Hi, I'm trying to debug the systat utility for learning purposes. I enabled -g -O0 in the Makefile, and built it in /usr/src/usr.bin/systat. It builds and runs fine. However, gdb cannot insert any breakspoints. I'm on a very recent snapshot and everything is fully patched.
I set kern.global_ptrace=1 and gdb can attach. Trying to insert a breakpoint causes the following error: $ gdb GNU gdb 6.3 Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "amd64-unknown-openbsd6.8" (gdb) file systat Reading symbols from /usr/src/usr.bin/systat/systat...done. (gdb) attach 51616 Attaching to program: /usr/src/usr.bin/systat/systat, process 51616 [Switching to thread 588561] 0x00000b5f3d6c5c8a in ?? () (gdb) b engine.c:1156 Breakpoint 1 at 0x13aca: file engine.c, line 1156. (gdb) info b Num Type Disp Enb Address What 1 breakpoint keep y 0x0000000000013aca in message_set at engine.c:1156 (gdb) c Continuing. Warning: Cannot insert breakpoint 1. Error accessing memory address 0x13aca: Input/output error. If I build a simple C program debugging works fine. I can even debug tmux built from git fine with either gdb or egdb. Any ideas? How would one proceed if one was investigating a bug? Thanks, Anindya
