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See all on GitHub →We (slack) have been seeing a very slow trickle of segfaults from code paths in the cleanup timer in our production environment. This issue is not new, it's been occurring for a while. I do not yet have a repro for these segfaults. Relevant version of squangle we are running: There are two unique stack traces we see. The first is more frequent and appears to occur on a call to std::unordered_map::erase(): 0:string"raise at ../sysdeps/unix/sysv/linux/raise.c:51" 1:string"HPHP::bt_handler at /build/hhvm/hphp/runtime/base/crash-reporter.cpp:270" 2:string"facebook::common::mysql_client::AsyncMysqlClient::activeConnectionRemoved at /build/hhvm/third-party/squangle/src/squangle/mysql_client/AsyncMysqlClient.h:357" 3:string"facebook::common::mysql_client::MysqlConnectionHolder::~MysqlConnectionHolder at /build/hhvm/third-party/squangle/squangle/mysql_client/Connection.cpp:63" 4:string"facebook::common::mysql_client::MysqlConnectionHolder::~MysqlConnectionHolder at /build/hhvm/third-party/squangle/squangle/mysql_client/Connection.cpp:64" 5:string"std::default_delete::operator() at /usr/include/c++/7/bits/unique_ptr.h:78" 6:string"std::unique_ptr::operator() at /build/hhvm/third-party/squangle/squangle/mysql_client/AsyncMysqlClient.cpp:80" 17:string"std::__invoke_impl at /usr/include/c++/7/bits/invoke.h:95" 19:string"std::thread::_Invoker at /usr/include/c++/7/thread:234" 20:string"std::thread::_Invoker at /usr/include/c++/7/thread:243" 21:string"std::thread::_State_impl at /usr/include/c++/7/thread:186" 22:string"start_thread at pthread_create.c:463" 23:string"clone at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95" new AsyncMysqlConnectionPool(darray[ 'per_key_connection_limit' => 20, 'idle_timeout_micros' => 4000000, 'expiration_policy' => "IdleTime", ]); ```
Recent fixes
It would be useful for userland Hack code in Slack to determine whether a connection obtained via an HHVM async_mysql connection pool was recycled from the pool or freshly opened, to allow more granular instrumentation than what pool-level stats currently provide. See https://github.com/facebook/hhvm/issues/8013 for the full rationale. Add two new connection fields that expose this information. A followup diff will expose these to HHVM/Hack.
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Repository: facebook/squangle. Description: SQuangLe is a C++ API for accessing MySQL servers Stars: 127, Forks: 54. Primary language: C++. Languages: C++ (99.9%), C (0.1%). Open PRs: 0, open issues: 2. Last activity: 2d ago. Community health: 75%. Top contributors: jkedgar, abal147, drilibo, aditya-jalan, jrahman-zz, yfeldblum, sarangbh, maxgeorg, r-barnes, jtwarren and others.