Segfault caused by outputstream being null. #335
Description
It appears that the output stream is getting set to a nullptr. Was running v2.5.0 of the client. When I rolled-back to v2.4.0 of the client, the issue is no longer present. This issue shows up the first time I call Client::Insert() for each client instance. It's not clear what I am doing on the application side to cause this. Any thoughts as to how I can debug this?
My client is configured in the following manner:
m_client = std::make_shared<clickhouse::Client>(
clickhouse::ClientOptions().SetHost(host) // a hostname
.SetPingBeforeQuery(client_config.ping_before_query) // true
.SetSendRetries(client_config.send_retries) // 0
.SetCompressionMethod(compression_method) // None
.SetRetryTimeout(std::chrono::seconds(client_config.retry_timeout_sec)) // 0
.TcpKeepAlive(client_config.tcp_keep_alive) // true
.SetConnectionConnectTimeout(std::chrono::seconds(client_config.connect_timeout_sec)) // 5
.SetConnectionRecvTimeout(std::chrono::milliseconds(client_config.recv_timeout_ms)) // 1000000
.SetConnectionSendTimeout(std::chrono::milliseconds(client_config.send_timeout_ms)) // 60000
);
Stack trace and gdb debugging
Thread 5 "rte-worker-8" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffc5c87000 (LWP 136)]
clickhouse::WireFormat::WriteAll (output=..., buf=<optimized out>, len=1) at /git/submodules/clickhouse-cpp/clickhouse/base/wire_format.cpp:36
36 /git/submodules/clickhouse-cpp/clickhouse/base/wire_format.cpp: No such file or directory.
(gdb) bt
#0 clickhouse::WireFormat::WriteAll (output=..., buf=<optimized out>, len=1) at /git/submodules/clickhouse-cpp/clickhouse/base/wire_format.cpp:36
#1 0x0000555559dce5c1 in clickhouse::WireFormat::WriteVarint64 (output=..., value=<optimized out>, value@entry=1) at /git/submodules/clickhouse-cpp/clickhouse/base/wire_format.cpp:86
#2 0x0000555559dc7fcf in clickhouse::WireFormat::WriteUInt64 (value=1, output=...) at /git/submodules/clickhouse-cpp/clickhouse/base/wire_format.h:74
#3 clickhouse::Client::Impl::SendQuery (this=0x7fffb8001460, query=...) at /git/submodules/clickhouse-cpp/clickhouse/client.cpp:720
#4 0x0000555559dc9477 in clickhouse::Client::Impl::Insert (this=0x7fffb8001460, table_name=..., query_id="", block=...) at /git/submodules/clickhouse-cpp/clickhouse/client.cpp:311
(gdb) frame 0
#0 clickhouse::WireFormat::WriteAll (output=..., buf=<optimized out>, len=1) at /git/submodules/clickhouse-cpp/clickhouse/base/wire_format.cpp:36
36 /git/submodules/clickhouse-cpp/clickhouse/base/wire_format.cpp: No such file or directory.
(gdb) info locals
original_len = 1
p = 0x7fffc5c2cb9e "\001"
written_previously = 1
(gdb) p output
$4 = (clickhouse::OutputStream &) <error reading variable>
(gdb) p &output
$5 = (clickhouse::OutputStream *) 0x0