mirror of
https://github.com/MariaDB/server.git
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289 lines
7.8 KiB
Perl
289 lines
7.8 KiB
Perl
# -*- cperl -*-
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# Copyright (C) 2004-2006 MySQL AB
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#
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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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#
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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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#
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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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package My::CoreDump;
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use strict;
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use Carp;
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use My::Platform;
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use File::Temp qw/ tempfile tempdir /;
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my $hint_mysqld; # Last resort guess for executable path
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# If path in core file is 79 chars we assume it's been truncated
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# Looks like we can still find the full path using 'strings'
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# If that doesn't work, use the hint (mysqld path) as last resort.
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sub _verify_binpath {
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my ($binary, $core_name)= @_;
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my $binpath;
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if (length $binary != 79) {
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$binpath= $binary;
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print "Core generated by '$binpath'\n";
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} else {
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# Last occurrence of path ending in /mysql*, cut from first /
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if (`strings '$core_name' | grep "/mysql[^/. ]*\$" | tail -1` =~ /(\/.*)/) {
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$binpath= $1;
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print "Guessing that core was generated by '$binpath'\n";
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} else {
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return unless $hint_mysqld;
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$binpath= $hint_mysqld;
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print "Wild guess that core was generated by '$binpath'\n";
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}
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}
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return $binpath;
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}
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sub _gdb {
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my ($core_name)= @_;
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print "\nTrying 'gdb' to get a backtrace\n";
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return unless -f $core_name;
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# Find out name of binary that generated core
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`gdb -c '$core_name' --batch 2>&1` =~
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/Core was generated by `([^\s\'\`]+)/;
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my $binary= $1 or return;
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$binary= _verify_binpath ($binary, $core_name) or return;
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# Create tempfile containing gdb commands
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my ($tmp, $tmp_name) = tempfile();
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print $tmp
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"bt\n",
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"thread apply all bt\n",
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"quit\n";
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close $tmp or die "Error closing $tmp_name: $!";
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# Run gdb
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my $gdb_output=
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`gdb '$binary' -c '$core_name' -x '$tmp_name' --batch 2>&1`;
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unlink $tmp_name or die "Error removing $tmp_name: $!";
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return if $? >> 8;
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return unless $gdb_output;
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print <<EOF, $gdb_output, "\n";
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Output from gdb follows. The first stack trace is from the failing thread.
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The following stack traces are from all threads (so the failing one is
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duplicated).
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--------------------------
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EOF
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return 1;
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}
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sub _dbx {
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my ($core_name)= @_;
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print "\nTrying 'dbx' to get a backtrace\n";
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return unless -f $core_name;
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# Find out name of binary that generated core
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`echo | dbx - '$core_name' 2>&1` =~
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/Corefile specified executable: "([^"]+)"/;
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my $binary= $1 or return;
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$binary= _verify_binpath ($binary, $core_name) or return;
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# Find all threads
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my @thr_ids = `echo threads | dbx '$binary' '$core_name' 2>&1` =~ /t@\d+/g;
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# Create tempfile containing dbx commands
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my ($tmp, $tmp_name) = tempfile();
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foreach my $thread (@thr_ids) {
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print $tmp "where $thread\n";
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}
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print $tmp "exit\n";
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close $tmp or die "Error closing $tmp_name: $!";
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# Run dbx
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my $dbx_output=
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`cat '$tmp_name' | dbx '$binary' '$core_name' 2>&1`;
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unlink $tmp_name or die "Error removing $tmp_name: $!";
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return if $? >> 8;
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return unless $dbx_output;
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print <<EOF, $dbx_output, "\n";
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Output from dbx follows. Stack trace is printed for all threads in order,
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above this you should see info about which thread was the failing one.
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----------------------------
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EOF
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return 1;
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}
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# Check that Debugging tools for Windows are installed
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sub cdb_check {
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`cdb -? 2>&1`;
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if ($? >> 8)
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{
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print "Cannot find cdb. Please Install Debugging tools for Windows\n";
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print "from http://www.microsoft.com/whdc/devtools/debugging/";
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if($ENV{'ProgramW6432'})
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{
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print "install64bit.mspx (native x64 version)\n";
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}
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else
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{
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print "installx86.mspx\n";
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}
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}
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}
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sub _cdb {
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my ($core_name)= @_;
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print "\nTrying 'cdb' to get a backtrace\n";
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return unless -f $core_name;
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# Try to set environment for debugging tools for Windows
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if ($ENV{'PATH'} !~ /Debugging Tools/)
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{
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if ($ENV{'ProgramW6432'})
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{
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# On x64 computer
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$ENV{'PATH'}.= ";".$ENV{'ProgramW6432'}."\\Debugging Tools For Windows (x64)";
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}
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else
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{
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# On x86 computer. Newest versions of Debugging tools are installed in the
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# directory with (x86) suffix, older versions did not have this suffix.
