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CONC-534 memory leak in ps_bugs.c
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Do not resend metadata, if metadata does not change between prepare and
execute of prepared statement, or between executes.
Currently, metadata of *every* prepared statement will be checksummed,
and change is detected once checksum changes.
This is not from ideal, performance-wise. The code for
better/faster detection of unchanged metadata, is already in place, but
currently disabled due to PS bugs, such as MDEV-23913.
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This follows up commit
commit 94a520ddbe39ae97de1135d98699cf2674e6b77e and
commit 7c5519c12d46ead947d341cbdcbb6fbbe4d4fe1b.
After these changes, the default test suites on a
cmake -DWITH_UBSAN=ON build no longer fail due to passing
null pointers as parameters that are declared to never be null,
but plenty of other runtime errors remain.
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Some GSS-API functions like gss_import_name(), gss_release_buffer()
used in plugin/auth_gssapi and libmariadb/plugins/auth are marked
as deprecated in MacOS starting from version 10.14+. It results in
extra warnings output on server building.
To eliminate extra warnings the flag '-Wno-deprecated-declarations'
has been added to compiler invocation string for those source
files that invoke deprecated GSS-API functions.
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This fixes GCC 10.0.1 -Wstringop-truncation and some typos.
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tests for --ssl-verify-server-cert with system CA
and with incorrect hostname
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check failed
Enable CRL checking on Windows.
Enable certificate verification testing in client testing.
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MemorySanitizer is a compile-time instrumentation layer in clang and GCC.
Together with AddressSanitizer mostly makes the run-time instrumentation
of Valgrind redundant. It is a little more tricky to set up, because
running with uninstrumented libraries will lead into false positives.
You will need an instrumented libc++, and you should use
-stdlib=libc++ instead of the default libstdc++. To build the
instrumented library, you can refer to
https://github.com/google/sanitizers/wiki/MemorySanitizerLibcxxHowTo
or you can adapt these steps that worked for me, for clang-8 version 8.0.1:
cd /mariadb
sudo apt source libc++-8-dev
cd llvm-toolchain-8-8.0.1
mkdir libc++msan; cd libc++msan
cmake ../libcxx -DCMAKE_BUILD_TYPE=Release -DLLVM_USE_SANITIZER=Memory \
-DCMAKE_C_COMPILER=clang-8 -DCMAKE_CXX_COMPILER=clang++-8
Then, in your MariaDB build directory, you have to compile with
libc++ and bundled libraries, such as WITH_SSL=bundled, WITH_ZLIB=bundled.
For uninstrumented system libraries, you will get false positives for
uninitialized values. Like this:
cmake -DWITH_MSAN=ON -DWITH_SSL=bundled -DWITH_ZLIB=bundled \
-DCMAKE_CXX_FLAGS='-stdlib=libc++' ..
Note: you should also add -O2 to the compiler options, or you may
get crashes due to stack overflow.
Finally, to run tests, you must replace libc++ with the instrumented one:
LD_LIBRARY_PATH=/mariadb/llvm-toolchain-8-8.0.1/libc++msan/lib \
MSAN_OPTIONS=abort_on_error=1 \
./mtr --big-test --parallel=auto --force --retry=0
Failure to do so will report numerous false positives related to
operations on std::string and the like.
This is work in progress. Some issues will still have to be fixed
for WITH_MSAN to be usable. See MDEV-20377 for details.
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fixes memory leaks in restart_mysqld.inc tests
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update the test to the new (correct) result
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