Ok this issue has been fixed in qemu 0.12.4. Just type 'qemu --version' to see what version you have, it is probably outdated.
-- qemu doesn't stop execution upon hitting a breakpoint https://bugs.launchpad.net/bugs/581353 You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. Status in QEMU: New Bug description: Using Qemu 0.12.3 and gdb 7.1 on Ubuntu Lucid. I'm trying to debug some bootloader code. Using qemu -s -S to run the bootloader and gdb to connect to qemu, I set the breakpoint at 0x7c00. Then I type continue in gdb. The breakpoint is hit and gdb shows debug information. However qemu apparently continues to execute the code of the bootloader as the text is printed on the screen etc.