.
Thread 3 (Thread 0x7f7e6ca35700 (LWP 16128)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:215
No locals.
#1  0x00007f7e78cf1df9 in cond_timedwait (ts=0x7f7e6ca34de0, cond=<optimized out>, mutex=<optimized out>) at /build/buildd/qemu-kvm-1.1~rc+dfsg/posix-aio-compat.c:106
        ret = <optimized out>
        mutex = 0x7f7e795f6e00
        cond = 0x7f7e795f6e60
#2  aio_thread (unused=<optimized out>) at /build/buildd/qemu-kvm-1.1~rc+dfsg/posix-aio-compat.c:336
        aiocb = <optimized out>
        ret = <optimized out>
        tv = {tv_sec = 1343262926, tv_usec = 930938}
        ts = {tv_sec = 1343262936, tv_nsec = 0}
#3  0x00007f7e74fcde9a in start_thread (arg=0x7f7e6ca35700) at pthread_create.c:308
        __res = <optimized out>
        pd = 0x7f7e6ca35700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 6818788965171548563, 140181178904224, 140180965251520, 0, 3, -6891091093668540013, -6891108218229534317}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#4  0x00007f7e74cfb4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#5  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (Thread 0x7f7e78b417c0 (LWP 16126)):
#0  0x00007f7e74cf4823 in select () at ../sysdeps/unix/syscall-template.S:82
No locals.
#1  0x00007f7e78ce3d01 in os_host_main_loop_wait (timeout=4294967295) at /build/buildd/qemu-kvm-1.1~rc+dfsg/main-loop.c:308
        tv = {tv_sec = 140181170871584, tv_usec = 8399395886827538176}
        tvarg = <optimized out>
        ret = <optimized out>
#2  main_loop_wait (nonblocking=<optimized out>) at /build/buildd/qemu-kvm-1.1~rc+dfsg/main-loop.c:496
        ret = -1
        timeout = 4294967295
#3  0x00007f7e78bf65cb in main_loop () at /build/buildd/qemu-kvm-1.1~rc+dfsg/vl.c:1566
        nonblocking = <optimized out>
        last_io = 1
#4  main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at /build/buildd/qemu-kvm-1.1~rc+dfsg/vl.c:3694
        i = <optimized out>
        snapshot = 0
        linux_boot = <optimized out>
        icount_option = 0x0
        initrd_filename = <optimized out>
        kernel_filename = <optimized out>
        kernel_cmdline = <optimized out>
        boot_devices = "dc", '\000' <repeats 30 times>
        ds = 0x7f7e79f83440
        dcl = <optimized out>
        cyls = 0
        heads = 0
        secs = 0
        translation = 0
        hda_opts = <optimized out>
        opts = <optimized out>
        machine_opts = <optimized out>
        olist = <optimized out>
        optind = 48
        optarg = 0x7fff6f863f5a "virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5"
        loadvm = 0x0
        machine = 0x7f7e791e3960
        cpu_model = 0x0
        vga_model = 0x7fff6f863f4b "cirrus"
        pid_file = 0x0
        incoming = 0x0
        defconfig = <optimized out>
        userconfig = false
        log_mask = 0x0
        log_file = 0x0
        mem_trace = {malloc = 0x7f7e78cdcc80 <malloc_and_trace>, realloc = 0x7f7e78cdcc40 <realloc_and_trace>, free = 0x7f7e78cdcc00 <free_and_trace>, calloc = 0, try_malloc = 0, try_realloc = 0}
        trace_events = 0x0
        trace_file = 0x0
.
Thread 1 (Thread 0x7f7e6be32700 (LWP 16129)):
#0  0x00007f7e78cdb89e in virtio_pci_mask_vq (vector=vector@entry=1, vq=0x7f7e7a00f100, masked=masked@entry=0, dev=<error reading variable: Unhandled dwarf expression opcode 0xfa>) at /build/buildd/qemu-kvm-1.1~rc+dfsg/hw/virtio-pci.c:546
        notifier = 0x7f7e7a00f148
        r = <optimized out>
#1  0x00007f7e78cdb9b7 in virtio_pci_mask_notifier (dev=0x7f7e79ff5670, vector=1, masked=0) at /build/buildd/qemu-kvm-1.1~rc+dfsg/hw/virtio-pci.c:576
        proxy = 0x7f7e79ff5670
        vdev = 0x7f7e7a002fd0
        r = <optimized out>
        n = <optimized out>
#2  0x00007f7e78cb7e27 in msix_set_mask_notifier_for_vector (vector=1, dev=0x7f7e79ff5670) at /build/buildd/qemu-kvm-1.1~rc+dfsg/hw/msix.c:562
No locals.
