mirror of https://github.com/postgres/postgres
Add backtrace support for error reporting
Add some support for automatically showing backtraces in certain error situations in the server. Backtraces are shown on assertion failure; also, a new setting backtrace_functions can be set to a list of C function names, and all ereport()s and elog()s from the mentioned functions will have backtraces generated. Finally, the function errbacktrace() can be manually added to an ereport() call to generate a backtrace for that call. Authors: Peter Eisentraut, Álvaro Herrera Discussion: https://postgr.es/m//5f48cb47-bf1e-05b6-7aae-3bf2cd01586d@2ndquadrant.com Discussion: https://postgr.es/m/CAMsr+YGL+yfWE=JvbUbnpWtrRZNey7hJ07+zT4bYJdVp4Szdrg@mail.gmail.com
This commit is contained in:
Alvaro Herrera
parent
3dcffb381c
commit
71a8a4f6e3
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@ -11607,6 +11607,63 @@ if test "$ac_res" != no; then :
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fi
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# *BSD:
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing backtrace_symbols" >&5
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$as_echo_n "checking for library containing backtrace_symbols... " >&6; }
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if ${ac_cv_search_backtrace_symbols+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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ac_func_search_save_LIBS=$LIBS
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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/* Override any GCC internal prototype to avoid an error.
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Use char because int might match the return type of a GCC
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builtin and then its argument prototype would still apply. */
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#ifdef __cplusplus
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extern "C"
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#endif
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char backtrace_symbols ();
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int
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main ()
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{
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return backtrace_symbols ();
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;
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return 0;
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}
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_ACEOF
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for ac_lib in '' execinfo; do
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if test -z "$ac_lib"; then
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ac_res="none required"
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else
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ac_res=-l$ac_lib
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LIBS="-l$ac_lib $ac_func_search_save_LIBS"
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fi
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if ac_fn_c_try_link "$LINENO"; then :
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ac_cv_search_backtrace_symbols=$ac_res
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fi
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rm -f core conftest.err conftest.$ac_objext \
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conftest$ac_exeext
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if ${ac_cv_search_backtrace_symbols+:} false; then :
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break
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fi
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done
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if ${ac_cv_search_backtrace_symbols+:} false; then :
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else
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ac_cv_search_backtrace_symbols=no
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fi
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rm conftest.$ac_ext
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LIBS=$ac_func_search_save_LIBS
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_backtrace_symbols" >&5
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$as_echo "$ac_cv_search_backtrace_symbols" >&6; }
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ac_res=$ac_cv_search_backtrace_symbols
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if test "$ac_res" != no; then :
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test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
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fi
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if test "$with_readline" = yes; then
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@ -12705,7 +12762,7 @@ $as_echo "#define HAVE_STDBOOL_H 1" >>confdefs.h
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fi
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for ac_header in atomic.h copyfile.h fp_class.h getopt.h ieeefp.h ifaddrs.h langinfo.h mbarrier.h poll.h sys/epoll.h sys/ipc.h sys/prctl.h sys/procctl.h sys/pstat.h sys/resource.h sys/select.h sys/sem.h sys/shm.h sys/sockio.h sys/tas.h sys/un.h termios.h ucred.h utime.h wchar.h wctype.h
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for ac_header in atomic.h copyfile.h execinfo.h fp_class.h getopt.h ieeefp.h ifaddrs.h langinfo.h mbarrier.h poll.h sys/epoll.h sys/ipc.h sys/prctl.h sys/procctl.h sys/pstat.h sys/resource.h sys/select.h sys/sem.h sys/shm.h sys/sockio.h sys/tas.h sys/un.h termios.h ucred.h utime.h wchar.h wctype.h
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do :
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as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
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ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
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@ -14935,7 +14992,7 @@ fi
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LIBS_including_readline="$LIBS"
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LIBS=`echo "$LIBS" | sed -e 's/-ledit//g' -e 's/-lreadline//g'`
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for ac_func in cbrt clock_gettime copyfile fdatasync getifaddrs getpeerucred getrlimit mbstowcs_l memset_s memmove poll posix_fallocate ppoll pstat pthread_is_threaded_np readlink setproctitle setproctitle_fast setsid shm_open strchrnul strsignal symlink sync_file_range uselocale utime utimes wcstombs_l
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for ac_func in backtrace_symbols cbrt clock_gettime copyfile fdatasync getifaddrs getpeerucred getrlimit mbstowcs_l memset_s memmove poll posix_fallocate ppoll pstat pthread_is_threaded_np readlink setproctitle setproctitle_fast setsid shm_open strchrnul strsignal symlink sync_file_range uselocale utime utimes wcstombs_l
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do :
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as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
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ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
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@ -1133,6 +1133,8 @@ AC_SEARCH_LIBS(sched_yield, rt)
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AC_SEARCH_LIBS(gethostbyname_r, nsl)
