We have the following test case. It compiles and runs normally on CentOS7 with Intel PSXE 2018 and devtoolset-6/devtoolset-7. In PSXE 2018 Update1 or Update 2, the same code compiles, but is broken. If, in Update1 or Update2, the code is compiled with -O1, it no longer fails:
$ cat test.cpp
#include <string>
std::string a() {
return "aaa";
}
std::string b() {
return std::string("bbbbbbbb") + std::string("c");
/* return std::string("bbbbbbb") + std::string("c"); */
}
int main( int argc, char *argv[] ) {
std::string s = a() + b();
return 0;
}[ssilverman@scottc7virt icctest]$ icpc -v; icpc -o test.gcc485 test.cpp
icpc version 18.0.2 (gcc version 4.8.5 compatibility)
[ssilverman@scottc7virt icctest]$ scl enable devtoolset-6 "icpc -v; icpc -o test.gcc631 test.cpp"
icpc version 18.0.2 (gcc version 6.3.1 compatibility)[ssilverman@scottc7virt icctest]$ scl enable devtoolset-7 "icpc -v; icpc -o test.gcc700 test.cpp"
icpc version 18.0.2 (gcc version 7.0.0 compatibility)[ssilverman@scottc7virt icctest]$ ./test.gcc485
[ssilverman@scottc7virt icctest]$ ./test.gcc631
*** Error in `./test.gcc631': double free or corruption (fasttop): 0x00000000018260a0 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x7c619)[0x7f9dbe6af619]
./test.gcc631[0x400f7d]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7f9dbe654c05]
./test.gcc631[0x400be9]
======= Memory map: ========
00400000-00404000 r-xp 00000000 fd:02 16728111 /home/ssilverman/icctest/test.gcc631
00603000-00604000 r--p 00003000 fd:02 16728111 /home/ssilverman/icctest/test.gcc631
00604000-00605000 rw-p 00004000 fd:02 16728111 /home/ssilverman/icctest/test.gcc631
01826000-01847000 rw-p 00000000 00:00 0 [heap]
7f9db8000000-7f9db8021000 rw-p 00000000 00:00 0
7f9db8021000-7f9dbc000000 ---p 00000000 00:00 0
7f9dbe42f000-7f9dbe431000 r-xp 00000000 fd:00 33780127 /usr/lib64/libdl-2.17.so
7f9dbe431000-7f9dbe631000 ---p 00002000 fd:00 33780127 /usr/lib64/libdl-2.17.so
7f9dbe631000-7f9dbe632000 r--p 00002000 fd:00 33780127 /usr/lib64/libdl-2.17.so
7f9dbe632000-7f9dbe633000 rw-p 00003000 fd:00 33780127 /usr/lib64/libdl-2.17.so
7f9dbe633000-7f9dbe7eb000 r-xp 00000000 fd:00 33709255 /usr/lib64/libc-2.17.so
7f9dbe7eb000-7f9dbe9eb000 ---p 001b8000 fd:00 33709255 /usr/lib64/libc-2.17.so
7f9dbe9eb000-7f9dbe9ef000 r--p 001b8000 fd:00 33709255 /usr/lib64/libc-2.17.so
7f9dbe9ef000-7f9dbe9f1000 rw-p 001bc000 fd:00 33709255 /usr/lib64/libc-2.17.so
7f9dbe9f1000-7f9dbe9f6000 rw-p 00000000 00:00 0
7f9dbe9f6000-7f9dbea0b000 r-xp 00000000 fd:00 37251501 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7f9dbea0b000-7f9dbec0a000 ---p 00015000 fd:00 37251501 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7f9dbec0a000-7f9dbec0b000 r--p 00014000 fd:00 37251501 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7f9dbec0b000-7f9dbec0c000 rw-p 00015000 fd:00 37251501 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7f9dbec0c000-7f9dbed0d000 r-xp 00000000 fd:00 33780129 /usr/lib64/libm-2.17.so
7f9dbed0d000-7f9dbef0c000 ---p 00101000 fd:00 33780129 /usr/lib64/libm-2.17.so
7f9dbef0c000-7f9dbef0d000 r--p 00100000 fd:00 33780129 /usr/lib64/libm-2.17.so
7f9dbef0d000-7f9dbef0e000 rw-p 00101000 fd:00 33780129 /usr/lib64/libm-2.17.so
7f9dbef0e000-7f9dbeff7000 r-xp 00000000 fd:00 33608209 /usr/lib64/libstdc++.so.6.0.19
7f9dbeff7000-7f9dbf1f7000 ---p 000e9000 fd:00 33608209 /usr/lib64/libstdc++.so.6.0.19
7f9dbf1f7000-7f9dbf1ff000 r--p 000e9000 fd:00 33608209 /usr/lib64/libstdc++.so.6.0.19
7f9dbf1ff000-7f9dbf201000 rw-p 000f1000 fd:00 33608209 /usr/lib64/libstdc++.so.6.0.19
7f9dbf201000-7f9dbf216000 rw-p 00000000 00:00 0
