Version: 6.5 System: x86_64-unknown-linux-gnu fedora core 4
Compiler: gcc-4.0.0-8 gdb can not handle one sort of binary executables that are otherwise ran normally by the system. They are those linked with `-pie' passed to linking `cc'. They may also be detected by `file' reporting executable to be ELF 64-bit LSB shared object, AMD x86-64, version 1 (SYSV), not stripped (Otherwise, it reports them as) ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared libs), not stripped Otherwise they are regular executables, having `main' and `_start' symbols, and having entry point at `_start'. System runs program built this way normally. Program may be built with debugging information (`-g'), and later assuming that. `at' gdb command completes normally, but `bt' does not show line numbers. Even `i sh' shows no shared libraries, though `ldd' shows that there should be some. `b' with line numbers completes normally, and then `c' outputs: Continuing. Warning: Cannot insert breakpoint 2. Error accessing memory address 0x6f66e: Input/output error. All of these commands break the same way even if using `r' instead of `at'. Once the program is relinked without `-pie', even from the same object files, gdb works normally. Such an executables are actually part of some systems. They are abundant in one installed from <http://download.fedoraproject.org/pub/fedora/linux/core/4/x86_64/>, (see <http://fedoraproject.org/wiki/Distribution/Download#head-e82afb53c564fe4d3c977246c5760fad2edfccd9> for other ways to download). This includes, but not limited to, `/usr/bin/at', `/usr/bin/dig', `/usr/bin/host', `/usr/bin/omshell', `/usr/bin/svn'. (Hope that this is enough.) _______________________________________________ bug-gdb mailing list bug-gdb@gnu.org http://lists.gnu.org/mailman/listinfo/bug-gdb