我的环境： Ubutnu服务器18.04 64位 PHP 7.2.2 ZTS无调试
以多线程模式运行的脚本。每个脚本都有自己的CkImap对象。
我无法提供完整的脚本代码，但没有什么不寻常的：通过ssh隧道与imap进行通信。像这样：
$this->imap->put_ConnectTimeout(10);
$this->imap->put_Ssl(true);
$this->imap->put_PeekMode(true);
$this->imap->put_Utf8(true);
$this->imap->SshOpenTunnel($proxy->ip, $proxy->port);
$this->imap->SshAuthenticatePw($proxy->username,$proxy->password);
$this->imap->Connect($account->imap_server);
$this->imap->login($account->email, $account->password);
$this->imap->Disconnect();
$this->imap->SshCloseTunnel();
有时它会因thread 42 "php" received signal SIGPIPE, Broken pipe.
似乎在尝试关闭imap连接或关闭sshTunnel时会崩溃。
我试图重现该错误，但没有走运。试图两次致电imap->Disconnect()和imap->SshCloseTunnel()，但没有走运，也没有错误。
完整的核心回溯是：
Thread 42 "php" received signal SIGPIPE, Broken pipe.
[Switching to Thread 0x7fff279ff700 (LWP 46139)]
0x00007ffff5ea89ae in __libc_send (fd=169, buf=0x7fff642f5ba0, len=36,
flags=0) at ../sysdeps/unix/sysv/linux/send.c:28
28 ../sysdeps/unix/sysv/linux/send.c: No such file or directory.
(gdb) bt
#0 0x00007ffff5ea89ae in __libc_send (fd=169, buf=0x7fff642f5ba0, len=36,
flags=0) at ../sysdeps/unix/sysv/linux/send.c:28
#1 0x00007fffeb919236 in ChilkatSocket::sockSend(unsigned char const*, unsigned int, unsigned int, bool, bool, unsigned int, unsigned int&, LogBase&, SocketParams&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#2 0x00007fffeb919610 in ChilkatSocket::tcpSendBytes(DataBuffer const&, unsigned int, bool, bool, unsigned int, unsigned int&, LogBase&, SocketParams&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#3 0x00007fffebab42a9 in TlsEndpoint::tlsSendBytes(DataBuffer const&, unsigned int, bool, unsigned int, unsigned int&, LogBase&, SocketParams&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#4 0x00007fffeba8ac44 in SshTransport::sendMessageInOnePacket(char const*, char const*, DataBuffer&, unsigned int&, SocketParams&, LogBase&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#5 0x00007fffeba91648 in SshTransport::channelSendClose2(unsigned int, SocketParams&, LogBase&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#6 0x00007fffeba97af6 in SshTransport::closeChannel(unsigned int, bool&, SshReadParams&, SocketParams&, LogBase&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#7 0x00007fffeba78723 in Socket2::sshCloseChannel(SshReadParams&, SocketParams&, LogBase&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#8 0x00007fffebab4c15 in TlsEndpoint::sshCloseChannel(SshReadParams&, SocketParams&, LogBase&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#9 0x00007fffebb5c65f in SChannelChilkat::sshCloseChannel(SshReadParams&, SocketParams&, LogBase&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
---Type <return> to continue, or q <return> to quit---
#10 0x00007fffeba787db in Socket2::sshCloseChannel(SshReadParams&, SocketParams&, LogBase&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#11 0x00007fffeba7947a in Socket2::sockClose(bool, bool, unsigned int, LogBase&, ProgressMonitor*, bool) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#12 0x00007fffeb9cc60b in _ckImap::handleSocketFailure() ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#13 0x00007fffeb9cc928 in _ckImap::getServerResponseLine2(StringBuffer&, LogBase&, SocketParams&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#14 