7f9dbf216000-7f9dbf237000 r-xp 00000000 fd:00 33699482 /usr/lib64/ld-2.17.so
7f9dbf404000-7f9dbf40a000 rw-p 00000000 00:00 0
7f9dbf435000-7f9dbf437000 rw-p 00000000 00:00 0
7f9dbf437000-7f9dbf438000 r--p 00021000 fd:00 33699482 /usr/lib64/ld-2.17.so
7f9dbf438000-7f9dbf439000 rw-p 00022000 fd:00 33699482 /usr/lib64/ld-2.17.so
7f9dbf439000-7f9dbf43a000 rw-p 00000000 00:00 0
7ffe3ce5b000-7ffe3ce7d000 rw-p 00000000 00:00 0 [stack]
7ffe3cf10000-7ffe3cf12000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]
Aborted (core dumped)[ssilverman@scottc7virt icctest]$ ./test.gcc700
*** Error in `./test.gcc700': double free or corruption (fasttop): 0x000000000166a0a0 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x7c619)[0x7fec8a577619]
./test.gcc700[0x400f5d]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7fec8a51cc05]
./test.gcc700[0x400be9]
======= Memory map: ========
00400000-00404000 r-xp 00000000 fd:02 16728113 /home/ssilverman/icctest/test.gcc700
00603000-00604000 r--p 00003000 fd:02 16728113 /home/ssilverman/icctest/test.gcc700
00604000-00605000 rw-p 00004000 fd:02 16728113 /home/ssilverman/icctest/test.gcc700
0166a000-0168b000 rw-p 00000000 00:00 0 [heap]
7fec84000000-7fec84021000 rw-p 00000000 00:00 0
7fec84021000-7fec88000000 ---p 00000000 00:00 0
7fec8a2f7000-7fec8a2f9000 r-xp 00000000 fd:00 33780127 /usr/lib64/libdl-2.17.so
7fec8a2f9000-7fec8a4f9000 ---p 00002000 fd:00 33780127 /usr/lib64/libdl-2.17.so
7fec8a4f9000-7fec8a4fa000 r--p 00002000 fd:00 33780127 /usr/lib64/libdl-2.17.so
7fec8a4fa000-7fec8a4fb000 rw-p 00003000 fd:00 33780127 /usr/lib64/libdl-2.17.so
7fec8a4fb000-7fec8a6b3000 r-xp 00000000 fd:00 33709255 /usr/lib64/libc-2.17.so
7fec8a6b3000-7fec8a8b3000 ---p 001b8000 fd:00 33709255 /usr/lib64/libc-2.17.so
7fec8a8b3000-7fec8a8b7000 r--p 001b8000 fd:00 33709255 /usr/lib64/libc-2.17.so
7fec8a8b7000-7fec8a8b9000 rw-p 001bc000 fd:00 33709255 /usr/lib64/libc-2.17.so
7fec8a8b9000-7fec8a8be000 rw-p 00000000 00:00 0
7fec8a8be000-7fec8a8d3000 r-xp 00000000 fd:00 37251501 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7fec8a8d3000-7fec8aad2000 ---p 00015000 fd:00 37251501 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7fec8aad2000-7fec8aad3000 r--p 00014000 fd:00 37251501 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7fec8aad3000-7fec8aad4000 rw-p 00015000 fd:00 37251501 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7fec8aad4000-7fec8abd5000 r-xp 00000000 fd:00 33780129 /usr/lib64/libm-2.17.so
7fec8abd5000-7fec8add4000 ---p 00101000 fd:00 33780129 /usr/lib64/libm-2.17.so
7fec8add4000-7fec8add5000 r--p 00100000 fd:00 33780129 /usr/lib64/libm-2.17.so
7fec8add5000-7fec8add6000 rw-p 00101000 fd:00 33780129 /usr/lib64/libm-2.17.so
7fec8add6000-7fec8aebf000 r-xp 00000000 fd:00 33608209 /usr/lib64/libstdc++.so.6.0.19
7fec8aebf000-7fec8b0bf000 ---p 000e9000 fd:00 33608209 /usr/lib64/libstdc++.so.6.0.19
7fec8b0bf000-7fec8b0c7000 r--p 000e9000 fd:00 33608209 /usr/lib64/libstdc++.so.6.0.19
7fec8b0c7000-7fec8b0c9000 rw-p 000f1000 fd:00 33608209 /usr/lib64/libstdc++.so.6.0.19
7fec8b0c9000-7fec8b0de000 rw-p 00000000 00:00 0
7fec8b0de000-7fec8b0ff000 r-xp 00000000 fd:00 33699482 /usr/lib64/ld-2.17.so
7fec8b2cc000-7fec8b2d2000 rw-p 00000000 00:00 0
7fec8b2fd000-7fec8b2ff000 rw-p 00000000 00:00 0
7fec8b2ff000-7fec8b300000 r--p 00021000 fd:00 33699482 /usr/lib64/ld-2.17.so
7fec8b300000-7fec8b301000 rw-p 00022000 fd:00 33699482 /usr/lib64/ld-2.17.so
7fec8b301000-7fec8b302000 rw-p 00000000 00:00 0
7ffec8c7f000-7ffec8ca1000 rw-p 00000000 00:00 0 [stack]
7ffec8d11000-7ffec8d13000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]
Aborted (core dumped)