RangeError: Index out of range

[shaikh-shahid]

Getting this error when run ops run using the vscode extension.

What could be the possible issue?

booting /home/shahidshaikh/.ops/images/node ...
�[1;33mYou specified hardware acceleration, but it is not supported
Are you running inside a vm? If so disable accel with --accel=false
�[0m
�[1;33mAnyway, we will try to enable hardware acceleration
�[0mstderr: Could not access KVM kernel module: No such file or directory
qemu-system-x86_64: failed to initialize KVM: No such file or directory
stderr: qemu-system-x86_64: Back to tcg accelerator
en1: assigned 10.0.2.15
en1: assigned FE80::18E9:80FF:FE34:7D33
buffer.js:607
slice: (buf, start, end) => buf.utf8Slice(start, end),
^

RangeError: Index out of range
at Object.slice (buffer.js:607:37)
at Buffer.toString (buffer.js:804:14)
at Object.readFileSync (fs.js:408:41)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1195:22)
at Module.load (internal/modules/cjs/loader.js:1040:32)
at Function.Module._load (internal/modules/cjs/loader.js:929:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
at internal/main/run_main_module.js:17:47 {
code: 'ERR_OUT_OF_RANGE'
}
exit status 3

[fabioDMFerreira]

@shaikh-shahid could you provide more context about your problem like the steps you followed, the environment where you're running and if possible your program source code.

[shaikh-shahid]

Hey sure,

I am using the official code.

var http = require('http');
http.createServer(function (req, res) {
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end('Hello World\n');
}).listen(8083, "0.0.0.0");
console.log('Server running at http://127.0.0.1:8083/');

I have installed ops in machine and i am using vscode ops extension to execute.

In vscode, i am opening the command palete using shift+ctrl+p and running Ops: run open file command.

and i am getting the error shown above.

Same error when i am executing it via commands.

ops pkg load node_v14.2.0 -a app.js

[eyberg]

@shaikh-shahid are you on linux / mac / windows?

what version of qemu are you using?

 qemu-system-x86_64 --version

or

 ops profile

[eyberg]

this might be from an older version of qemu nanovms/nanos#340

[shaikh-shahid]

Hey I am on Ubuntu,

ops profile results

Ops version: 0.1.22
Nanos version: 0.0
Qemu version: 2.11.1
Arch: linux
Virtualized: false

[eyberg]

yeh - that's what I expected - it's an old qemu version

what release of ubuntu was that?

cat /etc/lsb-release

I just tried on 18.04 bionic with that version though, some qemu notes -> https://github.com/nanovms/nanos/wiki/qemu

is it possible to try on a more up-to-date ubuntu or later version of qemu?

[shaikh-shahid]

I am running on 18.04

[shaikh-shahid]

Any guide to upgrade to qemu ? I tried few commands but ops profile returning the same version.

[eyberg]

https://askubuntu.com/questions/1067722/how-do-i-install-qemu-3-0-on-ubuntu-18-04 or just upgrading the distro would work too

[eyberg]

fyi -- I was able to replicate what you see on 18.04 when accel is turned off

eyberg@box:~/j$ ops pkg load node_v14.2.0 -v -p 8083 --accel=false -a hi.js
booting /home/eyberg/.ops/images/node ...
You have disabled hardware acceleration

qemu-system-x86_64 -machine q35 -device pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x3 -device pcie-root-port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x3.0x1 -device pcie-root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x3.0x2 -device virtio-scsi-pci,bus=pci.2,addr=0x0,id=scsi0 -device scsi-hd,bus=scsi0.0,drive=hd0 -vga none -smp 1 -device isa-debug-exit -m 2G -no-reboot -cpu max -drive file=/home/eyberg/.ops/images/node,format=raw,if=none,id=hd0 -device virtio-net,bus=pci.3,addr=0x0,netdev=n0,mac=aa:30:d4:9d:28:56 -netdev user,id=n0,hostfwd=tcp::8083-:8083 -display none -serial stdio
en1: assigned 10.0.2.15
en1: assigned FE80::A830:D4FF:FE9D:2856

buffer.js:607
    slice: (buf, start, end) => buf.utf8Slice(start, end),
                                    ^

RangeError: Index out of range
    at Object.slice (buffer.js:607:37)
    at Buffer.toString (buffer.js:804:14)
    at Object.readFileSync (fs.js:408:41)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1195:22)
    at Module.load (internal/modules/cjs/loader.js:1040:32)
    at Function.Module._load (internal/modules/cjs/loader.js:929:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
    at internal/main/run_main_module.js:17:47 {
  code: 'ERR_OUT_OF_RANGE'
}
exit status 3

if you have access to use kvm that might fix it as well because it works when accel is on (which is the default)

[eyberg]

if you are on real hardware you can add yourself to kvm group as well https://nanovms.gitbook.io/ops/acceleration

[shaikh-shahid]

I followed the link you gave, it seems I enabled everything. groups command is returning the kvm user group. I am just gonna switch to my MacBook and use ops there for tutorial sake. I think my company laptop has some restrictions.

[shaikh-shahid]

Working fine in my Mac. Something wrong with my Ubuntu machine. Closing the issue.