The max length of console.log output is 8275

[arthuroy]

• Version: 7.1.0
• Platform: Windows 10 1607 (Redstone) 14393.447 x64
• Subsystem: console

Using the following codes, the second console.log will be failed without any error message and the program exits; but it worked on 7.0.0.

"use strict";

// length = 8275, Array(8276) is max.
var testString = Array(8277).join('a');
console.log('length = ' + testString.length);
console.log(testString);

Reduce the array size to 8276, the program works as expected.

[vsemozhetbyt]

Can't reproduce on Windows 7 x64 with cmd or Powershell.

[arthuroy]

var testString = Array(8276).join('a');
console.log('length = ' + testString.length);
console.log(testString);
console.log('finished');

Use the codes above, the second console.log works but the third fails without any error message and the program exits.

Change to Array(8192).join('a'), the third works.

[vsemozhetbyt]

Can't reproduce as well.

[arthuroy]

Start Node.js command prompt, and execute the following command:

D:\>node -p "process.stdout.write(util.format.apply(null, [Array(8278).join('a')]))"

Nothing output, but if you change the array size to Array(8277), it works.

[vsemozhetbyt]

For me, it does print all the string even with 8278.

[sp90]

Irrelevant:
Just a shot in the Dark Can it be 32bit limit if your running on a 32bit system

[bricss]

Can confirm the same blank output on my machine.

Windows 10 RS1 x64 + Node.js 7.1.0

[ChALkeR]

Does anything change if you wait for some time before exiting? E.g. do a setTimeout(()=>{},5000) afterwards. Could be related to #6456.

[Fishrock123]

Repro'd.

As the OP said this appears in 7.1.0. It is probably tangentially related to #6456 but something else must have changed here.

I bet it was the libuv 1.10.0 upgrade...

Unfortunately I am unable to bisect on Windows so... @saghul, @cjihrig, @bnoordhuis

Edit: Adding a timeout does not help, probably not related to #6456.

[killroy42]

Does it work with the patch from issue#9542?

[NijiharaTsubasa]

I'm having the same problem on both Windows 10 build 14965 and Windows Server 2016. My app suddenly exited without displaying any error message, at where a very long string should be console.log'd, after upgraded node to 7.1.0.

@Fishrock123 @killroy42 I took some time to do the bisect and tested out the patch, libuv 1.10.0 upgrade IS the cause of the problem and the patch FIXES it.