http://pastebin.com/EuwZPna1
Last few thousand lines from the log with your patch. The crash happens immediately after qemu has called out to iscsi_ioctl with SG_IO to read the serial numbers vpd page. We get the reply back from the target but as soon as ioctl_cb returns we crash. If you comment out SG_IO in iscsi_ioctl then the crash does not happen (but the qemu does nto get serial number either) I will look more into it tonight. On Wed, Jun 19, 2013 at 2:17 AM, Laszlo Ersek <ler...@redhat.com> wrote: > On 06/19/13 06:34, ronnie sahlberg wrote: >> I can reproduce with current QEMU. >> >> Ubuntu 13 crashes with if=virtio but if=ide is fine. >> >> >> But it seems dependent on the guest/kernel. >> >> For example Fedora-18-x86_64-Live-Desktop.iso installs and runs just >> fine, even with virtio >> But both ubuntu-12.04-desktop-amd64.iso or >> ubuntu-13.04-desktop-amd64.iso crash with if=virtio >> >> >> Stack backtrace I got is >> #0 0x00007f7a9e22d037 in __GI_raise (sig=sig@entry=6) >> at ../nptl/sysdeps/unix/sysv/linux/raise.c:56 >> #1 0x00007f7a9e230698 in __GI_abort () at abort.c:90 >> #2 0x00007f7aa0a93ec8 in qemu_ram_addr_from_host_nofail ( >> ptr=ptr@entry=0x2020202024008000) at /DATA/SRC/qemu-kvm/qemu/exec.c:1399 >> #3 0x00007f7aa0a94a50 in address_space_unmap (as=<optimised out>, >> buffer=0x2020202024008000, len=<optimised out>, is_write=<optimised out>, >> access_len=1) at /DATA/SRC/qemu-kvm/qemu/exec.c:2155 >> #4 0x00007f7aa0a94bef in cpu_physical_memory_unmap (buffer=<optimised out>, >> len=<optimised out>, is_write=<optimised out>, access_len=<optimised >> out>) >> at /DATA/SRC/qemu-kvm/qemu/exec.c:2189 >> #5 0x00007f7aa0ad7867 in virtqueue_fill (vq=vq@entry=0x7f7aa34277f0, >> elem=elem@entry=0x7f7aa37ca328, len=1, idx=idx@entry=0) >> at /DATA/SRC/qemu-kvm/qemu/hw/virtio/virtio.c:243 >> #6 0x00007f7aa0ad79cf in virtqueue_push (vq=0x7f7aa34277f0, >> elem=elem@entry=0x7f7aa37ca328, len=<optimised out>) >> at /DATA/SRC/qemu-kvm/qemu/hw/virtio/virtio.c:279 >> #7 0x00007f7aa0aa9989 in virtio_blk_req_complete ( >> req=req@entry=0x7f7aa37ca320, status=status@entry=0) >> at /DATA/SRC/qemu-kvm/qemu/hw/block/virtio-blk.c:49 >> #8 0x00007f7aa0aa9ffb in virtio_blk_handle_request ( >> req=req@entry=0x7f7aa37ca320, mrb=mrb@entry=0x7fff7a7b2060) >> at /DATA/SRC/qemu-kvm/qemu/hw/block/virtio-blk.c:376 > > Can you try the attached patch? It will produce quite a bit of output on > stderr. > > Thanks > Laszlo
