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var common = require('../common');
var assert = require('assert');
var os = require('os');
var util = require('util');
if (os.type() != 'SunOS') {
console.error('Skipping because postmortem debugging not available.');
process.exit(0);
}
/*
* Some functions to create a recognizable stack.
*/
var frames = [ 'stalloogle', 'bagnoogle', 'doogle' ];
var expected;
var stalloogle = function (str) {
expected = str;
os.loadavg();
};
var bagnoogle = function (arg0, arg1) {
stalloogle(arg0 + ' is ' + arg1 + ' except that it is read-only');
};
var done = false;
var doogle = function () {
if (!done)
setTimeout(doogle, 10);
bagnoogle('The bfs command', '(almost) like ed(1)');
};
var spawn = require('child_process').spawn;
var prefix = '/var/tmp/node';
var corefile = prefix + '.' + process.pid;
var args = [ corefile ];
if (process.env.MDB_LIBRARY_PATH && process.env.MDB_LIBRARY_PATH != '')
args = args.concat([ '-L', process.env.MDB_LIBRARY_PATH ]);
/*
* We're going to use DTrace to stop us, gcore us, and set us running again
* when we call getloadavg() -- with the implicit assumption that our
* deepest function is the only caller of os.loadavg().
*/
var dtrace = spawn('dtrace', [ '-qwn', 'syscall::getloadavg:entry/pid == ' +
process.pid + '/{stop(); system("gcore -o ' +
prefix + ' %d", pid); system("prun %d", pid); exit(0); }' ]);
var output = '';
var unlinkSync = require('fs').unlinkSync;
dtrace.stderr.on('data', function (data) {
console.log('dtrace: ' + data);
});
dtrace.on('exit', function (code) {
if (code != 0) {
console.error('dtrace exited with code ' + code);
process.exit(code);
}
done = true;
/*
* We have our core file. Now we need to fire up mdb to analyze it...
*/
var mdb = spawn('mdb', args, { stdio: 'pipe' });
var mod = util.format('::load %s\n',
path.join(__dirname,
'..',
'..',
'out',
'Release',
'mdb_v8.so'));
mdb.on('exit', function (code) {
var retained = '; core retained as ' + corefile;
if (code != 0) {
console.error('mdb exited with code ' + code + retained);
process.exit(code);
}
var sentinel = '<anonymous> (as ';
var arg1 = ' arg1: ';
var lines = output.split('\n');
var matched = 0;
var straddr = undefined;
for (var i = 0; i < lines.length; i++) {
var line = lines[i];
if (matched == 1 && line.indexOf(arg1) === 0) {
straddr = line.substr(arg1.length).split(' ')[0];
}
if (line.indexOf(sentinel) == -1 || frames.length === 0)
continue;
var frame = line.substr(line.indexOf(sentinel) + sentinel.length);
var top = frames.shift();
assert.equal(frame.indexOf(top), 0, 'unexpected frame where ' +
top + ' was expected' + retained);
matched++;
}
assert.equal(frames.length, 0, 'did not find expected frame ' +
frames[0] + retained);
assert.notEqual(straddr, undefined,
'did not find arg1 for top frame' + retained);
/*
* Now we're going to take one more swing at the core file to print out
* the argument string that we found.
*/
output = '';
mdb = spawn('mdb', args, { stdio: 'pipe' });
mdb.on('exit', function (code) {
if (code != 0) {
console.error('mdb (second) exited with code ' + code + retained);
process.exit(code);
}
assert.notEqual(output.indexOf(expected), -1, 'did not find arg1 (' +
straddr + ') to contain expected string' + retained);
unlinkSync(corefile);
process.exit(0);
});
mdb.stdout.on('data', function (data) {
output += data;
});
mdb.stderr.on('data', function (data) {
console.log('mdb (second) stderr: ' + data);
});
mdb.stdin.write(mod);
mdb.stdin.write(straddr + '::v8str\n');
mdb.stdin.end();
});
mdb.stdout.on('data', function (data) {
output += data;
});
mdb.stderr.on('data', function (data) {
console.log('mdb stderr: ' + data);
});
mdb.stdin.write(mod);
mdb.stdin.write('::jsstack -v\n');
mdb.stdin.end();
});
setTimeout(doogle, 10);
|
