Re: [Qemu-devel] [PATCH v28 00/33] replace QEMUOptionParameter with QemuOpts

[Peter Lieven <lieven-lists@dlhnet.de>]

On 05.06.2014 11:20, Chunyan Liu wrote:
> This patch series is to replace QEMUOptionParameter with QemuOpts, so that only
> one Qemu Option structure is kept in QEMU code.
>
> ---
> Changes to v27:
>    * rebase to git master (code has been updated in this part since v27 sent
>      so rebase to make the patch series work.)
>
> All patches are also available from:
> https://github.com/chunyanliu/qemu/commits/QemuOpts
>
>
> Chunyan Liu (33):
>    QemuOpts: move find_desc_by_name ahead for later calling
>    QemuOpts: repurpose qemu_opts_print to replace
>      print_option_parameters
>    QemuOpts: add def_value_str to QemuOptDesc
>    qapi: output def_value_str when query command line options
>    QemuOpts: change opt->name|str from (const char *) to (char *)
>    QemuOpts: move qemu_opt_del ahead for later calling
>    QemuOpts: add qemu_opt_get_*_del functions for replace work
>    QemuOpts: add qemu_opts_print_help to replace print_option_help
>    QemuOpts: add conversion between QEMUOptionParameter to QemuOpts
>    QemuOpts: add qemu_opts_append to replace append_option_parameters
>    QemuOpts: check NULL input for qemu_opts_del
>    change block layer to support both QemuOpts and QEMUOptionParamter
>    vvfat.c: handle cross_driver's create_options and create_opts
>    cow.c: replace QEMUOptionParameter with QemuOpts
>    gluster.c: replace QEMUOptionParameter with QemuOpts
>    iscsi.c: replace QEMUOptionParameter with QemuOpts
>    nfs.c: replace QEMUOptionParameter with QemuOpts
>    qcow.c: replace QEMUOptionParameter with QemuOpts
>    QemuOpts: export qemu_opt_find
>    qcow2.c: replace QEMUOptionParameter with QemuOpts
>    qed.c: replace QEMUOptionParameter with QemuOpts
>    raw-posix.c: replace QEMUOptionParameter with QemuOpts
>    raw-win32.c: replace QEMUOptionParameter with QemuOpts
>    raw_bsd.c: replace QEMUOptionParameter with QemuOpts
>    rbd.c: replace QEMUOptionParameter with QemuOpts
>    sheepdog.c: replace QEMUOptionParameter with QemuOpts
>    ssh.c: replace QEMUOptionParameter with QemuOpts
>    vdi.c: replace QEMUOptionParameter with QemuOpts
>    vhdx.c: replace QEMUOptionParameter with QemuOpts
>    vmdk.c: replace QEMUOptionParameter with QemuOpts
>    vpc.c: replace QEMUOptionParameter with QemuOpts
>    cleanup QEMUOptionParameter
>    QemuOpts: cleanup tmp 'allocated' member from QemuOptsList
>
>   block.c                    |  99 ++++----
>   block/cow.c                |  52 ++--
>   block/gluster.c            |  73 +++---
>   block/iscsi.c              |  32 ++-
>   block/nfs.c                |  10 +-
>   block/qcow.c               |  72 +++---
>   block/qcow2.c              | 259 ++++++++++----------
>   block/qed.c                | 112 +++++----
>   block/qed.h                |   3 +-
>   block/raw-posix.c          |  55 ++---
>   block/raw-win32.c          |  38 +--
>   block/raw_bsd.c            |  25 +-
>   block/rbd.c                |  61 +++--
>   block/sheepdog.c           | 105 ++++----
>   block/ssh.c                |  30 ++-
>   block/vdi.c                |  71 +++---
>   block/vhdx.c               |  97 ++++----
>   block/vhdx.h               |   1 +
>   block/vmdk.c               | 121 +++++-----
>   block/vpc.c                |  60 ++---
>   block/vvfat.c              |  14 +-
>   include/block/block.h      |   7 +-
>   include/block/block_int.h  |   9 +-
>   include/qemu/option.h      |  53 +---
>   include/qemu/option_int.h  |   4 +-
>   qapi-schema.json           |   5 +-
>   qapi/opts-visitor.c        |  10 +-
>   qemu-img.c                 |  91 ++++---
>   qmp-commands.hx            |   2 +
>   tests/qemu-iotests/049.out |   2 +-
>   tests/qemu-iotests/061.out |   2 +-
>   util/qemu-config.c         |   4 +
>   util/qemu-option.c         | 590 ++++++++++++++++++++-------------------------
>   33 files changed, 1037 insertions(+), 1132 deletions(-)
>

It seems that for qemu-img this series introduces stack corruption. Any ideas?

lieven@lieven-pc:~/git/qemu$ valgrind --leak-check=full ./qemu-img convert -p nfs://172.21.200.61/vcore-dev-cdrom/pool3/VC_Ubuntu_LTS_12.04.2_64bit.qcow2 /tmp/x.raw
==23086== Memcheck, a memory error detector
==23086== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==23086== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==23086== Command: ./qemu-img convert -p nfs://172.21.200.61/vcore-dev-cdrom/pool3/VC_Ubuntu_LTS_12.04.2_64bit.qcow2 /tmp/x.raw
==23086==
==23086== Warning: client switching stacks?  SP change: 0x7650f08 --> 0x7feffe9f0
==23086==          to suppress, use: --max-stackframe=34218892008 or greater
==23086== Invalid write of size 8
==23086==    at 0x1C4980: qemu_opts_create (qemu-option.c:692)
==23086==    by 0x119918: img_convert (qemu-img.c:1385)
==23086==    by 0x11CEEC: main (qemu-img.c:2830)
==23086==  Address 0x7c65fe8 is 24 bytes inside a block of size 104 free'd
==23086==    at 0x4C2B7B2: realloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==23086==    by 0x54C1AF6: g_realloc (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.4)
==23086==    by 0x1C5C52: qemu_opts_append (qemu-option.c:1129)
==23086==    by 0x1198EE: img_convert (qemu-img.c:1383)
==23086==    by 0x11CEEC: main (qemu-img.c:2830)
==23086==


Peter