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# Cygwin:
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AC_SEARCH_LIBS(shmget, cygipc)
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# *BSD:
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AC_SEARCH_LIBS(backtrace_symbols, execinfo)
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if test "$with_readline" = yes; then
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PGAC_CHECK_READLINE
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@ -1275,6 +1277,7 @@ AC_HEADER_STDBOOL
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AC_CHECK_HEADERS(m4_normalize([
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atomic.h
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copyfile.h
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execinfo.h
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fp_class.h
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getopt.h
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ieeefp.h
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@ -1608,6 +1611,7 @@ LIBS_including_readline="$LIBS"
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LIBS=`echo "$LIBS" | sed -e 's/-ledit//g' -e 's/-lreadline//g'`
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AC_CHECK_FUNCS(m4_normalize([
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backtrace_symbols
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cbrt
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clock_gettime
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copyfile
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@ -9489,6 +9489,32 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
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</listitem>
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</varlistentry>
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<varlistentry id="guc-backtrace-functions" xreflabel="backtrace_functions">
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<term><varname>backtrace_functions</varname> (<type>string</type>)
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<indexterm>
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<primary><varname>backtrace_functions</varname> configuration parameter</primary>
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</indexterm>
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</term>
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<listitem>
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<para>
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This parameter contains a comma-separated list of C function names.
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If an error is raised and the name of the internal C function where
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the error happens matches a value in the list, then a backtrace is
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written to the server log together with the error message. This can
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be used to debug specific areas of the source code.
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</para>
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<para>
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Backtrace support is not available on all platforms, and the quality
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of the backtraces depends on compilation options.
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</para>
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<para>
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This parameter can only be set by superusers.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="guc-ignore-system-indexes" xreflabel="ignore_system_indexes">
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<term><varname>ignore_system_indexes</varname> (<type>boolean</type>)
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<indexterm>
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@ -18,6 +18,9 @@
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#include "postgres.h"
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#include <unistd.h>
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#ifdef HAVE_EXECINFO_H
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#include <execinfo.h>
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#endif
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/*
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* ExceptionalCondition - Handles the failure of an Assert()
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@ -42,6 +45,16 @@ ExceptionalCondition(const char *conditionName,
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/* Usually this shouldn't be needed, but make sure the msg went out */
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fflush(stderr);
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#ifdef HAVE_BACKTRACE_SYMBOLS
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{
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void *buf[100];
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int nframes;
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nframes = backtrace(buf, lengthof(buf));
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backtrace_symbols_fd(buf, nframes, fileno(stderr));
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}
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#endif
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#ifdef SLEEP_ON_ASSERT
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/*
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@ -62,6 +62,9 @@
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#ifdef HAVE_SYSLOG
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#include <syslog.h>
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#endif
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#ifdef HAVE_EXECINFO_H
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#include <execinfo.h>
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#endif
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#include "access/transam.h"
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#include "access/xact.h"
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@ -167,6 +170,7 @@ static char formatted_log_time[FORMATTED_TS_LEN];
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static const char *err_gettext(const char *str) pg_attribute_format_arg(1);
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static pg_noinline void set_backtrace(ErrorData *edata, int num_skip);
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static void set_errdata_field(MemoryContextData *cxt, char **ptr, const char *str);
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static void write_console(const char *line, int len);
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static void setup_formatted_log_time(void);
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@ -398,6 +402,32 @@ errstart(int elevel, const char *filename, int lineno,
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return true;
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}
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/*
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* Checks whether the given funcname matches backtrace_functions; see
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* check_backtrace_functions.
