Magma does not allocate aligned buffers correctly

==311003==ERROR: AddressSanitizer: invalid alignment requested in aligned_alloc: 4096, alignment must be a power of two and the requested size 0x47dabd must be a multiple of alignment (thread T5211 (mg:flusher:2))

    #0 0x7b5f40 in aligned_alloc /tmp/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:113:3

    #1 0x434d212 in cb::SystemArenaMalloc::aligned_alloc(unsigned long, unsigned long) /home/trond/compile/asan/platform/src/system_arena_malloc.cc:148:16

    #2 0x14bf419 in cb::_ArenaMalloc<cb::SystemArenaMalloc>::aligned_alloc(unsigned long, unsigned long) /home/trond/compile/asan/platform/include/platform/cb_arena_malloc.h:242:16

    #3 0x14bf419 in cb_aligned_alloc /home/trond/compile/asan/platform/src/cb_malloc_arena.cc:58:17

    #4 0x473cf2b in magma::Buffer::resize(unsigned long, unsigned long, double) /home/trond/compile/asan/magma/util/buffer.cc:95:24

    #5 0x473d454 in magma::Buffer::Reserve(unsigned long, unsigned long, double, bool) /home/trond/compile/asan/magma/util/buffer.cc

    #6 0x473ddfe in magma::Buffer::Allocate(unsigned long, bool) /home/trond/compile/asan/magma/util/buffer.cc:159:9

    #7 0x471972a in magma::BufferedFileWriter::Write(char const*, unsigned long, bool) /home/trond/compile/asan/magma/util/rw_file.cc:554:23

    #8 0x471afb6 in magma::BufferedFileWriter::Write(folly::IOBuf const&, bool) /home/trond/compile/asan/magma/util/rw_file.cc:528:18

    #9 0x45c1bea in magma::SSTableWriter::writeBlock(folly::IOBuf const&, magma::BlockType, magma::BlockPointer*) /home/trond/compile/asan/magma/lsm/sstable/sstable_writer.cc:362:17

    #10 0x45c0ee0 in magma::SSTableWriter::writeDataBlock(magma::BlockBuilder&) /home/trond/compile/asan/magma/lsm/sstable/sstable_writer.cc:140:14

    #11 0x45c3fa0 in magma::SSTableWriter::AddKV(magma::Slice const&, folly::IOBuf const&, bool) /home/trond/compile/asan/magma/lsm/sstable/sstable_writer.cc:202:17

    #12 0x4620253 in magma::LSMTree::gcOutputCallback::addKV(magma::LSMTree::gcOutputCallback::gcSSTableWriter&, std::pair<magma::Slice, folly::IOBuf>&, magma::Operation) /home/trond/compile/asan/magma/lsm/lsm_tree.cc:835:30

    #13 0x4620610 in magma::LSMTree::gcOutputCallback::operator()(std::pair<magma::Slice, folly::IOBuf>&, magma::Operation) /home/trond/compile/asan/magma/lsm/lsm_tree.cc:861:18

    #14 0x46791a6 in magma::LSMTree::addKVs(magma::KVReader&, magma::LSMTree::gcOutputCallback&, magma::ItemGCFilter&, bool)::$_18::operator()(std::pair<magma::Slice, folly::IOBuf>&, magma::Operation) const /home/trond/compile/asan/magma/lsm/lsm_tree.cc:817:16

    #15 0x46791a6 in magma::Status std::__invoke_impl<magma::Status, magma::LSMTree::addKVs(magma::KVReader&, magma::LSMTree::gcOutputCallback&, magma::ItemGCFilter&, bool)::$_18&, std::pair<magma::Slice, folly::IOBuf>&, magma::Operation>(std::__invoke_other, magma::LSMTree::addKVs(magma::KVReader&, magma::LSMTree::gcOutputCallback&, magma::ItemGCFilter&, bool)::$_18&, std::pair<magma::Slice, folly::IOBuf>&, magma::Operation&&) /opt/gcc-10.2.0/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/bits/invoke.h:60:14

