故障分析 | binlog flush 失败导致的 Crash

作者：xuty
开个坑，记录自己平时由于解决问题需要或是兴趣研究进行的 MySQL 源码跟踪学习过程。

一、问题现象

某项目上出现 MySQL Crash，相关 errorlog 日志如下，从日志可以看出是 binlog error 导致的问题，但是无法确认具体原因，网上大部分资料都说是由于空间已满导致，后来在系统日志(/var/log/message)中确实找到了 / 分区空间已满的信息，所以基本可以确认 binlog error 是由于磁盘空间已满导致，进而造成 MySQL Crash。

2019-09-24T14:17:47.786460+08:00 527621 [ERROR] /usr/local/mysql/bin/mysqld: Binary logging not possible. Message: An error occurred during flush stage of the commit. 'binlog_error_action' is set to 'ABORT_SERVER'. Hence aborting the server.
06:17:47 UTC - mysqld got signal 6 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.

key_buffer_size=8388608
read_buffer_size=16777216
max_used_connections=79
max_threads=2500
thread_count=35
connection_count=34
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 122921649 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x7fbc3400ef40
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 7fbcd01d9ea8 thread_stack 0x40000
/usr/local/mysql/bin/mysqld(my_print_stacktrace+0x35)[0xf4fbe5]
/usr/local/mysql/bin/mysqld(handle_fatal_signal+0x4a4)[0x7d1f54]
/lib64/libpthread.so.0(+0xf370)[0x7fc5897fe370]
/lib64/libc.so.6(gsignal+0x37)[0x7fc5881f21d7]
/lib64/libc.so.6(abort+0x148)[0x7fc5881f38c8]
/usr/local/mysql/bin/mysqld[0xee626a]
/usr/local/mysql/bin/mysqld(_ZN13MYSQL_BIN_LOG33handle_binlog_flush_or_sync_errorEP3THDb+0x17b)[0xef289b]
/usr/local/mysql/bin/mysqld(_ZN13MYSQL_BIN_LOG14ordered_commitEP3THDbb+0x3ca)[0xef480a]
/usr/local/mysql/bin/mysqld(_ZN13MYSQL_BIN_LOG6commitEP3THDb+0x51d)[0xef4f7d]
/usr/local/mysql/bin/mysqld(_Z15ha_commit_transP3THDbb+0x174)[0x823434]
/usr/local/mysql/bin/mysqld(_Z12trans_commitP3THD+0x49)[0xdd38f9]
/usr/local/mysql/bin/mysqld(_Z21mysql_execute_commandP3THDb+0x2c89)[0xd1a1a9]
/usr/local/mysql/bin/mysqld(_Z11mysql_parseP3THDP12Parser_state+0x40d)[0xd1c86d]
/usr/local/mysql/bin/mysqld(_Z16dispatch_commandP3THDPK8COM_DATA19enum_server_command+0x11a5)[0xd1da