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*/
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static bool
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matches_backtrace_functions(const char *funcname)
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{
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char *p;
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if (!backtrace_symbol_list || funcname == NULL || funcname[0] == '\0')
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return false;
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p = backtrace_symbol_list;
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for (;;)
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{
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if (*p == '\0') /* end of backtrace_symbol_list */
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break;
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if (strcmp(funcname, p) == 0)
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return true;
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p += strlen(p) + 1;
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}
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return false;
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}
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/*
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* errfinish --- end an error-reporting cycle
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*
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*/
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oldcontext = MemoryContextSwitchTo(ErrorContext);
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if (!edata->backtrace &&
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edata->funcname &&
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backtrace_functions &&
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matches_backtrace_functions(edata->funcname))
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set_backtrace(edata, 2);
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/*
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* Call any context callback functions. Errors occurring in callback
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* functions will be treated as recursive errors --- this ensures we will
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@ -488,6 +524,8 @@ errfinish(int dummy,...)
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pfree(edata->hint);
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if (edata->context)
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pfree(edata->context);
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if (edata->backtrace)
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pfree(edata->backtrace);
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if (edata->schema_name)
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pfree(edata->schema_name);
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if (edata->table_name)
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@ -798,6 +836,65 @@ errmsg(const char *fmt,...)
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return 0; /* return value does not matter */
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}
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/*
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* Add a backtrace to the containing ereport() call. This is intended to be
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* added temporarily during debugging.
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*/
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int
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errbacktrace(void)
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{
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ErrorData *edata = &errordata[errordata_stack_depth];
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MemoryContext oldcontext;
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Assert(false);
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recursion_depth++;
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CHECK_STACK_DEPTH();
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oldcontext = MemoryContextSwitchTo(edata->assoc_context);
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set_backtrace(edata, 1);
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MemoryContextSwitchTo(oldcontext);
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recursion_depth--;
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return 0;
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}
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/*
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* Compute backtrace data and add it to the supplied ErrorData. num_skip
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* specifies how many inner frames to skip. Use this to avoid showing the
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* internal backtrace support functions in the backtrace. This requires that
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* this and related functions are not inlined.
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*/
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static void
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set_backtrace(ErrorData *edata, int num_skip)
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{
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StringInfoData errtrace;
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initStringInfo(&errtrace);
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#ifdef HAVE_BACKTRACE_SYMBOLS
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{
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void *buf[100];
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int nframes;
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char **strfrms;
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nframes = backtrace(buf, lengthof(buf));
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strfrms = backtrace_symbols(buf, nframes);
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if (strfrms == NULL)
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return;
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for (int i = num_skip; i < nframes; i++)
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appendStringInfo(&errtrace, "\n%s", strfrms[i]);
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free(strfrms);
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}
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#else
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appendStringInfoString(&errtrace,
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"backtrace generation is not supported by this installation");
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#endif
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edata->backtrace = errtrace.data;
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}
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/*
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* errmsg_internal --- add a primary error message text to the current error
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@ -1353,6 +1450,11 @@ elog_finish(int elevel, const char *fmt,...)