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$ENV{'PATH'}.= ";".$ENV{'ProgramFiles'}."\\Debugging Tools For Windows (x86)";
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$ENV{'PATH'}.= ";".$ENV{'ProgramFiles'}."\\Debugging Tools For Windows";
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}
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}
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# Read module list, find out the name of executable and
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# build symbol path (required by cdb if executable was built on
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# different machine)
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my $tmp_name= $core_name.".cdb_lmv";
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`cdb -z $core_name -c \"lmv;q\" > $tmp_name 2>&1`;
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if ($? >> 8)
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{
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unlink($tmp_name);
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# check if cdb is installed and complain if not
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cdb_check();
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return;
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}
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open(temp,"< $tmp_name");
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my %dirhash=();
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while(<temp>)
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{
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if($_ =~ /Image path\: (.*)/)
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{
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if (rindex($1,'\\') != -1)
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{
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my $dir= substr($1, 0, rindex($1,'\\'));
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$dirhash{$dir}++;
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}
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}
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}
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close(temp);
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unlink($tmp_name);
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my $image_path= join(";", (keys %dirhash),".");
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# For better callstacks, setup _NT_SYMBOL_PATH to include
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# OS symbols. Note : Dowloading symbols for the first time
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# can take some minutes
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if (!$ENV{'_NT_SYMBOL_PATH'})
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{
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my $windir= $ENV{'windir'};
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my $symbol_cache= substr($windir ,0, index($windir,'\\'))."\\cdb_symbols";
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print "OS debug symbols will be downloaded and stored in $symbol_cache.\n";
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print "You can control the location of symbol cache with _NT_SYMBOL_PATH\n";
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print "environment variable. Please refer to Microsoft KB article\n";
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print "http://support.microsoft.com/kb/311503 for details about _NT_SYMBOL_PATH\n";
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print "-------------------------------------------------------------------------\n";
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$ENV{'_NT_SYMBOL_PATH'}.=
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"srv*".$symbol_cache."*http://msdl.microsoft.com/download/symbols";
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}
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my $symbol_path= $image_path.";".$ENV{'_NT_SYMBOL_PATH'};
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# Run cdb. Use "analyze" extension to print crashing thread stacktrace
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# and "uniqstack" to print other threads
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my $cdb_cmd = "!sym prompts off; !analyze -v; .ecxr; !for_each_frame dv /t;!uniqstack -p;q";
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my $cdb_output=
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`cdb -c "$cdb_cmd" -z $core_name -i "$image_path" -y "$symbol_path" -t 0 -lines 2>&1`;
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return if $? >> 8;
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return unless $cdb_output;
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# Remove comments (lines starting with *), stack pointer and frame
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# pointer adresses and offsets to function to make output better readable
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$cdb_output=~ s/^\*.*\n//gm;
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$cdb_output=~ s/^([\:0-9a-fA-F\`]+ )+//gm;
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$cdb_output=~ s/^ChildEBP RetAddr//gm;
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$cdb_output=~ s/^Child\-SP RetAddr Call Site//gm;
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$cdb_output=~ s/\+0x([0-9a-fA-F]+)//gm;
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print <<EOF, $cdb_output, "\n";
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Output from cdb follows. Faulting thread is printed twice,with and without function parameters
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Search for STACK_TEXT to see the stack trace of
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the faulting thread. Callstacks of other threads are printed after it.
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EOF
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return 1;
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}
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sub show {
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my ($class, $core_name, $exe_mysqld)= @_;
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$hint_mysqld= $exe_mysqld;
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# On Windows, rely on cdb to be there...
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if (IS_WINDOWS)
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{
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_cdb($core_name);
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return;
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}
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# We try dbx first; gdb itself may coredump if run on a Sun Studio
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# compiled binary on Solaris.
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my @debuggers =
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(
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\&_dbx,
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\&_gdb,
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# TODO...
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);
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# Try debuggers until one succeeds
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foreach my $debugger (@debuggers){
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if ($debugger->($core_name)){
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return;
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}
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}
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return;
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}
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1;
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