    #16 0x46791a6 in std::enable_if<is_invocable_r_v<magma::Status, magma::LSMTree::addKVs(magma::KVReader&, magma::LSMTree::gcOutputCallback&, magma::ItemGCFilter&, bool)::$_18&, std::pair<magma::Slice, folly::IOBuf>&, magma::Operation>, magma::Status>::type std::__invoke_r<magma::Status, magma::LSMTree::addKVs(magma::KVReader&, magma::LSMTree::gcOutputCallback&, magma::ItemGCFilter&, bool)::$_18&, std::pair<magma::Slice, folly::IOBuf>&, magma::Operation>(magma::LSMTree::addKVs(magma::KVReader&, magma::LSMTree::gcOutputCallback&, magma::ItemGCFilter&, bool)::$_18&, std::pair<magma::Slice, folly::IOBuf>&, magma::Operation&&) /opt/gcc-10.2.0/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/bits/invoke.h:113:9

    #17 0x46791a6 in std::_Function_handler<magma::Status (std::pair<magma::Slice, folly::IOBuf>&, magma::Operation), magma::LSMTree::addKVs(magma::KVReader&, magma::LSMTree::gcOutputCallback&, magma::ItemGCFilter&, bool)::$_18>::_M_invoke(std::_Any_data const&, std::pair<magma::Slice, folly::IOBuf>&, magma::Operation&&) /opt/gcc-10.2.0/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/bits/std_function.h:291:9

    #18 0x45740cf in std::function<magma::Status (std::pair<magma::Slice, folly::IOBuf>&, magma::Operation)>::operator()(std::pair<magma::Slice, folly::IOBuf>&, magma::Operation) const /opt/gcc-10.2.0/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/bits/std_function.h:622:14

    #19 0x4563317 in magma::ItemGCFilter::Process(magma::KVReader::KVStream&, std::function<magma::Status (std::pair<magma::Slice, folly::IOBuf>&, magma::Operation)>, bool) /home/trond/compile/asan/magma/lsm/mvcc.cc:223:22

    #20 0x4620008 in magma::LSMTree::addKVs(magma::KVReader&, magma::LSMTree::gcOutputCallback&, magma::ItemGCFilter&, bool) /home/trond/compile/asan/magma/lsm/lsm_tree.cc:819:15

    #21 0x461f41a in magma::LSMTree::writeSSTable(magma::SSTableWriter&, magma::Iterator*, long, std::function<bool (magma::Slice const&)>) /home/trond/compile/asan/magma/lsm/lsm_tree.cc:887:18

    #22 0x461e4e0 in magma::LSMTree::writeSSTable(bool, magma::Iterator*, unsigned long, long, bool, std::function<bool (magma::Slice const&)>) /home/trond/compile/asan/magma/lsm/lsm_tree.cc:762:17

    #23 0x461b5c0 in magma::LSMTree::writeMemtable(magma::Memtable*, bool)::$_14::operator()(magma::Iterator*) const /home/trond/compile/asan/magma/lsm/lsm_tree.cc:537:17

    #24 0x4619dd4 in magma::LSMTree::writeMemtable(magma::Memtable*, bool) /home/trond/compile/asan/magma/lsm/lsm_tree.cc:570:22

    #25 0x461bfcf in magma::LSMTree::doMemtableFlushWork() /home/trond/compile/asan/magma/lsm/lsm_tree.cc:614:18

    #26 0x4679528 in magma::LSMTree::newFlush()::$_23::operator()() const /home/trond/compile/asan/magma/lsm/lsm_tree.cc:1175:34

    #27 0x4679528 in std::tuple<magma::Status, magma::CheckpointTransaction> std::__invoke_impl<std::tuple<magma::Status, magma::CheckpointTransaction>, magma::LSMTree::newFlush()::$_23&>(std::__invoke_other, magma::LSMTree::newFlush()::$_23&) /opt/gcc-10.2.0/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/bits/invoke.h:60:14