#3  msix_set_mask_notifier (dev=dev@entry=0x7f7e79ff5670, f=f@entry=0x7f7e78cdb930 <virtio_pci_mask_notifier>) at /build/buildd/qemu-kvm-1.1~rc+dfsg/hw/msix.c:577
        r = 0
        n = <optimized out>
        __PRETTY_FUNCTION__ = "msix_set_mask_notifier"
#4  0x00007f7e78cdaa6f in virtio_pci_set_guest_notifiers (opaque=0x7f7e79ff5670, assign=true) at /build/buildd/qemu-kvm-1.1~rc+dfsg/hw/virtio-pci.c:651
        proxy = 0x7f7e79ff5670
        vdev = 0x7f7e7a002fd0
        r = <optimized out>
        n = <optimized out>
        __PRETTY_FUNCTION__ = "virtio_pci_set_guest_notifiers"
#5  0x00007f7e78e33710 in vhost_dev_start (hdev=hdev@entry=0x7f7e79ca4760, vdev=vdev@entry=0x7f7e7a002fd0) at /build/buildd/qemu-kvm-1.1~rc+dfsg/hw/vhost.c:882
        i = <optimized out>
        r = <optimized out>
#6  0x00007f7e78e34076 in vhost_net_start (net=0x7f7e79ca4760, dev=dev@entry=0x7f7e7a002fd0) at /build/buildd/qemu-kvm-1.1~rc+dfsg/hw/vhost_net.c:158
        file = {index = 0, fd = 0}
        r = 0
        __PRETTY_FUNCTION__ = "vhost_net_start"
#7  0x00007f7e78e36861 in virtio_net_vhost_status (status=7 '\a', n=0x7f7e7a002fd0) at /build/buildd/qemu-kvm-1.1~rc+dfsg/hw/virtio-net.c:127
        r = <optimized out>
#8  virtio_net_set_status (vdev=0x7f7e7a002fd0, status=<optimized out>) at /build/buildd/qemu-kvm-1.1~rc+dfsg/hw/virtio-net.c:144
No locals.
#9  0x00007f7e78e3b6a2 in virtio_set_status (vdev=vdev@entry=0x7f7e7a002fd0, val=val@entry=7 '\a') at /build/buildd/qemu-kvm-1.1~rc+dfsg/hw/virtio.c:517
No locals.
#10 0x00007f7e78cdb4a9 in virtio_ioport_write (opaque=0x7f7e79ff5670, addr=<optimized out>, val=7) at /build/buildd/qemu-kvm-1.1~rc+dfsg/hw/virtio-pci.c:322
        proxy = 0x7f7e79ff5670
        vdev = 0x7f7e7a002fd0
        pa = <optimized out>
        __func__ = "virtio_ioport_write"
#11 0x00007f7e78d99343 in memory_region_iorange_write (iorange=<optimized out>, offset=18, width=1, data=<optimized out>) at /build/buildd/qemu-kvm-1.1~rc+dfsg/memory.c:427
        mrp = <optimized out>
        mrio = <optimized out>
        mr = 0x7f7e79ff5aa8
        __PRETTY_FUNCTION__ = "memory_region_iorange_write"
#12 0x00007f7e78d8c9a1 in kvm_handle_io (count=1, size=1, direction=1, data=<optimized out>, port=49266) at /build/buildd/qemu-kvm-1.1~rc+dfsg/kvm-all.c:1139
        i = <optimized out>
        ptr = 0x7f7e78b7a000 <Address 0x7f7e78b7a000 out of bounds>
#13 kvm_cpu_exec (env=env@entry=0x7f7e79f6e6c0) at /build/buildd/qemu-kvm-1.1~rc+dfsg/kvm-all.c:1287
        run = 0x7f7e78b79000
        ret = <optimized out>
        run_ret = <optimized out>
#14 0x00007f7e78d63cb1 in qemu_kvm_cpu_thread_fn (arg=0x7f7e79f6e6c0) at /build/buildd/qemu-kvm-1.1~rc+dfsg/cpus.c:752
        env = 0x7f7e79f6e6c0
        r = <optimized out>
#15 0x00007f7e74fcde9a in start_thread (arg=0x7f7e6be32700) at pthread_create.c:308
        __res = <optimized out>
        pd = 0x7f7e6be32700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 6818788965171548563, 140735064445776, 140180952656320, 0, 3, -6891101537418391149, -6891108218229534317}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#16 0x00007f7e74cfb4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#17 0x0000000000000000 in ?? ()
No symbol table info available.