Dear all, I am trying to debug QEMU via GDB. I configured and compiled QEMU with debugging flags, i.e., # CFLAGS="-g3 -O0" ./configure --disable-gfx-check and run gdb: # gdb ./i386-linux-user/qemu-i386 (gdb) break main (gdb) run Starting program: /home/test/femu/i386-linux-user/qemu-i386 Failed to read a valid object file image from memory. Warning: Cannot insert breakpoint 1. Error accessing memory address 0x2f7df: Input/output error. Is there any extra flag to be specified with the GDB for QEMU debugging? I am wondering if the QEMU virtual machine creates any problem to the GDB virtual machine. Thanks.