Re: [Qemu-devel] [PATCH v2 7/7] iotests: new file to suppress Valgrind errors

[Andrey Shinkevich]

On 13/06/2019 13:06, Vladimir Sementsov-Ogievskiy wrote:
> 11.06.2019 21:02, Andrey Shinkevich wrote:
>> The Valgrind tool reports about an uninitialised memory usage when the
>> initialization is actually not needed. For example, the buffer 'buf'
>> instantiated on a stack of the function guess_disk_lchs().
> 
> for convinience, you may add: "of the function guess_disk_lchs(), which
> is then actually initialized by blk_pread_unthrottled()"
> 
>> Let's use the Valgrind technology to suppress the unwanted reports by
>> adding the Valgrind specific format file valgrind.supp to the QEMU
>> project. The file content is extendable for future needs.
>>
>> Signed-off-by: Andrey Shinkevich <address@hidden>
>> ---
>>    tests/qemu-iotests/common.rc     |  5 ++++-
>>    tests/qemu-iotests/valgrind.supp | 31 +++++++++++++++++++++++++++++++
>>    2 files changed, 35 insertions(+), 1 deletion(-)
>>    create mode 100644 tests/qemu-iotests/valgrind.supp
>>
>> diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
>> index 3caaca4..9b74890 100644
>> --- a/tests/qemu-iotests/common.rc
>> +++ b/tests/qemu-iotests/common.rc
>> @@ -17,6 +17,8 @@
>>    # along with this program.  If not, see <http://www.gnu.org/licenses/>.
>>    #
>>    
>> +readonly VALGRIND_SUPPRESS_ERRORS=./valgrind.supp
> 
> Why readonly?
> 
> I think it should be defined near and in same manner as VALGRIND_LOGFILE,
> with use of TEST_DIR
> 

The new file 'valgrind.supp' is intended to be a part of the QEMU 
project. So, it will be located in the test directory tests/qemu-iotests.
The variable TEST_DIR may change the working directory. In that case, 
moving the project file will be a hassle.

Andrey

>> +
>>    SED=
>>    for sed in sed gsed; do
>>        ($sed --version | grep 'GNU sed') > /dev/null 2>&1
>> @@ -65,7 +67,8 @@ _qemu_proc_wrapper()
>>        local VALGRIND_LOGFILE="$1"
>>        shift
>>        if [ "${VALGRIND_QEMU}" == "y" ]; then
>> -        exec valgrind --log-file="${VALGRIND_LOGFILE}" --error-exitcode=99 
>> "$@"
>> +        exec valgrind --log-file="${VALGRIND_LOGFILE}" --error-exitcode=99 \
>> +            --suppressions="${VALGRIND_SUPPRESS_ERRORS}" "$@"
>>        else
>>            exec "$@"
>>        fi
>> diff --git a/tests/qemu-iotests/valgrind.supp 
>> b/tests/qemu-iotests/valgrind.supp
>> new file mode 100644
>> index 0000000..78215b6
>> --- /dev/null
>> +++ b/tests/qemu-iotests/valgrind.supp
>> @@ -0,0 +1,31 @@
>> +#
>> +# Valgrind errors suppression file for QEMU iotests
>> +#
>> +# Copyright (c) 2019 Virtuozzo International GmbH
>> +#
>> +# This program is free software; you can redistribute it and/or modify
>> +# it under the terms of the GNU General Public License as published by
>> +# the Free Software Foundation; either version 2 of the License, or
>> +# (at your option) any later version.
>> +#
>> +# This program is distributed in the hope that it will be useful,
>> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
>> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> +# GNU General Public License for more details.
>> +#
>> +# You should have received a copy of the GNU General Public License
>> +# along with this program.  If not, see <http://www.gnu.org/licenses/>.
>> +#
>> +{
>> +   hw/block/hd-geometry.c
>> +   Memcheck:Cond
>> +   fun:guess_disk_lchs
>> +   fun:hd_geometry_guess
>> +   fun:blkconf_geometry
>> +   ...
>> +   fun:device_set_realized
>> +   fun:property_set_bool
>> +   fun:object_property_set
>> +   fun:object_property_set_qobject
>> +   fun:object_property_set_bool
>> +}
>>
> 
> 

-- 
With the best regards,
Andrey Shinkevich