231 lines
7.9 KiB
C++
231 lines
7.9 KiB
C++
/* Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "my_global.h"
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#include <signal.h>
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#include "sys_vars.h"
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#include "my_stacktrace.h"
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#include "connection_handler_manager.h" // Connection_handler_manager
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#include "mysqld_thd_manager.h" // Global_THD_manager
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#include "sql_class.h"
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#ifdef _WIN32
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#include <crtdbg.h>
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#define SIGNAL_FMT "exception 0x%x"
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#else
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#define SIGNAL_FMT "signal %d"
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#endif
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/*
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We are handling signals in this file.
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Any global variables we read should be 'volatile sig_atomic_t'
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to guarantee that we read some consistent value.
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*/
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static volatile sig_atomic_t segfaulted= 0;
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extern volatile sig_atomic_t calling_initgroups;
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/**
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* Handler for fatal signals
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*
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* Fatal events (seg.fault, bus error etc.) will trigger
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* this signal handler. The handler will try to dump relevant
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* debugging information to stderr and dump a core image.
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*
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* Signal handlers can only use a set of 'safe' system calls
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* and library functions. A list of safe calls in POSIX systems
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* are available at:
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* http://pubs.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_04.html
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* For MS Windows, guidelines are available at:
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* http://msdn.microsoft.com/en-us/library/xdkz3x12(v=vs.71).aspx
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*
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* @param sig Signal number
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*/
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extern "C" void handle_fatal_signal(int sig)
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{
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if (segfaulted)
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{
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my_safe_printf_stderr("Fatal " SIGNAL_FMT " while backtracing\n", sig);
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_exit(MYSQLD_FAILURE_EXIT); /* Quit without running destructors */
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}
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segfaulted = 1;
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#ifdef _WIN32
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SYSTEMTIME utc_time;
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GetSystemTime(&utc_time);
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const long hrs= utc_time.wHour;
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const long mins= utc_time.wMinute;
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const long secs= utc_time.wSecond;
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#else
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/* Using time() instead of my_time() to avoid looping */
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const time_t curr_time= time(NULL);
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/* Calculate time of day */
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const long tmins = curr_time / 60;
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const long thrs = tmins / 60;
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const long hrs = thrs % 24;
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const long mins = tmins % 60;
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const long secs = curr_time % 60;
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#endif
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char hrs_buf[3]= "00";
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char mins_buf[3]= "00";
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char secs_buf[3]= "00";
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my_safe_itoa(10, hrs, &hrs_buf[2]);
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my_safe_itoa(10, mins, &mins_buf[2]);
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my_safe_itoa(10, secs, &secs_buf[2]);
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my_safe_printf_stderr("%s:%s:%s UTC - mysqld got " SIGNAL_FMT " ;\n",
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hrs_buf, mins_buf, secs_buf, sig);
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my_safe_printf_stderr("%s",
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"This could be because you hit a bug. It is also possible that this binary\n"
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"or one of the libraries it was linked against is corrupt, improperly built,\n"
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"or misconfigured. This error can also be caused by malfunctioning hardware.\n");
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my_safe_printf_stderr("%s",
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"Attempting to collect some information that could help diagnose the problem.\n"
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"As this is a crash and something is definitely wrong, the information\n"
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"collection process might fail.\n\n");
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my_safe_printf_stderr("key_buffer_size=%lu\n",
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(ulong) dflt_key_cache->key_cache_mem_size);
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my_safe_printf_stderr("read_buffer_size=%ld\n",
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(long) global_system_variables.read_buff_size);
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my_safe_printf_stderr("max_used_connections=%lu\n",
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Connection_handler_manager::max_used_connections);
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uint max_threads= 1;
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#ifndef EMBEDDED_LIBRARY
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max_threads= Connection_handler_manager::max_threads;
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#endif
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my_safe_printf_stderr("max_threads=%u\n", max_threads);
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my_safe_printf_stderr("thread_count=%u\n", Global_THD_manager::global_thd_count);
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my_safe_printf_stderr("connection_count=%u\n",
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Connection_handler_manager::connection_count);
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my_safe_printf_stderr("It is possible that mysqld could use up to \n"
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"key_buffer_size + "