0x00007fffeb9cd104 in _ckImap::getCompleteResponse(char const*, ExtPtrArraySb&, LogBase&, SocketParams&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#15 0x00007fffeb9cf749 in _ckImap::cmdNoArgs(char const*, ImapResultSet&, LogBase&, SocketParams&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#16 0x00007fffeb79bc59 in ClsImap::closeMailbox(XString&, SocketParams&, LogBase&) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#17 0x00007fffeb7a07ae in ClsImap::CloseMailbox(XString&, ProgressEvent*)
()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#18 0x00007fffeb66739d in CkImap::CloseMailbox(char const*) ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#19 0x00007fffeb39aedd in _wrap_CkImap_CloseMailbox ()
from /etc/php7/lib/php/extensions/no-debug-zts-20170718/chilkat_9_5_0.so
#20 0x0000555555c41b13 in ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER ()
at /var/www/interceptor/php-src-php-7.2.2/Zend/zend_vm_execute.h:1032
#21 execute_ex (ex=0xa9)
at /var/www/interceptor/php-src-php-7.2.2/Zend/zend_vm_execute.h:59752
---Type <return> to continue, or q <return> to quit---
#22 0x00007fffeac4ba15 in pthreads_execute_ex (data=<optimized out>)
at /var/www/interceptor.cmd.source/pthreads/php_pthreads.c:135
#23 0x0000555555c3fb5c in ZEND_DO_FCALL_SPEC_RETVAL_UNUSED_HANDLER ()
at /var/www/interceptor/php-src-php-7.2.2/Zend/zend_vm_execute.h:888
#24 execute_ex (ex=0xa9)
at /var/www/interceptor/php-src-php-7.2.2/Zend/zend_vm_execute.h:59749
#25 0x00007fffeac4ba15 in pthreads_execute_ex (data=<optimized out>)
at /var/www/interceptor.cmd.source/pthreads/php_pthreads.c:135
#26 0x0000555555c3fb5c in ZEND_DO_FCALL_SPEC_RETVAL_UNUSED_HANDLER ()
at /var/www/interceptor/php-src-php-7.2.2/Zend/zend_vm_execute.h:888
#27 execute_ex (ex=0xa9)
at /var/www/interceptor/php-src-php-7.2.2/Zend/zend_vm_execute.h:59749
#28 0x00007fffeac4ba15 in pthreads_execute_ex (data=<optimized out>)
at /var/www/interceptor.cmd.source/pthreads/php_pthreads.c:135
#29 0x0000555555c3fb5c in ZEND_DO_FCALL_SPEC_RETVAL_UNUSED_HANDLER ()
at /var/www/interceptor/php-src-php-7.2.2/Zend/zend_vm_execute.h:888
#30 execute_ex (ex=0xa9)
at /var/www/interceptor/php-src-php-7.2.2/Zend/zend_vm_execute.h:59749
#31 0x00007fffeac4ba15 in pthreads_execute_ex (data=<optimized out>)
at /var/www/interceptor.cmd.source/pthreads/php_pthreads.c:135
#32 0x0000555555b7365b in zend_call_function (
fci=fci@entry=0x7fff279feba0, fci_cache=0x7fff1c9c53a0,
fci_cache@entry=0x7fff279febd8)
at /var/www/interceptor/php-src-php-7.2.2/Zend/zend_execute_API.c:819
#33 0x00007fffeac49232 in pthreads_routine_run_function (
object=object@entry=0x7fffe9f447e0, connection=0x7fff26a68700,
work=work@entry=0x7fff279fed00)
at /var/www/interceptor.cmd.source/pthreads/src/object.c:481
#34 0x00007fffeac56aec in pthreads_routine (routine=<optimized out>)
at /var/www/interceptor.cmd.source/pthreads/src/object.c:516
#35 0x00007ffff5e9e6db in start_thread (arg=0x7fff279ff700)
---Type <return> to continue, or q <return> to quit---
at pthread_create.c:463
#36 0x00007ffff3d3688f in clone ()
at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
如何避免呢？我只是想在PHP上处理信号，但我不想这样做。 Chilkat有某种避免的方法吗？