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Re: [Qemu-devel] [PULL] Memory core space reduction


From: Anthony Liguori
Subject: Re: [Qemu-devel] [PULL] Memory core space reduction
Date: Tue, 28 Feb 2012 12:56:38 -0600
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.23) Gecko/20110922 Lightning/1.0b2 Thunderbird/3.1.15

On 02/28/2012 12:15 PM, Avi Kivity wrote:
On 02/28/2012 08:13 PM, Anthony Liguori wrote:

FWIW, I'm processing this PULL request right now and I'm seeing a SEGV
too.  The backtrace is a malloc failure in QOM.


How do we reproduce this?

The guest never gets to run so I don't think the initrd/vmlinuz matter.

/home/anthony/build/qemu/x86_64-softmmu/qemu-system-x86_64 -kernel bin/vmlinuz-3.0 -initrd .tmp-11243/initramfs-11243.img.gz -append "console=ttyS0 seed=57279" -nographic -enable-kvm -hda /home/anthony/images/linux.img -M pc-1.0 -drive file=/home/anthony/images/linux.img,if=virtio,snapshot=on -device virtio-balloon-pci -device virtio-serial -net nic,model=virtio -net user -snapshot

#0  0x00007f031caf9b5d in malloc_consolidate (av=0x7f031ce111c0)
    at malloc.c:5169
#1  0x00007f031cafb472 in _int_malloc (av=0x7f031ce111c0, bytes=16512)
    at malloc.c:4373
#2  0x00007f031cafe31e in __libc_malloc (bytes=16512) at malloc.c:3660
#3  0x00007f03202f47ae in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f03202f4aba in g_malloc0 ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f0320d23f62 in qmp_input_visitor_new (obj=0x7f03223afc50)
    at /home/anthony/git/qemu/qapi/qmp-input-visitor.c:250
#6  0x00007f0320d41469 in object_property_set_qobject (obj=0x7f0322337f00,
    value=<value optimized out>, name=0x7f0320e844ed "ioeventfd",
    errp=0x7fff2beec7b0) at /home/anthony/git/qemu/qom/qom-qobject.c:23
#7  0x00007f0320d404ee in object_property_set_bool (obj=0x7f0322337f00,
    value=<value optimized out>, name=0x7f0320e844ed "ioeventfd",
    errp=0x7fff2beec7b0) at /home/anthony/git/qemu/qom/object.c:729
#8  0x00007f0320d29496 in qdev_prop_set_defaults (dev=0x7f0322337f00,
    props=0x7f03211f0d80) at /home/anthony/git/qemu/hw/qdev-properties.c:1101
#9  0x00007f0320d3f52d in object_init_with_type (obj=0x7f0322337f00,
    ti=0x7f03223130b0) at /home/anthony/git/qemu/qom/object.c:250
#10 0x00007f0320d3f52d in object_init_with_type (obj=0x7f0322337f00,
    ti=0x7f032230c7d0) at /home/anthony/git/qemu/qom/object.c:250
#11 0x00007f0320d3f70d in object_new_with_type (type=0x7f032230c7d0)
    at /home/anthony/git/qemu/qom/object.c:361
#12 0x00007f0320d2adb8 in qdev_try_create (bus=0x7f0322341e10,
    name=0x7f0320e7fa14 "virtio-net-pci")
    at /home/anthony/git/qemu/hw/qdev.c:123
#13 0x00007f0320d2ae29 in qdev_create (bus=0x7f0322341e10,
    name=0x7f0320e7fa14 "virtio-net-pci")
    at /home/anthony/git/qemu/hw/qdev.c:103
#14 0x00007f0320cde89f in pci_create_multifunction (bus=<value optimized out>,
    devfn=-1, multifunction=false, name=<value optimized out>)
    at /home/anthony/git/qemu/hw/pci.c:1541
#15 0x00007f0320cdea0a in pci_nic_init (nd=0x7f03219afc80,
    default_model=<value optimized out>, default_devaddr=<value optimized out>)
    at /home/anthony/git/qemu/hw/pci.c:1391
#16 0x00007f0320cdeade in pci_nic_init_nofail (nd=0x7f03219afc80,
    default_model=0x7f0320e79e67 "e1000", default_devaddr=0x0)
    at /home/anthony/git/qemu/hw/pci.c:1407
#17 0x00007f0320df4ed4 in pc_init1 (system_memory=<value optimized out>,
    system_io=0x7f0321c30000, ram_size=134217728,
    boot_device=0x7fff2beecd40 "cad", kernel_filename=<value optimized out>,
    kernel_cmdline=<value optimized out>,
    initrd_filename=0x7f0321c2e370 ".tmp-11243/initramfs-11243.img.gz",
    cpu_model=0x0, pci_enabled=1, kvmclock_enabled=1)
    at /home/anthony/git/qemu/hw/pc_piix.c:247
#18 0x00007f0320df55a8 in pc_init_pci (ram_size=134217728,
    boot_device=0x7fff2beecd40 "cad",
    kernel_filename=0x7f0321c2e2f0 "bin/vmlinuz-3.0",
    kernel_cmdline=0x7f0321c2e400 "console=ttyS0 seed=57279",
    initrd_filename=0x7f0321c2e370 ".tmp-11243/initramfs-11243.img.gz",
    cpu_model=<value optimized out>) at /home/anthony/git/qemu/hw/pc_piix.c:313
#19 0x00007f0320d04b80 in main (argc=<value optimized out>,
    argv=<value optimized out>, envp=<value optimized out>)
    at /home/anthony/git/qemu/vl.c:3482

Regards,

Anthony Liguori



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