GDB分析PHP连接Memcached 导致coredump问题

#ps -ef|grep php-fpm|head#gdb --pid=$PID>source 

/usr/local/src//usr/local/src/php-5.3.10/.gdbinit

memcached_return_t memcached_io_slurp(memcached_server_write_instance_st ptr

){  assert_msg(ptr, "Programmer error, invalid memcached_server_write_instance_st");  

assert(memcached_is_udp(ptr->root) == false);  

if (ptr->fd == INVALID_SOCKET)  

{    

assert_msg(int(ptr->state) <= int(MEMCACHED_SERVER_STATE_ADDRINFO), "Invalid socket state");   

#line 510    return MEMCACHED_CONNECTION_FAILURE;  }  ssize_t data_read;

(gdb) f 3#3  0x00007ffed3431da6 in memcached_quit_server (ptr=0x2ef9f50, io_death=false) at libmemcached/quit.cc:95warning: Source file is more recent than executable.95              

while (memcached_continue(rc_slurp= memcached_io_slurp(ptr))) {} ;

WATCHPOINT_ASSERT(rc == MEMCACHED_SUCCESS or rc == MEMCACHED_FETCH_NOTFINISHED);     

/* read until socket is closed, or there is an error      

* closing the socket before all data is read      

* results in server throwing away all data which is      

* not read      

*      

* In .40 we began to only do this if we had been doing buffered      

* requests of had replication enabled.      

*/     

if (ptr->root->flags.buffer_requests or ptr->root->number_of_replicas)     

{      

 memcached_return_t rc_slurp;      

 while (memcached_continue(rc_slurp= memcached_io_slurp(ptr))) {} ;   

#line  95       

WATCHPOINT_ASSERT(rc_slurp == MEMCACHED_CONNECTION_FAILURE);     

}    

 /*      

* memcached_io_read may call memcached_quit_server with io_death if      

* it encounters problems, but we don't care about those occurences.      

* The intention of that loop is to drain the data sent from the      

* server to ensure that the server processed all of the data we      

* sent to the server.      

*/     

ptr->server_failure_counter= 0;   

}   

memcached_io_close(ptr); }

(gdb) f 7#7  0x00000000005d00e0 in php_memc_destroy (m_obj=0x2e3bf60, persistent=0 '\000') at 

/usr/local/src/php-5.3.10/ext/memcached/php_memcached.c:25192519    in /usr/local/src/php-5.3.10/ext/memcached/php_memcached.c一路往后f(gdb) f 24#24 0x0000000000884442 in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/local/src/php-5.3.10/sapi/fpm/fpm/fpm_main.c:18861886                            

php_request_shutdown((void *) 0);

fastcgi_request_done:                        

if (primary_script) {                                

efree(primary_script);                        

}                        

if (request_body_fd != -1) {                                

close(request_body_fd);                        

}                        

request_body_fd = -2;                        

if (EG(exit_status) == 255) {                                

if (CGIG(error_header) && *CGIG(error_header)) {                                        

sapi_header_line ctr = {0};                                        

ctr.line = CGIG(error_header);                                        

ctr.line_len = strlen(CGIG(error_header));                                        

sapi_header_op(SAPI_HEADER_REPLACE, &ctr TSRMLS_CC);                                

}                        

}                        

fpm_request_end(TSRMLS_C);                        

fpm_log_write(NULL TSRMLS_CC);                        

STR_FREE(SG(request_info).path_translated);                        

SG(request_info).path_translated = NULL;                        

php_request_shutdown((void *) 0);   #line  1886                        

if (exit_status == 0) {                                

exit_status = EG(exit_status);                        

}                        

requests++;                       

 if (max_requests && (requests == max_requests)) {                                

fcgi_finish_request(&request, 1);                                

if (max_requests != 1) {                                        

/* no need to return exit_status of the last request */                                       

 exit_status = 0;