:terminal closed before output is fully consumed

[zsugabubus]

Problem

Terminal output is truncated when large amount of data is passed:

…
7785
7786
7
[Process exited 0]

Steps to reproduce

:term seq 10000

Expected behavior

…
9998
9999
10000
[Process exited 0]

Neovim version (nvim -v)

0.10.0-dev-1907abb

Vim (not Nvim) behaves the same?

no, 9.0.2143

Operating system/version

Arch Linux

Terminal name/version

alacritty

$TERM environment variable

alacritty

Installation

build from repo

[gpanders]

I am able to reproduce this on Debian, but not on macOS.

[zeertzjq]

This seems to apply to on_stdout callback of jobstart() with pty as well, although not every time:

let g:stdout = []
func OnOutput(id, data, event) dict
  let g:stdout += a:data
endfunc
call jobstart('seq 10000', {
      \ 'on_stdout': function('OnOutput'),
      \ 'pty': v:true,
      \ })

[zsugabubus]

I am able to reproduce this on Debian, but not on macOS.

I do not have a macOS at hand but maybe it has smaller pipe capacity by default so libuv can always finish reading in time. Forcing one large write instead of many smaller may help reproduction: :term stdbuf -o64K seq 10000.

[rudiejd]

This only happens when I pass the command with a large output to :term ex command, not when I run the same command in terminal.