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recursion_depth++;
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oldcontext = MemoryContextSwitchTo(edata->assoc_context);
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if (!edata->backtrace &&
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edata->funcname &&
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matches_backtrace_functions(edata->funcname))
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set_backtrace(edata, 2);
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edata->message_id = fmt;
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EVALUATE_MESSAGE(edata->domain, message, false, false);
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@ -1509,6 +1611,8 @@ CopyErrorData(void)
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newedata->hint = pstrdup(newedata->hint);
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if (newedata->context)
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newedata->context = pstrdup(newedata->context);
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if (newedata->backtrace)
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newedata->backtrace = pstrdup(newedata->backtrace);
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if (newedata->schema_name)
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newedata->schema_name = pstrdup(newedata->schema_name);
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if (newedata->table_name)
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@ -1547,6 +1651,8 @@ FreeErrorData(ErrorData *edata)
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pfree(edata->hint);
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if (edata->context)
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pfree(edata->context);
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if (edata->backtrace)
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pfree(edata->backtrace);
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if (edata->schema_name)
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pfree(edata->schema_name);
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if (edata->table_name)
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@ -1622,6 +1728,8 @@ ThrowErrorData(ErrorData *edata)
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newedata->hint = pstrdup(edata->hint);
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if (edata->context)
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newedata->context = pstrdup(edata->context);
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if (edata->backtrace)
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newedata->backtrace = pstrdup(edata->backtrace);
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/* assume message_id is not available */
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if (edata->schema_name)
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newedata->schema_name = pstrdup(edata->schema_name);
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@ -1689,6 +1797,8 @@ ReThrowError(ErrorData *edata)
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newedata->hint = pstrdup(newedata->hint);
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if (newedata->context)
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newedata->context = pstrdup(newedata->context);
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if (newedata->backtrace)
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newedata->backtrace = pstrdup(newedata->backtrace);
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if (newedata->schema_name)
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newedata->schema_name = pstrdup(newedata->schema_name);
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if (newedata->table_name)
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@ -2914,6 +3024,13 @@ send_message_to_server_log(ErrorData *edata)
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append_with_tabs(&buf, edata->context);
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appendStringInfoChar(&buf, '\n');
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}
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if (edata->backtrace)
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{
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log_line_prefix(&buf, edata);
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appendStringInfoString(&buf, _("BACKTRACE: "));
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append_with_tabs(&buf, edata->backtrace);
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appendStringInfoChar(&buf, '\n');
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}
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if (Log_error_verbosity >= PGERROR_VERBOSE)
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{
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/* assume no newlines in funcname or filename... */
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@ -201,6 +201,8 @@ static bool check_cluster_name(char **newval, void **extra, GucSource source);
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static const char *show_unix_socket_permissions(void);
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static const char *show_log_file_mode(void);
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static const char *show_data_directory_mode(void);
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static bool check_backtrace_functions(char **newval, void **extra, GucSource source);
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static void assign_backtrace_functions(const char *newval, void *extra);
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static bool check_recovery_target_timeline(char **newval, void **extra, GucSource source);
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static void assign_recovery_target_timeline(const char *newval, void *extra);
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static bool check_recovery_target(char **newval, void **extra, GucSource source);
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@ -515,6 +517,8 @@ int log_temp_files = -1;
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double log_statement_sample_rate = 1.0;
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double log_xact_sample_rate = 0;
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int trace_recovery_messages = LOG;
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char *backtrace_functions;
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char *backtrace_symbol_list;
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int temp_file_limit = -1;
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@ -4224,6 +4228,17 @@ static struct config_string ConfigureNamesString[] =
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NULL, NULL, NULL
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},
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{
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{"backtrace_functions", PGC_SUSET, DEVELOPER_OPTIONS,
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gettext_noop("Log backtrace for errors in these functions."),
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NULL,
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GUC_NOT_IN_SAMPLE
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},
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&backtrace_functions,
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"",
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check_backtrace_functions, assign_backtrace_functions, NULL
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},
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/* End-of-list marker */
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{
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{NULL, 0, 0, NULL, NULL}, NULL, NULL, NULL, NULL, NULL
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@ -11487,6 +11502,76 @@ show_data_directory_mode(void)
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return buf;
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}
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/*
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* We split the input string, where commas separate function names
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* and certain whitespace chars are ignored, into a \0-separated (and
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* \0\0-terminated) list of function names. This formulation allows
|
||||
* easy scanning when an error is thrown while avoiding the use of
|
||||
* non-reentrant strtok(), as well as keeping the output data in a
|
||||
* single palloc() chunk.
|
||||
*/
|
||||
static bool
|
||||
check_backtrace_functions(char **newval, void **extra, GucSource source)
|
||||
{
|
||||
int newvallen = strlen(*newval);
|
||||
char *someval;
|
||||
int validlen;
|
||||
int i;
|
||||
int j;
|
||||
|
||||
/*
|
||||
* Allow characters that can be C identifiers and commas as separators, as
|
||||
* well as some whitespace for readability.
