jclulow

CFILES = run.c nvjson.c
HDRS = nvjson.h

run: $(CFILES) $(HDRS)
	gcc -o $@ $(CFILES) -lnvpair

jclulow

Table of Content
1 General decription
  1.1 Background Diagram
  1.2 Traditional 512 byte sector size disk
  1.3 Proposal on large sector size disk
  1.4 Proposal on emulation mode
2 Technical description
  2.1 The designs are based on the following assumptions
  2.2 Change summary
3 Proposed solution in detail

jclulow

So, int $3 debugging is alive and well in DTrace. Add USDT probes to your application:

var d = require('dtrace-provider');
var dtp = d.createDTraceProvider('int3-debug');
var p1 = dtp.addProbe('firing', 'char *');
dtp.enable();

setInterval(function () {
  p1.fire(function (p) {

jclulow

#!/usr/sbin/dtrace -qCs

#pragma D option strsize=4k

syscall::exece:entry
{
  this->index = -1;
  this->argstr = "";
  this->done = 0;
}

jclulow

jclulow@jmcbook ~ $ node -e "console.log(new Buffer('some string').toString('base64'))"
c29tZSBzdHJpbmc=
jclulow@jmcbook ~ $ node -e "console.log(new Buffer('c29tZSBzdHJpbmc=', 'base64').toString())"
some string

jclulow

diff --git a/heatmap.c b/heatmap.c
index 0423050..9afd2bd 100644
--- a/heatmap.c
+++ b/heatmap.c
@@ -78,13 +78,12 @@ print_time_markers(void)
         int offs;
 	int mark = 0;
 	char *marker = NULL;
+	char marker[100];
 

jclulow

The following diff prevents us from overrunning the buffer and corrupting the heap:

jclulow

[root@ra ~]# ./json.d 
BOOTING AT: Fri Nov 09 2012 18:00:50 GMT+0000 (UTC)
BOOTING AT: Fri Nov 09 2012 18:00:52 GMT+0000 (UTC)
BOOTING AT: Fri Nov 09 2012 18:00:53 GMT+0000 (UTC)

  THE BOOT!                                                         3
  jacob                                                            10
  jingleheimer                                                     10
  schmidt                                                          10
  john                                                             11

jclulow

[16:48:48] < CIA-52> illumos (447cd34) Daniil Lunev: 3160 nfs: 
                     OPEN_CONFIRM with non-regular file returns wrong error - 
                     http://git.io/ogL94g
[16:48:48] < CIA-52> illumos (049d03d) Vitaliy Gusev: 3162 nfs: some 
                     unusable code in nfs4_srv.c - http://git.io/zesxxQ
[16:48:48] < CIA-52> illumos (3fc1e28) Bryan Cantrill: 3210 ld should 
                     tolerate SHT_PROGBITS for .eh_frame sections on amd64 - 
                     http://git.io/Pk64_A

jclulow

#!/usr/bin/env node

var exec = require('child_process').exec;

var jobs = [
  'sleep 1',
  'sleep 2',
  'sleep 3',
  'sleep 4',
  'false',