Xml error in opening svg

[shivani]

On generating svg file using stackvis
stackvis dtrace flamegraph-svg < stacks.out > stacks.svg

I am seeing an xml error on opening the svg file in browser. Can you confirm solution for this?
The dtrace command I am using for debugging node js is:

dtrace -x aggsize=16M -x jstackstrsize=1024 -n 'profile-97 /pid==15148/ { @[jstack(100,8192)] = count(); } tick-200s {exit(0); }' > stacks.out

[davepacheco]

Are you able to post either the input file or the output file somewhere?

[shivani]

Will attach the dtrace output by tomorrow(Cannot access it now) - but attached the final generated svg file which I cannot open. http://tinyurl.com/nu9d78k

[davepacheco]

Chrome reports a bad character at line 590, column 85, and sure enough, that's a control character (value 0x06):

$ head -590 foo.svg | tail -1 | xxd
0000000: 2020 2020 3c72 6563 7420 783d 2233 352e      <rect x="35.
0000010: 3022 2079 3d22 3131 3233 2e30 2220 7769  0" y="1123.0" wi
0000020: 6474 683d 2232 2e38 2220 6865 6967 6874  dth="2.8" height
0000030: 3d22 3135 2e30 2220 6669 6c6c 3d22 7267  ="15.0" fill="rg
0000040: 6228 3232 312c 3137 372c 3135 3529 2220  b(221,177,155)" 
0000050: 7278 3d22 3222 2072 793d 2232 2220 6f6e  rx="2" ry="2" on
0000060: 6d6f 7573 656f 7665 723d 2273 2826 7175  mouseover="s(&qu
0000070: 6f74 3b28 616e 6f6e 2920 6173 2056 6965  ot;(anon) as Vie
0000080: 772e 7265 6e64 6572 2061 7420 2f06 2028  w.render at /. (
0000090: 3620 7361 6d70 6c65 732c 2030 2e32 3425  6 samples, 0.24%
00000a0: 2926 7175 6f74 3b29 2220 6f6e 6d6f 7573  )&quot;)" onmous
00000b0: 656f 7574 3d22 6328 2922 202f 3e0a       eout="c()" />.

Assuming it's present in the dtrace output as well, this would be a bug in the Node ustack helper. To debug that, it would be most valuable to get a core file of a program with this frame on the stack ("View.render"), if that's possible. Otherwise, maybe a core file of the program?

We could also update stackvis to escape such characters so that they don't break the SVG.

[shivani]

This file view.js is part of express - if you create any dummy app using express Steps given her e: http://expressjs.com/starter/generator.html and then launch any page then this file gets used to render.

Source code of this file is here: https://github.com/strongloop/express/blob/master/lib/view.js - it has the render function.

debug('render "%s"', this.path); this.engine(this.path, options, fn);

Our smart os m/c is currently unavailable - will share the dtrace output once its up.
Are there a set of characters which we can replace in the generated svg file eg the control character - and get it to work?.

[davepacheco]

The URL you posted doesn't seem to work any more, but I would imagine that if you replace the bad character on line 590, the browser will be able to render the SVG.

There's nothing obvious in that source code that's busted, so we'll probably need core files to debug why you got the bad output in the first place.

[shivani]

By increasing the jstack size the error got resolved.

dtrace -n 'profile-97/execname == "node" && arg1/{ @[jstack(150, 20048)] = count(); } tick-60s { exit(0); }' > stackFile.out