Uninitialized bytes in NInterconnect::TStreamSocket::WriteV

[iddqdex]

выявлено memory санитайзером при прогоне, все упавшие тесты.

E   Uninitialized bytes in read_iovec at offset 18 inside [0x7fc1d7bc51c0, 26)
E   ==55183==WARNING: MemorySanitizer: use-of-uninitialized-value
E   #0 0x1718afbd in writev /-S/contrib/libs/clang18-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc:1157:16
E   #1 0x3acfeac5 in NInterconnect::TStreamSocket::WriteV(iovec const*, int) const /-S/ydb/library/actors/interconnect/interconnect_stream.cpp:135:26
E   #2 0x3ad93f62 in NActors::TInterconnectSessionTCP::Write(NInterconnect::TOutgoingStreamT<262144ul>&, NInterconnect::TStreamSocket&, unsigned long) /-S/ydb/library/actors/interconnect/interconnect_tcp_session.cpp:731:36
E   #3 0x3ad93560 in NActors::TInterconnectSessionTCP::WriteData()::$_0::operator()(NInterconnect::TOutgoingStreamT<262144ul>&, TIntrusivePtr<NInterconnect::TStreamSocket, TDefaultIntrusivePtrOps<NInterconnect::TStreamSocket>> const&, TIntrusivePtr<NActors::TPollerToken, TDefaultIntrusivePtrOps<NActors::TPollerToken>> const&, bool*, unsigned long) const /-S/ydb/library/actors/interconnect/interconnect_tcp_session.cpp:608:43
E   #4 0x3ad9005d in NActors::TInterconnectSessionTCP::WriteData() /-S/ydb/library/actors/interconnect/interconnect_tcp_session.cpp:652:30
E   #5 0x3ad8a82d in NActors::TInterconnectSessionTCP::GenerateTraffic() /-S/ydb/library/actors/interconnect/interconnect_tcp_session.cpp:415:13
E   #6 0x3ad8ee1b in NActors::TInterconnectSessionTCP::HandleRam(TAutoPtr<NActors::TEventHandle<NActors::TInterconnectSessionTCP::TEvRam>, TDelete>&) /-S/ydb/library/actors/interconnect/interconnect_tcp_session.cpp:391:13
E   #7 0x3ad7236d in NActors::TInterconnectSessionTCP::StateFunc(TAutoPtr<NActors::IEventHandle, TDelete>&) /-S/ydb/library/actors/interconnect/interconnect_tcp_session.h:447:13
E   #8 0x196e6a88 in NActors::TGenericExecutorThread::Execute(NActors::TMailbox*, bool) /-S/ydb/library/actors/core/executor_thread.cpp:281:28
E   #9 0x196f0654 in NActors::TGenericExecutorThread::ProcessExecutorPool(NActors::IExecutorPool*)::$_0::operator()(NActors::TMailbox*, bool) const /-S/ydb/library/actors/core/executor_thread.cpp:475:39
E   #10 0x196efa87 in NActors::TGenericExecutorThread::ProcessExecutorPool(NActors::IExecutorPool*) /-S/ydb/library/actors/core/executor_thread.cpp:529:13
E   #11 0x196f1bbf in NActors::TExecutorThread::ThreadProc() /-S/ydb/library/actors/core/executor_thread.cpp:560:9
E   #12 0x1748a0c3 in (anonymous namespace)::TPosixThread::ThreadProxy(void*) /-S/util/system/thread.cpp:244:20
E   #13 0x7fc21c8dbac2  (/lib/x86_64-linux-gnu/libc.so.6+0x94ac2) (BuildId: 490fef8403240c91833978d494d39e537409b92e)
E   #14 0x7fc21c96d84f  (/lib/x86_64-linux-gnu/libc.so.6+0x12684f) (BuildId: 490fef8403240c91833978d494d39e537409b92e)```

[alexvru]

Дубликат #15030