CPU_X86' '-D' 'STM_BITS_64' '-D' 'STM_OPT_O3' '-D' 'STM_WS_BYTELOG' '-D' 'SINGLE_SOURCE_BUILD' '-I' '../include' '-I' '../lib' '-v' '-save-temps' '-shared-libgcc' '-mtune=generic' '-march=x86-64' '-pthread' /localdisk/luked/pub/gcc/4.8/bin/../libexec/gcc/x86_64-redhat-linux/4.8.0/collect2 --build-id --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 /usr/lib/../lib64/crt1.o /usr/lib/../lib64/crti.o /localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/crtbegin.o -L/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0 -L/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc -L/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/../../../../x86_64-redhat-linux/lib -L/localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/../../.. TreeBench.o -lrt -lstdc++ -lm -litm -lgcc_s -lgcc -lpthread -lc -lgcc_s -lgcc /localdisk/luked/pub/gcc/4.8/bin/../lib/gcc/x86_64-redhat-linux/4.8.0/crtend.o /usr/lib/../lib64/crtn.o
