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[Qemu-devel] Failed to use gdb with qemu 15.1 (with and without kvm supp
From: |
Francis Moreau |
Subject: |
[Qemu-devel] Failed to use gdb with qemu 15.1 (with and without kvm support) |
Date: |
Sun, 22 Jan 2012 15:20:48 +0100 |
Hello,
I'm trying to debug a 64 bits kernel (3.2) using qemu (with and
without KVM support). The host is also 64 bits. Version of gdb I'm
using is 7.1.
To do that I simply start qemu like the following:
$ qemu-system-x86_64 -kernel bzImage -append "root=/dev/sda1
console=ttyS0 3" -serial stdio -S -s
and in another term, I start gdb like this:
$ gdb vmlinux
$ target remote locahost:1234
$ b prepare_namespace
$ continue
Continuing.
Remote 'g' packet reply is too long: af75919effffffff0.............
So it fails when gdb stops on the breakpoint with the above message.
If I try to dump the backtrace I got:
$ bt
Target is executing.
$ info thread
* 1 Thread 1 (CPU#0 [running]) (running)
But the VM seems to be stopped because if I'm asking the status to qemu:
$ info status
VM status: paused
I also tried qemu with KVM support but I get one more problem: gdb is
ignoring my breakpoint.
Could anybody help me to make gdb work ?
Thanks.
--
Francis