https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93000
Bug ID: 93000 Summary: [gdb] gdb failed to break on an executed address Product: gcc Version: 8.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: debug Assignee: unassigned at gcc dot gnu.org Reporter: yangyibiao at hust dot edu.cn Target Milestone: --- $ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper OFFLOAD_TARGET_NAMES=nvptx-none OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 8.3.0-6ubuntu1~18.04.1' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-8 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 8.3.0 (Ubuntu 8.3.0-6ubuntu1~18.04.1) ############################ test program ############################ $ cat small.c /* { dg-do run } */ /* { dg-options "-fsanitize=undefined -fsanitize-undefined-trap-on-error" } */ int __attribute__((noinline,noclone)) h(int a) { return 2 * (a * (__INT_MAX__/2 + 1)); } int __attribute__((noinline,noclone)) i(int a) { return (2 * a) * (__INT_MAX__/2 + 1); } int __attribute__((noinline,noclone)) j(int a, int b) { return (b * a) * (__INT_MAX__/2 + 1); } int __attribute__((noinline,noclone)) k(int a, int b) { return (2 * a) * b; } int main() { volatile int tem = h(-1); tem = i(-1); tem = j(-1, 2); tem = k(-1, __INT_MAX__/2 + 1); return 0; } ############################ gdb commands ############################ $ cat cmds1 break *i+0x0 run kill q $ cat cmds2 break *j+0x0 run kill q ############################ execute commands ############################ $ gdb -batch -x cmds1 ./small.obj Breakpoint 1 at 0x5e6: file small.c, line 11. [7]+ Stopped gdb -batch -x cmds ./small.obj $ gdb -batch -x cmds2 ./small.obj Breakpoint 1 at 0x5f7: file small.c, line 16. Breakpoint 1, j (a=-1, b=0) at small.c:16 16 { Kill the program being debugged? (y or n) [answered Y; input not from terminal] [Inferior 1 (process 15108) killed] ############################ problem ############################ gdb failed to break at address "*i+0x0" while it breaks at address "*j+0x0" function "i" and "j" are both executed functions called by "main" function in the test program.