当将作业推入 beanstalkd 队列并且 beanstalkd 开始工作时，它会抛出一个错误说：
[Symfony\Component\Process\Exception\RuntimeException] 进程已收到信号“11”。
/etc/syslog/beantstalkd：
# System configuration for the beanstalkd daemon
# Available options correspond to the options to the
# beanstalkd commandline.
BEANSTALKD_ADDR=0.0.0.0
BEANSTALKD_PORT=11300
BEANSTALKD_USER=beanstalkd
# Job size is left to the default. Uncomment and set it
# to a value to have it take affect.
#BEANSTALKD_MAX_JOB_SIZE=65535
# Using the binlog is off by default.
#
# The direcory to house the binlog.
BEANSTALKD_BINLOG_DIR=/var/log/beanstalkd/binlog
#
# fsync the binlog at most once every N milliseconds.
# setting this to 0 means 'always fsync'. If this is unset,
# and the binlog is used, then no explicit fsync is ever
# performed. That is, the -F option is used.
#BEANSTALKD_BINLOG_FSYNC_PERIOD=
#
# The size of each binlog file. This is rounded
# up to the nearest 512 byte boundary.
#BEANSTALKD_BINLOG_SIZE=10485760
做什么
该过程已通过信号“11”发出信号。
究竟是什么意思？