On 17.08.2010 20:06, Jan Kiszka wrote: > Stefan Kisdaroczi wrote: > >> I installed the kernel (2.6.32.15 2.5.4 x86 32bit) which is working on >> my laptop in a kvm machine. >> In the virtual machine the kernel never starts and hangs. >> > To make sure you are not facing a KVM issue (though they are much rarer > theses days - given you are using a recent KVM version...), please > cross-check if the guest behaves identically when booting without KVM > support (-no-kvm when using qemu-kvm). >
Hi Jan, thanks for the hints. With versions 0.12.4 setting breakpoints with gdb didn't work, with 0.12.5 they work. Stefan >> I attached gdb to kvm and according to the cpu registers and system.map >> it hangs in 'doublefault_fn'. As I'm not really familiar with gdb i'm >> thankful if someone has a hint how to proceed. Thanks >> > Build the kernel with CONFIG_DEBUG_INFO, start "gdb > /linux/src/path/vmlinux", then type "bt" at the gdb prompt when the > guest hangs. This should dump a symbolic backtrace - though likely not > beyond the exception entry. In that case, you could help us by examining > the origin of the exception (parameters to the exception handler, it > specifically receives a full register state). > > Also note that there are graphical debuggers, e.g. ddd, that can help > working with gdb without knowing all its commands by heart. > > Jan > >
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