|
||||
*/
|
||||
validlen = strspn(*newval,
|
||||
"0123456789_"
|
||||
"abcdefghijklmnopqrstuvwxyz"
|
||||
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
||||
", \n\t");
|
||||
if (validlen != newvallen)
|
||||
{
|
||||
GUC_check_errdetail("invalid character");
|
||||
return false;
|
||||
}
|
||||
|
||||
if (*newval[0] == '\0')
|
||||
{
|
||||
*extra = NULL;
|
||||
return true;
|
||||
}
|
||||
|
||||
/*
|
||||
* Allocate space for the output and create the copy. We could discount
|
||||
* whitespace chars to save some memory, but it doesn't seem worth the
|
||||
* trouble.
|
||||
*/
|
||||
someval = guc_malloc(ERROR, newvallen + 1 + 1);
|
||||
for (i = 0, j = 0; i < newvallen; i++)
|
||||
{
|
||||
if ((*newval)[i] == ',')
|
||||
someval[j++] = '\0'; /* next item */
|
||||
else if ((*newval)[i] == ' ' ||
|
||||
(*newval)[i] == '\n' ||
|
||||
(*newval)[i] == '\t')
|
||||
; /* ignore these */
|
||||
else
|
||||
someval[j++] = (*newval)[i]; /* copy anything else */
|
||||
}
|
||||
|
||||
/* two \0s end the setting */
|
||||
someval[j] = '\0';
|
||||
someval[j + 1] = '\0';
|
||||
|
||||
*extra = someval;
|
||||
return true;
|
||||
}
|
||||
|
||||
static void
|
||||
assign_backtrace_functions(const char *newval, void *extra)
|
||||
{
|
||||
backtrace_symbol_list = (char *) extra;
|
||||
}
|
||||
|
||||
static bool
|
||||
check_recovery_target_timeline(char **newval, void **extra, GucSource source)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -96,6 +96,9 @@
|
|||
/* Define to 1 if you have the <atomic.h> header file. */
|
||||
#undef HAVE_ATOMIC_H
|
||||
|
||||
/* Define to 1 if you have the `backtrace_symbols' function. */
|
||||
#undef HAVE_BACKTRACE_SYMBOLS
|
||||
|
||||
/* Define to 1 if you have the `BIO_get_data' function. */
|
||||
#undef HAVE_BIO_GET_DATA
|
||||
|
||||
|
|
@ -198,6 +201,9 @@
|
|||
/* Define to 1 if you have the `explicit_bzero' function. */
|
||||
#undef HAVE_EXPLICIT_BZERO
|
||||
|
||||
/* Define to 1 if you have the <execinfo.h> header file. */
|
||||
#undef HAVE_EXECINFO_H
|
||||
|
||||
/* Define to 1 if you have the `fdatasync' function. */
|
||||
#undef HAVE_FDATASYNC
|
||||
|
||||
|
|
|
|||
|
|
@ -189,6 +189,8 @@ extern int errcontext_msg(const char *fmt,...) pg_attribute_printf(1, 2);
|
|||
extern int errhidestmt(bool hide_stmt);
|
||||
extern int errhidecontext(bool hide_ctx);
|
||||
|
||||
extern int errbacktrace(void);
|
||||
|
||||
extern int errfunction(const char *funcname);
|
||||
extern int errposition(int cursorpos);
|
||||
|
||||
|
|
@ -392,6 +394,7 @@ typedef struct ErrorData
|
|||
char *detail_log; /* detail error message for server log only */
|
||||
char *hint; /* hint message */
|
||||
char *context; /* context message */
|
||||
char *backtrace; /* backtrace */
|
||||
const char *message_id; /* primary message's id (original string) */
|
||||
char *schema_name; /* name of schema */
|
||||
char *table_name; /* name of table */
|
||||
|
|
|
|||
|
|
@ -256,6 +256,8 @@ extern int log_min_duration_statement;
|
|||
extern int log_temp_files;
|
||||
extern double log_statement_sample_rate;
|
||||
extern double log_xact_sample_rate;
|
||||
extern char *backtrace_functions;
|
||||
extern char *backtrace_symbol_list;
|
||||
|
||||
extern int temp_file_limit;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue