On Sun, 10 Apr 2011, Amos Kong wrote:
virtio_console__inject_interrupt tries to use virt queues before guest tell us to initialize them.(gdb) r run -i linux-0.2.img -k ./vmlinuz-2.6.38-rc6+ -r ./initrd.img-2.6.38-rc6+ -p=init=1 -m 500 -c Starting program: /project/rh/kvm-tools/tools/kvm/kvm run -i linux-0.2.img -k ./vmlinuz-2.6.38-rc6+ -r ./initrd.img-2.6.38-rc6+ -p=init=1 -m 500 -c [Thread debugging using libthread_db enabled] [New Thread 0x7fffd6e2d700 (LWP 19280)] Warning: request type 8 Program received signal SIGSEGV, Segmentation fault. 0x00000000004026ca in virt_queue__available (vq=0x60d3c8) at include/kvm/virtio.h:31 31 return vq->vring.avail->idx != vq->last_avail_idx; (gdb) (gdb) bt (gdb) p *vq $2 = {vring = {num = 0, desc = 0x0, avail = 0x0, used = 0x0}, pfn = 0, last_avail_idx = 0} include/kvm/virtio-console.h: 59 void virtio_console__inject_interrupt(struct kvm *self) .... 71 if (term_readable(CONSOLE_VIRTIO) && virt_queue__available(vq)) { 72 head = virt_queue__get_iov(vq, iov, &out, &in, self); ^^^^ then this block will not be executed if virtio_queue is unavaiable. Changes from v1: - move the check of virt_queue out of virt_queue__get_iov() Reported-by: Amos Kong <[email protected]> Signed-off-by: Asias He <[email protected]> Signed-off-by: Amos Kong <[email protected]>
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