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"(read_buffer_size + sort_buffer_size)*max_threads = "
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"%lu K bytes of memory\n",
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((ulong) dflt_key_cache->key_cache_mem_size +
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(global_system_variables.read_buff_size +
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global_system_variables.sortbuff_size) *
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max_threads +
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max_connections * sizeof(THD)) / 1024);
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my_safe_printf_stderr("%s",
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"Hope that's ok; if not, decrease some variables in the equation.\n\n");
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#ifdef HAVE_STACKTRACE
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THD *thd= my_thread_get_THR_THD();
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if (!(test_flags & TEST_NO_STACKTRACE))
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{
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my_safe_printf_stderr("Thread pointer: 0x%p\n", thd);
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my_safe_printf_stderr("%s",
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"Attempting backtrace. You can use the following "
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"information to find out\n"
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"where mysqld died. If you see no messages after this, something went\n"
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"terribly wrong...\n");
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my_print_stacktrace(thd ? (uchar*) thd->thread_stack : NULL,
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my_thread_stack_size);
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}
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if (thd)
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{
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const char *kreason= "UNKNOWN";
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switch (thd->killed) {
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case THD::NOT_KILLED:
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kreason= "NOT_KILLED";
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break;
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case THD::KILL_BAD_DATA:
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kreason= "KILL_BAD_DATA";
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break;
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case THD::KILL_CONNECTION:
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kreason= "KILL_CONNECTION";
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break;
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case THD::KILL_QUERY:
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kreason= "KILL_QUERY";
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break;
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case THD::KILL_TIMEOUT:
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kreason= "KILL_TIMEOUT";
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break;
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case THD::KILLED_NO_VALUE:
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kreason= "KILLED_NO_VALUE";
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break;
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}
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my_safe_printf_stderr("%s", "\n"
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"Trying to get some variables.\n"
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"Some pointers may be invalid and cause the dump to abort.\n");
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my_safe_printf_stderr("Query (%p): ", thd->query().str);
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my_safe_puts_stderr(thd->query().str, MY_MIN(1024U, thd->query().length));
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my_safe_printf_stderr("Connection ID (thread ID): %u\n",
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thd->thread_id());
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my_safe_printf_stderr("Status: %s\n\n", kreason);
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}
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my_safe_printf_stderr("%s",
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"The manual page at "
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"http://dev.mysql.com/doc/mysql/en/crashing.html contains\n"
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"information that should help you find out what is causing the crash.\n");
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#endif /* HAVE_STACKTRACE */
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#ifdef HAVE_INITGROUPS
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if (calling_initgroups)
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{
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my_safe_printf_stderr("%s", "\n"
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"This crash occured while the server was calling initgroups(). This is\n"
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"often due to the use of a mysqld that is statically linked against \n"
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"glibc and configured to use LDAP in /etc/nsswitch.conf.\n"
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"You will need to either upgrade to a version of glibc that does not\n"
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"have this problem (2.3.4 or later when used with nscd),\n"
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"disable LDAP in your nsswitch.conf, or use a "
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"mysqld that is not statically linked.\n");
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}
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#endif
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if (locked_in_memory)
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{
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my_safe_printf_stderr("%s", "\n"
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"The \"--memlock\" argument, which was enabled, "
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"uses system calls that are\n"
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"unreliable and unstable on some operating systems and "
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"operating-system versions (notably, some versions of Linux).\n"
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"This crash could be due to use of those buggy OS calls.\n"
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"You should consider whether you really need the "
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"\"--memlock\" parameter and/or consult the OS distributer about "
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"\"mlockall\" bugs.\n");
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}
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if (test_flags & TEST_CORE_ON_SIGNAL)
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{
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my_safe_printf_stderr("%s", "Writing a core file\n");
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my_write_core(sig);
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}
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#ifndef _WIN32
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/*
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Quit, without running destructors (etc.)
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On Windows, do not terminate, but pass control to exception filter.
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*/
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_exit(MYSQLD_FAILURE_EXIT); // Using _exit(), since exit() is not async signal safe
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#endif
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}
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