我们在使用 gdb 跟踪日志时遇到了一个问题。当 XMLRPC 调用和 gdb 回溯显示时系统崩溃：
Program terminated with signal 11, Segmentation fault.
#0 finishCurlMulti (envP=0x0, curlMultiP=0xe37b800, timeoutType=timeout_no,
deadline=..., interruptP=0x0) at xmlrpc_curl_transport.c:572
warning: Source file is more recent than executable.
572
(gdb) bt
#0 finishCurlMulti (envP=0x0, curlMultiP=0xe37b800, timeoutType=timeout_no,
deadline=..., interruptP=0x0) at xmlrpc_curl_transport.c:572
#1 0x00002b84f0b4ad24 in performCurlTransaction (envP=0x46a185d0,
clientTransportP=0xe365d50, serverP=<value optimized out>,
callXmlP=<value optimized out>, responseXmlPP=0x46a185e8)
at xmlrpc_curl_transport.c:1036
#2 performRpc (envP=0x46a185d0, clientTransportP=0xe365d50,
serverP=<value optimized out>, callXmlP=<value optimized out>,
responseXmlPP=0x46a185e8) at xmlrpc_curl_transport.c:1141
#3 call (envP=0x46a185d0, clientTransportP=0xe365d50,
serverP=<value optimized out>, callXmlP=<value optimized out>,
responseXmlPP=0x46a185e8) at xmlrpc_curl_transport.c:1362
===> 有空指针错误吗？环境=0x0
-------------------------------------跟踪帧 1---------- ----------
(gdb) frame 1
#1 0x00002b84f0b4ad24 in performCurlTransaction (envP=0x46a185d0, clientTransportP=0xe365d50, serverP=<value optimized out>, callXmlP=<value optimized out>,
responseXmlPP=0x46a185e8) at xmlrpc_curl_transport.c:1036
1036 synchronous RPC can be in progress is for the 'perform' method
(gdb) print envP
$1 = <value optimized out>
(gdb) info registers
rax 0x0 0
rbx 0xec59270 247829104
rcx 0x0 0
rdx 0x2 2
rsi 0x46a18200 1184989696
rdi 0xe37b800 238532608
rbp 0x46a185d0 0x46a185d0
rsp 0x46a184e0 0x46a184e0
r8 0x46a17f00 1184988928
r9 0x46a17ef0 1184988912
r10 0x46a18100 1184989440
r11 0x206 518
r12 0xe365d50 238443856
r13 0xe37b800 238532608
r14 0xe99dda0 244964768
r15 0x46a185e8 1184990696
rip 0x2b84f0b4ad24 0x2b84f0b4ad24 <call+340>
eflags 0x10206 [ PF IF RF ]
cs 0x33 51
ss 0xe02b 57387
ds 0x0 0
es 0x0 0
fs 0x63 99
gs 0x0 0
fctrl 0x37f 895
fstat 0x0 0
ftag 0xffff 65535
fiseg 0x0 0
fioff 0x0 0
foseg 0x0 0
fooff 0x0 0
fop 0x0 0
mxcsr 0x1fa0 [ PE IM DM ZM OM UM PM ]
========> envP 是否存储在寄存器 rbp 中？
------------------------返回第0帧--------------------
(gdb) frame 0
#0 finishCurlMulti (envP=0x0, curlMultiP=0xe37b800, timeoutType=timeout_no, deadline=..., interruptP=0x0) at xmlrpc_curl_transport.c:572
572
(gdb) print envP
$2 = (xmlrpc_env * const) 0x0
(gdb) info register
rax 0x0 0
rbx 0x0 0
rcx 0x0 0
rdx 0x2 2
rsi 0x46a18200 1184989696
rdi 0xe37b800 238532608
rbp 0xe37b800 0xe37b800
rsp 0x46a182f0 0x46a182f0
r8 0x46a17f00 1184988928
r9 0x46a17ef0 1184988912
r10 0x46a18100 1184989440
r11 0x206 518
r12 0x0 0
r13 0x0 0
r14 0x0 0
r15 0x0 0
rip 0x2b84f0b49e93 0x2b84f0b49e93 <finishCurlMulti+259>
eflags 0x10206 [ PF IF RF ]
cs 0x33 51
ss 0xe02b 57387
ds 0x0 0
es 0x0 0
fs 0x63 99
gs 0x0 0
fctrl 0x37f 895
fstat 0x0 0
ftag 0xffff 65535
fiseg 0x0 0
fioff 0x0 0
foseg 0x0 0
fooff 0x0 0
fop 0x0 0
mxcsr 0x1fa0 [ PE IM DM ZM OM UM PM ]
========> 请告诉我在这种情况下出了什么问题？
我正在尝试使用 -O0 禁用优化器，但我不确定。
谢谢。
这是我使用正确的源文件的回溯：
#0 finishCurlMulti (envP=0x0, curlMultiP=0x12e2580, timeoutType=timeout_yes, deadline=..., interruptP=0x0) at xmlrpc_curl_transport.c:572
#1 0x00002abe7f51d0b4 in finishAsynch (clientTransportP=0x12e24c0, timeoutType=timeout_yes, timeout=10000) at xmlrpc_curl_transport.c:1301
#2 0x00002abe7f72f5c6 in xmlrpc_c::clientXmlTransport_http::finishAsync (this=0x12e2470, timeout=...) at client.cpp:624
#3 0x00002abe7f72f64a in xmlrpc_c::client_xml::finishAsync (this=0x1304bf0, timeout=...) at client.cpp:893
#4 0x00002aaaab57c26d in UrlStruct::runXmlRpc (this=0x122d140, method="mediacontrol.onEvent", paramList=<value optimized out>, result=<value optimized out>) at Utils.cpp:146
#5 0x00002aaaab57c526 in IVRUtils::executeXmlRpc (controllerUrl=0x12e2580, methodName=Traceback (most recent call last):
#6 0x00002aaaab54366a in IvrCoreSession::_exec_xmlrpc_cmd (this=0x2aaab48277f0, paramList=..., result=0x41228cb0) at IvrCoreSession.cpp:307
#7 0x00002aaaab544c95 in IvrCoreSession::fireEndCallEvent (this=0x2aaab48277f0) at IvrCoreSession.cpp:504
#8 0x00002aaaab54752d in IvrCoreSession::~IvrCoreSession (this=0x2aaab48277f0, __in_chrg=<value optimized out>) at IvrCoreSession.cpp:101
#9 0x000000000047c15d in AmSessionContainer::clean_sessions (this=0x10cbdd0) at AmSessionContainer.cpp:94
#10 0x000000000047c898 in AmSessionContainer::run (this=0x10cbdd0) at AmSessionContainer.cpp:132
#11 0x000000000049266c in AmThread::_start (_t=<value optimized out>) at AmThread.cpp:70
#12 0x000000397ec0673d in start_thread () from /lib64/libpthread.so.0
#13 0x000000397e0d40cd in clone () from /lib64/libc.so.6
此错误每 6 天发生一次。我们使用带有 curl 构建选项的 xmlrpc-c 库--enable-threaded-resolver。请给我们一些想法。
谢谢。