    #28 0x4679528 in std::enable_if<is_invocable_r_v<std::tuple<magma::Status, magma::CheckpointTransaction>, magma::LSMTree::newFlush()::$_23&>, std::tuple<magma::Status, magma::CheckpointTransaction>>::type std::__invoke_r<std::tuple<magma::Status, magma::CheckpointTransaction>, magma::LSMTree::newFlush()::$_23&>(magma::LSMTree::newFlush()::$_23&) /opt/gcc-10.2.0/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/bits/invoke.h:113:9

    #29 0x4679528 in std::_Function_handler<std::tuple<magma::Status, magma::CheckpointTransaction> (), magma::LSMTree::newFlush()::$_23>::_M_invoke(std::_Any_data const&) /opt/gcc-10.2.0/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/bits/std_function.h:291:9

    #30 0x46907d1 in std::function<std::tuple<magma::Status, magma::CheckpointTransaction> ()>::operator()() const /opt/gcc-10.2.0/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/bits/std_function.h:622:14

    #31 0x4618634 in magma::FlushWork::Execute() /home/trond/compile/asan/magma/lsm/flush_work.cc:70:29

    #32 0x465493a in magma::KVStore::executeFlush(std::shared_ptr<magma::FlushWork>, std::shared_ptr<magma::FlushWork>, std::shared_ptr<magma::FlushWork>, magma::KVStore::bulkLoadArgs) /home/trond/compile/asan/magma/magma/kvstore/kvstore.cc:661:23

    #33 0x4655e4e in magma::KVStore::flushMemTables(magma::WAL*, magma::WALOffset, magma::KVStore::FlushMode, magma::BlockingMode, magma::KVStore::bulkLoadArgs)::$_55::operator()() /home/trond/compile/asan/magma/magma/kvstore/kvstore.cc:845:19

    #34 0x46815b1 in magma::Status std::__invoke_impl<magma::Status, magma::KVStore::flushMemTables(magma::WAL*, magma::WALOffset, magma::KVStore::FlushMode, magma::BlockingMode, magma::KVStore::bulkLoadArgs)::$_55&>(std::__invoke_other, magma::KVStore::flushMemTables(magma::WAL*, magma::WALOffset, magma::KVStore::FlushMode, magma::BlockingMode, magma::KVStore::bulkLoadArgs)::$_55&) /opt/gcc-10.2.0/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/bits/invoke.h:60:14

    #35 0x46815b1 in std::enable_if<is_invocable_r_v<void, magma::KVStore::flushMemTables(magma::WAL*, magma::WALOffset, magma::KVStore::FlushMode, magma::BlockingMode, magma::KVStore::bulkLoadArgs)::$_55&>, void>::type std::__invoke_r<void, magma::KVStore::flushMemTables(magma::WAL*, magma::WALOffset, magma::KVStore::FlushMode, magma::BlockingMode, magma::KVStore::bulkLoadArgs)::$_55&>(magma::KVStore::flushMemTables(magma::WAL*, magma::WALOffset, magma::KVStore::FlushMode, magma::BlockingMode, magma::KVStore::bulkLoadArgs)::$_55&) /opt/gcc-10.2.0/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/bits/invoke.h:110:2

    #36 0x46815b1 in std::_Function_handler<void (), magma::KVStore::flushMemTables(magma::WAL*, magma::WALOffset, magma::KVStore::FlushMode, magma::BlockingMode, magma::KVStore::bulkLoadArgs)::$_55>::_M_invoke(std::_Any_data const&) /opt/gcc-10.2.0/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/bits/std_function.h:291:9

    #37 0x46e0844 in magma::TimedTask::Complete(bool) /home/trond/compile/asan/magma/util/worker.cc

    #38 0x46e0b8d in magma::TaskWorker::loop(void*) /home/trond/compile/asan/magma/util/worker.cc:180:19 

if (alignBoundary > 1) {

        Expects(alignBoundary % 2 == 0);

        newOwnership = cb_aligned_alloc(alignBoundary, newCap);

        isAligned = true;

    } else {

        newOwnership = cb_malloc(newCap);

        isAligned = false;

    }

    if (preserve) {

        std::copy(data, data + preserve, (char*)newOwnership);

    }